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CHANGELOG.md

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Changelog

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

Note: this file did not exist until after v0.5.6.

0.10.0 - 2026-04-20

  • (rpc): accept eth denominations (e.g. "1 eth") for min_balance (#518)
  • report now includes total/successful/failed transaction counts with failure rate (#519)
  • core logs: replaced "SIMULATING SETUP COST" banners with tracing spans (#520)
  • errors are now also saved to the DB when not collecting receipts (#511)
  • improve campaign/spam logs (particularly when --report is passed) (#508)
  • refactored Contender orchestrator to a typestate-based lifecycle — Contender<Uninitialized> vs Contender<Initialized> — eliminating all runtime lifecycle checks and enforcing correct usage at compile time (#507)
  • custom spam callbacks can now wrap a LogCallback via LogCallback::with_callback to inherit the tx-caching and FCU behavior that contender report depends on, removing the boilerplate that previously caused custom callbacks to silently break reporting (#326)
  • added contender server + some supporting (and internally-breaking) changes (#494)

0.9.1 - 2026-04-01

  • support spamming with eth_sendRawTransactionSync with new flag --send-raw-tx-sync (#459)
  • auto-fund spammer accounts periodically when running with --forever to prevent ETH depletion (#502)
  • add --time-to-inclusion-bucket flag to configure histogram bucket size in reports (#498)
  • move default data dir to $XDG_STATE_HOME/contender (~/.local/state/contender), with automatic migration from legacy ~/.contender (#460)
  • organize --help output into logical sections for spam and campaign flags (#408)
  • bugfix: only retry recoverable errors in init_scenario (within spam), allow CTRL-C to terminate it (#503)
  • harden against RPC failures (#496)
  • add live spam progress report logs, enabled with --report-interval (#493)

0.9.0 - 2026-03-17

  • added --send-raw-tx-sync flag to spam and campaign for eth_sendRawTransactionSync support (#459)
  • limit concurrent funding tasks to 25 (#451)
  • added contender version to bottom of reports (#452)
  • enable custom data dir at runtime (453)
  • clean up html report UI, support batched eth_sendRawTransaction latency metrics (#455)
  • added --scenario-label flag to deploy and spam the same scenario under different labels (#456)
  • fix: generate report when --gen-report is passed to spam (#457)
  • control SETUP_CONCURRENCY_LIMIT with env var (#461)
  • add gas quantiles to report (#464)
  • add support for flashblocks time-to-inclusion collection & --flashblocks-ws-url (#465)
  • added contender rpc subcommand for spam-testing arbitrary JSON-RPC methods with latency tracking and HTML report generation (#468)

0.8.1 - 2026-02-09

  • bugfix: fixed internal default erc20 args, made TimedSpammer output more regular (#443)
  • bugfix: limit concurrent setup tasks to prevent FD exhaustion (#447)

0.8.0 - 2026-02-02

  • track nonces internally for create & setup transactions (#438)
  • bugfix: tolerate failure of get_block_receipts (#438)

Breaking changes

  • removed --redeploy, no longer skips contract deployments if previously deployed (#438)
  • breaking changes in contender_core (see core changelog for details)

0.7.4 - 2026-01-27

  • revised campaign spammer (#427)

0.7.3 - 2026-01-20

  • transactions that revert onchain now store error as "execution reverted" DB, rather than NULL (#418)
  • added --infinite flag to campaigns; loops campaigns indefinitely (#420)
  • added --accounts-per-agent flag to setup, fix campaign seeds (#425)
  • improved --min-balance warning log formatting (#421)
  • lock-free TxActor & non-blocking tx-sending (#423)

0.7.2 - 2026-01-14

  • bugfix: deploy contracts before attempting to estimate spam cost (#416)

0.7.1 - 2026-01-09

  • --timeout flag from contender spam is deprecated, will be removed in a future release
  • added contender admin contract-address command (#412)
  • fixed funding-tx collision bug triggered by campaigns (#413)

0.7.0 - 2026-01-05

  • setup txs are now sent asynchronously (#390)
  • added campaigns: meta-scenario config files (#389)
  • scenario files now support units in value field (#388)
  • tx cache is now processed async & independent of spammer (#396)
  • spam gas price can now be locked manually with --gas-price (#400)
  • CLI logs are now less verbose (#406)

Potentially breaking:

  • --loops [num] has been replaced with --forever (bool)

0.6.0 - 2025-11-25

Features:

  • more env var support (#376)
  • --skip-setup flag, minor UX improvements (#377)
  • scenarios: add groth16Verify scenario to test onchain proof verification (#379)
  • spammer: support batching json-rpc eth_sendRawTransaction reqs (#381)
  • minor UX improvements (#382)
  • campaign meta-scenarios: new contender campaign command and campaign TOML schema for staged parallel mixes

Internal changes:

  • revamp error handling (#378)
  • DB schema bumped to user_version = 6 to record campaign/stage metadata in runs.
    • If you see a DB version mismatch, export/reset your DB: contender db export (optional backup) then contender db reset (or drop) to recreate with the new schema.