feat: add WebSocket transaction streamer service#5
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New binary that streams transaction events over WebSocket connections. Polls accountsdb and indexer databases, broadcasts escrow and withdraw events to connected clients. Adds axum and tower-http workspace deps.
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May 21, 2026
* fix(gateway): add 64KB request body size limit Gateway read unbounded POST bodies into memory, risking OOM under large payloads. Two-layer defense: - Content-Length pre-check: reject >64KB with 413 before reading bytes - Limited wrapper: enforces cap for chunked/missing Content-Length Error downcast distinguishes LengthLimitError (413) from genuine IO errors (400) so error semantics stay correct. Unparseable Content-Length headers are logged as warnings. 413 responses include a JSON-RPC error body with the limit for client debuggability. Includes five tests: oversized Content-Length, oversized chunked body, exact 64KB boundary, lying Content-Length bypass, and normal request passthrough. Refs: PRO-890 * refactor(gateway): move start_test_gateway into mod tests --------- Co-authored-by: Jo D <dev-jodee@users.noreply.github.com>
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Summary
streamerbinary incore/src/bin/streamer.rsthat provides real-time WebSocket streaming of escrow and withdrawal transaction events.axum(withwsfeature) andtower-http(withcorsfeature) as workspace dependencies.Changed files
Cargo.toml-- workspace deps foraxumandtower-httpCargo.lock-- dependency resolutioncore/Cargo.toml-- addaxumandtower-httpcore/src/bin/streamer.rs-- 759-line streamer serviceTest plan
cargo build -p contra-core --bin streamercompilesMade with Cursor