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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
import { File } from "./files.ts";
import { close } from "./ops/resources.ts";
import { ReadCloser, WriteCloser } from "./io.ts";
import { readAll } from "./buffer.ts";
import { kill, runStatus as runStatusOp, run as runOp } from "./ops/process.ts";
/** How to handle subprocess stdio.
*
* "inherit" The default if unspecified. The child inherits from the
* corresponding parent descriptor.
*
* "piped" A new pipe should be arranged to connect the parent and child
* subprocesses.
*
* "null" This stream will be ignored. This is the equivalent of attaching the
* stream to /dev/null.
*/
export type ProcessStdio = "inherit" | "piped" | "null";
// TODO Maybe extend VSCode's 'CommandOptions'?
// See https://code.visualstudio.com/docs/editor/tasks-appendix#_schema-for-tasksjson
export interface RunOptions {
args: string[];
cwd?: string;
env?: { [key: string]: string };
stdout?: ProcessStdio | number;
stderr?: ProcessStdio | number;
stdin?: ProcessStdio | number;
}
async function runStatus(rid: number): Promise<ProcessStatus> {
const res = await runStatusOp(rid);
if (res.gotSignal) {
const signal = res.exitSignal;
return { signal, success: false };
} else {
const code = res.exitCode;
return { code, success: code === 0 };
}
}
export class Process {
readonly rid: number;
readonly pid: number;
readonly stdin?: WriteCloser;
readonly stdout?: ReadCloser;
readonly stderr?: ReadCloser;
// @internal
constructor(res: RunResponse) {
this.rid = res.rid;
this.pid = res.pid;
if (res.stdinRid && res.stdinRid > 0) {
this.stdin = new File(res.stdinRid);
}
if (res.stdoutRid && res.stdoutRid > 0) {
this.stdout = new File(res.stdoutRid);
}
if (res.stderrRid && res.stderrRid > 0) {
this.stderr = new File(res.stderrRid);
}
}
async status(): Promise<ProcessStatus> {
return await runStatus(this.rid);
}
/** Buffer the stdout and return it as Uint8Array after EOF.
* You must set stdout to "piped" when creating the process.
* This calls close() on stdout after its done.
*/
async output(): Promise<Uint8Array> {
if (!this.stdout) {
throw new Error("Process.output: stdout is undefined");
}
try {
return await readAll(this.stdout);
} finally {
this.stdout.close();
}
}
/** Buffer the stderr and return it as Uint8Array after EOF.
* You must set stderr to "piped" when creating the process.
* This calls close() on stderr after its done.
*/
async stderrOutput(): Promise<Uint8Array> {
if (!this.stderr) {
throw new Error("Process.stderrOutput: stderr is undefined");
}
try {
return await readAll(this.stderr);
} finally {
this.stderr.close();
}
}
close(): void {
close(this.rid);
}
kill(signo: number): void {
kill(this.pid, signo);
}
}
export interface ProcessStatus {
success: boolean;
code?: number;
signal?: number; // TODO: Make this a string, e.g. 'SIGTERM'.
}
function isRid(arg: unknown): arg is number {
return !isNaN(arg as number);
}
interface RunResponse {
rid: number;
pid: number;
stdinRid: number | null;
stdoutRid: number | null;
stderrRid: number | null;
}
/**
* Spawns new subprocess.
*
* Subprocess uses same working directory as parent process unless `opt.cwd`
* is specified.
*
* Environmental variables for subprocess can be specified using `opt.env`
* mapping.
*
* By default subprocess inherits stdio of parent process. To change that
* `opt.stdout`, `opt.stderr` and `opt.stdin` can be specified independently -
* they can be set to either `ProcessStdio` or `rid` of open file.
*/
export function run({
args,
cwd = undefined,
env = {},
stdout = "inherit",
stderr = "inherit",
stdin = "inherit"
}: RunOptions): Process {
const res = runOp({
args: args.map(String),
cwd,
env: Object.entries(env),
stdin: isRid(stdin) ? "" : stdin,
stdout: isRid(stdout) ? "" : stdout,
stderr: isRid(stderr) ? "" : stderr,
stdinRid: isRid(stdin) ? stdin : 0,
stdoutRid: isRid(stdout) ? stdout : 0,
stderrRid: isRid(stderr) ? stderr : 0
}) as RunResponse;
return new Process(res);
}
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