Richard Liu
6 years ago
parent
4af97e7740
commit
91ea18228f
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Contributors to log15: |
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|
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- Aaron L |
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- Alan Shreve |
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- Chris Hines |
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- Ciaran Downey |
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- Dmitry Chestnykh |
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- Evan Shaw |
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- Péter Szilágyi |
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- Trevor Gattis |
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- Vincent Vanackere |
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@ -0,0 +1,13 @@ |
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Copyright 2014 Alan Shreve |
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|
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Licensed under the Apache License, Version 2.0 (the "License"); |
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you may not use this file except in compliance with the License. |
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You may obtain a copy of the License at |
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|
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http://www.apache.org/licenses/LICENSE-2.0 |
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|
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Unless required by applicable law or agreed to in writing, software |
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distributed under the License is distributed on an "AS IS" BASIS, |
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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See the License for the specific language governing permissions and |
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limitations under the License. |
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@ -0,0 +1,77 @@ |
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 |
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|
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# log15 [](https://godoc.org/github.com/inconshreveable/log15) [](https://travis-ci.org/inconshreveable/log15) |
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|
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Package log15 provides an opinionated, simple toolkit for best-practice logging in Go (golang) that is both human and machine readable. It is modeled after the Go standard library's [`io`](http://golang.org/pkg/io/) and [`net/http`](http://golang.org/pkg/net/http/) packages and is an alternative to the standard library's [`log`](http://golang.org/pkg/log/) package. |
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|
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## Features |
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- A simple, easy-to-understand API |
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- Promotes structured logging by encouraging use of key/value pairs |
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- Child loggers which inherit and add their own private context |
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- Lazy evaluation of expensive operations |
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- Simple Handler interface allowing for construction of flexible, custom logging configurations with a tiny API. |
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- Color terminal support |
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- Built-in support for logging to files, streams, syslog, and the network |
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- Support for forking records to multiple handlers, buffering records for output, failing over from failed handler writes, + more |
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|
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## Versioning |
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The API of the master branch of log15 should always be considered unstable. If you want to rely on a stable API, |
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you must vendor the library. |
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|
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## Importing |
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|
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```go |
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import log "github.com/inconshreveable/log15" |
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``` |
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|
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## Examples |
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|
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```go |
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// all loggers can have key/value context |
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srvlog := log.New("module", "app/server") |
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// all log messages can have key/value context |
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srvlog.Warn("abnormal conn rate", "rate", curRate, "low", lowRate, "high", highRate) |
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|
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// child loggers with inherited context |
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connlog := srvlog.New("raddr", c.RemoteAddr()) |
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connlog.Info("connection open") |
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|
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// lazy evaluation |
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connlog.Debug("ping remote", "latency", log.Lazy{pingRemote}) |
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|
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// flexible configuration |
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srvlog.SetHandler(log.MultiHandler( |
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log.StreamHandler(os.Stderr, log.LogfmtFormat()), |
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log.LvlFilterHandler( |
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log.LvlError, |
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log.Must.FileHandler("errors.json", log.JSONFormat())))) |
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``` |
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|
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Will result in output that looks like this: |
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|
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``` |
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WARN[06-17|21:58:10] abnormal conn rate module=app/server rate=0.500 low=0.100 high=0.800 |
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INFO[06-17|21:58:10] connection open module=app/server raddr=10.0.0.1 |
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``` |
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|
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## Breaking API Changes |
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The following commits broke API stability. This reference is intended to help you understand the consequences of updating to a newer version |
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of log15. |
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- 57a084d014d4150152b19e4e531399a7145d1540 - Added a `Get()` method to the `Logger` interface to retrieve the current handler |
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- 93404652ee366648fa622b64d1e2b67d75a3094a - `Record` field `Call` changed to `stack.Call` with switch to `github.com/go-stack/stack` |
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- a5e7613673c73281f58e15a87d2cf0cf111e8152 - Restored `syslog.Priority` argument to the `SyslogXxx` handler constructors |
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|
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## FAQ |
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### The varargs style is brittle and error prone! Can I have type safety please? |
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Yes. Use `log.Ctx`: |
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```go |
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srvlog := log.New(log.Ctx{"module": "app/server"}) |
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srvlog.Warn("abnormal conn rate", log.Ctx{"rate": curRate, "low": lowRate, "high": highRate}) |
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``` |
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|
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## License |
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Apache |
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@ -0,0 +1,5 @@ |
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This package is a fork of https://github.com/inconshreveable/log15, with some |
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minor modifications required by the go-ethereum codebase: |
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* Support for log level `trace` |
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* Modified behavior to exit on `critical` failure |
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@ -0,0 +1,333 @@ |
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/* |
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Package log15 provides an opinionated, simple toolkit for best-practice logging that is |
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both human and machine readable. It is modeled after the standard library's io and net/http |
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packages. |
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This package enforces you to only log key/value pairs. Keys must be strings. Values may be |
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any type that you like. The default output format is logfmt, but you may also choose to use |
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JSON instead if that suits you. Here's how you log: |
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log.Info("page accessed", "path", r.URL.Path, "user_id", user.id) |
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This will output a line that looks like: |
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lvl=info t=2014-05-02T16:07:23-0700 msg="page accessed" path=/org/71/profile user_id=9 |
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Getting Started |
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To get started, you'll want to import the library: |
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import log "github.com/inconshreveable/log15" |
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Now you're ready to start logging: |
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func main() { |
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log.Info("Program starting", "args", os.Args()) |
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} |
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|
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Convention |
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|
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Because recording a human-meaningful message is common and good practice, the first argument to every |
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logging method is the value to the *implicit* key 'msg'. |
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Additionally, the level you choose for a message will be automatically added with the key 'lvl', and so |
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will the current timestamp with key 't'. |
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You may supply any additional context as a set of key/value pairs to the logging function. log15 allows |
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you to favor terseness, ordering, and speed over safety. This is a reasonable tradeoff for |
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logging functions. You don't need to explicitly state keys/values, log15 understands that they alternate |
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in the variadic argument list: |
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log.Warn("size out of bounds", "low", lowBound, "high", highBound, "val", val) |
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If you really do favor your type-safety, you may choose to pass a log.Ctx instead: |
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log.Warn("size out of bounds", log.Ctx{"low": lowBound, "high": highBound, "val": val}) |
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Context loggers |
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Frequently, you want to add context to a logger so that you can track actions associated with it. An http |
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request is a good example. You can easily create new loggers that have context that is automatically included |
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with each log line: |
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requestlogger := log.New("path", r.URL.Path) |
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// later
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requestlogger.Debug("db txn commit", "duration", txnTimer.Finish()) |
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This will output a log line that includes the path context that is attached to the logger: |
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lvl=dbug t=2014-05-02T16:07:23-0700 path=/repo/12/add_hook msg="db txn commit" duration=0.12 |
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Handlers |
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The Handler interface defines where log lines are printed to and how they are formated. Handler is a |
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single interface that is inspired by net/http's handler interface: |
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type Handler interface { |
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Log(r *Record) error |
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} |
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Handlers can filter records, format them, or dispatch to multiple other Handlers. |
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This package implements a number of Handlers for common logging patterns that are |
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easily composed to create flexible, custom logging structures. |
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Here's an example handler that prints logfmt output to Stdout: |
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handler := log.StreamHandler(os.Stdout, log.LogfmtFormat()) |
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Here's an example handler that defers to two other handlers. One handler only prints records |
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from the rpc package in logfmt to standard out. The other prints records at Error level |
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or above in JSON formatted output to the file /var/log/service.json |
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handler := log.MultiHandler( |
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log.LvlFilterHandler(log.LvlError, log.Must.FileHandler("/var/log/service.json", log.JSONFormat())), |
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log.MatchFilterHandler("pkg", "app/rpc" log.StdoutHandler()) |
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) |
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Logging File Names and Line Numbers |
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This package implements three Handlers that add debugging information to the |
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context, CallerFileHandler, CallerFuncHandler and CallerStackHandler. Here's |
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an example that adds the source file and line number of each logging call to |
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the context. |
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h := log.CallerFileHandler(log.StdoutHandler) |
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log.Root().SetHandler(h) |
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... |
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log.Error("open file", "err", err) |
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This will output a line that looks like: |
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lvl=eror t=2014-05-02T16:07:23-0700 msg="open file" err="file not found" caller=data.go:42 |
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Here's an example that logs the call stack rather than just the call site. |
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h := log.CallerStackHandler("%+v", log.StdoutHandler) |
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log.Root().SetHandler(h) |
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... |
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log.Error("open file", "err", err) |
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This will output a line that looks like: |
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lvl=eror t=2014-05-02T16:07:23-0700 msg="open file" err="file not found" stack="[pkg/data.go:42 pkg/cmd/main.go]" |
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The "%+v" format instructs the handler to include the path of the source file |
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relative to the compile time GOPATH. The github.com/go-stack/stack package |
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documents the full list of formatting verbs and modifiers available. |
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Custom Handlers |
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The Handler interface is so simple that it's also trivial to write your own. Let's create an |
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example handler which tries to write to one handler, but if that fails it falls back to |
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writing to another handler and includes the error that it encountered when trying to write |
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to the primary. This might be useful when trying to log over a network socket, but if that |
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fails you want to log those records to a file on disk. |
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type BackupHandler struct { |
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Primary Handler |
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Secondary Handler |
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} |
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func (h *BackupHandler) Log (r *Record) error { |
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err := h.Primary.Log(r) |
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if err != nil { |
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r.Ctx = append(ctx, "primary_err", err) |
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return h.Secondary.Log(r) |
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} |
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return nil |
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} |
