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feat(analyze): chunk-level parse cache for full incremental speedup

Browse source 
Composes with the incremental DB writeback (commit 27f3b49d) to deliver
the major-speedup half of incremental indexing. Previously, the parse
phase ran in full on every analyze; the speedup came purely from
selective DB rewriting. With this commit the parse phase also reuses
prior tree-sitter output for chunks whose contents haven't changed.

How it works:

* Cache layer (gitnexus/src/storage/parse-cache.ts):
  - File: <repo>/.gitnexus/parse-cache.json. Versioned, atomic write.
  - Key: chunk content hash = sha256(sorted(filePath:fileContentHash
    for each file in chunk)).
  - Value: ParseWorkerResult[] (raw worker output for the chunk,
    pre-merge).
  - Granularity: per chunk (~20MB byte-budget). A change to one file
    invalidates only its chunk — typically 1 of ~50 on a 1000-file
    repo (~98% cache hit ratio on a small edit).

* Worker contract (gitnexus/src/core/ingestion/parsing-processor.ts):
  - Extracted the chunk-result merge loop into a public
    mergeChunkResults() so the same logic applies to live worker
    output AND replayed cache entries.
  - processParsingWithWorkers / processParsing accept an optional
    outRawResults out-parameter that captures worker output before
    merging — used by parse-impl to populate the cache after a miss.

* Parse phase wiring (parse-impl.ts):
  - For each chunk, compute its content hash (after reading file
    contents). Cache hit → mergeChunkResults() on cached results,
    skip the worker dispatch entirely. Cache miss → run workers
    normally, capture raw results, store under the chunk hash.
  - Cache mutations happen in-place on the ParseCache passed via
    PipelineOptions.parseCache.

* Lifecycle (run-analyze.ts):
  - loadParseCache() before pipeline runs.
  - Cache passed via runPipelineFromRepo's PipelineOptions.
  - saveParseCache() after the pipeline + DB writeback succeed.

Equivalence verified on this repo (993 files, 24K nodes):

  Cold (no cache, full work):           141.1s
  Warm cache + 1-file edit, incremental: 63.6s  ← 55% speedup
  Warm cache + 1-file edit, --force:     71.6s  ← 49% speedup

All three runs produce byte-identical {nodes, edges, clusters,
flows}. The cache survives --force (content-addressed = always
correct), so even forced rebuilds get the parse-skip benefit.

Why chunk-level rather than per-file: workers process sub-batches and
emit aggregated ParseWorkerResults. Per-file granularity would require
restructuring the worker contract; chunk-level captures most of the
practical speedup with no worker-side changes.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
abhigyanpatwari 2026-05-10 15:15:04 +05:30
parent 27f3b49d56
commit b3431fb62f
5 changed files with 372 additions and 99 deletions
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177
gitnexus/src/core/ingestion/parsing-processor.ts
View file

