TypeScript child_process.fork函数代码示例

function _spawnSharedProcess(options: ISharedProcessOptions): cp.ChildProcess {
	const execArgv = [];
	const env = assign({}, process.env, {
		AMD_ENTRYPOINT: 'vs/code/node/sharedProcessMain'
	});

	if (options.allowOutput) {
		env['VSCODE_ALLOW_IO'] = 'true';
	}

	if (options.debugPort) {
		execArgv.push(`--debug=${ options.debugPort }`);
	}

	const result = cp.fork(boostrapPath, ['--type=SharedProcess'], { env, execArgv });

	// handshake
	result.once('message', () => result.send('hey'));

	return result;
}

  return new Promise((resolve, reject) => {
    const buildProcess = fork(binary, [command, workspaceTarget, ...flags], {
      cwd: projectDir,
      stdio: 'inherit',
    });

    process.on('SIGINT', (signal) => {
      if (!buildProcess.killed) {
        buildProcess.kill();
        reject(new Error(`Bazel process received ${signal}.`));
      }
    });

    buildProcess.once('close', (code: number) => {
      if (code === 0) {
        resolve();
      } else {
        reject(new Error(`${binary} failed with code ${code}.`));
      }
    });
  });

function spawnLintWorker(files: {path: string}[], callback: (failures: number) => void) {
    const child = cp.fork("./scripts/parallel-lint");
    let failures = 0;
    child.on("message", function(data) {
        switch (data.kind) {
            case "result":
                if (data.failures > 0) {
                    failures += data.failures;
                    console.log(data.output);
                }
                sendNextFile(files, child, callback, failures);
                break;
            case "error":
                console.error(data.error);
                failures++;
                sendNextFile(files, child, callback, failures);
                break;
        }
    });
    sendNextFile(files, child, callback, failures);
}

export function spawnSharedProcess(): cp.ChildProcess {
	const result = cp.fork(boostrapPath, ['--type=SharedProcess'], {
		env: assign(assign({}, process.env), {
			AMD_ENTRYPOINT: 'vs/workbench/parts/sharedProcess/node/sharedProcessMain'
		})
	});

	// handshake
	result.once('message', () => {
		result.send({
			configuration: {
				env: getEnvironment()
			},
			contextServiceOptions: {
				globalSettings: SettingsManager.globalSettings
			}
		});
	});

	return result;
}

export async function runCommand(
    path: string, args: string[], options: Options): Promise<string> {
  let commandError: Error|undefined = undefined;
  options.silent = true;
  const forkedProcess = childProcess.fork(path, args, options);
  const outputPromise =
      pipesToString(forkedProcess.stdout!, forkedProcess.stderr!);
  // listen for errors as they may prevent the exit event from firing
  forkedProcess.on('error', (error) => {
    commandError = error;
  });
  const exitCode = await new Promise<number>((resolve) => {
    forkedProcess.on('exit', resolve);
  });
  if (exitCode !== 0) {
    commandError = new Error(
        `Error running ${path} with args ${args}. ` +
        `Got exit code: ${exitCode}`);
  }
  if (!commandError) {
    return outputPromise;
  }

  // If the command was successful there's no need to print anything to
  // the console, but if it failed then its output is probably helpful.
  // Print out the output, then reject the final result with the original
  // error.
  const out = await outputPromise;
  if (options.failureExpected) {
    // Throw the output string as our error if failure is expected.
    throw out;
  }

  console.log(
      `Output of failed command 'node ${path} ${args.join(' ')}' ` +
      `in directory ${options.cwd}`);
  console.log(out);
  throw commandError;
}