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This pattern is so useful that a generic version that handles an arbitrary number of Handlers |
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is included as part of this library called FailoverHandler. |
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Logging Expensive Operations |
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Sometimes, you want to log values that are extremely expensive to compute, but you don't want to pay |
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the price of computing them if you haven't turned up your logging level to a high level of detail. |
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This package provides a simple type to annotate a logging operation that you want to be evaluated |
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lazily, just when it is about to be logged, so that it would not be evaluated if an upstream Handler |
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filters it out. Just wrap any function which takes no arguments with the log.Lazy type. For example: |
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func factorRSAKey() (factors []int) { |
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// return the factors of a very large number
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} |
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log.Debug("factors", log.Lazy{factorRSAKey}) |
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If this message is not logged for any reason (like logging at the Error level), then |
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factorRSAKey is never evaluated. |
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Dynamic context values |
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The same log.Lazy mechanism can be used to attach context to a logger which you want to be |
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evaluated when the message is logged, but not when the logger is created. For example, let's imagine |
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a game where you have Player objects: |
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type Player struct { |
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name string |
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alive bool |
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log.Logger |
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} |
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You always want to log a player's name and whether they're alive or dead, so when you create the player |
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object, you might do: |
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p := &Player{name: name, alive: true} |
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p.Logger = log.New("name", p.name, "alive", p.alive) |
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Only now, even after a player has died, the logger will still report they are alive because the logging |
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context is evaluated when the logger was created. By using the Lazy wrapper, we can defer the evaluation |
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of whether the player is alive or not to each log message, so that the log records will reflect the player's |
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current state no matter when the log message is written: |
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|
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p := &Player{name: name, alive: true} |
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isAlive := func() bool { return p.alive } |
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player.Logger = log.New("name", p.name, "alive", log.Lazy{isAlive}) |
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Terminal Format |
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If log15 detects that stdout is a terminal, it will configure the default |
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handler for it (which is log.StdoutHandler) to use TerminalFormat. This format |
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logs records nicely for your terminal, including color-coded output based |
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on log level. |
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Error Handling |
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Becasuse log15 allows you to step around the type system, there are a few ways you can specify |
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invalid arguments to the logging functions. You could, for example, wrap something that is not |
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a zero-argument function with log.Lazy or pass a context key that is not a string. Since logging libraries |
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are typically the mechanism by which errors are reported, it would be onerous for the logging functions |
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to return errors. Instead, log15 handles errors by making these guarantees to you: |
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- Any log record containing an error will still be printed with the error explained to you as part of the log record. |
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|
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- Any log record containing an error will include the context key LOG15_ERROR, enabling you to easily |
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(and if you like, automatically) detect if any of your logging calls are passing bad values. |
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|
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Understanding this, you might wonder why the Handler interface can return an error value in its Log method. Handlers |
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are encouraged to return errors only if they fail to write their log records out to an external source like if the |
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syslog daemon is not responding. This allows the construction of useful handlers which cope with those failures |
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like the FailoverHandler. |
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Library Use |
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log15 is intended to be useful for library authors as a way to provide configurable logging to |
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users of their library. Best practice for use in a library is to always disable all output for your logger |
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by default and to provide a public Logger instance that consumers of your library can configure. Like so: |
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package yourlib |
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import "github.com/inconshreveable/log15" |
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var Log = log.New() |
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func init() { |
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Log.SetHandler(log.DiscardHandler()) |
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} |
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Users of your library may then enable it if they like: |
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import "github.com/inconshreveable/log15" |
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import "example.com/yourlib" |
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func main() { |
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handler := // custom handler setup
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yourlib.Log.SetHandler(handler) |
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} |
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Best practices attaching logger context |
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The ability to attach context to a logger is a powerful one. Where should you do it and why? |
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I favor embedding a Logger directly into any persistent object in my application and adding |
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unique, tracing context keys to it. For instance, imagine I am writing a web browser: |
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type Tab struct { |
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url string |
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render *RenderingContext |
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// ...
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Logger |
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} |
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func NewTab(url string) *Tab { |
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return &Tab { |
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// ...
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url: url, |
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Logger: log.New("url", url), |
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} |
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} |
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When a new tab is created, I assign a logger to it with the url of |
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the tab as context so it can easily be traced through the logs. |
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Now, whenever we perform any operation with the tab, we'll log with its |
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embedded logger and it will include the tab title automatically: |
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tab.Debug("moved position", "idx", tab.idx) |
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There's only one problem. What if the tab url changes? We could |
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use log.Lazy to make sure the current url is always written, but that |
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would mean that we couldn't trace a tab's full lifetime through our |
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logs after the user navigate to a new URL. |
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|
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Instead, think about what values to attach to your loggers the |
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same way you think about what to use as a key in a SQL database schema. |
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If it's possible to use a natural key that is unique for the lifetime of the |
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object, do so. But otherwise, log15's ext package has a handy RandId |
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function to let you generate what you might call "surrogate keys" |
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They're just random hex identifiers to use for tracing. Back to our |
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Tab example, we would prefer to set up our Logger like so: |
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import logext "github.com/inconshreveable/log15/ext" |
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t := &Tab { |
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// ...
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url: url, |
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} |
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t.Logger = log.New("id", logext.RandId(8), "url", log.Lazy{t.getUrl}) |
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return t |
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Now we'll have a unique traceable identifier even across loading new urls, but |
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we'll still be able to see the tab's current url in the log messages. |
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|
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Must |
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|
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For all Handler functions which can return an error, there is a version of that |
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function which will return no error but panics on failure. They are all available |
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on the Must object. For example: |
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log.Must.FileHandler("/path", log.JSONFormat) |
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log.Must.NetHandler("tcp", ":1234", log.JSONFormat) |
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Inspiration and Credit |
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|
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All of the following excellent projects inspired the design of this library: |
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|
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code.google.com/p/log4go |
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github.com/op/go-logging |
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|
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github.com/technoweenie/grohl |
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|
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github.com/Sirupsen/logrus |
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|
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github.com/kr/logfmt |
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github.com/spacemonkeygo/spacelog |
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|
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golang's stdlib, notably io and net/http |
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|
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The Name |
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|
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https://xkcd.com/927/
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|
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*/ |
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package log |
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@ -0,0 +1,363 @@ |
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package log |
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|
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import ( |
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"bytes" |
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"encoding/json" |
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"fmt" |
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"reflect" |
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"strconv" |
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"strings" |
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"sync" |
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"sync/atomic" |
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"time" |
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"unicode/utf8" |
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) |
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|
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const ( |
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timeFormat = "2006-01-02T15:04:05-0700" |
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termTimeFormat = "01-02|15:04:05.999999" |
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floatFormat = 'f' |
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termMsgJust = 40 |
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) |
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|
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// locationTrims are trimmed for display to avoid unwieldy log lines.
|
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var locationTrims = []string{ |
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"github.com/ethereum/go-ethereum/", |
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} |
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|
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// PrintOrigins sets or unsets log location (file:line) printing for terminal
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// format output.
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func PrintOrigins(print bool) { |
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if print { |
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atomic.StoreUint32(&locationEnabled, 1) |
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} else { |
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atomic.StoreUint32(&locationEnabled, 0) |
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} |
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} |
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|
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// locationEnabled is an atomic flag controlling whether the terminal formatter
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// should append the log locations too when printing entries.
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var locationEnabled uint32 |
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// locationLength is the maxmimum path length encountered, which all logs are
|
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// padded to to aid in alignment.
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var locationLength uint32 |
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|
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// fieldPadding is a global map with maximum field value lengths seen until now
|
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// to allow padding log contexts in a bit smarter way.
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var fieldPadding = make(map[string]int) |
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|
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// fieldPaddingLock is a global mutex protecting the field padding map.
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var fieldPaddingLock sync.RWMutex |
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|
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type Format interface { |
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Format(r *Record) []byte |
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} |
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|
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// FormatFunc returns a new Format object which uses
|
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// the given function to perform record formatting.
|
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func FormatFunc(f func(*Record) []byte) Format { |
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return formatFunc(f) |
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} |
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|
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type formatFunc func(*Record) []byte |
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|
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func (f formatFunc) Format(r *Record) []byte { |
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return f(r) |
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} |
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|
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// TerminalStringer is an analogous interface to the stdlib stringer, allowing
|
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// own types to have custom shortened serialization formats when printed to the
|
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// screen.
