fix(mpool): MempoolFilter returns the pending transactions#7250
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WalkthroughPending-transaction filtering now uses a subscriber-backed mempool stream, buffers hashes per filter, and drains them through the Ethereum RPC path. Handler construction passes chain id and mempool subscriber through daemon and offline-server wiring. Pubsub and stateful tests are updated to match the new hash flow. ChangesPending transaction hash flow
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Actionable comments posted: 4
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Verify each finding against current code. Fix only still-valid issues, skip the
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Inline comments:
In `@src/rpc/methods/eth/filter/mempool.rs`:
- Around line 256-258: The async test in the mempool filter flow should not rely
on a single tokio::task::yield_now() to let the fan-out task deliver the
broadcast event. Update the test around the filter subscription/drain logic in
the mempool.rs path to poll with a small timeout until both filters have
received the hash, using the existing filter/broadcast setup instead of assuming
one scheduler yield is sufficient.
- Around line 119-128: The fan-out task startup in ensure_fanout_task currently
calls tokio::spawn unconditionally, which can panic if there is no active Tokio
runtime. Update the install path that reaches ensure_fanout_task to check for a
runtime first and return an installation error instead of spawning blindly, and
make sure the caller of ensure_fanout_task propagates that Result so the
existing error handling is preserved.
In `@src/rpc/methods/eth/filter/mod.rs`:
- Around line 142-146: `EthEventHandler::new()` is wiring pending-filter RPCs to
`MpoolSubscriber::dummy()`, so `eth_newPendingTransactionFilter` never receives
mempool adds in states built from it. Update the RPC state constructors that use
pending filters, especially the snapshot/test paths in `generate_test_snapshot`
and `test_snapshot`, to pass a real `MessagePool` subscriber
(`mpool.subscriber()`) into `EthEventHandler::from_config(...)` instead of
relying on the dummy subscriber. Make sure the `EthEventHandler` and related
`RPCState` setup still use the same `EventsConfig` and chain ID, but are
connected to the live mempool bus.
In `@src/tool/subcommands/api_cmd/stateful_tests.rs`:
- Around line 1041-1044: The pending-tx assertions are still happening after
chain inclusion because wait_pending_message() continues into StateWaitMsg, so
the tests do not actually verify pre-mining mempool behavior. Update the
stateful tests to inspect the filter immediately after the first MpoolPending
observation, or split wait_pending_message() into a helper that returns once the
CID appears so the test can stop before StateWaitMsg. Apply the same fix in both
affected test sections that use wait_pending_message() and
poll_pending_filter_until().
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CHANGELOG.mdsrc/daemon/mod.rssrc/message_pool/msgpool/events.rssrc/message_pool/msgpool/mod.rssrc/message_pool/msgpool/msg_pool.rssrc/message_pool/msgpool/pending_store.rssrc/message_pool/msgpool/selection.rssrc/rpc/methods/eth.rssrc/rpc/methods/eth/filter/mempool.rssrc/rpc/methods/eth/filter/mod.rssrc/rpc/methods/eth/pubsub.rssrc/tool/offline_server/server.rssrc/tool/subcommands/api_cmd/stateful_tests.rssrc/utils/task/mod.rs
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hanabi1224
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hanabi1224
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hanabi1224
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hanabi1224
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Jul 2, 2026
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Summary by CodeRabbit
New Features
Bug Fixes
eth_newPendingTransactionFilternow reports hashes only for transactions that are actually pending in the mempool (not already executed on-chain).eth_getFilterChangesnow returns only newly observed pending tx hashes per poll, without repeating previously delivered results.