indexer: support testnet Solana RPC URL for shred-subscription reads#670
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Adds SOLANA_RPC_URL_TESTNET env var to the secondary network indexer, mirroring the existing DZ_LEDGER_RPC_URL_TESTNET pattern. When set, the shred-subscription client reads from this endpoint instead of the DZ ledger. Backward-compatible: when unset, shreds continues to read from the DZ ledger as today. Prep for malbeclabs/infra#1762: testnet shred-subscription moves to Solana devnet via a paid Helius endpoint, in lockstep with the shred-oracle cutover (#1760).
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Summary of Changes
Adds a
SOLANA_RPC_URL_TESTNETenv var to the secondary network indexer, mirroring the existingDZ_LEDGER_RPC_URL_TESTNETpattern. When set, the shred-subscription client reads from this endpoint; when unset it falls back to the DZ ledger (today's behavior). Serviceability, telemetry, and geolocation read paths are unaffected.Context (parent issue)
Part of malbeclabs/infra#1762 / epic #1758. The testnet shred-subscription program is moving from the DZ Ledger testnet to a Solana devnet deployment, in lockstep with the shred-oracle cutover.
This is the Phase 1 read-path change, kept off the critical path so it can bake in prod ahead of the coordinated flip. The flip itself is a separate infra step: setting
SOLANA_RPC_URL_TESTNETon the lake-indexer Deployment in lockstep with the oracle overlay removal.Why merging + promoting to prod has no impact
The new behavior is gated on
SOLANA_RPC_URL_TESTNET, which is not set on the prod Deployment or inlake-indexer-envand has no default. Unset, the RPC selection resolves to the same DZ-ledger endpoint used today. This is a read-path-only change: no schema, migrations, or write path, so existingdim_dz_shred_*/fact_dz_shred_escrow_eventsrows are untouched. The only visible change in prod is the addedrpc_urllog field, which will show the current DZ-ledger URL — confirming behavior is unchanged.Rollback
Revert the commit. The env var is additive and only consumed when set; no state migration.