9e2cf0d8d187dd222e5456ac40c8a4a4c347a812 - bazel_worker

commit	9e2cf0d8d187dd222e5456ac40c8a4a4c347a812	[log] [tgz]
author	Alexander Thomas <athom@google.com>	Mon Dec 21 22:46:55 2020 +0100
committer	GitHub <noreply@github.com>	Mon Dec 21 13:46:55 2020 -0800
tree	12fa543fd1b82b87b11df8f113aa984e4848e34d
parent	060c55a933d39798681a4f533b161b81dc48d77e [diff]

tree: 12fa543fd1b82b87b11df8f113aa984e4848e34d

README.md

Tools for creating a persistent worker loop for bazel.

Usage

There are two abstract classes provided by this package, AsyncWorkerLoop and SyncWorkerLoop. These each have a performRequest method which you must implement.

Lets look at a simple example of a SyncWorkerLoop implementation:

import 'dart:io';
import 'package:bazel_worker/bazel_worker.dart';

void main() {
  // Blocks until it gets an EOF from stdin.
  new SyncSimpleWorker().run();
}

class SyncSimpleWorker extends SyncWorkerLoop {
  /// Must synchronously return a [WorkResponse], since this is a
  /// [SyncWorkerLoop].
  WorkResponse performRequest(WorkRequest request) {
    new File('hello.txt').writeAsStringSync('hello world!');
    return new WorkResponse()..exitCode = EXIT_CODE_OK;
  }
}

And now the same thing, implemented as an AsyncWorkerLoop:

import 'dart:io';
import 'package:bazel_worker/bazel_worker.dart';

void main() {
  // Doesn't block, runs tasks async as they are received on stdin.
  new AsyncSimpleWorker().run();
}

class AsyncSimpleWorker extends AsyncWorkerLoop {
  /// Must return a [Future<WorkResponse>], since this is an
  /// [AsyncWorkerLoop].
  Future<WorkResponse> performRequest(WorkRequest request) async {
    await new File('hello.txt').writeAsString('hello world!');
    return new WorkResponse()..exitCode = EXIT_CODE_OK;
  }
}

As you can see, these are nearly identical, it mostly comes down to the constraints on your package and personal preference which one you choose to implement.

Testing

A package:bazel_worker/testing.dart file is also provided, which can greatly assist with writing unit tests for your worker. See the test/worker_loop_test.dart test included in this package for an example of how the helpers can be used.

Features and bugs

Please file feature requests and bugs at the issue tracker.