build(bazel): Add Bazel builders (#27141)

PR Close #27141

packages/bazel/src/builders/BUILD.bazel

@@ -0,0 +1,30 @@
+package(default_visibility = ["//visibility:public"])
+
+filegroup(
+    name = "package_assets",
+    srcs = [
+        "builders.json",
+    ],
+    visibility = ["//packages/bazel:__subpackages__"],
+)
+
+load("//tools:defaults.bzl", "ts_library")
+
+ts_library(
+    name = "builders",
+    srcs = [
+        "bazel.ts",
+        "index.ts",
+        "schema.d.ts",
+    ],
+    data = [
+        "schema.json",
+    ],
+    deps = [
+        "@ngdeps//@angular-devkit/architect",
+        "@ngdeps//@angular-devkit/core",
+        "@ngdeps//@types/node",
+        "@rxjs",
+        "@rxjs//operators",
+    ],
+)

packages/bazel/src/builders/bazel.ts

@@ -0,0 +1,43 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+/// <reference types='node'/>
+import {spawn, spawnSync} from 'child_process';
+import {Observable, Subject} from 'rxjs';
+
+export type Executable = 'bazel' | 'ibazel';
+export type Command = 'build' | 'test' | 'run' | 'coverage' | 'query';
+
+export function runBazel(
+    projectDir: string, executable: Executable, command: Command, workspaceTarget: string,
+    flags: string[]): Observable<void> {
+  const doneSubject = new Subject<void>();
+  const buildProcess = spawn(executable, [command, workspaceTarget, ...flags], {
+    cwd: projectDir,
+    stdio: 'inherit',
+    shell: false,
+  });
+
+  buildProcess.once('close', (code: number) => {
+    if (code === 0) {
+      doneSubject.next();
+    } else {
+      doneSubject.error(`${executable} failed with code ${code}.`);
+    }
+  });
+
+  return doneSubject.asObservable();
+}
+
+export function checkInstallation(executable: Executable, projectDir: string) {
+  const child = spawnSync(executable, ['version'], {
+    cwd: projectDir,
+    shell: false,
+  });
+  return child.status === 0;
+}

packages/bazel/src/builders/builders.json

@@ -0,0 +1,9 @@
+{
+  "builders": {
+    "build": {
+      "class": "./index#Builder",
+      "schema": "./schema.json",
+      "description": "Executes Bazel on a target."
+    }
+  }
+}

packages/bazel/src/builders/index.ts

@@ -0,0 +1,40 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ *
+ * @fileoverview Bazel bundle builder
+ */
+
+import {BuildEvent, Builder as BuilderInterface, BuilderConfiguration, BuilderContext} from '@angular-devkit/architect';
+import {getSystemPath, resolve} from '@angular-devkit/core';
+import {Observable, of } from 'rxjs';
+import {catchError, map, tap} from 'rxjs/operators';
+
+import {checkInstallation, runBazel} from './bazel';
+import {Schema} from './schema';
+
+export class Builder implements BuilderInterface<Schema> {
+  constructor(private context: BuilderContext) {}
+
+  run(builderConfig: BuilderConfiguration<Partial<Schema>>): Observable<BuildEvent> {
+    const projectRoot = getSystemPath(resolve(this.context.workspace.root, builderConfig.root));
+    const targetLabel = builderConfig.options.targetLabel;
+
+    const executable = builderConfig.options.watch ? 'ibazel' : 'bazel';
+
+    if (!checkInstallation(executable, projectRoot)) {
+      throw new Error(
+          `Could not run ${executable}. Please make sure that the ` +
+          `"${executable}" command is available in the $PATH.`);
+    }
+
+    // TODO: Support passing flags.
+    return runBazel(
+               projectRoot, executable, builderConfig.options.bazelCommand !, targetLabel !,
+               [] /* flags */)
+        .pipe(map(() => ({success: true})), catchError(() => of ({success: false})), );
+  }
+}

packages/bazel/src/builders/schema.d.ts

@@ -0,0 +1,24 @@
+
+// THIS FILE IS AUTOMATICALLY GENERATED. TO UPDATE THIS FILE YOU NEED TO CHANGE THE
+// CORRESPONDING JSON SCHEMA FILE, THEN RUN devkit-admin build (or bazel build ...).
+
+// tslint:disable:no-global-tslint-disable
+// tslint:disable
+
+/**
+ * Options for Bazel Builder
+ */
+export interface Schema {
+  bazelCommand: BazelCommand;
+  /**
+   * Target to be executed under Bazel.
+   */
+  targetLabel: string;
+  watch?: boolean;
+}
+
+export enum BazelCommand {
+  Build = 'build',
+  Run = 'run',
+  Test = 'test',
+}

packages/bazel/src/builders/schema.json

@@ -0,0 +1,29 @@
+{
+    "$schema": "http://json-schema.org/schema",
+    "title": "Bazel builder schema",
+    "description": "Options for Bazel Builder",
+    "type": "object",
+    "properties": {
+        "targetLabel": {
+            "type": "string",
+            "description": "Target to be executed under Bazel."
+        },
+        "bazelCommand": {
+            "type": "string",
+            "enum": [
+                "run",
+                "build",
+                "test"
+            ]
+        },
+        "watch": {
+            "type": "boolean",
+            "default": false
+        }
+    },
+    "additionalProperties": false,
+    "required": [
+        "targetLabel",
+        "bazelCommand"
+    ]
+}