Testrunner for 3rd parties.

utils/testrunner/run_process_task.dart

+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+// A pipeline task to run a process and capture the output.
+class RunProcessTask extends PipelineTask {
+  String commandTemplate;
+  List argumentTemplates;
+  int timeout;
+
+  RunProcessTask(this.commandTemplate, this.argumentTemplates, this.timeout);
+
+  void execute(Path testfile, List stdout, List stderr, bool verboseLogging,
+              Function exitHandler) {
+    var cmd = concretize(commandTemplate, testfile);
+    List args = new List();
+    for (var i = 0; i < argumentTemplates.length; i++) {
+      args.add(concretize(argumentTemplates[i], testfile));
+    }
+
+    if (verboseLogging) {
+      stdout.add('Running $cmd ${Strings.join(args, " ")}');
+    }
+    var timer = null;
+    var process = Process.start(cmd, args);
+    process.onStart = () {
+      timer = new Timer(1000 * timeout, (t) {
+        timer = null;
+        process.kill();
+      });
+    };
+    process.onExit = (exitCode) {
+      if (timer != null) {
+        timer.cancel();
+      }
+      process.close();
+      exitHandler(exitCode);
+    };
+    process.onError = (e) {
+      print("Error starting process:");
+      print("  Command: $cmd");
+      print("  Error: $e");
+      exitHandler(-1);
+    };
+
+    StringInputStream stdoutStringStream =
+        new StringInputStream(process.stdout);
+    StringInputStream stderrStringStream =
+        new StringInputStream(process.stderr);
+    stdoutStringStream.onLine = makeReadHandler(stdoutStringStream, stdout);
+    stderrStringStream.onLine = makeReadHandler(stderrStringStream, stderr);
+  }
+
+  Function makeReadHandler(StringInputStream source, List<String> destination) {
+    return () {
+      if (source.closed) return;
+      var line = source.readLine();
+      while (null != line) {
+        destination.add(line);
+        line = source.readLine();
+      }
+    };
+  }
+}