mirror of
https://github.com/alkimake/paperclip.git
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Serialize sandbox callback bridge against concurrent heartbeats (#5326)
> **Stacked PR.** This PR's branch carries cumulative content from #5324 (bridge allowlist expand) and #5325 (env sanitization) — the mutex/sha256 logic in this PR sits on top of both. Reviewers should focus on the files this PR's commit touches: `packages/adapter-utils/src/sandbox-callback-bridge.{ts,test.ts}`, `packages/adapter-utils/src/ssh.ts`, and `packages/adapter-utils/src/ssh-fixture.test.ts`. Will rebase onto `master` and force-push once both prerequisite PRs are merged. ## Thinking Path > - Paperclip orchestrates AI agents for zero-human companies > - Each agent that runs in a sandbox or via SSH talks back to the Paperclip server through a per-lease callback bridge whose entrypoint script is uploaded to the remote > - When two heartbeats target the same agent on the same machine concurrently, both upload the bridge entrypoint and both write to the same response files — producing torn-write races: `SyntaxError: Identifier 'randomUUID' has already been declared` from a concatenated upload, `mv: cannot stat …` from colliding `.json.tmp` writes, and 0-byte commits from a truncated stdin > - This pull request serializes those operations with a POSIX `mkdir`-mutex (PID liveness check + atomic rename) at the bridge entrypoint upload, applies the same lock to the bridge response writer, forwards stdin into remote ssh commands so the entrypoint payload arrives intact, and verifies a sha256 of the upload before promoting it > - The benefit is concurrent heartbeats no longer corrupt each other's bridge state ## What Changed - `packages/adapter-utils/src/sandbox-callback-bridge.ts`: serialize entrypoint upload and response writes via POSIX `mkdir`-mutex with PID liveness; sha256 the upload before promoting via `mv`; content-skip when the existing entrypoint already matches - `packages/adapter-utils/src/ssh.ts`: forward stdin into remote ssh commands through the SSH managed runtime so `cat > "$remote_upload"` actually receives the base64-encoded entrypoint - `packages/adapter-utils/src/ssh-fixture.test.ts`: cover the stdin-forwarded SSH path - `packages/adapter-utils/src/sandbox-callback-bridge.test.ts`: cover the mutex, content-skip, sha256-verify, and atomic-rename paths ## Verification - `pnpm vitest run --no-coverage --project @paperclipai/adapter-utils` - `pnpm typecheck` clean - Manual: two parallel heartbeats targeting the same SSH agent no longer race on the bridge entrypoint or response files ## Risks Medium. Serializing previously-parallel operations adds latency on the contended path (one heartbeat waits on another), bounded by the entrypoint upload time. The mutex includes PID liveness so a crashed heartbeat doesn't deadlock subsequent ones. Sha256-verify gives a clear "torn upload" failure mode instead of silent 0-byte commits. ## Model Used Claude Opus 4.7 (1M context) ## Checklist - [x] I have included a thinking path that traces from project context to this change - [x] I have specified the model used (with version and capability details) - [x] I have checked ROADMAP.md and confirmed this PR does not duplicate planned core work - [x] I have run tests locally and they pass - [x] I have added or updated tests where applicable — tests cover mutex + sha256-verify + stdin-forwarded ssh - [x] If this change affects the UI, I have included before/after screenshots — N/A (no UI) - [x] I have updated relevant documentation to reflect my changes - [x] I have considered and documented any risks above - [x] I will address all Greptile and reviewer comments before requesting merge
This commit is contained in:
Devin Foley
GitHub
parent
f6bad8f6bf
commit
50db8c01d2
4 changed files with 633 additions and 16 deletions
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@ -1,4 +1,4 @@
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import { randomBytes, randomUUID } from "node:crypto";
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import { createHash, randomBytes, randomUUID } from "node:crypto";
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import { promises as fs } from "node:fs";
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import os from "node:os";
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import path from "node:path";
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@ -145,6 +145,13 @@ export interface SandboxCallbackBridgeQueueClient {
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listJsonFiles(remotePath: string): Promise<string[]>;
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readTextFile(remotePath: string): Promise<string>;
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writeTextFile(remotePath: string, body: string): Promise<void>;
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writeResponseFile?(
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responsePath: string,
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body: string,
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options?: {
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requestPath?: string | null;
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},
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): Promise<{ wrote: boolean }>;
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rename(fromPath: string, toPath: string): Promise<void>;
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remove(remotePath: string): Promise<void>;
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}
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@ -196,12 +203,14 @@ async function runShell(
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script: string,
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timeoutMs: number,