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type TerminalStringer interface { |
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TerminalString() string |
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} |
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|
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// TerminalFormat formats log records optimized for human readability on
|
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// a terminal with color-coded level output and terser human friendly timestamp.
|
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// This format should only be used for interactive programs or while developing.
|
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//
|
||||
// [TIME] [LEVEL] MESAGE key=value key=value ...
|
||||
//
|
||||
// Example:
|
||||
//
|
||||
// [May 16 20:58:45] [DBUG] remove route ns=haproxy addr=127.0.0.1:50002
|
||||
//
|
||||
func TerminalFormat(usecolor bool) Format { |
||||
return FormatFunc(func(r *Record) []byte { |
||||
var color = 0 |
||||
if usecolor { |
||||
switch r.Lvl { |
||||
case LvlCrit: |
||||
color = 35 |
||||
case LvlError: |
||||
color = 31 |
||||
case LvlWarn: |
||||
color = 33 |
||||
case LvlInfo: |
||||
color = 32 |
||||
case LvlDebug: |
||||
color = 36 |
||||
case LvlTrace: |
||||
color = 34 |
||||
} |
||||
} |
||||
|
||||
b := &bytes.Buffer{} |
||||
lvl := r.Lvl.AlignedString() |
||||
if atomic.LoadUint32(&locationEnabled) != 0 { |
||||
// Log origin printing was requested, format the location path and line number
|
||||
location := fmt.Sprintf("%+v", r.Call) |
||||
for _, prefix := range locationTrims { |
||||
location = strings.TrimPrefix(location, prefix) |
||||
} |
||||
// Maintain the maximum location length for fancyer alignment
|
||||
align := int(atomic.LoadUint32(&locationLength)) |
||||
if align < len(location) { |
||||
align = len(location) |
||||
atomic.StoreUint32(&locationLength, uint32(align)) |
||||
} |
||||
padding := strings.Repeat(" ", align-len(location)) |
||||
|
||||
// Assemble and print the log heading
|
||||
if color > 0 { |
||||
fmt.Fprintf(b, "\x1b[%dm%s\x1b[0m[%s|%s]%s %s ", color, lvl, r.Time.Format(termTimeFormat), location, padding, r.Msg) |
||||
} else { |
||||
fmt.Fprintf(b, "%s[%s|%s]%s %s ", lvl, r.Time.Format(termTimeFormat), location, padding, r.Msg) |
||||
} |
||||
} else { |
||||
if color > 0 { |
||||
fmt.Fprintf(b, "\x1b[%dm%s\x1b[0m[%s] %s ", color, lvl, r.Time.Format(termTimeFormat), r.Msg) |
||||
} else { |
||||
fmt.Fprintf(b, "%s[%s] %s ", lvl, r.Time.Format(termTimeFormat), r.Msg) |
||||
} |
||||
} |
||||
// try to justify the log output for short messages
|
||||
length := utf8.RuneCountInString(r.Msg) |
||||
if len(r.Ctx) > 0 && length < termMsgJust { |
||||
b.Write(bytes.Repeat([]byte{' '}, termMsgJust-length)) |
||||
} |
||||
// print the keys logfmt style
|
||||
logfmt(b, r.Ctx, color, true) |
||||
return b.Bytes() |
||||
}) |
||||
} |
||||
|
||||
// LogfmtFormat prints records in logfmt format, an easy machine-parseable but human-readable
|
||||
// format for key/value pairs.
|
||||
//
|
||||
// For more details see: http://godoc.org/github.com/kr/logfmt
|
||||
//
|
||||
func LogfmtFormat() Format { |
||||
return FormatFunc(func(r *Record) []byte { |
||||
common := []interface{}{r.KeyNames.Time, r.Time, r.KeyNames.Lvl, r.Lvl, r.KeyNames.Msg, r.Msg} |
||||
buf := &bytes.Buffer{} |
||||
logfmt(buf, append(common, r.Ctx...), 0, false) |
||||
return buf.Bytes() |
||||
}) |
||||
} |
||||
|
||||
func logfmt(buf *bytes.Buffer, ctx []interface{}, color int, term bool) { |
||||
for i := 0; i < len(ctx); i += 2 { |
||||
if i != 0 { |
||||
buf.WriteByte(' ') |
||||
} |
||||
|
||||
k, ok := ctx[i].(string) |
||||
v := formatLogfmtValue(ctx[i+1], term) |
||||
if !ok { |
||||
k, v = errorKey, formatLogfmtValue(k, term) |
||||
} |
||||
|
||||
// XXX: we should probably check that all of your key bytes aren't invalid
|
||||
fieldPaddingLock.RLock() |
||||
padding := fieldPadding[k] |
||||
fieldPaddingLock.RUnlock() |
||||
|
||||
length := utf8.RuneCountInString(v) |
||||
if padding < length { |
||||
padding = length |
||||
|
||||
fieldPaddingLock.Lock() |
||||
fieldPadding[k] = padding |
||||
fieldPaddingLock.Unlock() |
||||
} |
||||
if color > 0 { |
||||
fmt.Fprintf(buf, "\x1b[%dm%s\x1b[0m=", color, k) |
||||
} else { |
||||
buf.WriteString(k) |
||||
buf.WriteByte('=') |
||||
} |
||||
buf.WriteString(v) |
||||
if i < len(ctx)-2 { |
||||
buf.Write(bytes.Repeat([]byte{' '}, padding-length)) |
||||
} |
||||
} |
||||
buf.WriteByte('\n') |
||||
} |
||||
|
||||
// JSONFormat formats log records as JSON objects separated by newlines.
|
||||
// It is the equivalent of JSONFormatEx(false, true).
|
||||
func JSONFormat() Format { |
||||
return JSONFormatEx(false, true) |
||||
} |
||||
|
||||
// JSONFormatEx formats log records as JSON objects. If pretty is true,
|
||||
// records will be pretty-printed. If lineSeparated is true, records
|
||||
// will be logged with a new line between each record.
|
||||
func JSONFormatEx(pretty, lineSeparated bool) Format { |
||||
jsonMarshal := json.Marshal |
||||
if pretty { |
||||
jsonMarshal = func(v interface{}) ([]byte, error) { |
||||
return json.MarshalIndent(v, "", " ") |
||||
} |
||||
} |
||||
|
||||
return FormatFunc(func(r *Record) []byte { |
||||
props := make(map[string]interface{}) |
||||
|
||||
props[r.KeyNames.Time] = r.Time |
||||
props[r.KeyNames.Lvl] = r.Lvl.String() |
||||
props[r.KeyNames.Msg] = r.Msg |
||||
|
||||
for i := 0; i < len(r.Ctx); i += 2 { |
||||
k, ok := r.Ctx[i].(string) |
||||
if !ok { |
||||
props[errorKey] = fmt.Sprintf("%+v is not a string key", r.Ctx[i]) |
||||
} |
||||
props[k] = formatJSONValue(r.Ctx[i+1]) |
||||
} |
||||
|
||||
b, err := jsonMarshal(props) |
||||
if err != nil { |
||||
b, _ = jsonMarshal(map[string]string{ |
||||
errorKey: err.Error(), |
||||
}) |
||||
return b |
||||
} |
||||
|
||||
if lineSeparated { |
||||
b = append(b, '\n') |
||||
} |
||||
|
||||
return b |
||||
}) |
||||
} |
||||
|
||||
func formatShared(value interface{}) (result interface{}) { |
||||
defer func() { |
||||
if err := recover(); err != nil { |
||||
if v := reflect.ValueOf(value); v.Kind() == reflect.Ptr && v.IsNil() { |
||||
result = "nil" |
||||
} else { |
||||
panic(err) |
||||
} |
||||
} |
||||
}() |
||||
|
||||
switch v := value.(type) { |
||||
case time.Time: |
||||
return v.Format(timeFormat) |
||||
|
||||
case error: |
||||
return v.Error() |
||||
|
||||
case fmt.Stringer: |
||||
return v.String() |
||||
|
||||
default: |
||||
return v |
||||
} |
||||
} |
||||
|
||||
func formatJSONValue(value interface{}) interface{} { |
||||
value = formatShared(value) |
||||
switch value.(type) { |
||||
case int, int8, int16, int32, int64, float32, float64, uint, uint8, uint16, uint32, uint64, string: |
||||
return value |
||||
default: |
||||
return fmt.Sprintf("%+v", value) |
||||
} |
||||
} |
||||
|
||||
// formatValue formats a value for serialization
|
||||
func formatLogfmtValue(value interface{}, term bool) string { |
||||
if value == nil { |
||||
return "nil" |
||||
} |
||||
|
||||
if t, ok := value.(time.Time); ok { |
||||
// Performance optimization: No need for escaping since the provided
|
||||
// timeFormat doesn't have any escape characters, and escaping is
|
||||
// expensive.