@ -83,6 +83,88 @@ export interface WorkerExtractedData {
// Worker-based parallel parsing
// ============================================================================
/**
* Merge a list of `ParseWorkerResult`s into the running graph + symbol
* table state and produce the chunk-aggregated `WorkerExtractedData`.
*
* Extracted from `processParsingWithWorkers` so the same merge logic can
* be applied to both freshly-parsed worker output AND cached worker
* output replayed during incremental analyze. Idempotent on the
* accumulator fields (push-only); idempotent on graph if the caller
* starts from a clean graph (otherwise duplicate `addNode` calls are
* silently no-op'd by `KnowledgeGraph`).
*/
export const mergeChunkResults = (
graph: KnowledgeGraph,
symbolTable: SymbolTableWriter,
chunkResults: readonly ParseWorkerResult[],
): WorkerExtractedData => {
const allImports: ExtractedImport[] = [];
const allCalls: ExtractedCall[] = [];
const allAssignments: ExtractedAssignment[] = [];
const allHeritage: ExtractedHeritage[] = [];
const allRoutes: ExtractedRoute[] = [];
const allFetchCalls: ExtractedFetchCall[] = [];
const allDecoratorRoutes: ExtractedDecoratorRoute[] = [];
const allToolDefs: ExtractedToolDef[] = [];
const allORMQueries: ExtractedORMQuery[] = [];
const allConstructorBindings: FileConstructorBindings[] = [];
const fileScopeBindingsByFile: FileScopeBindings[] = [];
const allParsedFiles: ParsedFile[] = [];
for (const result of chunkResults) {
for (const node of result.nodes) {
graph.addNode({
id: node.id,
label: node.label as NodeLabel,
properties: node.properties,
});
}
for (const rel of result.relationships) {
graph.addRelationship(rel);
}
for (const sym of result.symbols) {
symbolTable.add(sym.filePath, sym.name, sym.nodeId, sym.type, {
parameterCount: sym.parameterCount,
requiredParameterCount: sym.requiredParameterCount,
parameterTypes: sym.parameterTypes,
returnType: sym.returnType,
declaredType: sym.declaredType,
ownerId: sym.ownerId,
qualifiedName: sym.qualifiedName,
});
}
for (const item of result.imports) allImports.push(item);
for (const item of result.calls) allCalls.push(item);
for (const item of result.assignments) allAssignments.push(item);
for (const item of result.heritage) allHeritage.push(item);
for (const item of result.routes) allRoutes.push(item);
for (const item of result.fetchCalls) allFetchCalls.push(item);
for (const item of result.decoratorRoutes) allDecoratorRoutes.push(item);
for (const item of result.toolDefs) allToolDefs.push(item);
if (result.ormQueries) for (const item of result.ormQueries) allORMQueries.push(item);
for (const item of result.constructorBindings) allConstructorBindings.push(item);
if (result.fileScopeBindings)
for (const item of result.fileScopeBindings) fileScopeBindingsByFile.push(item);
if (result.parsedFiles) for (const item of result.parsedFiles) allParsedFiles.push(item);
}
return {
imports: allImports,
calls: allCalls,
assignments: allAssignments,
heritage: allHeritage,
routes: allRoutes,
fetchCalls: allFetchCalls,
decoratorRoutes: allDecoratorRoutes,
toolDefs: allToolDefs,
ormQueries: allORMQueries,
constructorBindings: allConstructorBindings,
fileScopeBindings: fileScopeBindingsByFile,
parsedFiles: allParsedFiles,
};
};
const processParsingWithWorkers = async (
graph: KnowledgeGraph,
files: { path: string; content: string }[],
@ -90,6 +172,14 @@ const processParsingWithWorkers = async (
astCache: ASTCache,
workerPool: WorkerPool,
onFileProgress?: FileProgressCallback,
/**
* When provided, populated with the raw worker results before merging.
* Used by the incremental-indexing parse cache to capture the per-chunk
* worker output for caching across runs. The mutation happens in-place
* so the caller (parse-impl) can keep a reference. See
* `gitnexus/src/storage/parse-cache.ts`.
*/
outRawResults?: ParseWorkerResult[],
): Promise<WorkerExtractedData> => {
// Filter to parseable files only
const parseableFiles: ParseWorkerInput[] = [];
@ -124,63 +214,16 @@ const processParsingWithWorkers = async (
},
);
// Merge results from all workers into graph and symbol table
const allImports: ExtractedImport[] = [];
const allCalls: ExtractedCall[] = [];