 let startProcess = () => {
   lintProcess = fork(`${__dirname}/linter-process`, [], {
     execArgv: process.execArgv.filter(arg => !arg.includes('inspect'))
   });
   lintProcess.on('close', (code: number) => {
     if (code !== 0 && code !== null) {
       logger.log('linter', `linting process exited with code ${code}`);
     }
   });
   lintProcess.on('message', (response: LinterResponse) => {
     if (response.violation) {
       let { fileName, line, column, message, hasFix } = response.violation;
       errors++;
       if (hasFix) {
         fixable++;
       }
       logger.log('linter', `${absolutePath(fileName)}:${line}:${column} ${message}`);
     }
     if (response.finished) {
       running = false;
       logger.log('linter', response.finished.success
         ? 'All files are ok'
         : `${errors} Linting problems found, ${fixable} ${fix ? 'fixed' : 'fixable'}`);
       bus.signal(response.finished.success ? 'lint-linted' : 'lint-errored');
       bus.report({
         tool: 'lint',
         status: 'ready',
         errors: errors,
         fixable: fixable
       });
       if (rescheduled) {
         startLint().catch(logError);
       }
     }
     if (response.error) {
       logger.error('linter', response.error.message);
     }
   });
 };

export default function forkSererProcess(extraArgs: string[] = []) {
  const serverPath = `${settings.corePath}/server/index.js`;

  const serverEnv: { [key: string]: string; } = {};
  serverEnv["ELECTRON_RUN_AS_NODE"] = "1";
  serverEnv["ELECTRON_NO_ATTACH_CONSOLE"] = "1";

  // NOTE: It would be nice to simply copy all environment variables
  // but somehow, this prevents Electron 0.35.1 from starting the server
  // for (const key in nodeProcess.env) serverEnv[key] = nodeProcess.env[key];

  // So instead, we'll just copy the environment variables we definitely need
  for (const varName of [ "NODE_ENV", "APPDATA", "HOME", "XDG_DATA_HOME" ]) {
    if (process.env[varName] != null) serverEnv[varName] = process.env[varName];
  }

  const serverProcess = fork(
    serverPath,
    [ `--data-path=${settings.userDataPath}` ].concat(extraArgs),
    { silent: true, env: serverEnv }
  );
  return serverProcess;
}

    return q.Promise((resolve, reject) => {
      this.checkSupportedConfig();

      let args = [
        '--fork', '--seleniumAddress', this.config.seleniumAddress, '--rootElement',
        this.config.rootElement
      ];
      this.bpProcess = fork(BP_PATH, args, {silent: true});
      logger.info('Starting BlockingProxy with args: ' + args.toString());
      this.bpProcess
          .on('message',
              (data) => {
                this.port = data['port'];
                resolve(data['port']);
              })
          .on('error',
              (err) => {
                reject(new Error('Unable to start BlockingProxy ' + err));
              })
          .on('exit', (code: number, signal: number) => {
            reject(new Error('BP exited with ' + code));
            logger.error('Exited with ' + code);
            logger.error('signal ' + signal);
          });

      this.bpProcess.stdout.on('data', (msg: Buffer) => {
        logger.debug(msg.toString().trim());
      });

      this.bpProcess.stderr.on('data', (msg: Buffer) => {
        logger.error(msg.toString().trim());
      });

      process.on('exit', () => {
        this.bpProcess.kill();
      });
    });

	return new Promise<void>((c, e) => {
		const child = cp.fork(
			__filename,
			[MARKER_ARGUMENT, base64encode(JSON.stringify(options))],
			{
				stdio: ['pipe', 'pipe', 'pipe', 'ipc']
			}
		);
		let stderr: Buffer[] = [];
		child.stderr.on('data', (chunk) => {
			stderr.push(typeof chunk === 'string' ? Buffer.from(chunk) : chunk);
		});
		child.on('exit', (code) => {
			if (code === 0) {
				// normal termination
				console.log(`Finished downloading ${url}.`);
				c();
			} else {
				// abnormal termination
				console.error(Buffer.concat(stderr).toString());
				e(new Error(`Download of ${url} failed.`));
			}
		});
	});

function _spawnSharedProcess(envService: IEnvironmentService, updateManager: IUpdateService, settingsManager: ISettingsService): cp.ChildProcess {
	// Make sure the nls configuration travels to the shared process.
	const opts = {
		env: assign(assign({}, process.env), {
			AMD_ENTRYPOINT: 'vs/code/node/sharedProcessMain'
		})
	};

	const result = cp.fork(boostrapPath, ['--type=SharedProcess'], opts);

	// handshake
	result.once('message', () => {
		result.send({
			configuration: {
				env: getEnvironment(envService, updateManager)
			},
			contextServiceOptions: {
				globalSettings: settingsManager.globalSettings
			}
		});
	});

	return result;
}