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// Copyright 2018 the Deno authors. All rights reserved. MIT license.
import * as dispatch from "./dispatch";
import * as flatbuffers from "./flatbuffers";
import * as msg from "gen/msg_generated";
import { assert, unreachable } from "./util";
import { close, File } from "./files";
import { ReadCloser, WriteCloser } from "./io";
/** How to handle subsubprocess 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'?
// tslint:disable-next-line:max-line-length
// See https://code.visualstudio.com/docs/editor/tasks-appendix#_schema-for-tasksjson
export interface RunOptions {
args: string[];
cwd?: string;
stdout?: ProcessStdio;
stderr?: ProcessStdio;
stdin?: ProcessStdio;
}
export class Process {
readonly rid: number;
readonly pid: number;
readonly stdin?: WriteCloser;
readonly stdout?: ReadCloser;
readonly stderr?: ReadCloser;
// @internal
constructor(res: msg.RunRes) {
this.rid = res.rid();
this.pid = res.pid();
if (res.stdinRid() > 0) {
this.stdin = new File(res.stdinRid());
}
if (res.stdoutRid() > 0) {
this.stdout = new File(res.stdoutRid());
}
if (res.stderrRid() > 0) {
this.stderr = new File(res.stderrRid());
}
}
async status(): Promise<ProcessStatus> {
return await runStatus(this.rid);
}
close(): void {
close(this.rid);
}
}
export interface ProcessStatus {
success: boolean;
code?: number;
signal?: number; // TODO: Make this a string, e.g. 'SIGTERM'.
}
function stdioMap(s: ProcessStdio): msg.ProcessStdio {
switch (s) {
case "inherit":
return msg.ProcessStdio.Inherit;
case "piped":
return msg.ProcessStdio.Piped;
case "null":
return msg.ProcessStdio.Null;
default:
return unreachable();
}
}
export function run(opt: RunOptions): Process {
const builder = flatbuffers.createBuilder();
const argsOffset = msg.Run.createArgsVector(
builder,
opt.args.map(a => builder.createString(a))
);
const cwdOffset = opt.cwd == null ? -1 : builder.createString(opt.cwd);
msg.Run.startRun(builder);
msg.Run.addArgs(builder, argsOffset);
if (opt.cwd != null) {
msg.Run.addCwd(builder, cwdOffset);
}
if (opt.stdin) {
msg.Run.addStdin(builder, stdioMap(opt.stdin!));
}
if (opt.stdout) {
msg.Run.addStdout(builder, stdioMap(opt.stdout!));
}
if (opt.stderr) {
msg.Run.addStderr(builder, stdioMap(opt.stderr!));
}
const inner = msg.Run.endRun(builder);
const baseRes = dispatch.sendSync(builder, msg.Any.Run, inner);
assert(baseRes != null);
assert(msg.Any.RunRes === baseRes!.innerType());
const res = new msg.RunRes();
assert(baseRes!.inner(res) != null);
return new Process(res);
}
async function runStatus(rid: number): Promise<ProcessStatus> {
const builder = flatbuffers.createBuilder();
msg.RunStatus.startRunStatus(builder);
msg.RunStatus.addRid(builder, rid);
const inner = msg.RunStatus.endRunStatus(builder);
const baseRes = await dispatch.sendAsync(builder, msg.Any.RunStatus, inner);
assert(baseRes != null);
assert(msg.Any.RunStatusRes === baseRes!.innerType());
const res = new msg.RunStatusRes();
assert(baseRes!.inner(res) != null);
if (res.gotSignal()) {
const signal = res.exitSignal();
return { signal, success: false };
} else {
const code = res.exitCode();
return { code, success: code === 0 };
}
}
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