// Copyright (c) 2011 The Chromium Authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #include "content/browser/trace_subscriber_stdio.h" #include "base/logging.h" TraceSubscriberStdio::TraceSubscriberStdio(const FilePath& path) { LOG(INFO) << "Logging performance trace to file: " << path.value(); file_ = file_util::OpenFile(path, "w+"); if (IsValid()) { // FIXME: the file format expects it to start with "[". fputc('[', file_); } else { LOG(ERROR) << "Failed to open performance trace file: " << path.value(); } } TraceSubscriberStdio::~TraceSubscriberStdio() { OnEndTracingComplete(); } bool TraceSubscriberStdio::IsValid() { return file_ && (0 == ferror(file_)); } void TraceSubscriberStdio::OnEndTracingComplete() { if (file_) { // FIXME: the file format expects it to end with "]". fputc(']', file_); fclose(file_); file_ = 0; } } void TraceSubscriberStdio::OnTraceDataCollected( const std::string& json_events) { if (!IsValid()) { return; } // FIXME: "json_events" currently comes with "[" and "]". But the file doesn't // expect them. So remove them when writing to the file. CHECK_GE(json_events.size(), 2u); const char* data = json_events.data() + 1; size_t size = json_events.size() - 2; size_t written = fwrite(data, 1, size, file_); if (written != size) { LOG(ERROR) << "Error " << ferror(file_) << " when writing to trace file"; fclose(file_); file_ = 0; } else { fputc(',', file_); } }