* Add Holešky testnet network name
Signed-off-by: Fabio Di Fabio <fabio.difabio@consensys.net>
* CHANGELOG
Signed-off-by: Fabio Di Fabio <fabio.difabio@consensys.net>
* Add a fake KZG setup since Holesky define Cancun as future fork
Signed-off-by: Fabio Di Fabio <fabio.difabio@consensys.net>
* Tear down KZG trusted setup after each test
Signed-off-by: Fabio Di Fabio <fabio.difabio@consensys.net>
* Fix test
Signed-off-by: Fabio Di Fabio <fabio.difabio@consensys.net>
* Prevent another trusted setup already loaded error during tests
Signed-off-by: Fabio Di Fabio <fabio.difabio@consensys.net>
---------
Signed-off-by: Fabio Di Fabio <fabio.difabio@consensys.net>
Co-authored-by: Sally MacFarlane <macfarla.github@gmail.com>
* Trigger `OperationTracer` on contexts enter & exit
Signed-off-by: Franklin Delehelle <franklin.delehelle@odena.eu>
* Update CHANGELOG.md
Signed-off-by: Franklin Delehelle <franklin.delehelle@odena.eu>
* Spotless
Signed-off-by: Franklin Delehelle <franklin.delehelle@odena.eu>
* Daniel's comments
Signed-off-by: Franklin Delehelle <franklin.delehelle@odena.eu>
* Ensure `OperationTracer` is not null before calling it
Signed-off-by: Franklin Delehelle <franklin.delehelle@odena.eu>
* Move back hook calls into `process`
Signed-off-by: Franklin Delehelle <franklin.delehelle@odena.eu>
* Fix @shemnon comments
Signed-off-by: Franklin Delehelle <franklin.delehelle@odena.eu>
* added test for context enter and context exit
Signed-off-by: Daniel Lehrner <daniel.lehrner@consensys.net>
* spotless
Signed-off-by: Daniel Lehrner <daniel.lehrner@consensys.net>
* Trigger `OperationTracer` on contexts enter & exit
Signed-off-by: Franklin Delehelle <franklin.delehelle@odena.eu>
* Update CHANGELOG.md
Signed-off-by: Franklin Delehelle <franklin.delehelle@odena.eu>
* Spotless
Signed-off-by: Franklin Delehelle <franklin.delehelle@odena.eu>
* Daniel's comments
Signed-off-by: Franklin Delehelle <franklin.delehelle@odena.eu>
* Ensure `OperationTracer` is not null before calling it
Signed-off-by: Franklin Delehelle <franklin.delehelle@odena.eu>
* Move back hook calls into `process`
Signed-off-by: Franklin Delehelle <franklin.delehelle@odena.eu>
* Fix @shemnon comments
Signed-off-by: Franklin Delehelle <franklin.delehelle@odena.eu>
* added test for context enter and context exit
Signed-off-by: Daniel Lehrner <daniel.lehrner@consensys.net>
* spotless
Signed-off-by: Daniel Lehrner <daniel.lehrner@consensys.net>
* added a test without mocking
Signed-off-by: Daniel Lehrner <daniel.lehrner@consensys.net>
* fixed unit tests
Signed-off-by: Daniel Lehrner <daniel.lehrner@consensys.net>
---------
Signed-off-by: Franklin Delehelle <franklin.delehelle@odena.eu>
Signed-off-by: Daniel Lehrner <daniel.lehrner@consensys.net>
Co-authored-by: Daniel Lehrner <daniel.lehrner@consensys.net>
* added missing methods to transaction interface, created new AccessListEntry interface to add it to the transaction interface
Signed-off-by: Daniel Lehrner <daniel.lehrner@consensys.net>
* CHANGELOG.md entry
Signed-off-by: Daniel Lehrner <daniel.lehrner@consensys.net>
* added missing javadoc entry
Signed-off-by: Daniel Lehrner <daniel.lehrner@consensys.net>
* Update datatypes/src/main/java/org/hyperledger/besu/datatypes/Transaction.java
Co-authored-by: Sally MacFarlane <macfarla.github@gmail.com>
Signed-off-by: Daniel Lehrner <daniel.lehrner@consensys.net>
* Update datatypes/src/main/java/org/hyperledger/besu/datatypes/Transaction.java
Co-authored-by: Sally MacFarlane <macfarla.github@gmail.com>
Signed-off-by: Daniel Lehrner <daniel.lehrner@consensys.net>
* Make smart contract permissioning features work with london fork (#5727)
* Make smart contract permissioning features work with london fork
Override the transactionSimulator's default TransactionValidationParams with one that allows for exceeding the account balance (which effectively zeros the baseFee).
