@struktoai/mirage-core/dist/process/child.js

A Unified Virtual Filesystem For AI Agents

import { PipeClosed } from "../shell/errors.js";
import { materialize } from "../io/types.js";
/** Streams belong to one consumer; communicate drains both outputs concurrently. */
export class ChildProcess {
    process;
    stdin;
    output;
    cancel;
    stdout;
    stderr;
    constructor(process, stdin, output, cancel) {
        this.process = process;
        this.stdin = stdin;
        this.output = output;
        this.cancel = cancel;
        void process.join().then(() => {
            stdin.stop();
            output.end();
        });
        this.stdout = output.stdout.stream();
        this.stderr = output.stderr.stream();
    }
    get pid() {
        return this.process.info.pid;
    }
    closeOutput(stream) {
        this.output[stream].stop();
    }
    poll() {
        return this.process.info.exitCode;
    }
    /**
     * Stop the child with `signal`; its status is 128 plus it.
     *
     * @param signal what the stop stands for, KILL (9) unless the caller
     *   names another (`Popen.terminate` sends TERM).
     */
    terminate(signal = 9) {
        this.cancel(signal);
    }
    wait() {
        return this.process.join();
    }
    async communicate(data = new Uint8Array()) {
        const feed = async () => {
            try {
                await this.stdin.write(data);
            }
            catch (error) {
                if (!(error instanceof PipeClosed))
                    throw error;
            }
            finally {
                this.stdin.close();
            }
        };
        try {
            const [, stdout, stderr, info] = await Promise.all([
                feed(),
                materialize(this.stdout),
                materialize(this.stderr),
                this.wait(),
            ]);
            return { stdout, stderr, exitCode: info.exitCode ?? 1 };
        }
        catch (error) {
            this.terminate();
            throw error;
        }
    }
}
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