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Copy pathsubprocess.ts
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118 lines (99 loc) · 2.73 KB
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import { spawn as nodeSpawn } from "node:child_process";
export interface SpawnOptions {
cmd: string;
args: string[];
env?: Record<string, string>;
input?: string;
timeout?: number;
cwd?: string;
stdio?: ("pipe" | "ignore" | "inherit")[];
onStdout?: (chunk: string) => void;
onStderr?: (chunk: string) => void;
}
export interface SpawnResult {
stdout: string;
stderr: string;
exitCode: number;
durationMs: number;
}
/**
* Spawn a subprocess with streaming callbacks and buffered results
*/
export async function spawn(options: SpawnOptions): Promise<SpawnResult> {
const { cmd, args, env, input, timeout, cwd, stdio, onStdout, onStderr } = options;
const startTime = Date.now();
let stdoutBuffer = "";
let stderrBuffer = "";
return new Promise((resolve, reject) => {
// security: caller must provide complete env object, not merged with process.env
const child = nodeSpawn(cmd, args, {
env: env || {
PATH: process.env.PATH || "",
HOME: process.env.HOME || "",
},
stdio: stdio || ["pipe", "pipe", "pipe"],
cwd: cwd || process.cwd(),
});
let timeoutId: NodeJS.Timeout | undefined;
let isTimedOut = false;
if (timeout) {
timeoutId = setTimeout(() => {
isTimedOut = true;
child.kill("SIGTERM");
setTimeout(() => {
if (!child.killed) {
child.kill("SIGKILL");
}
}, 5000);
}, timeout);
}
if (child.stdout) {
child.stdout.on("data", (data: Buffer) => {
const chunk = data.toString();
stdoutBuffer += chunk;
onStdout?.(chunk);
});
}
if (child.stderr) {
child.stderr.on("data", (data: Buffer) => {
const chunk = data.toString();
stderrBuffer += chunk;
onStderr?.(chunk);
});
}
child.on("close", (exitCode) => {
const durationMs = Date.now() - startTime;
if (timeoutId) {
clearTimeout(timeoutId);
}
if (isTimedOut) {
reject(new Error(`Process timed out after ${timeout}ms`));
return;
}
resolve({
stdout: stdoutBuffer,
stderr: stderrBuffer,
exitCode: exitCode || 0,
durationMs,
});
});
child.on("error", (error) => {
const durationMs = Date.now() - startTime;
if (timeoutId) {
clearTimeout(timeoutId);
}
// log spawn errors for debugging
console.error(`[spawn] Process spawn error: ${error.message}`);
resolve({
stdout: stdoutBuffer,
stderr: stderrBuffer,
exitCode: 1,
durationMs,
});
});
if (input && child.stdin && stdio?.[0] !== "ignore") {
child.stdin.write(input);
child.stdin.end();
}
});
}