|
||||
return t.Format(timeFormat) |
||||
} |
||||
if term { |
||||
if s, ok := value.(TerminalStringer); ok { |
||||
// Custom terminal stringer provided, use that
|
||||
return escapeString(s.TerminalString()) |
||||
} |
||||
} |
||||
value = formatShared(value) |
||||
switch v := value.(type) { |
||||
case bool: |
||||
return strconv.FormatBool(v) |
||||
case float32: |
||||
return strconv.FormatFloat(float64(v), floatFormat, 3, 64) |
||||
case float64: |
||||
return strconv.FormatFloat(v, floatFormat, 3, 64) |
||||
case int, int8, int16, int32, int64, uint, uint8, uint16, uint32, uint64: |
||||
return fmt.Sprintf("%d", value) |
||||
case string: |
||||
return escapeString(v) |
||||
default: |
||||
return escapeString(fmt.Sprintf("%+v", value)) |
||||
} |
||||
} |
||||
|
||||
var stringBufPool = sync.Pool{ |
||||
New: func() interface{} { return new(bytes.Buffer) }, |
||||
} |
||||
|
||||
func escapeString(s string) string { |
||||
needsQuotes := false |
||||
needsEscape := false |
||||
for _, r := range s { |
||||
if r <= ' ' || r == '=' || r == '"' { |
||||
needsQuotes = true |
||||
} |
||||
if r == '\\' || r == '"' || r == '\n' || r == '\r' || r == '\t' { |
||||
needsEscape = true |
||||
} |
||||
} |
||||
if !needsEscape && !needsQuotes { |
||||
return s |
||||
} |
||||
e := stringBufPool.Get().(*bytes.Buffer) |
||||
e.WriteByte('"') |
||||
for _, r := range s { |
||||
switch r { |
||||
case '\\', '"': |
||||
e.WriteByte('\\') |
||||
e.WriteByte(byte(r)) |
||||
case '\n': |
||||
e.WriteString("\\n") |
||||
case '\r': |
||||
e.WriteString("\\r") |
||||
case '\t': |
||||
e.WriteString("\\t") |
||||
default: |
||||
e.WriteRune(r) |
||||
} |
||||
} |
||||
e.WriteByte('"') |
||||
var ret string |
||||
if needsQuotes { |
||||
ret = e.String() |
||||
} else { |
||||
ret = string(e.Bytes()[1 : e.Len()-1]) |
||||
} |
||||
e.Reset() |
||||
stringBufPool.Put(e) |
||||
return ret |
||||
} |
||||
@ -0,0 +1,359 @@ |
||||
package log |
||||
|
||||
import ( |
||||
"fmt" |
||||
"io" |
||||
"net" |
||||
"os" |
||||
"reflect" |
||||
"sync" |
||||
|
||||
"github.com/go-stack/stack" |
||||
) |
||||
|
||||
// Handler defines where and how log records are written.
|
||||
// A Logger prints its log records by writing to a Handler.
|
||||
// Handlers are composable, providing you great flexibility in combining
|
||||
// them to achieve the logging structure that suits your applications.
|
||||
type Handler interface { |
||||
Log(r *Record) error |
||||
} |
||||
|
||||
// FuncHandler returns a Handler that logs records with the given
|
||||
// function.
|
||||
func FuncHandler(fn func(r *Record) error) Handler { |
||||
return funcHandler(fn) |
||||
} |
||||
|
||||
type funcHandler func(r *Record) error |
||||
|
||||
func (h funcHandler) Log(r *Record) error { |
||||
return h(r) |
||||
} |
||||
|
||||
// StreamHandler writes log records to an io.Writer
|
||||
// with the given format. StreamHandler can be used
|
||||
// to easily begin writing log records to other
|
||||
// outputs.
|
||||
//
|
||||
// StreamHandler wraps itself with LazyHandler and SyncHandler
|
||||
// to evaluate Lazy objects and perform safe concurrent writes.
|
||||
func StreamHandler(wr io.Writer, fmtr Format) Handler { |
||||
h := FuncHandler(func(r *Record) error { |
||||
_, err := wr.Write(fmtr.Format(r)) |
||||
return err |
||||
}) |
||||
return LazyHandler(SyncHandler(h)) |
||||
} |
||||
|
||||
// SyncHandler can be wrapped around a handler to guarantee that
|
||||
// only a single Log operation can proceed at a time. It's necessary
|
||||
// for thread-safe concurrent writes.
|
||||
func SyncHandler(h Handler) Handler { |
||||
var mu sync.Mutex |
||||
return FuncHandler(func(r *Record) error { |
||||
defer mu.Unlock() |
||||
mu.Lock() |
||||
return h.Log(r) |
||||
}) |
||||
} |
||||
|
||||
// FileHandler returns a handler which writes log records to the give file
|
||||
// using the given format. If the path
|
||||
// already exists, FileHandler will append to the given file. If it does not,
|
||||
// FileHandler will create the file with mode 0644.
|
||||
func FileHandler(path string, fmtr Format) (Handler, error) { |
||||
f, err := os.OpenFile(path, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0644) |
||||
if err != nil { |
||||
return nil, err |
||||
} |
||||
return closingHandler{f, StreamHandler(f, fmtr)}, nil |
||||
} |
||||
|
||||
// NetHandler opens a socket to the given address and writes records
|
||||
// over the connection.
|
||||
func NetHandler(network, addr string, fmtr Format) (Handler, error) { |
||||
conn, err := net.Dial(network, addr) |
||||
if err != nil { |
||||
return nil, err |
||||
} |
||||
|
||||
return closingHandler{conn, StreamHandler(conn, fmtr)}, nil |
||||
} |
||||
|
||||
// XXX: closingHandler is essentially unused at the moment
|
||||
// it's meant for a future time when the Handler interface supports
|
||||
// a possible Close() operation
|
||||
type closingHandler struct { |
||||
io.WriteCloser |
||||
Handler |
||||
} |
||||
|
||||
func (h *closingHandler) Close() error { |
||||
return h.WriteCloser.Close() |
||||
} |
||||
|
||||
// CallerFileHandler returns a Handler that adds the line number and file of
|
||||
// the calling function to the context with key "caller".
|
||||
func CallerFileHandler(h Handler) Handler { |
||||
return FuncHandler(func(r *Record) error { |
||||
r.Ctx = append(r.Ctx, "caller", fmt.Sprint(r.Call)) |
||||
return h.Log(r) |
||||
}) |
||||
} |
||||
|
||||
// CallerFuncHandler returns a Handler that adds the calling function name to
|
||||
// the context with key "fn".
|
||||
func CallerFuncHandler(h Handler) Handler { |
||||
return FuncHandler(func(r *Record) error { |
||||
r.Ctx = append(r.Ctx, "fn", formatCall("%+n", r.Call)) |
||||
return h.Log(r) |
||||
}) |
||||
} |
||||
|
||||
// This function is here to please go vet on Go < 1.8.
|
||||
func formatCall(format string, c stack.Call) string { |
||||
return fmt.Sprintf(format, c) |
||||
} |
||||
|
||||
// CallerStackHandler returns a Handler that adds a stack trace to the context
|
||||
// with key "stack". The stack trace is formated as a space separated list of
|
||||
// call sites inside matching []'s. The most recent call site is listed first.
|
||||
// Each call site is formatted according to format. See the documentation of
|
||||
// package github.com/go-stack/stack for the list of supported formats.
|
||||
func CallerStackHandler(format string, h Handler) Handler { |
||||
return FuncHandler(func(r *Record) error { |
||||
s := stack.Trace().TrimBelow(r.Call).TrimRuntime() |
||||
if len(s) > 0 { |
||||
r.Ctx = append(r.Ctx, "stack", fmt.Sprintf(format, s)) |
||||
} |
||||
return h.Log(r) |
||||
}) |
||||
} |
||||
|
||||
// FilterHandler returns a Handler that only writes records to the
|
||||
// wrapped Handler if the given function evaluates true. For example,
|
||||
// to only log records where the 'err' key is not nil:
|
||||
//
|
||||
// logger.SetHandler(FilterHandler(func(r *Record) bool {
|
||||
// for i := 0; i < len(r.Ctx); i += 2 {
|
||||
// if r.Ctx[i] == "err" {
|
||||
// return r.Ctx[i+1] != nil
|
||||
// }
|
||||
// }
|
||||
// return false
|
||||
// }, h))
|
||||
//
|
||||
func FilterHandler(fn func(r *Record) bool, h Handler) Handler { |
||||
return FuncHandler(func(r *Record) error { |
||||
if fn(r) { |
||||
return h.Log(r) |
||||
} |
||||
return nil |
||||
}) |
||||
} |
||||
|
||||
// MatchFilterHandler returns a Handler that only writes records
|
||||
// to the wrapped Handler if the given key in the logged
|
||||
// context matches the value. For example, to only log records
|
||||
// from your ui package:
|
||||
//
|
||||
// log.MatchFilterHandler("pkg", "app/ui", log.StdoutHandler)
|
||||
//
|
||||
func MatchFilterHandler(key string, value interface{}, h Handler) Handler { |
||||
return FilterHandler(func(r *Record) (pass bool) { |
||||
switch key { |
||||
case r.KeyNames.Lvl: |
||||
return r.Lvl == value |
||||
case r.KeyNames.Time: |
||||
return r.Time == value |
||||
case r.KeyNames.Msg: |
||||
return r.Msg == value |
||||
} |
||||
|
||||
for i := 0; i < len(r.Ctx); i += 2 { |
||||
if r.Ctx[i] == key { |
||||
return r.Ctx[i+1] == value |
||||
} |
||||
} |
||||
return false |
||||
}, h) |
||||
} |
||||
|
||||
// LvlFilterHandler returns a Handler that only writes
|
||||
// records which are less than the given verbosity
|
||||
// level to the wrapped Handler. For example, to only
|
||||
// log Error/Crit records:
|
||||
//
|
||||
// log.LvlFilterHandler(log.LvlError, log.StdoutHandler)
|
||||
//
|
||||
func LvlFilterHandler(maxLvl Lvl, h Handler) Handler { |
||||
return FilterHandler(func(r *Record) (pass bool) { |
||||
return r.Lvl <= maxLvl |
||||
}, h) |
||||
} |
||||
|
||||
// MultiHandler dispatches any write to each of its handlers.