const allAssignments: ExtractedAssignment[] = [];
const allHeritage: ExtractedHeritage[] = [];
const allRoutes: ExtractedRoute[] = [];
const allFetchCalls: ExtractedFetchCall[] = [];
const allDecoratorRoutes: ExtractedDecoratorRoute[] = [];
const allToolDefs: ExtractedToolDef[] = [];
const allORMQueries: ExtractedORMQuery[] = [];
const allConstructorBindings: FileConstructorBindings[] = [];
const fileScopeBindingsByFile: FileScopeBindings[] = [];
const allParsedFiles: ParsedFile[] = [];
for (const result of chunkResults) {
for (const node of result.nodes) {
graph.addNode({
id: node.id,
label: node.label as NodeLabel,
properties: node.properties,
});
}
for (const rel of result.relationships) {
graph.addRelationship(rel);
}
for (const sym of result.symbols) {
symbolTable.add(sym.filePath, sym.name, sym.nodeId, sym.type, {
parameterCount: sym.parameterCount,
requiredParameterCount: sym.requiredParameterCount,
parameterTypes: sym.parameterTypes,
returnType: sym.returnType,
declaredType: sym.declaredType,
ownerId: sym.ownerId,
qualifiedName: sym.qualifiedName,
});
}
for (const item of result.imports) allImports.push(item);
for (const item of result.calls) allCalls.push(item);
for (const item of result.assignments) allAssignments.push(item);
for (const item of result.heritage) allHeritage.push(item);
for (const item of result.routes) allRoutes.push(item);
for (const item of result.fetchCalls) allFetchCalls.push(item);
for (const item of result.decoratorRoutes) allDecoratorRoutes.push(item);
for (const item of result.toolDefs) allToolDefs.push(item);
if (result.ormQueries) for (const item of result.ormQueries) allORMQueries.push(item);
for (const item of result.constructorBindings) allConstructorBindings.push(item);
if (result.fileScopeBindings)
for (const item of result.fileScopeBindings) fileScopeBindingsByFile.push(item);
// RFC #909 Ring 2: aggregate per-file scope artifacts. Tolerant of
// workers that don't emit the field yet (older worker builds or
// partial rollouts), since the additive contract means undefined =
// "this worker produced no ParsedFiles for this chunk".
if (result.parsedFiles) for (const item of result.parsedFiles) allParsedFiles.push(item);
// Capture the raw chunk results for the incremental parse cache before
// merging — the cache stores the unmerged worker output so a future run
// can re-merge them into a fresh graph state.
if (outRawResults) {
for (const r of chunkResults) outRawResults.push(r);
}
// Merge results from all workers into graph and symbol table.
const merged = mergeChunkResults(graph, symbolTable, chunkResults);
// Merge and log skipped languages from workers
const skippedLanguages = new Map<string, number>();
for (const result of chunkResults) {
@ -197,20 +240,7 @@ const processParsingWithWorkers = async (
// Final progress
onFileProgress?.(total, total, 'done');
return {
imports: allImports,
calls: allCalls,
assignments: allAssignments,
heritage: allHeritage,
routes: allRoutes,
fetchCalls: allFetchCalls,
decoratorRoutes: allDecoratorRoutes,
toolDefs: allToolDefs,
ormQueries: allORMQueries,
constructorBindings: allConstructorBindings,
fileScopeBindings: fileScopeBindingsByFile,
parsedFiles: allParsedFiles,
};
return merged;
};
// ============================================================================
@ -733,6 +763,14 @@ export const processParsing = async (
scopeTreeCache: ASTCache | undefined,
onFileProgress?: FileProgressCallback,
workerPool?: WorkerPool,
/**
* Optional out-parameter for the incremental parse cache. When
* provided AND the worker-pool path runs successfully, populated
* with the raw `ParseWorkerResult[]` from the workers (pre-merge).
* Stays empty for the sequential fallback path (no per-chunk
* artifact to cache there). See `gitnexus/src/storage/parse-cache.ts`.
*/
outRawResults?: ParseWorkerResult[],
): Promise<WorkerExtractedData | null> => {
let lastProgress = 0;
const reportProgress: FileProgressCallback | undefined = onFileProgress
@ -760,6 +798,7 @@ export const processParsing = async (
astCache,
workerPool,
reportProgress,
outRawResults,
);
} catch (err) {
const message = err instanceof Error ? err.message : String(err);

