Adding RTCErrorOr class to be used by ORTC APIs.

webrtc/api/rtcerror.cc

+/*
+ *  Copyright 2017 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "webrtc/api/rtcerror.h"
+
+#include "webrtc/base/arraysize.h"
+
+namespace {
+
+static const char* const kRTCErrorTypeNames[] = {
+    "NONE",
+    "UNSUPPORTED_OPERATION",
+    "UNSUPPORTED_PARAMETER",
+    "INVALID_PARAMETER",
+    "INVALID_RANGE",
+    "SYNTAX_ERROR",
+    "INVALID_STATE",
+    "INVALID_MODIFICATION",
+    "NETWORK_ERROR",
+    "RESOURCE_EXHAUSTED",
+    "INTERNAL_ERROR",
+};
+static_assert(static_cast<int>(webrtc::RTCErrorType::INTERNAL_ERROR) ==
+                  (arraysize(kRTCErrorTypeNames) - 1),
+              "kRTCErrorTypeNames must have as many strings as RTCErrorType "
+              "has values.");
+
+}  // namespace
+
+namespace webrtc {
+
+// static
+const RTCError& RTCError::OK() {
+  static RTCError ok;
+  return ok;
+}
+
+std::ostream& operator<<(std::ostream& stream, RTCErrorType error) {
+  int index = static_cast<int>(error);
+  return stream << kRTCErrorTypeNames[index];
+}
+
+webrtc::RTCError CreateAndLogError(webrtc::RTCErrorType type,
+                                   const std::string& message,
+                                   rtc::LoggingSeverity severity) {
+  // "No error" shouldn't be logged as an error.
+  RTC_DCHECK(type != RTCErrorType::NONE);
+  rtc::LogMessage(__FILE__, __LINE__, severity).stream() << message << " ("
+                                                         << type << ")";
+  return webrtc::RTCError(type, message);
+}
+
+webrtc::RTCError CreateAndLogError(webrtc::RTCErrorType type,
+                                   const std::string& message) {
+  return CreateAndLogError(type, message, rtc::LS_ERROR);
+}
+
+}  // namespace webrtc