|
||||
// This is useful for writing different types of log information
|
||||
// to different locations. For example, to log to a file and
|
||||
// standard error:
|
||||
//
|
||||
// log.MultiHandler(
|
||||
// log.Must.FileHandler("/var/log/app.log", log.LogfmtFormat()),
|
||||
// log.StderrHandler)
|
||||
//
|
||||
func MultiHandler(hs ...Handler) Handler { |
||||
return FuncHandler(func(r *Record) error { |
||||
for _, h := range hs { |
||||
// what to do about failures?
|
||||
h.Log(r) |
||||
} |
||||
return nil |
||||
}) |
||||
} |
||||
|
||||
// FailoverHandler writes all log records to the first handler
|
||||
// specified, but will failover and write to the second handler if
|
||||
// the first handler has failed, and so on for all handlers specified.
|
||||
// For example you might want to log to a network socket, but failover
|
||||
// to writing to a file if the network fails, and then to
|
||||
// standard out if the file write fails:
|
||||
//
|
||||
// log.FailoverHandler(
|
||||
// log.Must.NetHandler("tcp", ":9090", log.JSONFormat()),
|
||||
// log.Must.FileHandler("/var/log/app.log", log.LogfmtFormat()),
|
||||
// log.StdoutHandler)
|
||||
//
|
||||
// All writes that do not go to the first handler will add context with keys of
|
||||
// the form "failover_err_{idx}" which explain the error encountered while
|
||||
// trying to write to the handlers before them in the list.
|
||||
func FailoverHandler(hs ...Handler) Handler { |
||||
return FuncHandler(func(r *Record) error { |
||||
var err error |
||||
for i, h := range hs { |
||||
err = h.Log(r) |
||||
if err == nil { |
||||
return nil |
||||
} |
||||
r.Ctx = append(r.Ctx, fmt.Sprintf("failover_err_%d", i), err) |
||||
} |
||||
|
||||
return err |
||||
}) |
||||
} |
||||
|
||||
// ChannelHandler writes all records to the given channel.
|
||||
// It blocks if the channel is full. Useful for async processing
|
||||
// of log messages, it's used by BufferedHandler.
|
||||
func ChannelHandler(recs chan<- *Record) Handler { |
||||
return FuncHandler(func(r *Record) error { |
||||
recs <- r |
||||
return nil |
||||
}) |
||||
} |
||||
|
||||
// BufferedHandler writes all records to a buffered
|
||||
// channel of the given size which flushes into the wrapped
|
||||
// handler whenever it is available for writing. Since these
|
||||
// writes happen asynchronously, all writes to a BufferedHandler
|
||||
// never return an error and any errors from the wrapped handler are ignored.
|
||||
func BufferedHandler(bufSize int, h Handler) Handler { |
||||
recs := make(chan *Record, bufSize) |
||||
go func() { |
||||
for m := range recs { |
||||
_ = h.Log(m) |
||||
} |
||||
}() |
||||
return ChannelHandler(recs) |
||||
} |
||||
|
||||
// LazyHandler writes all values to the wrapped handler after evaluating
|
||||
// any lazy functions in the record's context. It is already wrapped
|
||||
// around StreamHandler and SyslogHandler in this library, you'll only need
|
||||
// it if you write your own Handler.
|
||||
func LazyHandler(h Handler) Handler { |
||||
return FuncHandler(func(r *Record) error { |
||||
// go through the values (odd indices) and reassign
|
||||
// the values of any lazy fn to the result of its execution
|
||||
hadErr := false |
||||
for i := 1; i < len(r.Ctx); i += 2 { |
||||
lz, ok := r.Ctx[i].(Lazy) |
||||
if ok { |
||||
v, err := evaluateLazy(lz) |
||||
if err != nil { |
||||
hadErr = true |
||||
r.Ctx[i] = err |
||||
} else { |
||||
if cs, ok := v.(stack.CallStack); ok { |
||||
v = cs.TrimBelow(r.Call).TrimRuntime() |
||||
} |
||||
r.Ctx[i] = v |
||||
} |
||||
} |
||||
} |
||||
|
||||
if hadErr { |
||||
r.Ctx = append(r.Ctx, errorKey, "bad lazy") |
||||
} |
||||
|
||||
return h.Log(r) |
||||
}) |
||||
} |
||||
|
||||
func evaluateLazy(lz Lazy) (interface{}, error) { |
||||
t := reflect.TypeOf(lz.Fn) |
||||
|
||||
if t.Kind() != reflect.Func { |
||||
return nil, fmt.Errorf("INVALID_LAZY, not func: %+v", lz.Fn) |
||||
} |
||||
|
||||
if t.NumIn() > 0 { |
||||
return nil, fmt.Errorf("INVALID_LAZY, func takes args: %+v", lz.Fn) |
||||
} |
||||
|
||||
if t.NumOut() == 0 { |
||||
return nil, fmt.Errorf("INVALID_LAZY, no func return val: %+v", lz.Fn) |
||||
} |
||||
|
||||
value := reflect.ValueOf(lz.Fn) |
||||
results := value.Call([]reflect.Value{}) |
||||
if len(results) == 1 { |
||||
return results[0].Interface(), nil |
||||
} |
||||
values := make([]interface{}, len(results)) |
||||
for i, v := range results { |
||||
values[i] = v.Interface() |
||||
} |
||||
return values, nil |
||||
} |
||||
|
||||
// DiscardHandler reports success for all writes but does nothing.
|
||||
// It is useful for dynamically disabling logging at runtime via
|
||||
// a Logger's SetHandler method.
|
||||
func DiscardHandler() Handler { |
||||
return FuncHandler(func(r *Record) error { |
||||
return nil |
||||
}) |
||||
} |
||||
|
||||
// Must provides the following Handler creation functions
|
||||
// which instead of returning an error parameter only return a Handler
|
||||
// and panic on failure: FileHandler, NetHandler, SyslogHandler, SyslogNetHandler
|
||||
var Must muster |
||||
|
||||
func must(h Handler, err error) Handler { |
||||
if err != nil { |
||||
panic(err) |
||||
} |
||||
return h |
||||
} |
||||
|
||||
type muster struct{} |
||||
|
||||
func (m muster) FileHandler(path string, fmtr Format) Handler { |
||||
return must(FileHandler(path, fmtr)) |
||||
} |
||||
|
||||
func (m muster) NetHandler(network, addr string, fmtr Format) Handler { |
||||
return must(NetHandler(network, addr, fmtr)) |
||||
} |
||||
@ -0,0 +1,227 @@ |
||||
// Copyright 2017 The go-ethereum Authors
|
||||
// This file is part of the go-ethereum library.
|
||||
//
|
||||
// The go-ethereum library is free software: you can redistribute it and/or modify
|
||||
// it under the terms of the GNU Lesser General Public License as published by
|
||||
// the Free Software Foundation, either version 3 of the License, or
|
||||
// (at your option) any later version.
|
||||
//
|
||||
// The go-ethereum library is distributed in the hope that it will be useful,
|
||||
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
// GNU Lesser General Public License for more details.
|
||||
//
|
||||
// You should have received a copy of the GNU Lesser General Public License
|
||||
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
|
||||
|
||||
package log |
||||
|
||||
import ( |
||||
"errors" |
||||
"fmt" |
||||
"regexp" |
||||
"runtime" |
||||
"strconv" |
||||
"strings" |
||||
"sync" |
||||
"sync/atomic" |
||||
) |
||||
|
||||
// errVmoduleSyntax is returned when a user vmodule pattern is invalid.
|
||||
var errVmoduleSyntax = errors.New("expect comma-separated list of filename=N") |
||||
|
||||
// errTraceSyntax is returned when a user backtrace pattern is invalid.
|
||||
var errTraceSyntax = errors.New("expect file.go:234") |
||||
|
||||
// GlogHandler is a log handler that mimics the filtering features of Google's
|
||||
// glog logger: setting global log levels; overriding with callsite pattern
|
||||
// matches; and requesting backtraces at certain positions.
|
||||
type GlogHandler struct { |
||||
origin Handler // The origin handler this wraps
|
||||
|
||||
level uint32 // Current log level, atomically accessible
|
||||
override uint32 // Flag whether overrides are used, atomically accessible
|
||||
backtrace uint32 // Flag whether backtrace location is set
|
||||
|
||||
patterns []pattern // Current list of patterns to override with
|
||||
siteCache map[uintptr]Lvl // Cache of callsite pattern evaluations
|
||||
location string // file:line location where to do a stackdump at
|
||||
lock sync.RWMutex // Lock protecting the override pattern list
|
||||
} |
||||
|
||||
// NewGlogHandler creates a new log handler with filtering functionality similar
|
||||
// to Google's glog logger. The returned handler implements Handler.
|
||||
func NewGlogHandler(h Handler) *GlogHandler { |
||||
return &GlogHandler{ |
||||
origin: h, |
||||
} |
||||
} |
||||
|
||||
// pattern contains a filter for the Vmodule option, holding a verbosity level
|
||||
// and a file pattern to match.