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shellCommand: "bash" | "sh" = "sh",
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stdin?: string,
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): Promise<RunProcessResult> {
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return await runner.execute({
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command: shellCommand,
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args: ["-lc", script],
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cwd,
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timeoutMs,
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stdin,
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});
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}
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@ -218,6 +227,43 @@ function base64Chunks(body: string): string[] {
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return out;
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}
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async function pathExists(filePath: string): Promise<boolean> {
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return await fs.stat(filePath).then(() => true).catch(() => false);
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}
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function buildRemotePidLockAcquireScript(lockDirExpr: string, timeoutMessage: string): string[] {
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return [
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"attempts=0",
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`while ! mkdir ${lockDirExpr} 2>/dev/null; do`,
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" holder_pid=\"\"",
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` if [ -s ${lockDirExpr}/pid ]; then`,
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` holder_pid="$(cat ${lockDirExpr}/pid 2>/dev/null || true)"`,
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" fi",
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" if [ -n \"$holder_pid\" ] && ! kill -0 \"$holder_pid\" 2>/dev/null; then",
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` rm -rf ${lockDirExpr}`,
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" continue",
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" fi",
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" attempts=$((attempts + 1))",
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" if [ \"$attempts\" -ge 600 ]; then",
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` echo ${shellQuote(timeoutMessage)} >&2`,
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" exit 1",
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" fi",
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" sleep 0.05",
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"done",
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`printf '%s\\n' "$$" > ${lockDirExpr}/pid`,
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];
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}
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function buildRemotePidLockCleanupScript(lockDirExpr: string, cleanupLines: string[]): string[] {
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return [
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"cleanup() {",
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...cleanupLines.map((line) => ` ${line}`),
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` rm -rf ${lockDirExpr}`,
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"}",
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"trap cleanup EXIT INT TERM",
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];
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}
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export function createSandboxCallbackBridgeToken(bytes = DEFAULT_BRIDGE_TOKEN_BYTES): string {
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return randomBytes(bytes).toString("base64url");
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}
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@ -315,6 +361,80 @@ export function createFileSystemSandboxCallbackBridgeQueueClient(): SandboxCallb
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await fs.mkdir(path.posix.dirname(remotePath), { recursive: true });
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await fs.writeFile(remotePath, body, "utf8");
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},
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writeResponseFile: async (responsePath, body, options = {}) => {
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const responseDir = path.posix.dirname(responsePath);
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const tempPath = `${responsePath}.tmp`;
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const lockDir = `${responsePath}.paperclip-write.lock`;
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const lockPidFile = `${lockDir}/pid`;
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if (options.requestPath) {
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const requestExists = await pathExists(options.requestPath);
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if (!requestExists) {
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return { wrote: false };
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}
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}
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await fs.mkdir(responseDir, { recursive: true });
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// PID-liveness mkdir-mutex: mirrors the shell-based bridge mutex so a
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// crashed holder (SIGKILL / OOM) doesn't deadlock subsequent writers
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// for the full timeout window.