This mimics the way that eth_estimateGas and eth_call are implemented.
Similar change to #5277
Update ATs to use londonBlock (existing genesis allocs necessitate zeroBaseFee as well)
Signed-off-by: Simon Dudley <simon.dudley@consensys.net>
* changelog
Signed-off-by: Simon Dudley <simon.dudley@consensys.net>
---------
Signed-off-by: Simon Dudley <simon.dudley@consensys.net>
Signed-off-by: Daniel Lehrner <daniel.lehrner@consensys.net>
* Correctly cache the TransactionValidator instance on creation (#5726)
Signed-off-by: Fabio Di Fabio <fabio.difabio@consensys.net>
Signed-off-by: Daniel Lehrner <daniel.lehrner@consensys.net>
* Reference tests 12.3 (#5733)
Update Reference Tests to 12.3
* fix decoding error
* add ignored field
* update module
Signed-off-by: Danno Ferrin <danno.ferrin@swirldslabs.com>
Signed-off-by: Daniel Lehrner <daniel.lehrner@consensys.net>
* Return all not selected transactions, not only invalid ones. (#5711)
This way it is possible for the caller to have more data about the selection
process.
Signed-off-by: Fabio Di Fabio <fabio.difabio@consensys.net>
Signed-off-by: Daniel Lehrner <daniel.lehrner@consensys.net>
* Address import performance issues (#5734)
* ensure we are on a single tuweni version
* factor out an unneeded concatenate
Signed-off-by: Danno Ferrin <danno.ferrin@swirldslabs.com>
Signed-off-by: Daniel Lehrner <daniel.lehrner@consensys.net>
* Add type to PendingTransactionDetail (#5729)
* add type
* update changelog
---------
Signed-off-by: George Tebrean <george@web3labs.com>
Co-authored-by: Sally MacFarlane <macfarla.github@gmail.com>
Signed-off-by: Daniel Lehrner <daniel.lehrner@consensys.net>
* Migrate to blobGas in execution-spec-tests (#5745)
Execution-spec-tests migrated from DataGas to BlobGas and checks for its
inclusion in tests now. Add needed support.
Signed-off-by: Danno Ferrin <danno.ferrin@swirldslabs.com>
Signed-off-by: Daniel Lehrner <daniel.lehrner@consensys.net>
* remove AccessListEntry interface and move its class to the datatypes module
Signed-off-by: Daniel Lehrner <daniel.lehrner@consensys.net>
* add missing cost methods to interface, add method to get RLP of transaction
Signed-off-by: Daniel Lehrner <daniel.lehrner@consensys.net>
* updating hash with updated reference tests
Signed-off-by: Daniel Lehrner <daniel.lehrner@consensys.net>
* added missing javadocs
Signed-off-by: Daniel Lehrner <daniel.lehrner@consensys.net>
* fixed compiler errors in integration tests
Signed-off-by: Daniel Lehrner <daniel.lehrner@consensys.net>
* retro blobGas name change into Transaction interface
Signed-off-by: garyschulte <garyschulte@gmail.com>
* removed methods from transaction interface which values can be derived through other means. Added new method encoded to return the encoded tx in Bytes instead of RLPOutput
Signed-off-by: Daniel Lehrner <daniel.lehrner@consensys.net>
---------
Signed-off-by: Daniel Lehrner <daniel.lehrner@consensys.net>
Signed-off-by: Simon Dudley <simon.dudley@consensys.net>
Signed-off-by: Fabio Di Fabio <fabio.difabio@consensys.net>
Signed-off-by: Danno Ferrin <danno.ferrin@swirldslabs.com>
Signed-off-by: George Tebrean <george@web3labs.com>
Signed-off-by: garyschulte <garyschulte@gmail.com>
Co-authored-by: Sally MacFarlane <macfarla.github@gmail.com>
Co-authored-by: Simon Dudley <simon.dudley@consensys.net>
Co-authored-by: Fabio Di Fabio <fabio.difabio@consensys.net>
Co-authored-by: Danno Ferrin <danno.ferrin@swirldslabs.com>
Co-authored-by: George Tebrean <99179176+gtebrean@users.noreply.github.com>
Co-authored-by: garyschulte <garyschulte@gmail.com>
* Make the `MessageFrame.isWarm(...)` method family public
Signed-off-by: Franklin Delehelle <franklin.delehelle@odena.eu>
---------
Signed-off-by: Franklin Delehelle <franklin.delehelle@odena.eu>
Co-authored-by: matkt <karim.t2am@gmail.com>
Co-authored-by: Sally MacFarlane <macfarla.github@gmail.com>
* EvmTool fixes
A mixed collection of EVMTool fixes
* Ensure ECDSA algo is pre-configured
* used clamped math in an old gas calculator
* use correct gas calculator in fluent APIs
Signed-off-by: Danno Ferrin <danno.ferrin@swirldslabs.com>
* spotless
Signed-off-by: Danno Ferrin <danno.ferrin@swirldslabs.com>
---------
Signed-off-by: Danno Ferrin <danno.ferrin@swirldslabs.com>
* Call Operation performance improvements
- Move values that are the same or shared across the transaction to
TxValues record
- Move warm and cold storage to undoable sets and tables.