|
||||
type pattern struct { |
||||
pattern *regexp.Regexp |
||||
level Lvl |
||||
} |
||||
|
||||
// Verbosity sets the glog verbosity ceiling. The verbosity of individual packages
|
||||
// and source files can be raised using Vmodule.
|
||||
func (h *GlogHandler) Verbosity(level Lvl) { |
||||
atomic.StoreUint32(&h.level, uint32(level)) |
||||
} |
||||
|
||||
// Vmodule sets the glog verbosity pattern.
|
||||
//
|
||||
// The syntax of the argument is a comma-separated list of pattern=N, where the
|
||||
// pattern is a literal file name or "glob" pattern matching and N is a V level.
|
||||
//
|
||||
// For instance:
|
||||
//
|
||||
// pattern="gopher.go=3"
|
||||
// sets the V level to 3 in all Go files named "gopher.go"
|
||||
//
|
||||
// pattern="foo=3"
|
||||
// sets V to 3 in all files of any packages whose import path ends in "foo"
|
||||
//
|
||||
// pattern="foo/*=3"
|
||||
// sets V to 3 in all files of any packages whose import path contains "foo"
|
||||
func (h *GlogHandler) Vmodule(ruleset string) error { |
||||
var filter []pattern |
||||
for _, rule := range strings.Split(ruleset, ",") { |
||||
// Empty strings such as from a trailing comma can be ignored
|
||||
if len(rule) == 0 { |
||||
continue |
||||
} |
||||
// Ensure we have a pattern = level filter rule
|
||||
parts := strings.Split(rule, "=") |
||||
if len(parts) != 2 { |
||||
return errVmoduleSyntax |
||||
} |
||||
parts[0] = strings.TrimSpace(parts[0]) |
||||
parts[1] = strings.TrimSpace(parts[1]) |
||||
if len(parts[0]) == 0 || len(parts[1]) == 0 { |
||||
return errVmoduleSyntax |
||||
} |
||||
// Parse the level and if correct, assemble the filter rule
|
||||
level, err := strconv.Atoi(parts[1]) |
||||
if err != nil { |
||||
return errVmoduleSyntax |
||||
} |
||||
if level <= 0 { |
||||
continue // Ignore. It's harmless but no point in paying the overhead.
|
||||
} |
||||
// Compile the rule pattern into a regular expression
|
||||
matcher := ".*" |
||||
for _, comp := range strings.Split(parts[0], "/") { |
||||
if comp == "*" { |
||||
matcher += "(/.*)?" |
||||
} else if comp != "" { |
||||
matcher += "/" + regexp.QuoteMeta(comp) |
||||
} |
||||
} |
||||
if !strings.HasSuffix(parts[0], ".go") { |
||||
matcher += "/[^/]+\\.go" |
||||
} |
||||
matcher = matcher + "$" |
||||
|
||||
re, _ := regexp.Compile(matcher) |
||||
filter = append(filter, pattern{re, Lvl(level)}) |
||||
} |
||||
// Swap out the vmodule pattern for the new filter system
|
||||
h.lock.Lock() |
||||
defer h.lock.Unlock() |
||||
|
||||
h.patterns = filter |
||||
h.siteCache = make(map[uintptr]Lvl) |
||||
atomic.StoreUint32(&h.override, uint32(len(filter))) |
||||
|
||||
return nil |
||||
} |
||||
|
||||
// BacktraceAt sets the glog backtrace location. When set to a file and line
|
||||
// number holding a logging statement, a stack trace will be written to the Info
|
||||
// log whenever execution hits that statement.
|
||||
//
|
||||
// Unlike with Vmodule, the ".go" must be present.
|
||||
func (h *GlogHandler) BacktraceAt(location string) error { |
||||
// Ensure the backtrace location contains two non-empty elements
|
||||
parts := strings.Split(location, ":") |
||||
if len(parts) != 2 { |
||||
return errTraceSyntax |
||||
} |
||||
parts[0] = strings.TrimSpace(parts[0]) |
||||
parts[1] = strings.TrimSpace(parts[1]) |
||||
if len(parts[0]) == 0 || len(parts[1]) == 0 { |
||||
return errTraceSyntax |
||||
} |
||||
// Ensure the .go prefix is present and the line is valid
|
||||
if !strings.HasSuffix(parts[0], ".go") { |
||||
return errTraceSyntax |
||||
} |
||||
if _, err := strconv.Atoi(parts[1]); err != nil { |
||||
return errTraceSyntax |
||||
} |
||||
// All seems valid
|
||||
h.lock.Lock() |
||||
defer h.lock.Unlock() |
||||
|
||||
h.location = location |
||||
atomic.StoreUint32(&h.backtrace, uint32(len(location))) |
||||
|
||||
return nil |
||||
} |
||||
|
||||
// Log implements Handler.Log, filtering a log record through the global, local
|
||||
// and backtrace filters, finally emitting it if either allow it through.
|
||||
func (h *GlogHandler) Log(r *Record) error { |
||||
// If backtracing is requested, check whether this is the callsite
|
||||
if atomic.LoadUint32(&h.backtrace) > 0 { |
||||
// Everything below here is slow. Although we could cache the call sites the
|
||||
// same way as for vmodule, backtracing is so rare it's not worth the extra
|
||||
// complexity.
|
||||
h.lock.RLock() |
||||
match := h.location == r.Call.String() |
||||
h.lock.RUnlock() |
||||
|
||||
if match { |
||||
// Callsite matched, raise the log level to info and gather the stacks
|
||||
r.Lvl = LvlInfo |
||||
|
||||
buf := make([]byte, 1024*1024) |
||||
buf = buf[:runtime.Stack(buf, true)] |
||||
r.Msg += "\n\n" + string(buf) |
||||
} |
||||
} |
||||
// If the global log level allows, fast track logging
|
||||
if atomic.LoadUint32(&h.level) >= uint32(r.Lvl) { |
||||
return h.origin.Log(r) |
||||
} |
||||
// If no local overrides are present, fast track skipping
|
||||
if atomic.LoadUint32(&h.override) == 0 { |
||||
return nil |
||||
} |
||||
// Check callsite cache for previously calculated log levels
|
||||
h.lock.RLock() |
||||
lvl, ok := h.siteCache[r.Call.PC()] |
||||
h.lock.RUnlock() |
||||
|
||||
// If we didn't cache the callsite yet, calculate it
|
||||
if !ok { |
||||
h.lock.Lock() |
||||
for _, rule := range h.patterns { |
||||
if rule.pattern.MatchString(fmt.Sprintf("%+s", r.Call)) { |
||||
h.siteCache[r.Call.PC()], lvl, ok = rule.level, rule.level, true |
||||
break |
||||
} |
||||
} |
||||
// If no rule matched, remember to drop log the next time
|
||||
if !ok { |
||||
h.siteCache[r.Call.PC()] = 0 |
||||
} |
||||
h.lock.Unlock() |
||||
} |
||||
if lvl >= r.Lvl { |
||||
return h.origin.Log(r) |
||||
} |
||||
return nil |
||||
} |
||||
@ -0,0 +1,26 @@ |
||||
// +build !go1.4
|
||||
|
||||
package log |
||||
|
||||
import ( |
||||
"sync/atomic" |
||||
"unsafe" |
||||
) |
||||
|
||||
// swapHandler wraps another handler that may be swapped out
|
||||
// dynamically at runtime in a thread-safe fashion.
|
||||
type swapHandler struct { |
||||
handler unsafe.Pointer |
||||
} |
||||
|
||||
func (h *swapHandler) Log(r *Record) error { |
||||
return h.Get().Log(r) |
||||
} |
||||
|
||||
func (h *swapHandler) Get() Handler { |
||||
return *(*Handler)(atomic.LoadPointer(&h.handler)) |
||||
} |
||||
|
||||
func (h *swapHandler) Swap(newHandler Handler) { |
||||
atomic.StorePointer(&h.handler, unsafe.Pointer(&newHandler)) |
||||
} |
||||
@ -0,0 +1,23 @@ |
||||
// +build go1.4
|
||||
|
||||
package log |
||||
|
||||
import "sync/atomic" |
||||
|
||||
// swapHandler wraps another handler that may be swapped out
|
||||
// dynamically at runtime in a thread-safe fashion.
|
||||
type swapHandler struct { |
||||
handler atomic.Value |
||||
} |
||||
|
||||
func (h *swapHandler) Log(r *Record) error { |
||||
return (*h.handler.Load().(*Handler)).Log(r) |
||||
} |
||||
|
||||
func (h *swapHandler) Swap(newHandler Handler) { |
||||
h.handler.Store(&newHandler) |
||||
} |
||||
|
||||
func (h *swapHandler) Get() Handler { |
||||
return *h.handler.Load().(*Handler) |
||||
} |
||||
@ -0,0 +1,242 @@ |
||||
package log |
||||
|
||||
import ( |
||||
"fmt" |
||||
"os" |
||||
"time" |
||||
|
||||
"github.com/go-stack/stack" |
||||
) |
||||
|
||||
const timeKey = "t" |
||||
const lvlKey = "lvl" |
||||
const msgKey = "msg" |
||||
const errorKey = "LOG15_ERROR" |
||||
const skipLevel = 2 |
||||
|
||||
type Lvl int |
||||
|
||||
const ( |
||||
LvlCrit Lvl = iota |
||||
LvlError |
||||
LvlWarn |
||||
LvlInfo |
||||
LvlDebug |
||||
LvlTrace |
||||
) |
||||
|
||||
// AlignedString returns a 5-character string containing the name of a Lvl.