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let attempts = 0;
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while (true) {
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try {
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await fs.mkdir(lockDir);
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await fs.writeFile(lockPidFile, `${process.pid}\n`, "utf8");
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break;
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} catch (error) {
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const code = (error as NodeJS.ErrnoException)?.code;
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if (code !== "EEXIST") {
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throw error;
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}
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let holderPid: number | null = null;
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try {
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const raw = await fs.readFile(lockPidFile, "utf8");
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const parsed = Number.parseInt(raw.trim(), 10);
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if (Number.isFinite(parsed) && parsed > 0) holderPid = parsed;
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} catch {
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// pid file missing or unreadable — treat as stale lock
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}
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let holderAlive = false;
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if (holderPid !== null) {
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try {
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process.kill(holderPid, 0);
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holderAlive = true;
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} catch {
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holderAlive = false;
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}
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}
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if (!holderAlive) {
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await fs.rm(lockDir, { recursive: true, force: true }).catch(() => undefined);
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continue;
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}
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attempts += 1;
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if (attempts >= 600) {
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throw new Error("Timed out acquiring sandbox callback bridge response lock.");
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}
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await new Promise((resolve) => setTimeout(resolve, 50));
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}
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}
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try {
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if (options.requestPath) {
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const requestExists = await pathExists(options.requestPath);
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if (!requestExists) {
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return { wrote: false };
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}
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}
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const responseExists = await pathExists(responsePath);
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if (responseExists) {
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return { wrote: false };
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}
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await fs.writeFile(tempPath, body, "utf8");
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await fs.rename(tempPath, responsePath);
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return { wrote: true };
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} finally {
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await fs.rm(tempPath, { force: true }).catch(() => undefined);
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await fs.rm(lockDir, { recursive: true, force: true }).catch(() => undefined);
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}
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},
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rename: async (fromPath, toPath) => {
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await fs.mkdir(path.posix.dirname(toPath), { recursive: true });
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await fs.rename(fromPath, toPath);
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@ -385,6 +505,53 @@ export function createCommandManagedSandboxCallbackBridgeQueueClient(input: {
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`base64 -d < ${shellQuote(tempPath)} > ${shellQuote(remotePath)} && rm -f ${shellQuote(tempPath)}`,
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);
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},
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writeResponseFile: async (responsePath, body, options = {}) => {
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const responseDir = path.posix.dirname(responsePath);
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const tempPath = `${responsePath}.tmp`;
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const lockDir = `${responsePath}.paperclip-write.lock`;
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const requestPath = options.requestPath?.trim() || "";
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const result = await runShell(
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input.runner,
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input.remoteCwd,
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[
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"set -eu",
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`response_dir=${shellQuote(responseDir)}`,
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`response_path=${shellQuote(responsePath)}`,
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`temp_path=${shellQuote(tempPath)}`,
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`lock_dir=${shellQuote(lockDir)}`,
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`request_path=${shellQuote(requestPath)}`,
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"mkdir -p \"$response_dir\"",
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...buildRemotePidLockAcquireScript("\"$lock_dir\"", "Timed out acquiring sandbox callback bridge response lock."),
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...buildRemotePidLockCleanupScript("\"$lock_dir\"", [
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"rm -f \"$temp_path\"",
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]),
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"if [ -n \"$request_path\" ] && [ ! -f \"$request_path\" ]; then",
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" printf '{\"wrote\":false}\\n'",
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" exit 0",
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"fi",
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"if [ -f \"$response_path\" ]; then",
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" printf '{\"wrote\":false}\\n'",
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" exit 0",
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"fi",
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"cat > \"$temp_path\"",
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"mv \"$temp_path\" \"$response_path\"",
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"printf '{\"wrote\":true}\\n'",
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].join("\n"),
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timeoutMs,
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shellCommand,
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body,
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);
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requireSuccessfulResult(`write bridge response ${responsePath}`, result);
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try {
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return {
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wrote: JSON.parse(result.stdout.trim())?.wrote === true,
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};
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} catch (error) {
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throw new Error(
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`Sandbox callback bridge response write wrote invalid result JSON: ${error instanceof Error ? error.message : String(error)}`,
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);
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}
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},
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rename: async (fromPath, toPath) => {
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await runChecked(
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`rename ${fromPath}`,
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@ -399,11 +566,17 @@ export function createCommandManagedSandboxCallbackBridgeQueueClient(input: {
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async function writeBridgeResponse(
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client: SandboxCallbackBridgeQueueClient,
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requestPath: string,
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responsePath: string,
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response: SandboxCallbackBridgeResponse,
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) {
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const body = `${JSON.stringify(response)}\n`;
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if (client.writeResponseFile) {
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await client.writeResponseFile(responsePath, body, { requestPath });
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return;
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}
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const tempPath = `${responsePath}.tmp`;
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await client.writeTextFile(tempPath, `${JSON.stringify(response)}\n`);
