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refactor(ready): name the Stellar ledger close-time constant #140

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refactor(ready): name the Stellar ledger close-time constant #140

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5 changes: 4 additions & 1 deletion src/api/server.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,9 @@ import { MemoryNonceStore, PostgresNonceStore, type NonceStore } from '../auth.j
import { readFileSync } from 'fs'
import { dirname, join } from 'path'
import { fileURLToPath } from 'url'
// Stellar's nominal ledger close time, used to convert a lag in ledgers into
// an estimated lag in seconds for the /ready readiness probe.
const STELLAR_LEDGER_CLOSE_TIME_SECONDS = 5

interface CursorRow {
last_ledger: number | null
Expand Down Expand Up @@ -141,7 +144,7 @@ export async function buildServer(opts: BuildServerOptions = {}): Promise<Fastif
const ledgersBehind = lastLedger != null && tipLedger != null && tipLedger > lastLedger
? tipLedger - lastLedger
: null
const estimatedLagSeconds = ledgersBehind != null ? ledgersBehind * 5 : null
const estimatedLagSeconds = ledgersBehind != null ? ledgersBehind * STELLAR_LEDGER_CLOSE_TIME_SECONDS : null

if (isStale) {
return reply.code(503).send({
Expand Down