- Move transient storage to undoable table.
- Move address hashing inside of address with a memoized field.
- lazy create EOF return stack
Signed-off-by: Danno Ferrin <danno.ferrin@swirldslabs.com>
Add two new fields to reference tests (versionedHashes, maxFeePerDataGas)
Rename DataHash to BlobHash (to align with EIP4844 text)
Signed-off-by: Danno Ferrin <danno.ferrin@swirldslabs.com>
* Implements EIP-4844.
* introduces a Hardfork class to the protocol schedule system
* new Engine APIs required for CL to work on 4844
* new DataGas type for tracking block cost for 4844 data
* new VersionedHash type to reflect that a versioned hash is not quite a pure sha256
* incorporates wrapped jc-kzg library for KZG point evaluations
* New transaction type, and domain objects for constituent parts to represent the Blobs, KZGCommitments, and Proofs used for 4844
* RLP encoders and decoders to support new transaction type
* gas pricing calculators for the new type of gas
* plugin-api version was changed
Signed-off-by: Justin Florentine <justin+github@florentine.us>
Co-authored-by: Jiri Peinlich <jiri.peinlich@gmail.com>
Co-authored-by: Jason Frame <jason.frame@consensys.net>
Co-authored-by: garyschulte <garyschulte@gmail.com>
Co-authored-by: Fabio Di Fabio <fabio.difabio@consensys.net>
Co-authored-by: Sally MacFarlane <macfarla.github@gmail.com>
Co-authored-by: Gabriel Fukushima <gabrielfukushima@gmail.com>
Co-authored-by: Gabriel-Trintinalia <gabriel.trintinalia@consensys.net>
Co-authored-by: Stefan <stefan.pingel@consensys.net>
Co-authored-by: spencer-tb <spencer@spencertaylorbrown.uk>
* junit5 updates
Signed-off-by: Justin Florentine <justin+github@florentine.us>
* update t8n test
Cancun gas claculator was inheriting from london, should have been shanghai.
Signed-off-by: Danno Ferrin <danno.ferrin@swirldslabs.com>
---------
Signed-off-by: Justin Florentine <justin+github@florentine.us>
Signed-off-by: Danno Ferrin <danno.ferrin@swirldslabs.com>
Co-authored-by: Jiri Peinlich <jiri.peinlich@gmail.com>
Co-authored-by: Jason Frame <jason.frame@consensys.net>
Co-authored-by: garyschulte <garyschulte@gmail.com>
Co-authored-by: Fabio Di Fabio <fabio.difabio@consensys.net>
Co-authored-by: Sally MacFarlane <macfarla.github@gmail.com>
Co-authored-by: Gabriel Fukushima <gabrielfukushima@gmail.com>
Co-authored-by: Gabriel-Trintinalia <gabriel.trintinalia@consensys.net>
Co-authored-by: Stefan <stefan.pingel@consensys.net>
Co-authored-by: spencer-tb <spencer@spencertaylorbrown.uk>
Co-authored-by: Danno Ferrin <danno.ferrin@swirldslabs.com>
* track CREATE/CREATE2/create-tx in a new "creates" field in the MessageFrame
* re-wrote Self-Destruct logic for clarity and optional EIP-6780 semantics.
