New internal/zmqmon package subscribes to bitcoind's hashblock
ZMQ topic and emits TipEvents. Uses github.com/go-zeromq/zmq4
(pure Go, builds with CGO_ENABLED=0). Exponential backoff on
connection failure so bitcoind restarts don't kill the
subscriber permanently; event channel drops rather than blocks
if the consumer is slow (signals are advisory, not logs).
Aggregator.Run now takes a <-chan TipEvent; when a tip arrives
it fires an immediate refresh() outside the normal ticker
cadence. With a 5s poll interval and 0.5-1s ZMQ latency from
bitcoind, dashboards now reflect new tips roughly 4x faster.
Endpoint comes from BITCOIN_ZMQ_BLOCK — empty disables ZMQ
entirely and the aggregator just runs on the ticker alone.
New internal/store package wraps modernc.org/sqlite (pure Go,
no CGO) with a BlockStore that exposes Open/Close/InsertBlock/
Recent. The aggregator now accepts an optional *store.BlockStore;
on Run() it loads up to maxBlockHistory rows from the store before
the first refresh, and each ingested block gets written to the
DB before being appended to the in-memory ring.
main.go opens the store at cfg.DBPath and logs a warning + falls
back to in-memory-only if the file can't be created — a broken
data volume shouldn't stop the pool from running.
InsertBlock uses INSERT OR IGNORE on the height primary key so
replayed log events after a restart are harmless.
satoshi