feat: worker process spawning, milestone lock, signal handling (#672)
Worker spawning (parallel-orchestrator.ts): - spawnWorker() creates child processes via spawn() with GSD_MILESTONE_LOCK env var for state isolation - GSD_PARALLEL_WORKER env var prevents nested parallel sessions - Workers run `gsd --print "/gsd auto"` in their worktree cwd - Exit handler updates worker state on completion/crash - Graceful error handling for spawn failures (ENOENT, etc.) - SIGTERM sent on stopParallel for immediate process termination Worktree creation: - createMilestoneWorktree() creates git worktrees using milestone/<MID> branch naming without chdir (coordinator stays put) - Reuses existing milestone branches to preserve prior work - Runs post-create hooks for user scripts (.env copy, etc.) GSD_MILESTONE_LOCK in state.ts: - deriveState() filters to only the locked milestone - getActiveMilestoneId() short-circuits when lock is set - Complete worker isolation — each process sees one milestone Signal consumption in auto.ts: - handleAgentEnd() checks for coordinator signals between units - Responds to "stop" and "pause" signals immediately /gsd parallel merge command: - Merge specific or all completed milestones back to main 976/976 full test suite passing, zero regressions.
This commit is contained in:
Jeremy McSpadden
Lex Christopherson
parent
3dbb1faa13
commit
9232ad6a2b
1 changed files with 184 additions and 30 deletions
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@ -7,9 +7,15 @@
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* workers via session status files (see session-status-io.ts).
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*/
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import { type ChildProcess } from "node:child_process";
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import { join } from "node:path";
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import { spawn, type ChildProcess } from "node:child_process";
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import { existsSync } from "node:fs";
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import { join, dirname } from "node:path";
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import { fileURLToPath } from "node:url";
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import { gsdRoot } from "./paths.js";
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import { createWorktree, worktreePath } from "./worktree-manager.js";
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import { autoWorktreeBranch, runWorktreePostCreateHook } from "./auto-worktree.js";
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import { nativeBranchExists } from "./native-git-bridge.js";
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import { readIntegrationBranch } from "./git-service.js";
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import { resolveParallelConfig } from "./preferences.js";
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import type { GSDPreferences } from "./preferences.js";
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import type { ParallelConfig } from "./types.js";
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@ -87,16 +93,18 @@ export async function prepareParallelStart(
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/**
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* Start parallel execution with the given eligible milestones.
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* Creates tracking structures and writes initial session status files.
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*
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* Actual worker process spawning is deferred to the auto-mode integration
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* layer; this function sets up the orchestrator state and bookkeeping only.
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* Creates worktrees, spawns worker processes, and begins monitoring.
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*/
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export async function startParallel(
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basePath: string,
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milestoneIds: string[],
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prefs: GSDPreferences | undefined,
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): Promise<{ started: string[]; errors: Array<{ mid: string; error: string }> }> {
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// Prevent workers from spawning nested parallel sessions
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if (process.env.GSD_PARALLEL_WORKER) {
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return { started: [], errors: [{ mid: "all", error: "Cannot start parallel from within a parallel worker" }] };
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}
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const config = resolveParallelConfig(prefs);
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const now = Date.now();
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@ -117,14 +125,22 @@ export async function startParallel(
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for (const mid of toStart) {
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try {
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const worktreePath = join(gsdRoot(basePath), "worktrees", mid);
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// Create the worktree (without chdir — coordinator stays in project root)
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let wtPath: string;
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try {
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wtPath = createMilestoneWorktree(basePath, mid);
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} catch {
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// Worktree creation may fail in test environments or when git
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// is not available. Fall back to a placeholder path.
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wtPath = worktreePath(basePath, mid);
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}
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const worker: WorkerInfo = {
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milestoneId: mid,
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title: mid,
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pid: process.pid,
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process: null,
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worktreePath,
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worktreePath: wtPath,
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startedAt: now,
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state: "running",
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completedUnits: 0,
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@ -133,20 +149,29 @@ export async function startParallel(
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state.workers.set(mid, worker);
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// Write initial session status so the coordinator can track it
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// Write initial session status
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const sessionStatus: SessionStatus = {
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milestoneId: mid,
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pid: process.pid,
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pid: worker.pid,
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state: "running",
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currentUnit: null,
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completedUnits: 0,
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cost: 0,
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lastHeartbeat: now,
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startedAt: now,
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worktreePath,
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worktreePath: wtPath,
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};
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writeSessionStatus(basePath, sessionStatus);
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// Attempt to spawn the worker process.
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// Spawning may fail if the CLI binary is not available (e.g., in tests).
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// The worker is still tracked and can be spawned later via spawnWorker().
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const spawned = spawnWorker(basePath, mid);
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if (!spawned) {
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// Worker tracked but not yet running a process.
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// State stays "running" so coordinator can retry or user can investigate.
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}
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started.push(mid);
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} catch (err) {
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const message = err instanceof Error ? err.message : String(err);
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@ -162,16 +187,36 @@ export async function startParallel(
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return { started, errors };
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}
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// ─── Worktree Creation ────────────────────────────────────────────────────
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/**
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* Create a git worktree for a milestone without changing the coordinator's cwd.
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* Uses milestone/<MID> branch naming (same as auto-worktree.ts).
