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// 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 "chrome/common/metrics_log_manager.h"
#if defined(USE_SYSTEM_LIBBZ2)
#include <bzlib.h>
#else
#include "third_party/bzip2/bzlib.h"
#endif
#include "base/metrics/histogram.h"
#include "base/string_util.h"
#include "chrome/common/metrics_helpers.h"
MetricsLogManager::MetricsLogManager() : max_ongoing_log_store_size_(0) {}
MetricsLogManager::~MetricsLogManager() {}
void MetricsLogManager::BeginLoggingWithLog(MetricsLogBase* log) {
DCHECK(!current_log_.get());
current_log_.reset(log);
}
void MetricsLogManager::StageCurrentLogForUpload() {
DCHECK(current_log_.get());
current_log_->CloseLog();
staged_log_.reset(current_log_.release());
CompressStagedLog();
}
bool MetricsLogManager::has_staged_log() const {
return staged_log_.get() || !compressed_staged_log_text_.empty();
}
void MetricsLogManager::DiscardStagedLog() {
staged_log_.reset();
compressed_staged_log_text_.clear();
}
void MetricsLogManager::DiscardCurrentLog() {
current_log_->CloseLog();
current_log_.reset();
}
void MetricsLogManager::PauseCurrentLog() {
DCHECK(!paused_log_.get());
paused_log_.reset(current_log_.release());
}
void MetricsLogManager::ResumePausedLog() {
DCHECK(!current_log_.get());
current_log_.reset(paused_log_.release());
}
void MetricsLogManager::StoreStagedLogAsUnsent(LogType log_type) {
DCHECK(staged_log_.get());
// If compressing the log failed, there's nothing to store.
if (compressed_staged_log_text_.empty())
return;
if (log_type == INITIAL_LOG) {
unsent_initial_logs_.push_back(compressed_staged_log_text_);
} else {
// If it's too large, just note that and discard it.
if (max_ongoing_log_store_size_ &&
compressed_staged_log_text_.length() > max_ongoing_log_store_size_) {
UMA_HISTOGRAM_COUNTS(
"UMA.Large Accumulated Log Not Persisted",
static_cast<int>(compressed_staged_log_text_.length()));
} else {
unsent_ongoing_logs_.push_back(compressed_staged_log_text_);
}
}
DiscardStagedLog();
}
void MetricsLogManager::StageNextStoredLogForUpload() {
// Prioritize initial logs for uploading.
std::vector<std::string>* source_list = unsent_initial_logs_.empty() ?
&unsent_ongoing_logs_ : &unsent_initial_logs_;
DCHECK(!source_list->empty());
DCHECK(compressed_staged_log_text_.empty());
compressed_staged_log_text_ = source_list->back();
source_list->pop_back();
}
void MetricsLogManager::PersistUnsentLogs() {
DCHECK(log_serializer_.get());
if (!log_serializer_.get())
return;
log_serializer_->SerializeLogs(unsent_initial_logs_, INITIAL_LOG);
log_serializer_->SerializeLogs(unsent_ongoing_logs_, ONGOING_LOG);
}
void MetricsLogManager::LoadPersistedUnsentLogs() {
DCHECK(log_serializer_.get());
if (!log_serializer_.get())
return;
log_serializer_->DeserializeLogs(INITIAL_LOG, &unsent_initial_logs_);
log_serializer_->DeserializeLogs(ONGOING_LOG, &unsent_ongoing_logs_);
}
void MetricsLogManager::CompressStagedLog() {
int text_size = staged_log_->GetEncodedLogSize();
std::string staged_log_text;
// Leave room for the NULL terminator.
staged_log_->GetEncodedLog(WriteInto(&staged_log_text, text_size + 1),
text_size);
bool success = Bzip2Compress(staged_log_text, &compressed_staged_log_text_);
if (success) {
// Allow security-conscious users to see all metrics logs that we send.
VLOG(1) << "METRICS LOG: " << staged_log_text;
} else {
LOG(DFATAL) << "Failed to compress log for transmission.";
}
}
// static
// This implementation is based on the Firefox MetricsService implementation.
bool MetricsLogManager::Bzip2Compress(const std::string& input,
std::string* output) {
bz_stream stream = {0};
// As long as our input is smaller than the bzip2 block size, we should get
// the best compression. For example, if your input was 250k, using a block
// size of 300k or 500k should result in the same compression ratio. Since
// our data should be under 100k, using the minimum block size of 100k should
// allocate less temporary memory, but result in the same compression ratio.
int result = BZ2_bzCompressInit(&stream,
1, // 100k (min) block size
0, // quiet
0); // default "work factor"
if (result != BZ_OK) { // out of memory?
return false;
}
output->clear();
stream.next_in = const_cast<char*>(input.data());
stream.avail_in = static_cast<int>(input.size());
// NOTE: we don't need a BZ_RUN phase since our input buffer contains
// the entire input
do {
output->resize(output->size() + 1024);
stream.next_out = &((*output)[stream.total_out_lo32]);
stream.avail_out = static_cast<int>(output->size()) - stream.total_out_lo32;
result = BZ2_bzCompress(&stream, BZ_FINISH);
} while (result == BZ_FINISH_OK);
if (result != BZ_STREAM_END) { // unknown failure?
output->clear();
// TODO(jar): See if it would be better to do a CHECK() here.
return false;
}
result = BZ2_bzCompressEnd(&stream);
DCHECK(result == BZ_OK);
output->resize(stream.total_out_lo32);
return true;
}
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