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fix: handle pruned state in event fetch to prevent crash loops

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When SubQuery restarts and the last processed block's state has been
pruned by the RPC node, fetchEventsRange would crash the indexer in a
loop. Now returns empty events for pruned blocks so the indexer can
skip forward gracefully.
This commit is contained in:
Kurdistan Tech Ministry
2026-02-21 17:30:34 +03:00
parent a4a5314f79
commit 45784e1196
1 changed files with 13 additions and 5 deletions
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docker/patches/pruned-state-fallback.js
+13 -5
View File
@@ -53,9 +53,17 @@ initCode = initCode.replace(
fs.writeFileSync(initFile, initCode);
console.log(`[3/4] @polkadot/api Init.js: ${count} patches`);
// --- Patch 4: @polkadot/api events.js (system.events.at) ---
// fetchEventsRange calls api.query.system.events.at(hash) which may also fail
// for pruned blocks. Not patching this as it's a data fetch, not startup blocker.
// SubQuery will retry or skip those blocks.
// --- Patch 4: @subql/node utils/substrate.js (fetchEventsRange) ---
// When events.at(hash) fails with "State already discarded" for pruned blocks,
// return an empty events array instead of crashing. The block is processed with
// no events (data is lost anyway since state was pruned).
count = 0;
let utilsCode2 = fs.readFileSync(utilsFile, "utf8");
utilsCode2 = utilsCode2.replace(
/api\.query\.system\.events\.at\(hash\)\.catch\(\(e\) => \{/g,
() => { count++; return "api.query.system.events.at(hash).catch((e) => { if (e.message && e.message.includes('State already discarded')) { const empty = []; empty.toArray = () => []; return empty; }"; }
);
fs.writeFileSync(utilsFile, utilsCode2);
console.log(`[4/5] utils/substrate.js fetchEventsRange: ${count} patches`);
console.log("[4/4] All pruned-state patches applied successfully.");
console.log("[5/5] All pruned-state patches applied successfully.");