Fasta infrastructure.

pkg/fasta/lib/src/errors.dart

+// Copyright (c) 2016, 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.
+
+library fasta.errors;
+
+import 'dart:async' show
+    Future;
+
+import 'dart:convert' show
+    JSON;
+
+import 'dart:io' show
+    ContentType,
+    HttpClient,
+    HttpClientRequest,
+    SocketException,
+    stderr;
+
+import 'colors.dart' show
+    red;
+
+const String defaultServerAddress = "http://127.0.0.1:59410/";
+
+/// Tracks if there has been a crash reported through [reportCrash]. Should be
+/// reset between each compilation by calling [resetCrashReporting].
+bool hasCrashed = false;
+
+/// Tracks the first source URI that has been read and is used as a fall-back
+/// for [reportCrash]. Should be reset between each compilation by calling
+/// [resetCrashReporting].
+Uri firstSourceUri;
+
+dynamic internalError(Object error) {
+  throw error;
+}
+
+dynamic inputError(Uri uri, int charOffset, Object error) {
+  throw new InputError(uri, charOffset, error);
+}
+
+class InputError {
+  final Uri uri;
+
+  final int charOffset;
+
+  final Object error;
+
+  InputError(this.uri, int charOffset, this.error)
+      : this.charOffset = charOffset ?? -1;
+
+  toString() => "InputError: $error";
+
+  String format() {
+    // TODO(ahe): Colors need to be optional. Doesn't work well in Emacs or on
+    // Windows.
+    String message = red("Error: ${safeToString(error)}");
+    if (uri != null) {
+      String position = charOffset == -1 ? "" : "$charOffset:";
+      return "${uri}:$position $message";
+    } else {
+      return message;
+    }
+  }
+}
+
+class Crash {
+  final Uri uri;
+
+  final int charOffset;
+
+  final Object error;
+
+  final StackTrace trace;
+
+  Crash(this.uri, this.charOffset, this.error, this.trace);
+
+  String toString() {
+    return """
+Crash when compiling $uri,
+at character offset $charOffset:
+$error${trace == null ? '' : '\n$trace'}
+""";
+  }
+}
+
+void resetCrashReporting() {
+  firstSourceUri = null;
+  hasCrashed = false;
+}
+
+Future reportCrash(error, StackTrace trace, [Uri uri, int charOffset]) async {
+  note(String note) async {
+    stderr.write(note);
+    await stderr.flush();
+  }
+  if (hasCrashed) return new Future.error(error, trace);
+  if (error is Crash) {
+    trace = error.trace ?? trace;
+    uri = error.uri ?? uri;
+    charOffset = error.charOffset ?? charOffset;
+    error = error.error;
+  }
+  uri ??= firstSourceUri;
+  hasCrashed = true;
+  Map<String, dynamic> data = <String, dynamic>{};
+  data["type"] = "crash";
+  data["client"] = "package:fasta";
+  if (uri != null) data["uri"] = "$uri";
+  if (charOffset != null) data["offset"] = charOffset;
+  data["error"] = safeToString(error);
+  data["trace"] = "$trace";
+  String json = JSON.encode(data);
+  HttpClient client = new HttpClient();
+  try {
+    Uri uri = Uri.parse(defaultServerAddress);
+    HttpClientRequest request;
+    try {
+      request = await client.postUrl(uri);
+    } on SocketException {
+      // Assume the crash logger isn't running.
+      await client.close(force: true);
+      return new Future.error(error, trace);
+    }
+    if (request != null) {
+      await note("\nSending crash report data");
+      request.persistentConnection = false;
+      request.bufferOutput = false;
+      String host = request?.connectionInfo?.remoteAddress?.host;
+      int port = request?.connectionInfo?.remotePort;
+      await note(" to $host:$port");
+      await request
+          ..headers.contentType = ContentType.JSON
+          ..write(json);
+      await request.close();
+      await note(".");
+    }
+  } catch (e, s) {
+    await note("\n${safeToString(e)}\n$s\n");
+    await note("\n\n\nFE::ERROR::$json\n\n\n");
+  }
+  await client.close(force: true);
+  await note("\n");
+  return new Future.error(error, trace);
+}
+
+String safeToString(Object object) {
+  try {
+    return "$object";
+  } catch (e) {
+    return "Error when converting ${object.runtimeType} to string.";
+  }
+}