Signed-off-by: Danno Ferrin <danno.ferrin@swirldslabs.com>
* Extend OperationTracer with new methods, create
Signed-off-by: Daniel Lehrner <daniel.lehrner@consensys.net>
* Rename ExtendedOperationTracer to BlockAwareOperationTracer
Signed-off-by: Daniel Lehrner <daniel.lehrner@consensys.net>
* fixed plugin api hash
Signed-off-by: Daniel Lehrner <daniel.lehrner@consensys.net>
* added missing javadoc comments
Signed-off-by: Daniel Lehrner <daniel.lehrner@consensys.net>
* Update evm/src/main/java/org/hyperledger/besu/evm/tracing/OperationTracer.java
Co-authored-by: Sally MacFarlane <macfarla.github@gmail.com>
Signed-off-by: Daniel Lehrner <daniel.lehrner@consensys.net>
* Only update peer with the first and last block (#5659)
* only update peer with the first and last block
Signed-off-by: Stefan <stefan.pingel@consensys.net>
Signed-off-by: Daniel Lehrner <daniel.lehrner@consensys.net>
* Put download links into CHANGELOG and do some clean up (#5660)
* put the download links for 23.4.4 into the CHANGELOG.md
* clean up CHANGELOG
Signed-off-by: Stefan <stefan.pingel@consensys.net>
Signed-off-by: Daniel Lehrner <daniel.lehrner@consensys.net>
* Add --amend to docker manifest create to fix docker latest tag (#5661)
We need to replace previous release's latest tag. Might be broken due to a recent change in the docker command implementation
Signed-off-by: Simon Dudley <simon.dudley@consensys.net>
Signed-off-by: Daniel Lehrner <daniel.lehrner@consensys.net>
* Add Xlayered-tx-pool to the config log printout (#5665)
Unrelated: clarify epoch length in javadoc
Signed-off-by: Simon Dudley <simon.dudley@consensys.net>
Co-authored-by: Gabriel Fukushima <gabrielfukushima@gmail.com>
Signed-off-by: Daniel Lehrner <daniel.lehrner@consensys.net>
* Add hooks to AbstractCreateOperation for library users (#5656)
Add hooks for a successful contract create, a failed contract create,
and an invalid contact create. Users of the library will be able to
customize create responses without having to replace core logic.
Signed-off-by: Danno Ferrin <danno.ferrin@swirldslabs.com>
Signed-off-by: Daniel Lehrner <daniel.lehrner@consensys.net>
* Test updates for cancun execution-spec-tests (#5670)
- support legacy V values (larger V value) and type 1+ (v is recId only)
- new fields
- shared transaction extraction
- rejection detection
Signed-off-by: Danno Ferrin <danno.ferrin@swirldslabs.com>
Signed-off-by: Daniel Lehrner <daniel.lehrner@consensys.net>
* Upgrade BouncyCastle libraries (#5675)
Upgrade bouncy castle to v1.75. This involved a change in maven
coordinates for other modules.
Signed-off-by: Danno Ferrin <danno.ferrin@swirldslabs.com>
Signed-off-by: Daniel Lehrner <daniel.lehrner@consensys.net>
* Introduce transaction validator interface (phase 1) (#5673)
Signed-off-by: Fabio Di Fabio <fabio.difabio@consensys.net>
Signed-off-by: Daniel Lehrner <daniel.lehrner@consensys.net>
* Only validate `--miner-enabled` option for ethash networks (#5669)
* Modify the min-gas-price option validation
* Check for whether ethash is in use, either from genesis or network config, and use that for miner checks
* Add genesis configuration isPoa() convenience function
---------
Signed-off-by: Matthew Whitehead <matthew1001@gmail.com>
Signed-off-by: Matt Whitehead <matthew1001@hotmail.com>
Co-authored-by: Simon Dudley <simon.dudley@consensys.net>
Signed-off-by: Simon Dudley <simon.dudley@consensys.net>
Signed-off-by: Daniel Lehrner <daniel.lehrner@consensys.net>
* Update tuweni2.4.2 (#5684)
* Revert "Revert "Update Tuweni to 2.4.1 (#5513)" (#5585)"
This reverts commit 6111e1bbc3.