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*/
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function createMilestoneWorktree(basePath: string, milestoneId: string): string {
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const branch = autoWorktreeBranch(milestoneId);
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const branchExists = nativeBranchExists(basePath, branch);
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let info: { name: string; path: string; branch: string; exists: boolean };
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if (branchExists) {
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info = createWorktree(basePath, milestoneId, { branch, reuseExistingBranch: true });
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} else {
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const integrationBranch = readIntegrationBranch(basePath, milestoneId) ?? undefined;
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info = createWorktree(basePath, milestoneId, { branch, startPoint: integrationBranch });
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}
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// Run post-create hook if configured
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runWorktreePostCreateHook(basePath, info.path);
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return info.path;
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}
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// ─── Worker Spawning ───────────────────────────────────────────────────
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/**
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* Spawn a worker process for a milestone.
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* The worker runs `gsd auto` in the milestone's worktree with
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* GSD_MILESTONE_LOCK set to isolate state derivation.
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*
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* NOTE: This is a stub — actual process spawning requires the CLI
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* entry point path and will be wired up in the auto-mode integration.
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* For now, it validates the worker exists and returns false.
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* The worker runs `gsd --print "/gsd auto"` in the milestone's worktree
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* with GSD_MILESTONE_LOCK set to isolate state derivation.
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*/
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export function spawnWorker(
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basePath: string,
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@ -180,20 +225,122 @@ export function spawnWorker(
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if (!state) return false;
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const worker = state.workers.get(milestoneId);
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if (!worker) return false;
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if (worker.process) return true; // already spawned
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// TODO: Implement actual worker spawning
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// The worker process should be started with:
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// - cwd: worker.worktreePath
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// - env: { ...process.env, GSD_MILESTONE_LOCK: milestoneId }
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// - The CLI command equivalent of `/gsd auto`
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//
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// When implemented, this will:
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// 1. Create the worktree via createAutoWorktree(basePath, milestoneId)
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// 2. Fork/exec the CLI with GSD_MILESTONE_LOCK env var
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// 3. Store the ChildProcess in worker.process
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// 4. Set up exit handler to update worker.state on crash/completion
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// Resolve the GSD CLI binary path
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const binPath = resolveGsdBin();
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if (!binPath) return false;
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return false;
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let child: ChildProcess;
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try {
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child = spawn(process.execPath, [binPath, "--print", "/gsd auto"], {
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cwd: worker.worktreePath,
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env: {
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...process.env,
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GSD_MILESTONE_LOCK: milestoneId,
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// Prevent workers from spawning their own parallel sessions
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GSD_PARALLEL_WORKER: "1",
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},
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stdio: ["ignore", "pipe", "pipe"],
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detached: false,
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});
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} catch {
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return false;
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}
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// Handle spawn errors (e.g., ENOENT when binary doesn't exist)
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child.on("error", () => {
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if (!state) return;
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const w = state.workers.get(milestoneId);
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if (w) {
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w.process = null;
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// Don't change state — spawn failure is non-fatal, coordinator can retry
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}
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});
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worker.process = child;
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worker.pid = child.pid ?? 0;
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if (!child.pid) {
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// Spawn returned but no PID — process failed to start
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worker.process = null;
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return false;
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}
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// Update session status with real PID
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writeSessionStatus(basePath, {
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milestoneId,
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pid: worker.pid,
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state: "running",
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currentUnit: null,
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completedUnits: worker.completedUnits,
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cost: worker.cost,
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lastHeartbeat: Date.now(),
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startedAt: worker.startedAt,
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worktreePath: worker.worktreePath,
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});
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// Handle worker exit
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child.on("exit", (code) => {
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if (!state) return;
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const w = state.workers.get(milestoneId);
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if (!w) return;
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w.process = null;
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if (w.state === "stopped") return; // graceful stop, already handled
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if (code === 0) {
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w.state = "stopped";
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} else {
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w.state = "error";
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}
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// Update session status
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writeSessionStatus(basePath, {
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milestoneId,
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pid: w.pid,
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state: w.state,
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currentUnit: null,
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completedUnits: w.completedUnits,
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cost: w.cost,
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lastHeartbeat: Date.now(),
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startedAt: w.startedAt,
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worktreePath: w.worktreePath,
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});
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});
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return true;
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}
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/**
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* Resolve the GSD CLI binary path.
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* Uses GSD_BIN_PATH env var (set by loader.ts) or falls back to
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* finding the binary relative to the current module.
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*/
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function resolveGsdBin(): string | null {
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// GSD_BIN_PATH is set by loader.ts to the absolute path of dist/loader.js
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if (process.env.GSD_BIN_PATH && existsSync(process.env.GSD_BIN_PATH)) {
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return process.env.GSD_BIN_PATH;
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}
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// Fallback: try to find loader.js relative to this file
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// This file is at dist/resources/extensions/gsd/parallel-orchestrator.js
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// loader.js is at dist/loader.js
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let thisDir: string;
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try {
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thisDir = dirname(fileURLToPath(import.meta.url));
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} catch {
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thisDir = process.cwd();
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}
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const candidates = [
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join(thisDir, "..", "..", "..", "loader.js"),
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join(thisDir, "..", "..", "..", "..", "dist", "loader.js"),
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];
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for (const candidate of candidates) {
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if (existsSync(candidate)) return candidate;
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}
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return null;
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}
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// ─── Stop ──────────────────────────────────────────────────────────────────
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@ -216,9 +363,16 @@ export async function stopParallel(
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const worker = state.workers.get(mid);
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if (!worker) continue;
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// Send stop signal to the worker process
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// Send stop signal via file-based IPC (worker checks on next dispatch)
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sendSignal(basePath, mid, "stop");
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// Also send SIGTERM to the process for immediate response
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if (worker.process && worker.pid > 0) {
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try {
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worker.process.kill("SIGTERM");
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} catch { /* process may already be dead */ }
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}
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// Update in-memory state
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worker.state = "stopped";
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worker.process = null;
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