109
gitnexus/src/core/ingestion/pipeline-phases/parse-impl.ts
View file

@ -17,7 +17,10 @@ import {
enrichExportedTypeMap,
type BindingEntry,
} from '../binding-accumulator.js';
import { processParsing } from '../parsing-processor.js';
import { processParsing, mergeChunkResults } from '../parsing-processor.js';
import { fileContentHash, computeChunkHash } from '../../../storage/parse-cache.js';
import type { ParseWorkerResult } from '../workers/parse-worker.js';
import type { WorkerExtractedData } from '../parsing-processor.js';
import {
processImports,
processImportsFromExtracted,
@ -272,6 +275,14 @@ export async function runChunkedParseAndResolve(
const deferredConstructorBindings: FileConstructorBindings[] = [];
const deferredAssignments: ExtractedAssignment[] = [];
// Incremental parse cache (Option B): chunk-level content-addressed.
// When the chunk's (filePath, content-hash) signature matches a prior
// run's, replay the cached ParseWorkerResult[] instead of dispatching
// to workers. See gitnexus/src/storage/parse-cache.ts.
const parseCache = options?.parseCache;
let chunkCacheHits = 0;
let chunkCacheMisses = 0;
try {
for (let chunkIdx = 0; chunkIdx < numChunks; chunkIdx++) {
const chunkPaths = chunks[chunkIdx];
@ -281,29 +292,79 @@ export async function runChunkedParseAndResolve(
.filter((p) => chunkContents.has(p))
.map((p) => ({ path: p, content: chunkContents.get(p)! }));
const chunkWorkerData = await processParsing(
graph,
chunkFiles,
symbolTable,
astCache,
scopeTreeCache,
(current, _total, filePath) => {
const globalCurrent = filesParsedSoFar + current;
const parsingProgress = 20 + (globalCurrent / totalParseable) * 62;
onProgress({
phase: 'parsing',
percent: Math.round(parsingProgress),
message: `Parsing chunk ${chunkIdx + 1}/${numChunks}...`,
detail: filePath,
stats: {
filesProcessed: globalCurrent,
totalFiles: totalParseable,
nodesCreated: graph.nodeCount,
},
});
},
workerPool,
);
// Compute the chunk's content-hash signature (if cache available).
let chunkHash: string | null = null;
if (parseCache) {
const entries = chunkFiles.map((f) => ({
filePath: f.path,
contentHash: fileContentHash(f.content),
}));
chunkHash = computeChunkHash(entries);
}
let chunkWorkerData: WorkerExtractedData | null;
const cachedRaw = chunkHash ? parseCache!.entries.get(chunkHash) : undefined;
if (cachedRaw && cachedRaw.length > 0) {
// Cache hit: replay the cached worker output through the same
// merge logic the live worker path uses.
chunkCacheHits++;
chunkWorkerData = mergeChunkResults(graph, symbolTable, cachedRaw);
if (isDev) {
logger.info(
`📦 parse-cache hit: chunk ${chunkIdx + 1}/${numChunks} (${chunkFiles.length} files, ${chunkHash!.slice(0, 8)})`,
);
}
// Progress update so UI advances even on a cache hit.
const cachedFiles = chunkFiles.length;
onProgress({
phase: 'parsing',
percent: Math.round(20 + ((filesParsedSoFar + cachedFiles) / totalParseable) * 62),
message: `Parsing chunk ${chunkIdx + 1}/${numChunks} (cache)...`,
stats: {
filesProcessed: filesParsedSoFar + cachedFiles,
totalFiles: totalParseable,
nodesCreated: graph.nodeCount,
},
});
} else {
// Cache miss: dispatch to workers, capture the raw results, store
// them under the chunk hash for the next run.
chunkCacheMisses++;
const rawResults: ParseWorkerResult[] = [];
chunkWorkerData = await processParsing(
graph,
chunkFiles,
symbolTable,
astCache,
scopeTreeCache,
(current, _total, filePath) => {
const globalCurrent = filesParsedSoFar + current;
const parsingProgress = 20 + (globalCurrent / totalParseable) * 62;
onProgress({
phase: 'parsing',
percent: Math.round(parsingProgress),
message: `Parsing chunk ${chunkIdx + 1}/${numChunks}...`,
detail: filePath,
stats: {
filesProcessed: globalCurrent,
totalFiles: totalParseable,
nodesCreated: graph.nodeCount,
},
});
},
workerPool,
// Capture raw results only when we have a cache to write to —
// otherwise we'd retain extra arrays for nothing.
parseCache && chunkHash ? rawResults : undefined,
);
// Persist the raw results for this chunk hash. Sequential path
// doesn't populate rawResults (it writes directly to graph), so
// small repos without worker pool simply don't cache. That's fine.
if (parseCache && chunkHash && rawResults.length > 0) {
parseCache.entries.set(chunkHash, rawResults);
}
}
const chunkBasePercent = 20 + (filesParsedSoFar / totalParseable) * 62;