Signed-off-by: Antoine Toulme <antoine@lunar-ocean.com>
* update Tuweni to 2.4.2
Signed-off-by: Antoine Toulme <antoine@lunar-ocean.com>
---------
Signed-off-by: Antoine Toulme <antoine@lunar-ocean.com>
Signed-off-by: Daniel Lehrner <daniel.lehrner@consensys.net>
* Do not leak references to PendingTransactions (#5693)
Signed-off-by: Fabio Di Fabio <fabio.difabio@consensys.net>
Signed-off-by: Daniel Lehrner <daniel.lehrner@consensys.net>
* remove v0 version of the database (#5698)
Signed-off-by: Karim TAAM <karim.t2am@gmail.com>
Signed-off-by: Daniel Lehrner <daniel.lehrner@consensys.net>
* updated plugin api hash
Signed-off-by: Daniel Lehrner <daniel.lehrner@consensys.net>
* spotless
Signed-off-by: Daniel Lehrner <daniel.lehrner@consensys.net>
* updating plugin api hash
Signed-off-by: Daniel Lehrner <daniel.lehrner@consensys.net>
* moved transcation interface to datatypes to use it in the OperationTracer.traceStartTransaction method
Signed-off-by: Daniel Lehrner <daniel.lehrner@consensys.net>
* fix import
Signed-off-by: Daniel Lehrner <daniel.lehrner@consensys.net>
---------
Signed-off-by: Daniel Lehrner <daniel.lehrner@consensys.net>
Signed-off-by: Stefan <stefan.pingel@consensys.net>
Signed-off-by: Simon Dudley <simon.dudley@consensys.net>
Signed-off-by: Danno Ferrin <danno.ferrin@swirldslabs.com>
Signed-off-by: Fabio Di Fabio <fabio.difabio@consensys.net>
Signed-off-by: Matthew Whitehead <matthew1001@gmail.com>
Signed-off-by: Matt Whitehead <matthew1001@hotmail.com>
Signed-off-by: Antoine Toulme <antoine@lunar-ocean.com>
Signed-off-by: Karim TAAM <karim.t2am@gmail.com>
Co-authored-by: Sally MacFarlane <macfarla.github@gmail.com>
Co-authored-by: Stefan Pingel <16143240+pinges@users.noreply.github.com>
Co-authored-by: Simon Dudley <simon.dudley@consensys.net>
Co-authored-by: Gabriel Fukushima <gabrielfukushima@gmail.com>
Co-authored-by: Danno Ferrin <danno.ferrin@gmail.com>
Co-authored-by: Fabio Di Fabio <fabio.difabio@consensys.net>
Co-authored-by: Matt Whitehead <matthew1001@gmail.com>
Co-authored-by: Antoine Toulme <antoine@lunar-ocean.com>
Co-authored-by: matkt <karim.t2am@gmail.com>
Add hooks for a successful contract create, a failed contract create,
and an invalid contact create. Users of the library will be able to
customize create responses without having to replace core logic.
Signed-off-by: Danno Ferrin <danno.ferrin@swirldslabs.com>
* add new class to reflection config
* move CLI output to be system-err oriented
* make logger in evmtool nop
* exclude some problematic jars from compilation
- mixed versions of bouncy castle
- netty initializations of log4j
* Standardize JSON ObjectMapper Construction
* Add some manual mappings
* Directly instantiate crypto algorithms where appropriate
Signed-off-by: Danno Ferrin <danno.ferrin@swirldslabs.com>
BLS12 signatures were speculatively added in cancun in late 2022. This
is no longer accurate. Move the implementation to the "Future_EIPs"
fork so that it will remain testable and not accidentally get included
accidentally. Also add missing fluent APIs.
Signed-off-by: Danno Ferrin <danno.ferrin@swirldslabs.com>
Updates needed to keep executing execution-spec-tests
* add withdrawals support
* add access lists to transactions
* accept t8n and b11r CLI args that are zero length or all whitespace
* Enumerate forks in t8n and b11r help
* remove JSON wrapping from t8n transaction RLP
Signed-off-by: Danno Ferrin <danno.ferrin@swirldslabs.com>
As per a recent EIP update the opcode numbers for Transient Storage
have been updated. EOF opcodes were also updated.