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await client.writeTextFile(tempPath, body);
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await client.rename(tempPath, responsePath);
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}
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@ -447,7 +620,7 @@ export async function startSandboxCallbackBridgeWorker(input: {
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request = JSON.parse(raw) as SandboxCallbackBridgeRequest;
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} catch {
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const requestId = fileName.replace(/\.json$/i, "") || randomUUID();
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await writeBridgeResponse(input.client, responsePath, {
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await writeBridgeResponse(input.client, requestPath, responsePath, {
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id: requestId,
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status: 400,
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headers: { "content-type": "application/json" },
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@ -460,7 +633,7 @@ export async function startSandboxCallbackBridgeWorker(input: {
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const denialReason = await authorizeRequest(request);
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if (denialReason) {
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await writeBridgeResponse(input.client, responsePath, {
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await writeBridgeResponse(input.client, requestPath, responsePath, {
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id: request.id,
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status: 403,
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headers: { "content-type": "application/json" },
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@ -477,7 +650,7 @@ export async function startSandboxCallbackBridgeWorker(input: {
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if (Buffer.byteLength(responseBody, "utf8") > maxBodyBytes) {
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throw new Error(`Bridge response body exceeded the configured size limit of ${maxBodyBytes} bytes.`);
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}
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await writeBridgeResponse(input.client, responsePath, {
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await writeBridgeResponse(input.client, requestPath, responsePath, {
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id: request.id,
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status: result.status,
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headers: result.headers ?? {},
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@ -488,7 +661,7 @@ export async function startSandboxCallbackBridgeWorker(input: {
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console.warn(
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`[paperclip] sandbox callback bridge handler failed for ${request.id}: ${error instanceof Error ? error.message : String(error)}`,
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);
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await writeBridgeResponse(input.client, responsePath, {
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await writeBridgeResponse(input.client, requestPath, responsePath, {
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id: request.id,
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status: 502,
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headers: { "content-type": "application/json" },
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@ -511,7 +684,7 @@ export async function startSandboxCallbackBridgeWorker(input: {
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try {
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const raw = await input.client.readTextFile(requestPath);
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const parsed = JSON.parse(raw) as Partial<SandboxCallbackBridgeRequest>;
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await writeBridgeResponse(input.client, responsePath, {
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await writeBridgeResponse(input.client, requestPath, responsePath, {
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id: typeof parsed.id === "string" && parsed.id.length > 0 ? parsed.id : requestId,
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status: 503,
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headers: { "content-type": "application/json" },
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@ -578,6 +751,99 @@ export async function startSandboxCallbackBridgeWorker(input: {
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};
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}
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export async function syncSandboxCallbackBridgeEntrypoint(input: {
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runner: CommandManagedRuntimeRunner;
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remoteCwd: string;
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assetRemoteDir: string;
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bridgeAsset: SandboxCallbackBridgeAsset;
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timeoutMs?: number | null;
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shellCommand?: "bash" | "sh" | null;
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}): Promise<{ remoteEntrypoint: string; sha256: string; uploaded: boolean }> {
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const timeoutMs = normalizeTimeoutMs(input.timeoutMs, DEFAULT_BRIDGE_RESPONSE_TIMEOUT_MS);
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const shellCommand = preferredShellForSandbox(input.shellCommand);
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const remoteEntrypoint = path.posix.join(input.assetRemoteDir, SANDBOX_CALLBACK_BRIDGE_ENTRYPOINT);
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const remoteEntrypointPartial = `${remoteEntrypoint}.partial`;
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const remoteUploadPath = `${remoteEntrypoint}.paperclip-upload.b64`;
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const remoteLockDir = path.posix.join(input.assetRemoteDir, ".paperclip-bridge-upload.lock");
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const entrypointSource = await fs.readFile(input.bridgeAsset.entrypoint, "utf8");
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const entrypointBase64 = toBuffer(Buffer.from(entrypointSource, "utf8")).toString("base64");
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const sha256 = createHash("sha256").update(entrypointSource, "utf8").digest("hex");
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const syncResult = await runShell(
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input.runner,
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input.remoteCwd,
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[
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"set -eu",
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`remote_dir=${shellQuote(input.assetRemoteDir)}`,
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`remote_path=${shellQuote(remoteEntrypoint)}`,
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`remote_partial=${shellQuote(remoteEntrypointPartial)}`,
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`remote_upload=${shellQuote(remoteUploadPath)}`,
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`lock_dir=${shellQuote(remoteLockDir)}`,
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`expected_sha=${shellQuote(sha256)}`,
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"hash_file() {",
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" if command -v sha256sum >/dev/null 2>&1; then",
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" sha256sum \"$1\" | awk '{print $1}'",
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" return 0",
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" fi",
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" if command -v shasum >/dev/null 2>&1; then",
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" shasum -a 256 \"$1\" | awk '{print $1}'",
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" return 0",
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" fi",
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" return 127",
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"}",
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"mkdir -p \"$remote_dir\"",
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...buildRemotePidLockAcquireScript("\"$lock_dir\"", "Timed out acquiring sandbox callback bridge upload lock."),
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...buildRemotePidLockCleanupScript("\"$lock_dir\"", [
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"rm -f \"$remote_upload\" \"$remote_partial\"",
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]),
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"current_sha=\"\"",
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"if [ -f \"$remote_path\" ]; then",
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" current_sha=\"$(hash_file \"$remote_path\" 2>/dev/null)\" || current_sha=\"\"",
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"fi",
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"if [ -n \"$current_sha\" ] && [ \"$current_sha\" = \"$expected_sha\" ]; then",
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" printf '{\"uploaded\":false}\\n'",
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" exit 0",
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"fi",
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"rm -f \"$remote_upload\" \"$remote_partial\"",
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"cat > \"$remote_upload\"",
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"base64 -d < \"$remote_upload\" > \"$remote_partial\"",
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// Verify upload integrity. If neither sha256sum nor shasum is on PATH
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// (minimal Alpine/scratch images), surface the missing-tool error
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// instead of a misleading "sha mismatch" — the verify step is then
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// best-effort and we trust base64-decode + atomic rename below.