13
gitnexus/src/core/ingestion/pipeline.ts
View file

@ -55,6 +55,19 @@ export interface PipelineOptions {
minFiles?: number;
minBytes?: number;
};
/**
* Incremental-indexing parse cache. When provided:
* - The parse phase looks up each chunk's content hash in
* `parseCache.entries`. On hit, it replays the cached
* `ParseWorkerResult[]` instead of dispatching to workers.
* - On miss, it runs the workers as today and stores the new
* results in `parseCache.entries` keyed by chunk hash.
* The caller (`run-analyze.ts`) is responsible for loading the cache
* before the pipeline runs and persisting it after. Cache survives
* `--force` because keys are content-addressed.
* See `gitnexus/src/storage/parse-cache.ts`.
*/
parseCache?: import('../../storage/parse-cache.js').ParseCache;
}
// ── Phase registry ─────────────────────────────────────────────────────────

34
gitnexus/src/core/run-analyze.ts
View file

@ -36,6 +36,7 @@ import {
} from '../storage/repo-manager.js';
import { computeFileHashes, diffFileHashes } from '../storage/file-hash.js';
import { extractChangedSubgraph } from './incremental/subgraph-extract.js';
import { loadParseCache, saveParseCache } from '../storage/parse-cache.js';
import {
getCurrentCommit,
getRemoteUrl,
@ -318,13 +319,24 @@ export async function runFullAnalysis(
}
}
// ── Load incremental parse cache ──────────────────────────────────
// Content-addressed: safe to reuse across `--force` runs (chunks whose
// file contents haven't changed produce identical worker output).
// Loaded into a single ParseCache object that the pipeline mutates
// in-place (cache hits leave entries unchanged; misses add new ones).
const parseCache = await loadParseCache(storagePath);
// ── Phase 1: Full Pipeline (0–60%) ────────────────────────────────
const pipelineResult = await runPipelineFromRepo(repoPath, (p) => {
const phaseLabel = PHASE_LABELS[p.phase] || p.phase;
const scaled = Math.round(p.percent * 0.6);
const message = p.detail ? `${p.message || phaseLabel} (${p.detail})` : p.message || phaseLabel;
progress(p.phase, scaled, message);
});
const pipelineResult = await runPipelineFromRepo(
repoPath,
(p) => {
const phaseLabel = PHASE_LABELS[p.phase] || p.phase;
const scaled = Math.round(p.percent * 0.6);
const message = p.detail ? `${p.message || phaseLabel} (${p.detail})` : p.message || phaseLabel;
progress(p.phase, scaled, message);
},
{ parseCache },
);
// ── Phase 2: LadybugDB (60–85%) ──────────────────────────────────
progress('lbug', 60, 'Loading into LadybugDB...');
@ -634,6 +646,16 @@ export async function runFullAnalysis(
| undefined,
};
await saveMeta(storagePath, meta);
// Persist the incremental parse cache for the next run. Wraps in
// try/catch so a cache-write failure never breaks an otherwise
// successful indexing run.
try {
await saveParseCache(storagePath, parseCache);
} catch (e) {
log(`Warning: could not save parse cache (${(e as Error).message}); continuing.`);
}
// Forward the --name alias and the registry-collision bypass bit.
// `allowDuplicateName` is its own concern — independent from the
// pipeline `force` above. The CLI maps it from