Update the code and test cases for the new numbers.
Signed-off-by: Danno Ferrin <danno.ferrin@swirldslabs.com>
* update to 2.4.1
* update use of DNS daemon with Vertx
* fix issue with Bytes.repeat
* update antlr version
* fix dns tests
Signed-off-by: Antoine Toulme <antoine@lunar-ocean.com>
---------
Signed-off-by: Antoine Toulme <antoine@lunar-ocean.com>
Co-authored-by: Sally MacFarlane <macfarla.github@gmail.com>
Add the MCOPY operation targeting cancun.
Adding EVM memory to the text fixture so memory ops can be tested better.
Signed-off-by: Danno Ferrin <danno.ferrin@swirldslabs.com>
Move the implementation of "big" eof into Future EIPs, out of cancun.
Also, create space for Prague, Osaka, and Bogota forks in the EVM code.
Signed-off-by: Danno Ferrin <danno.ferrin@swirldslabs.com>
Performance improvements
- Reduce the use of UInt256 in operations, replacing them with Bytes as
appropriate.
- Use Java17 expression switch
Signed-off-by: Danno Ferrin <danno.ferrin@swirldslabs.com>
Refactor crypto, datatypes, and plugin-api to reduce plugin APIs in the EVM.
Split crypto into crypto services and crypto algorithms
Reverse the dependency between datatyps and plugin-api.
Remove plugin Hash and Address types (use datatypes)
Move PublicKey and Quantity into datatypes.
Lots of changes to imports and build files, and some fromPlugin calls removed.
Signed-off-by: Danno Ferrin <danno.ferrin@swirldslabs.com>
Signed-off-by: Danno Ferrin <danno.ferrin@shemnon.com>
Co-authored-by: Justin Florentine <justin+github@florentine.us>
Changes and config to support using GraalVM AOT to compile and
execute evmTool as an alternate configuration.
While not as long-term performant the startup time
makes filling reference tests with Besu reasonable.
Signed-off-by: Danno Ferrin <danno.ferrin@swirldslabs.com>
Fix a formatting error in standard trace that produced non-parsable
JSON. Add unit tests to cover those cases.
Signed-off-by: Danno Ferrin <danno.ferrin@swirldslabs.com>
Adding the t8n and b11r tool allows Hyperledger besu to produce reference
tests from the https://github.com/ethereum/execution-spec-tests repository.
* Add t8n tool, or transition tool. Calculates the state changes from a set
of transactions against a given parent context
* Add b11r tool, or block-builder tool. Given block parts it can generate a
RLP block.
* Change some tracing CLI flags to work better with retesteth
Signed-off-by: Danno Ferrin <danno.ferrin@swirldslabs.com>
Speedup initcode validation by
- optimizing the jumpdest loop
- not caching initcode in the code cache
(but keep codecache for normal contracts).
Signed-off-by: Danno Ferrin <danno.ferrin@swirldslabs.com>
Add the BLS curve precompiles into the registry for cancun. All of the
curve precompiles have been here since berlin, so this is just wiring
them in.
Signed-off-by: Danno Ferrin <danno.ferrin@swirldslabs.com>
Co-authored-by: Sally MacFarlane <macfarla.github@gmail.com>
Add enforcement of the rule that EOF cannot create prior versions or
legacy EVM code contracts in create opcodes and create transactions.
Signed-off-by: Danno Ferrin <danno.ferrin@swirldslabs.com>
- Added missing javadocs so that javadoc doclint passes against JDK 17 (invoke by Besu gradle build).
- Exclude following packages from javadoc lint:
org.hyperledger.besu.privacy.contracts.generated
org.hyperledger.besu.tests.acceptance.*
- Temporarily exclude ethereum and evm submodule for doc lint checks.
- Run the javadoc task using GitHub actions (use Java 17) to report any javadoc errors during the PR builds
- Updating plugin-api build.gradle with new hash as javadoc comments caused it to change
Signed-off-by: Usman Saleem <usman@usmans.info>
Danno Ferrin
Fabio Di Fabio
delehef
Stefan Pingel
Daniel Lehrner
Justin Florentine
Antoine Toulme
Danno Ferrin
Sally MacFarlane
Cody Born
Jason Frame
Gabriel-Trintinalia
garyschulte
Usman Saleem