blockscout/apps/ethereum_jsonrpc/README.md

# EthereumJSONRPC

Ethereum JSONRPC client.

## Configuration

Configuration for parity URLs can be provided with the following mix
config:

```elixir
config :ethereum_jsonrpc,
  url: "https://sokol.poa.network",
  trace_url: "https://sokol-trace.poa.network",
  http: [recv_timeout: 60_000, timeout: 60_000, hackney: [pool: :ethereum_jsonrpc]]
```

Note: the tracing node URL is provided separately from `:url`,
via `:trace_url`. The trace URL and is used for
`fetch_internal_transactions`, which is only a supported method on
tracing nodes. The `:http` option is passed directly to the HTTP
library (`HTTPoison`), which forwards the options down to `:hackney`.

## Testing

By default, [`mox`](https://github.com/plataformatec/mox) will be used to mock the `EthereumJSONRPC.Transport` and `EthereumJSONRPC.HTTP` behaviours.  They mocked behaviours returns differ based on the `EthereumJSONRPC.Variant`.

| `EthereumJSONRPC.Variant` | `EthereumJSONRPC.Transport` | `EthereumJSONRPC.HTTP`           | `url`                                             | Command                                                                                                                                                                                                                                                  | Usage(s)                                           |
|:--------------------------|:----------------------------|:---------------------------------|:--------------------------------------------------|:---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|:---------------------------------------------------|
| `EthereumJSONRPC.Parity`  | `EthereumJSONRPC.Mox`       | `EthereumJSONRPC.HTTP.Mox`       | N/A                                               | `mix test`                                                                                                                                                                                                                                               | Local, `circleci/config.yml` `test_parity_mox` job |
| `EthereumJSONRPC.Parity`  | `EthereumJSONRPC.HTTP`      | `EthereumJSONRPC.HTTP.HTTPoison` | `https://trace-sokol.poa.network`                 | `ETHEREUM_JSONRPC_VARIANT=EthereumJSONRPC.Parity ETHEREUM_JSONRPC_TRANSPORT=EthereumJSONRPC.HTTP ETHEREUM_JSONRPC_HTTP=EthereumJSONRPC.HTTP.HTTPoison ETHEREUM_JSONRPC_HTTP_URL=https://sokol-trace.poa.network mix test --exclude no_parity`            | `.circleci/config.yml` `test_parity_http` job      |
| `EthereumJSONRPC.Geth`    | `EthereumJSONRPC.Mox`       | `EthereumJSONRPC.HTTP.Mox`       | N/A                                               | `ETHEREUM_JSONRPC_VARIANT=EthereumJSONRPC.Geth mix test --exclude no_geth`                                                                                                                                                                               | `.circleci/config.yml` `test_geth_http` job        |
| `EthereumJSONRPC.Geth`    | `EthereumJSONRPC.HTTP`      | `EthereumJSONRPC.HTTP.HTTPoison` | `https://mainnet.infura.io/8lTvJTKmHPCHazkneJsY`  | `ETHEREUM_JSONRPC_VARIANT=EthereumJSONRPC.Geth ETHEREUM_JSONRPC_TRANSPORT=EthereumJSONRPC.HTTP ETHEREUM_JSONRPC_HTTP=EthereumJSONRPC.HTTP.HTTPoison ETHEREUM_JSONRPC_HTTP_URL=https://mainnet.infura.io/8lTvJTKmHPCHazkneJsY mix test --exclude no_geth` | `.circleci/config.yml` `test_geth_http` job        |

## Installation

The OTP application `:ethereum_jsonrpc` can be used in other umbrella
OTP applications by adding `ethereum_jsonrpc` to your list of
dependencies in `mix.exs`:

```elixir
def deps do
  [
    {:ethereum_jsonrpc, in_umbrella: true}
  ]
end
```