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proc.ts
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140 lines (122 loc) · 5.69 KB
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// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License.
// tslint:disable:no-any
import { spawn } from 'child_process';
import { Observable } from 'rxjs/Observable';
import { Disposable } from 'vscode';
import { createDeferred } from '../helpers';
import { EnvironmentVariables } from '../variables/types';
import { DEFAULT_ENCODING } from './constants';
import { ExecutionResult, IBufferDecoder, IProcessService, ObservableExecutionResult, Output, SpawnOptions, StdErrError } from './types';
export class ProcessService implements IProcessService {
constructor(private readonly decoder: IBufferDecoder, private readonly env?: EnvironmentVariables) { }
public execObservable(file: string, args: string[], options: SpawnOptions = {}): ObservableExecutionResult<string> {
const encoding = options.encoding = typeof options.encoding === 'string' && options.encoding.length > 0 ? options.encoding : DEFAULT_ENCODING;
delete options.encoding;
const spawnOptions = { ...options };
if (!spawnOptions.env || Object.keys(spawnOptions).length === 0) {
const env = this.env ? this.env : process.env;
spawnOptions.env = { ...env };
}
// Always ensure we have unbuffered output.
spawnOptions.env.PYTHONUNBUFFERED = '1';
if (!spawnOptions.env.PYTHONIOENCODING) {
spawnOptions.env.PYTHONIOENCODING = 'utf-8';
}
const proc = spawn(file, args, spawnOptions);
let procExited = false;
const output = new Observable<Output<string>>(subscriber => {
const disposables: Disposable[] = [];
const on = (ee: NodeJS.EventEmitter, name: string, fn: Function) => {
ee.on(name, fn as any);
disposables.push({ dispose: () => ee.removeListener(name, fn as any) });
};
if (options.token) {
disposables.push(options.token.onCancellationRequested(() => {
if (!procExited && !proc.killed) {
proc.kill();
procExited = true;
}
}));
}
const sendOutput = (source: 'stdout' | 'stderr', data: Buffer) => {
const out = this.decoder.decode([data], encoding);
if (source === 'stderr' && options.throwOnStdErr) {
subscriber.error(new StdErrError(out));
} else {
subscriber.next({ source, out: out });
}
};
on(proc.stdout, 'data', (data: Buffer) => sendOutput('stdout', data));
on(proc.stderr, 'data', (data: Buffer) => sendOutput('stderr', data));
proc.once('close', () => {
procExited = true;
subscriber.complete();
disposables.forEach(disposable => disposable.dispose());
});
proc.once('error', ex => {
procExited = true;
subscriber.error(ex);
disposables.forEach(disposable => disposable.dispose());
});
});
return { proc, out: output };
}
public exec(file: string, args: string[], options: SpawnOptions = {}): Promise<ExecutionResult<string>> {
const encoding = options.encoding = typeof options.encoding === 'string' && options.encoding.length > 0 ? options.encoding : DEFAULT_ENCODING;
delete options.encoding;
const spawnOptions = { ...options };
if (!spawnOptions.env || Object.keys(spawnOptions).length === 0) {
const env = this.env ? this.env : process.env;
spawnOptions.env = { ...env };
}
// Always ensure we have unbuffered output.
spawnOptions.env.PYTHONUNBUFFERED = '1';
if (!spawnOptions.env.PYTHONIOENCODING) {
spawnOptions.env.PYTHONIOENCODING = 'utf-8';
}
const proc = spawn(file, args, spawnOptions);
const deferred = createDeferred<ExecutionResult<string>>();
const disposables: Disposable[] = [];
const on = (ee: NodeJS.EventEmitter, name: string, fn: Function) => {
ee.on(name, fn as any);
disposables.push({ dispose: () => ee.removeListener(name, fn as any) });
};
if (options.token) {
disposables.push(options.token.onCancellationRequested(() => {
if (!proc.killed && !deferred.completed) {
proc.kill();
}
}));
}
const stdoutBuffers: Buffer[] = [];
on(proc.stdout, 'data', (data: Buffer) => stdoutBuffers.push(data));
const stderrBuffers: Buffer[] = [];
on(proc.stderr, 'data', (data: Buffer) => {
if (options.mergeStdOutErr) {
stdoutBuffers.push(data);
stderrBuffers.push(data);
} else {
stderrBuffers.push(data);
}
});
proc.once('close', () => {
if (deferred.completed) {
return;
}
const stderr: string | undefined = stderrBuffers.length === 0 ? undefined : this.decoder.decode(stderrBuffers, encoding);
if (stderr && stderr.length > 0 && options.throwOnStdErr) {
deferred.reject(new StdErrError(stderr));
} else {
const stdout = this.decoder.decode(stdoutBuffers, encoding);
deferred.resolve({ stdout, stderr });
}
disposables.forEach(disposable => disposable.dispose());
});
proc.once('error', ex => {
deferred.reject(ex);
disposables.forEach(disposable => disposable.dispose());
});
return deferred.promise;
}
}