|
||||
func (l Lvl) AlignedString() string { |
||||
switch l { |
||||
case LvlTrace: |
||||
return "TRACE" |
||||
case LvlDebug: |
||||
return "DEBUG" |
||||
case LvlInfo: |
||||
return "INFO " |
||||
case LvlWarn: |
||||
return "WARN " |
||||
case LvlError: |
||||
return "ERROR" |
||||
case LvlCrit: |
||||
return "CRIT " |
||||
default: |
||||
panic("bad level") |
||||
} |
||||
} |
||||
|
||||
// Strings returns the name of a Lvl.
|
||||
func (l Lvl) String() string { |
||||
switch l { |
||||
case LvlTrace: |
||||
return "trce" |
||||
case LvlDebug: |
||||
return "dbug" |
||||
case LvlInfo: |
||||
return "info" |
||||
case LvlWarn: |
||||
return "warn" |
||||
case LvlError: |
||||
return "eror" |
||||
case LvlCrit: |
||||
return "crit" |
||||
default: |
||||
panic("bad level") |
||||
} |
||||
} |
||||
|
||||
// LvlFromString returns the appropriate Lvl from a string name.
|
||||
// Useful for parsing command line args and configuration files.
|
||||
func LvlFromString(lvlString string) (Lvl, error) { |
||||
switch lvlString { |
||||
case "trace", "trce": |
||||
return LvlTrace, nil |
||||
case "debug", "dbug": |
||||
return LvlDebug, nil |
||||
case "info": |
||||
return LvlInfo, nil |
||||
case "warn": |
||||
return LvlWarn, nil |
||||
case "error", "eror": |
||||
return LvlError, nil |
||||
case "crit": |
||||
return LvlCrit, nil |
||||
default: |
||||
return LvlDebug, fmt.Errorf("Unknown level: %v", lvlString) |
||||
} |
||||
} |
||||
|
||||
// A Record is what a Logger asks its handler to write
|
||||
type Record struct { |
||||
Time time.Time |
||||
Lvl Lvl |
||||
Msg string |
||||
Ctx []interface{} |
||||
Call stack.Call |
||||
KeyNames RecordKeyNames |
||||
} |
||||
|
||||
// RecordKeyNames gets stored in a Record when the write function is executed.
|
||||
type RecordKeyNames struct { |
||||
Time string |
||||
Msg string |
||||
Lvl string |
||||
} |
||||
|
||||
// A Logger writes key/value pairs to a Handler
|
||||
type Logger interface { |
||||
// New returns a new Logger that has this logger's context plus the given context
|
||||
New(ctx ...interface{}) Logger |
||||
|
||||
// GetHandler gets the handler associated with the logger.
|
||||
GetHandler() Handler |
||||
|
||||
// SetHandler updates the logger to write records to the specified handler.
|
||||
SetHandler(h Handler) |
||||
|
||||
// Log a message at the given level with context key/value pairs
|
||||
Trace(msg string, ctx ...interface{}) |
||||
Debug(msg string, ctx ...interface{}) |
||||
Info(msg string, ctx ...interface{}) |
||||
Warn(msg string, ctx ...interface{}) |
||||
Error(msg string, ctx ...interface{}) |
||||
Crit(msg string, ctx ...interface{}) |
||||
} |
||||
|
||||
type logger struct { |
||||
ctx []interface{} |
||||
h *swapHandler |
||||
} |
||||
|
||||
func (l *logger) write(msg string, lvl Lvl, ctx []interface{}, skip int) { |
||||
l.h.Log(&Record{ |
||||
Time: time.Now(), |
||||
Lvl: lvl, |
||||
Msg: msg, |
||||
Ctx: newContext(l.ctx, ctx), |
||||
Call: stack.Caller(skip), |
||||
KeyNames: RecordKeyNames{ |
||||
Time: timeKey, |
||||
Msg: msgKey, |
||||
Lvl: lvlKey, |
||||
}, |
||||
}) |
||||
} |
||||
|
||||
func (l *logger) New(ctx ...interface{}) Logger { |
||||
child := &logger{newContext(l.ctx, ctx), new(swapHandler)} |
||||
child.SetHandler(l.h) |
||||
return child |
||||
} |
||||
|
||||
func newContext(prefix []interface{}, suffix []interface{}) []interface{} { |
||||
normalizedSuffix := normalize(suffix) |
||||
newCtx := make([]interface{}, len(prefix)+len(normalizedSuffix)) |
||||
n := copy(newCtx, prefix) |
||||
copy(newCtx[n:], normalizedSuffix) |
||||
return newCtx |
||||
} |
||||
|
||||
func (l *logger) Trace(msg string, ctx ...interface{}) { |
||||
l.write(msg, LvlTrace, ctx, skipLevel) |
||||
} |
||||
|
||||
func (l *logger) Debug(msg string, ctx ...interface{}) { |
||||
l.write(msg, LvlDebug, ctx, skipLevel) |
||||
} |
||||
|
||||
func (l *logger) Info(msg string, ctx ...interface{}) { |
||||
l.write(msg, LvlInfo, ctx, skipLevel) |
||||
} |
||||
|
||||
func (l *logger) Warn(msg string, ctx ...interface{}) { |
||||
l.write(msg, LvlWarn, ctx, skipLevel) |
||||
} |
||||
|
||||
func (l *logger) Error(msg string, ctx ...interface{}) { |
||||
l.write(msg, LvlError, ctx, skipLevel) |
||||
} |
||||
|
||||
func (l *logger) Crit(msg string, ctx ...interface{}) { |
||||
l.write(msg, LvlCrit, ctx, skipLevel) |
||||
os.Exit(1) |
||||
} |
||||
|
||||
func (l *logger) GetHandler() Handler { |
||||
return l.h.Get() |
||||
} |
||||
|
||||
func (l *logger) SetHandler(h Handler) { |
||||
l.h.Swap(h) |
||||
} |
||||
|
||||
func normalize(ctx []interface{}) []interface{} { |
||||
// if the caller passed a Ctx object, then expand it
|
||||
if len(ctx) == 1 { |
||||
if ctxMap, ok := ctx[0].(Ctx); ok { |
||||
ctx = ctxMap.toArray() |
||||
} |
||||
} |
||||
|
||||
// ctx needs to be even because it's a series of key/value pairs
|
||||
// no one wants to check for errors on logging functions,
|
||||
// so instead of erroring on bad input, we'll just make sure
|
||||
// that things are the right length and users can fix bugs
|
||||
// when they see the output looks wrong
|
||||
if len(ctx)%2 != 0 { |
||||
ctx = append(ctx, nil, errorKey, "Normalized odd number of arguments by adding nil") |
||||
} |
||||
|
||||
return ctx |
||||
} |
||||
|
||||
// Lazy allows you to defer calculation of a logged value that is expensive
|
||||
// to compute until it is certain that it must be evaluated with the given filters.
|
||||
//
|
||||
// Lazy may also be used in conjunction with a Logger's New() function
|
||||
// to generate a child logger which always reports the current value of changing
|
||||
// state.
|
||||
//
|
||||
// You may wrap any function which takes no arguments to Lazy. It may return any
|
||||
// number of values of any type.
|
||||
type Lazy struct { |
||||
Fn interface{} |
||||
} |
||||
|
||||
// Ctx is a map of key/value pairs to pass as context to a log function
|
||||
// Use this only if you really need greater safety around the arguments you pass
|
||||
// to the logging functions.
|
||||
type Ctx map[string]interface{} |
||||
|
||||
func (c Ctx) toArray() []interface{} { |
||||
arr := make([]interface{}, len(c)*2) |
||||
|
||||
i := 0 |
||||
for k, v := range c { |
||||
arr[i] = k |
||||
arr[i+1] = v |
||||
i += 2 |
||||
} |
||||
|
||||
return arr |
||||
} |
||||
@ -0,0 +1,70 @@ |
||||
package log |
||||
|
||||
import ( |
||||
"os" |
||||
) |
||||
|
||||
var ( |
||||
root = &logger{[]interface{}{}, new(swapHandler)} |
||||
StdoutHandler = StreamHandler(os.Stdout, LogfmtFormat()) |
||||
StderrHandler = StreamHandler(os.Stderr, LogfmtFormat()) |
||||
) |
||||
|
||||
func init() { |
||||
root.SetHandler(DiscardHandler()) |
||||
} |
||||
|
||||
// New returns a new logger with the given context.
|
||||
// New is a convenient alias for Root().New
|
||||
func New(ctx ...interface{}) Logger { |
||||
return root.New(ctx...) |
||||
} |
||||
|
||||
// Root returns the root logger
|
||||
func Root() Logger { |
||||
return root |
||||
} |
||||
|
||||
// The following functions bypass the exported logger methods (logger.Debug,
|
||||
// etc.) to keep the call depth the same for all paths to logger.write so
|
||||
// runtime.Caller(2) always refers to the call site in client code.
