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pthmas
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* feat: add SSE for live block updates Add Server-Sent Events endpoint (GET /api/events) that streams new blocks to the frontend in real-time, replacing polling for block height and blocks list updates. Backend: - New SSE handler polls DB every 200ms, emits one event per block in order - SSE route excluded from 10s TimeoutLayer so connections stay alive - Nginx configured to proxy SSE with buffering disabled Frontend: - useBlockSSE hook buffers events in a ref-based queue and drains at the chain's natural block rate (computed from on-chain timestamps) - Navbar counter updates instantly via SSE, block time derived from 30s rolling window of block timestamps for stability - BlocksPage prepends new blocks from SSE on page 1 with auto-refresh - Polling falls back automatically when SSE disconnects Closes #11 * Fix SSE bootstrap query for empty blocks table * fix: address code review comments - sse.rs: replace silent error swallowing with tracing::warn! and continue - useBlockSSE: use named function expression to fix TS2448 self-reference - BlocksPage: filter SSE buffer instead of unconditional clear on fetch * fix: defer setState calls in effects to satisfy react-hooks/set-state-in-effect Wrap setSseBlocks calls in BlocksPage and setDisplayedHeight in Layout in requestAnimationFrame to avoid calling setState synchronously inside useEffect bodies, which is flagged by eslint-plugin-react-hooks v7. * fix: disable polling entirely while SSE is connected Stop polling every 10s as a safety net when SSE is active — periodic refetches disrupt the smooth live flow. Instead, refetch immediately when SSE disconnects to catch any missed blocks during the gap. * fix: stop polling when SSE connected, fix cursor advance on failed fetch - BlocksPage: skip API polling entirely while SSE is connected to avoid disrupting the live block flow; trigger an immediate refetch when SSE drops to recover any missed blocks - BlocksPage: guard SSE block merge to page 1 + autoRefresh only, so navigating to page 2+ never shows page-1 SSE blocks - sse.rs: only advance last_block_number after the initial block is successfully fetched and emitted, preventing the cursor from skipping the block on a transient fetch failure * docs: fix /api/height reference to actual /api/status endpoint, document SSE * fix: batch SSE prepend per frame to prevent burst block loss Replace cancel-and-reschedule RAF pattern with a pending buffer so that burst arrivals (e.g. blocks 100, 101, 102 before a frame fires) are all flushed in a single requestAnimationFrame rather than only the last block surviving. Also clarify CLAUDE.md /api/status contract. * fix: bound SSE catch-up query, add unit tests, fix docker volume - Add LIMIT 100 to the SSE block polling query to prevent unbounded memory usage and avoid infinite retry loops from statement_timeout - Add unit tests for NewBlockEvent serialization - Remove external: true from pgdata volume so docker compose up works on fresh systems * style: fix rustfmt formatting in sse tests * chore: simplify (#22) * simplify * fix build * feat: switch SSE fanout to postgres notifications * style: match rustfmt 1.94 output * style: align SSE formatting with CI * style: run stable rustfmt on SSE handler * fix: harden SSE client state handling * Refine live update streaming behavior * Fix backend clippy lint --------- Co-authored-by: Marko <marko@baricevic.me>
pthmas
added a commit
that referenced
this pull request
Mar 15, 2026
* feat: add SSE for live block updates Add Server-Sent Events endpoint (GET /api/events) that streams new blocks to the frontend in real-time, replacing polling for block height and blocks list updates. Backend: - New SSE handler polls DB every 200ms, emits one event per block in order - SSE route excluded from 10s TimeoutLayer so connections stay alive - Nginx configured to proxy SSE with buffering disabled Frontend: - useBlockSSE hook buffers events in a ref-based queue and drains at the chain's natural block rate (computed from on-chain timestamps) - Navbar counter updates instantly via SSE, block time derived from 30s rolling window of block timestamps for stability - BlocksPage prepends new blocks from SSE on page 1 with auto-refresh - Polling falls back automatically when SSE disconnects Closes #11 * Fix SSE bootstrap query for empty blocks table * fix: address code review comments - sse.rs: replace silent error swallowing with tracing::warn! and continue - useBlockSSE: use named function expression to fix TS2448 self-reference - BlocksPage: filter SSE buffer instead of unconditional clear on fetch * fix: defer setState calls in effects to satisfy react-hooks/set-state-in-effect Wrap setSseBlocks calls in BlocksPage and setDisplayedHeight in Layout in requestAnimationFrame to avoid calling setState synchronously inside useEffect bodies, which is flagged by eslint-plugin-react-hooks v7. * fix: disable polling entirely while SSE is connected Stop polling every 10s as a safety net when SSE is active — periodic refetches disrupt the smooth live flow. Instead, refetch immediately when SSE disconnects to catch any missed blocks during the gap. * fix: stop polling when SSE connected, fix cursor advance on failed fetch - BlocksPage: skip API polling entirely while SSE is connected to avoid disrupting the live block flow; trigger an immediate refetch when SSE drops to recover any missed blocks - BlocksPage: guard SSE block merge to page 1 + autoRefresh only, so navigating to page 2+ never shows page-1 SSE blocks - sse.rs: only advance last_block_number after the initial block is successfully fetched and emitted, preventing the cursor from skipping the block on a transient fetch failure * docs: fix /api/height reference to actual /api/status endpoint, document SSE * fix: batch SSE prepend per frame to prevent burst block loss Replace cancel-and-reschedule RAF pattern with a pending buffer so that burst arrivals (e.g. blocks 100, 101, 102 before a frame fires) are all flushed in a single requestAnimationFrame rather than only the last block surviving. Also clarify CLAUDE.md /api/status contract. * fix: bound SSE catch-up query, add unit tests, fix docker volume - Add LIMIT 100 to the SSE block polling query to prevent unbounded memory usage and avoid infinite retry loops from statement_timeout - Add unit tests for NewBlockEvent serialization - Remove external: true from pgdata volume so docker compose up works on fresh systems * style: fix rustfmt formatting in sse tests * chore: simplify (#22) * simplify * fix build * feat: switch SSE fanout to postgres notifications * style: match rustfmt 1.94 output * style: align SSE formatting with CI * style: run stable rustfmt on SSE handler * fix: harden SSE client state handling * Refine live update streaming behavior * Fix backend clippy lint --------- Co-authored-by: Marko <marko@baricevic.me>
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Overview
run simplify on the code changes in sse events prs. Feel free to close if this is not needed