[auricom]

Implements the P1 issues from the optimization roadmap (#53).

Changes

Verifier (#39, #41, plus the verifier parts of #40 and #43): pkg/exporters/verifier/

• Timer-based retries ([P1] Verifier: decouple retry waits from workers (throughput cap + skewed block_time) #39). Workers no longer sleep through the 0/20/40/60/90/120s retry schedule. Each worker makes one attempt per job and schedules the next with time.AfterFunc, so throughput is limited by RPC concurrency instead of wait time. This also means block_time_seconds is no longer skewed when the queue fills.
  • The 5-minute cooldown re-queue after retries run out is kept.
  • The schedule and cooldown are fields, so tests can shorten them.
• Reconnect backfill ([P1] Verifier: backfill blocks missed during WebSocket reconnect #41). A height gap after a WebSocket reconnect triggers one goroutine that fetches the missing headers with HeaderByNumber and enqueues them.
  • It keeps only the most recent 1000 and logs a Warn with how many were dropped.
  • Backfilled headers don't feed RecordBlockTime.
• One ev-node call per attempt ([P1] Verifier: remove duplicate ev-node call and cache Celestia lookups per DA height #40). GetBlock followed by GetBlockWithBlobs is now a single GetBlockWithBlobs.
• Interfaces. The verifier now depends on small consumer-side interfaces (blockSource, daVerifier, headSource), which makes it testable with fakes. The concrete clients satisfy them unchanged.
• Logging ([P1] Reduce per-block log volume and add --log-format=json #43). Per-block success logs are now Debug.

Celestia per-DA-height cache (#40): internal/clients/celestia/

• GetBlockTimestamp and GetBlobsAtHeight results are memoized per DA height (and namespace) for 2 minutes. Concurrent lookups for the same key share one in-flight fetch via singleflight.
• Errors, "not found" and empty results are never cached.
• One caller cancelling doesn't fail the others: the shared fetch is detached from the caller's cancellation and capped at 30s.
• Per-block success logs are now Debug.

Drift and balance (#42): pkg/exporters/drift/, pkg/exporters/balance/, internal/clients/cosmos/

• Clients are created once and reused. Drift closes a client and redials after an error.
• Each RPC call has a 5s timeout.
• Drift polls full nodes concurrently.
• Both exporters run their first poll immediately at startup.
• Balance: https:// consensus endpoints now use TLS (port 443 by default). Before, they silently failed because the connection was forced to plaintext.
• Per-poll success logs are now Debug.

Log format (#43): cmd/monitor.go, pkg/exporters/jsonrpc/

• New --log-format=console|json flag, defaulting to console. Invalid values are rejected at startup.
• The per-scrape JSON-RPC health-check log is now Debug.

Security bumps (#54): go.mod, go.sum, Dockerfile

• go-ethereum v1.17.0, grpc v1.83.1, x/net v0.60.0, cometbft v0.38.21 (indirect).
• govulncheck goes from 11 reachable vulnerabilities to 1. The remaining one is GO-2026-5932 in x/crypto, which has no fix yet.
• Go 1.26 is required because x/net v0.60.0 needs it. The Dockerfile builder image is bumped to golang:1.26-alpine to match.

Behaviour changes for operators

• Per-block and per-poll success messages are now Debug level. Use --verbose to see them.
• Drift and balance check once at startup instead of after the first interval.
• Blocks missed during a WebSocket reconnect are now verified. unsubmitted_blocks_total may rise where those blocks used to be silently skipped.

Tests

• New: the verifier with fakes (first try, retry without blocking other blocks, retries running out, cooldown re-queue, backfill gap and cap, shutdown), the Celestia cache (dedup, no caching of errors or empty results, TTL expiry, cancellation), drift with a hung node, balance failover and connection reuse, cosmos endpoint parsing, and the logger format.
• Results:
  • go build, go vet, go test -race ./..., golangci-lint (0 issues), gofmt and go mod tidy are all clean.
• Not done: I couldn't test the Docker build locally.

Fixes #39
Fixes #40
Fixes #41
Fixes #42
Fixes #43
Fixes #54

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