|
||||
|
||||
// Trace is a convenient alias for Root().Trace
|
||||
func Trace(msg string, ctx ...interface{}) { |
||||
root.write(msg, LvlTrace, ctx, skipLevel) |
||||
} |
||||
|
||||
// Debug is a convenient alias for Root().Debug
|
||||
func Debug(msg string, ctx ...interface{}) { |
||||
root.write(msg, LvlDebug, ctx, skipLevel) |
||||
} |
||||
|
||||
// Info is a convenient alias for Root().Info
|
||||
func Info(msg string, ctx ...interface{}) { |
||||
root.write(msg, LvlInfo, ctx, skipLevel) |
||||
} |
||||
|
||||
// Warn is a convenient alias for Root().Warn
|
||||
func Warn(msg string, ctx ...interface{}) { |
||||
root.write(msg, LvlWarn, ctx, skipLevel) |
||||
} |
||||
|
||||
// Error is a convenient alias for Root().Error
|
||||
func Error(msg string, ctx ...interface{}) { |
||||
root.write(msg, LvlError, ctx, skipLevel) |
||||
} |
||||
|
||||
// Crit is a convenient alias for Root().Crit
|
||||
func Crit(msg string, ctx ...interface{}) { |
||||
root.write(msg, LvlCrit, ctx, skipLevel) |
||||
os.Exit(1) |
||||
} |
||||
|
||||
// Output is a convenient alias for write, allowing for the modification of
|
||||
// the calldepth (number of stack frames to skip).
|
||||
// calldepth influences the reported line number of the log message.
|
||||
// A calldepth of zero reports the immediate caller of Output.
|
||||
// Non-zero calldepth skips as many stack frames.
|
||||
func Output(msg string, lvl Lvl, calldepth int, ctx ...interface{}) { |
||||
root.write(msg, lvl, ctx, calldepth+skipLevel) |
||||
} |
||||
@ -0,0 +1,57 @@ |
||||
// +build !windows,!plan9
|
||||
|
||||
package log |
||||
|
||||
import ( |
||||
"log/syslog" |
||||
"strings" |
||||
) |
||||
|
||||
// SyslogHandler opens a connection to the system syslog daemon by calling
|
||||
// syslog.New and writes all records to it.
|
||||
func SyslogHandler(priority syslog.Priority, tag string, fmtr Format) (Handler, error) { |
||||
wr, err := syslog.New(priority, tag) |
||||
return sharedSyslog(fmtr, wr, err) |
||||
} |
||||
|
||||
// SyslogNetHandler opens a connection to a log daemon over the network and writes
|
||||
// all log records to it.
|
||||
func SyslogNetHandler(net, addr string, priority syslog.Priority, tag string, fmtr Format) (Handler, error) { |
||||
wr, err := syslog.Dial(net, addr, priority, tag) |
||||
return sharedSyslog(fmtr, wr, err) |
||||
} |
||||
|
||||
func sharedSyslog(fmtr Format, sysWr *syslog.Writer, err error) (Handler, error) { |
||||
if err != nil { |
||||
return nil, err |
||||
} |
||||
h := FuncHandler(func(r *Record) error { |
||||
var syslogFn = sysWr.Info |
||||
switch r.Lvl { |
||||
case LvlCrit: |
||||
syslogFn = sysWr.Crit |
||||
case LvlError: |
||||
syslogFn = sysWr.Err |
||||
case LvlWarn: |
||||
syslogFn = sysWr.Warning |
||||
case LvlInfo: |
||||
syslogFn = sysWr.Info |
||||
case LvlDebug: |
||||
syslogFn = sysWr.Debug |
||||
case LvlTrace: |
||||
syslogFn = func(m string) error { return nil } // There's no syslog level for trace
|
||||
} |
||||
|
||||
s := strings.TrimSpace(string(fmtr.Format(r))) |
||||
return syslogFn(s) |
||||
}) |
||||
return LazyHandler(&closingHandler{sysWr, h}), nil |
||||
} |
||||
|
||||
func (m muster) SyslogHandler(priority syslog.Priority, tag string, fmtr Format) Handler { |
||||
return must(SyslogHandler(priority, tag, fmtr)) |
||||
} |
||||
|
||||
func (m muster) SyslogNetHandler(net, addr string, priority syslog.Priority, tag string, fmtr Format) Handler { |
||||
return must(SyslogNetHandler(net, addr, priority, tag, fmtr)) |
||||
} |
||||
@ -0,0 +1,21 @@ |
||||
The MIT License (MIT) |
||||
|
||||
Copyright (c) 2014 Simon Eskildsen |
||||
|
||||
Permission is hereby granted, free of charge, to any person obtaining a copy |
||||
of this software and associated documentation files (the "Software"), to deal |
||||
in the Software without restriction, including without limitation the rights |
||||
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
||||
copies of the Software, and to permit persons to whom the Software is |
||||
furnished to do so, subject to the following conditions: |
||||
|
||||
The above copyright notice and this permission notice shall be included in |
||||
all copies or substantial portions of the Software. |
||||
|
||||
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
||||
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
||||
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
||||
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
||||
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
||||
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
||||
THE SOFTWARE. |
||||
@ -0,0 +1,13 @@ |
||||
// Based on ssh/terminal:
|
||||
// Copyright 2013 The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
// +build appengine
|
||||
|
||||
package term |
||||
|
||||
// IsTty always returns false on AppEngine.
|
||||
func IsTty(fd uintptr) bool { |
||||
return false |
||||
} |
||||
@ -0,0 +1,13 @@ |
||||
// Based on ssh/terminal:
|
||||
// Copyright 2013 The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
// +build !appengine
|
||||
|
||||
package term |
||||
|
||||
import "syscall" |
||||
|
||||
const ioctlReadTermios = syscall.TIOCGETA |
||||
|
||||
type Termios syscall.Termios |
||||
@ -0,0 +1,18 @@ |
||||
package term |
||||
|
||||
import ( |
||||
"syscall" |
||||
) |
||||
|
||||
const ioctlReadTermios = syscall.TIOCGETA |
||||
|
||||
// Go 1.2 doesn't include Termios for FreeBSD. This should be added in 1.3 and this could be merged with terminal_darwin.
|
||||
type Termios struct { |
||||
Iflag uint32 |
||||
Oflag uint32 |
||||
Cflag uint32 |
||||
Lflag uint32 |
||||
Cc [20]uint8 |
||||
Ispeed uint32 |
||||
Ospeed uint32 |
||||
} |
||||
@ -0,0 +1,14 @@ |
||||
// Based on ssh/terminal:
|
||||
// Copyright 2013 The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
// +build !appengine
|
||||
|
||||
package term |
||||
|
||||
import "syscall" |
||||
|
||||
const ioctlReadTermios = syscall.TCGETS |
||||
|
||||
type Termios syscall.Termios |
||||
@ -0,0 +1,7 @@ |
||||
package term |
||||
|
||||
import "syscall" |
||||
|
||||
const ioctlReadTermios = syscall.TIOCGETA |
||||
|
||||
type Termios syscall.Termios |
||||
@ -0,0 +1,20 @@ |
||||
// Based on ssh/terminal:
|
||||
// Copyright 2011 The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
// +build linux,!appengine darwin freebsd openbsd netbsd
|
||||
|
||||
package term |
||||
|
||||
import ( |
||||
"syscall" |
||||
"unsafe" |
||||
) |
||||
|
||||
// IsTty returns true if the given file descriptor is a terminal.
|
||||
func IsTty(fd uintptr) bool { |
||||
var termios Termios |
||||
_, _, err := syscall.Syscall6(syscall.SYS_IOCTL, fd, ioctlReadTermios, uintptr(unsafe.Pointer(&termios)), 0, 0, 0) |
||||
return err == 0 |
||||
} |
||||
@ -0,0 +1,7 @@ |
||||
package term |
||||
|
||||
import "syscall" |
||||
|
||||
const ioctlReadTermios = syscall.TIOCGETA |
||||
|
||||
type Termios syscall.Termios |
||||
@ -0,0 +1,9 @@ |
||||
package term |
||||
|
||||
import "golang.org/x/sys/unix" |
||||
|
||||
// IsTty returns true if the given file descriptor is a terminal.
|
||||
func IsTty(fd uintptr) bool { |
||||
_, err := unix.IoctlGetTermios(int(fd), unix.TCGETA) |
||||
return err == nil |
||||
} |
||||
@ -0,0 +1,26 @@ |
||||
// Based on ssh/terminal:
|
||||
// Copyright 2011 The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
// +build windows
|
||||
|
||||
package term |
||||
|
||||
import ( |
||||
"syscall" |
||||
"unsafe" |
||||
) |
||||
|
||||
var kernel32 = syscall.NewLazyDLL("kernel32.dll") |
||||
|
||||
var ( |
||||
procGetConsoleMode = kernel32.NewProc("GetConsoleMode") |
||||
) |
||||
|
||||
// IsTty returns true if the given file descriptor is a terminal.
|
||||
func IsTty(fd uintptr) bool { |
||||
var st uint32 |
||||
r, _, e := syscall.Syscall(procGetConsoleMode.Addr(), 2, fd, uintptr(unsafe.Pointer(&st)), 0) |
||||
return r != 0 && e == 0 |
||||
} |
||||
Loading…
Reference in new issue