feat(mev): add eth_sendBundle rate limit option - #224
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Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Ef5HwDcHb2r5EhaYbjhFEc
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What
Add an optional per-client rate limit for
eth_sendBundlerequests inpkg/mev, and size it for the Ultrasound builder.Why
Ultrasound caps the
eth_sendBundlerate per endpoint at 50 requests per second. A client over the limit should fail the call at once instead of queuing, because a late bundle has no value.Changes
WithSendBundleRateLimit(requestsPerSecond, burst)inpkg/mev/bundle_sender_options.go, backed bygolang.org/x/time/rate.Limiter.postBundleinpkg/mev/bundle_sender.gochecks the limiter only forETHSendBundleMethodand returns the newErrSendBundleRateLimited(pkg/mev/errors.go) when no token is free.UltrasoundSendBundleRPSandUltrasoundSendBundleBurstconstants inpkg/mev/constants.go, both 50, one limit per Ultrasound endpoint.go.mod:golang.org/x/timemoves from indirect to direct.pkg/mev/bundle_sender_rate_limit_test.go: 5 tests for the burst limit, that onlyeth_sendBundleis limited, the unlimited default, a non-positive limit, and the Ultrasound constant values.Test plan
go build ./...go test ./pkg/mev/...(new tests pass)golangci-lint run --config=.golangci.yml ./pkg/mev/...(only pre-existing issues, unrelated to this change)go mod tidy(no further change)🤖 Generated with Claude Code
https://claude.ai/code/session_01Ef5HwDcHb2r5EhaYbjhFEc