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"if partial_sha=\"$(hash_file \"$remote_partial\" 2>/dev/null)\"; then",
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" if [ \"$partial_sha\" != \"$expected_sha\" ]; then",
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" echo \"Sandbox callback bridge entrypoint upload sha mismatch.\" >&2",
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" exit 1",
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" fi",
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"else",
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" echo \"Sandbox callback bridge entrypoint sha verify skipped: no sha256sum/shasum on remote.\" >&2",
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"fi",
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"mv \"$remote_partial\" \"$remote_path\"",
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"printf '{\"uploaded\":true}\\n'",
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].join("\n"),
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timeoutMs,
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shellCommand,
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entrypointBase64,
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);
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requireSuccessfulResult("sync sandbox callback bridge entrypoint", syncResult);
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let uploaded = false;
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try {
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uploaded = JSON.parse(syncResult.stdout.trim())?.uploaded === true;
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} catch (error) {
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throw new Error(
|
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`Sandbox callback bridge sync wrote invalid result JSON: ${error instanceof Error ? error.message : String(error)}`,
|
||||
);
|
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}
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|
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return {
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remoteEntrypoint,
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sha256,
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uploaded,
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};
|
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}
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|
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export async function startSandboxCallbackBridgeServer(input: {
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runner: CommandManagedRuntimeRunner;
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remoteCwd: string;
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|
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@ -598,17 +864,17 @@ export async function startSandboxCallbackBridgeServer(input: {
|
|||
const timeoutMs = normalizeTimeoutMs(input.timeoutMs, DEFAULT_BRIDGE_RESPONSE_TIMEOUT_MS);
|
||||
const shellCommand = preferredShellForSandbox(input.shellCommand);
|
||||
const directories = sandboxCallbackBridgeDirectories(input.queueDir);
|
||||
const remoteEntrypoint = path.posix.join(input.assetRemoteDir, SANDBOX_CALLBACK_BRIDGE_ENTRYPOINT);
|
||||
let remoteEntrypoint = path.posix.join(input.assetRemoteDir, SANDBOX_CALLBACK_BRIDGE_ENTRYPOINT);
|
||||
if (input.bridgeAsset) {
|
||||
const assetClient = createCommandManagedSandboxCallbackBridgeQueueClient({
|
||||
const assetSync = await syncSandboxCallbackBridgeEntrypoint({
|
||||
runner: input.runner,
|
||||
remoteCwd: input.remoteCwd,
|
||||
assetRemoteDir: input.assetRemoteDir,
|
||||
bridgeAsset: input.bridgeAsset,
|
||||
timeoutMs,
|
||||
shellCommand,
|
||||
});
|
||||
await assetClient.makeDir(input.assetRemoteDir);
|
||||
const entrypointSource = await fs.readFile(input.bridgeAsset.entrypoint, "utf8");
|
||||
await assetClient.writeTextFile(remoteEntrypoint, entrypointSource);
|
||||
remoteEntrypoint = assetSync.remoteEntrypoint;
|
||||
}
|
||||
const env = buildSandboxCallbackBridgeEnv({
|
||||
queueDir: input.queueDir,
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue