mirror of
https://github.com/pezkuwichain/pezkuwi-subquery.git
synced 2026-04-22 01:57:58 +00:00
pezkuwichain
45784e1196
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.
70 lines
3.4 KiB
JavaScript
70 lines
3.4 KiB
JavaScript
/**
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* Patch @subql/node and @polkadot/api to handle pruned blockchain state.
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*
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* Problem: Substrate nodes prune historical state by default (~256 blocks).
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* When SubQuery restarts and tries to fetch runtime version for old blocks,
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* state_getRuntimeVersion fails with "State already discarded" and the node
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* enters a crash loop.
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*
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* Fix: When getRuntimeVersion(blockHash) fails due to pruned state,
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* fall back to getRuntimeVersion() (current runtime version).
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* This is safe for chains with infrequent spec upgrades.
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*/
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const fs = require("fs");
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let count = 0;
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// --- Patch 1: @subql/node base-runtime.service.js ---
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// getSpecFromApi() and getRuntimeVersion() call
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// this.api.rpc.state.getRuntimeVersion(parentBlockHash)
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const runtimeFile =
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"/app/node_modules/@subql/node/dist/indexer/runtime/base-runtime.service.js";
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let runtimeCode = fs.readFileSync(runtimeFile, "utf8");
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runtimeCode = runtimeCode.replace(
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/await this\.api\.rpc\.state\.getRuntimeVersion\((\w+)\)/g,
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(m, v) => { count++; return `await this.api.rpc.state.getRuntimeVersion(${v}).catch(() => this.api.rpc.state.getRuntimeVersion())`; }
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);
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fs.writeFileSync(runtimeFile, runtimeCode);
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console.log(`[1/4] base-runtime.service.js: ${count} patches`);
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// --- Patch 2: @subql/node utils/substrate.js ---
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// fetchRuntimeVersionRange() catches and rethrows; add fallback before rethrow
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count = 0;
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const utilsFile =
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"/app/node_modules/@subql/node/dist/utils/substrate.js";
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let utilsCode = fs.readFileSync(utilsFile, "utf8");
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utilsCode = utilsCode.replace(
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/api\.rpc\.state\.getRuntimeVersion\(hash\)\.catch\(\(e\)/g,
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() => { count++; return "api.rpc.state.getRuntimeVersion(hash).catch(() => api.rpc.state.getRuntimeVersion()).catch((e)"; }
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);
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fs.writeFileSync(utilsFile, utilsCode);
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console.log(`[2/4] utils/substrate.js: ${count} patches`);
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// --- Patch 3: @polkadot/api Init.js ---
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// _getBlockRegistryViaHash calls getRuntimeVersion.raw(header.parentHash)
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// which fails when parentHash points to a pruned block (including genesis).
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count = 0;
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const initFile =
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"/app/node_modules/@polkadot/api/cjs/base/Init.js";
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let initCode = fs.readFileSync(initFile, "utf8");
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initCode = initCode.replace(
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/await \(0, rxjs_1\.firstValueFrom\)\(this\._rpcCore\.state\.getRuntimeVersion\.raw\(header\.parentHash\)\)/g,
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() => { count++; return "await (0, rxjs_1.firstValueFrom)(this._rpcCore.state.getRuntimeVersion.raw(header.parentHash)).catch(() => (0, rxjs_1.firstValueFrom)(this._rpcCore.state.getRuntimeVersion()))"; }
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);
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fs.writeFileSync(initFile, initCode);
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console.log(`[3/4] @polkadot/api Init.js: ${count} patches`);
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// --- Patch 4: @subql/node utils/substrate.js (fetchEventsRange) ---
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// When events.at(hash) fails with "State already discarded" for pruned blocks,
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// return an empty events array instead of crashing. The block is processed with
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// no events (data is lost anyway since state was pruned).
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count = 0;
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let utilsCode2 = fs.readFileSync(utilsFile, "utf8");
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utilsCode2 = utilsCode2.replace(
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/api\.query\.system\.events\.at\(hash\)\.catch\(\(e\) => \{/g,
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() => { 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; }"; }
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);
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fs.writeFileSync(utilsFile, utilsCode2);
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console.log(`[4/5] utils/substrate.js fetchEventsRange: ${count} patches`);
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console.log("[5/5] All pruned-state patches applied successfully.");
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