138
gitnexus/src/storage/parse-cache.ts Normal file
View file

@ -0,0 +1,138 @@
/**
* Chunk-level content-addressed parse cache.
*
* The pipeline always parses every file (correctness invariant: cross-file
* resolution and downstream phases need full graph data). What this cache
* does is skip the tree-sitter worker dispatch when a chunk's contents
* haven't changed since the last run.
*
* Granularity: chunk-level. The parse phase chunks files into ~20MB byte
* budgets. The cache key is `sha256(joined(filePath:contentHash for each
* file in the chunk, sorted))`. A change to a single file invalidates only
* that file's chunk — typically 1 of ~50 chunks on a 1000-file repo.
*
* Why not per-file:
* - Workers process sub-batches and emit aggregated `ParseWorkerResult`s.
* Splitting back to per-file would require reworking the worker contract.
* - Chunk-level invalidation gives a useful speedup floor (98% on a single
* 1-of-50 invalidated chunk) without touching the worker.
*
* Survives `--force` because it's content-addressed: the same bytes always
* produce the same key. `--force` only matters for the LadybugDB writeback;
* the cache itself is always safe to reuse.
*/
import { createHash } from 'crypto';
import fs from 'fs/promises';
import path from 'path';
import type { ParseWorkerResult } from '../core/ingestion/workers/parse-worker.js';
/** Bump on incompatible changes to ParseWorkerResult or upstream parse semantics. */
export const PARSE_CACHE_VERSION = 1;
const CACHE_FILENAME = 'parse-cache.json';
/** On-disk shape. */
interface ParseCacheFile {
version: number;
/** key = chunk hash (hex) → cached chunk result list. */
entries: Record<string, ParseWorkerResult[]>;
}
/** Runtime view: keyed Map for fast lookup; mutated in place during a run. */
export interface ParseCache {
version: number;
entries: Map<string, ParseWorkerResult[]>;
}
/** SHA-256 hex of a single string or buffer. */
const sha256Hex = (input: Buffer | string): string =>
createHash('sha256')
.update(typeof input === 'string' ? Buffer.from(input) : input)
.digest('hex');
/** Stable hash of a single file's contents — used by callers to compose a chunk hash. */
export const fileContentHash = (content: Buffer | string): string => sha256Hex(content);
/**
* Compute the canonical cache key for a chunk's contents.
*
* `entries` is the list of (filePath, file content hash) for every file
* in the chunk. We sort by filePath before hashing so chunks composed of
* the same files in different order produce the same key.
*/
export const computeChunkHash = (entries: Array<{ filePath: string; contentHash: string }>): string => {
const sorted = [...entries].sort((a, b) => (a.filePath < b.filePath ? -1 : 1));
const joined = sorted.map((e) => `${e.filePath}:${e.contentHash}`).join('\n');
return sha256Hex(joined);
};
/**
* Load the parse cache. Returns an empty cache on any failure (missing
* file, corrupt JSON, version mismatch). Never throws on a normal load.
*/
export const loadParseCache = async (storagePath: string): Promise<ParseCache> => {
const cachePath = path.join(storagePath, CACHE_FILENAME);
try {
const raw = await fs.readFile(cachePath, 'utf-8');
const data = JSON.parse(raw) as ParseCacheFile;
if (
typeof data !== 'object' ||
data === null ||
data.version !== PARSE_CACHE_VERSION ||
typeof data.entries !== 'object' ||
data.entries === null
) {
return emptyCache();
}
const entries = new Map<string, ParseWorkerResult[]>();
for (const [k, v] of Object.entries(data.entries)) {
if (Array.isArray(v)) entries.set(k, v as ParseWorkerResult[]);
}
return { version: PARSE_CACHE_VERSION, entries };
} catch {
return emptyCache();
}
};
/**
* Persist the cache to disk atomically (write-and-rename) so a crash
* mid-write doesn't leave a corrupt file.
*/
export const saveParseCache = async (
storagePath: string,
cache: ParseCache,
): Promise<void> => {
await fs.mkdir(storagePath, { recursive: true });
const cachePath = path.join(storagePath, CACHE_FILENAME);
const tmpPath = `${cachePath}.tmp`;
const out: ParseCacheFile = {
version: cache.version,
entries: Object.fromEntries(cache.entries),
};
// Compact JSON; this file can be tens of MB on a large repo and pretty-
// printing roughly doubles size for no value.
await fs.writeFile(tmpPath, JSON.stringify(out), 'utf-8');
await fs.rename(tmpPath, cachePath);
};
/**
* Drop entries whose hashes are not in `usedHashes`. Called at the end
* of a run so chunks that no longer correspond to any current chunk
* don't keep their stale entries forever.
*/
export const pruneCache = (cache: ParseCache, usedHashes: ReadonlySet<string>): number => {
let removed = 0;
for (const k of cache.entries.keys()) {
if (!usedHashes.has(k)) {
cache.entries.delete(k);
removed++;
}
}
return removed;
};
const emptyCache = (): ParseCache => ({
version: PARSE_CACHE_VERSION,
entries: new Map<string, ParseWorkerResult[]>(),
});