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// Copyright (c) 2010 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/browser/net/load_timing_observer.h"
#include "base/compiler_specific.h"
#include "base/time.h"
#include "net/base/load_flags.h"
#include "net/url_request/url_request_netlog_params.h"
using base::Time;
using base::TimeTicks;
using webkit_glue::ResourceLoaderBridge;
const size_t kMaxNumEntries = 1000;
namespace {
// We know that this conversion is not solid and suffers from world clock
// changes, but it should be good enough for the load timing info.
static Time TimeTicksToTime(const TimeTicks& time_ticks) {
static int64 tick_to_time_offset;
static bool tick_to_time_offset_available = false;
if (!tick_to_time_offset_available) {
int64 cur_time = (Time::Now() - Time()).InMicroseconds();
int64 cur_time_ticks = (TimeTicks::Now() - TimeTicks()).InMicroseconds();
// If we add this number to a time tick value, it gives the timestamp.
tick_to_time_offset = cur_time - cur_time_ticks;
tick_to_time_offset_available = true;
}
return Time::FromInternalValue(time_ticks.ToInternalValue() +
tick_to_time_offset);
}
static int32 TimeTicksToOffset(
const TimeTicks& time_ticks,
LoadTimingObserver::URLRequestRecord* record) {
return static_cast<int32>(
(time_ticks - record->base_ticks).InMillisecondsRoundedUp());
}
}
LoadTimingObserver::URLRequestRecord::URLRequestRecord()
: connect_job_id(net::NetLog::Source::kInvalidId),
socket_log_id(net::NetLog::Source::kInvalidId),
socket_reused(false) {
}
LoadTimingObserver::LoadTimingObserver() {
}
LoadTimingObserver::~LoadTimingObserver() {
}
LoadTimingObserver::URLRequestRecord*
LoadTimingObserver::GetURLRequestRecord(uint32 source_id) {
URLRequestToRecordMap::iterator it = url_request_to_record_.find(source_id);
if (it != url_request_to_record_.end())
return &it->second;
return NULL;
}
void LoadTimingObserver::OnAddEntry(net::NetLog::EventType type,
const base::TimeTicks& time,
const net::NetLog::Source& source,
net::NetLog::EventPhase phase,
net::NetLog::EventParameters* params) {
if (source.type == net::NetLog::SOURCE_URL_REQUEST)
OnAddURLRequestEntry(type, time, source, phase, params);
else if (source.type == net::NetLog::SOURCE_CONNECT_JOB)
OnAddConnectJobEntry(type, time, source, phase, params);
}
void LoadTimingObserver::OnAddURLRequestEntry(
net::NetLog::EventType type,
const base::TimeTicks& time,
const net::NetLog::Source& source,
net::NetLog::EventPhase phase,
net::NetLog::EventParameters* params) {
bool is_begin = phase == net::NetLog::PHASE_BEGIN;
bool is_end = phase == net::NetLog::PHASE_END;
if (type == net::NetLog::TYPE_URL_REQUEST_START_JOB) {
if (is_begin) {
// Only record timing for entries with corresponding flag.
int load_flags = static_cast<URLRequestStartEventParameters*>(params)->
load_flags();
if (!(load_flags & net::LOAD_ENABLE_LOAD_TIMING))
return;
// Prevents us from passively growing the memory memory unbounded in case
// something went wrong. Should not happen.
if (url_request_to_record_.size() > kMaxNumEntries) {
LOG(WARNING) << "The load timing observer url request count has grown "
"larger than expected, resetting";
url_request_to_record_.clear();
}
URLRequestRecord& record = url_request_to_record_[source.id];
record.base_ticks = time;
record.timing.base_time = TimeTicksToTime(time);
}
return;
} else if (type == net::NetLog::TYPE_REQUEST_ALIVE) {
// Cleanup records based on the TYPE_REQUEST_ALIVE entry.
if (is_end)
url_request_to_record_.erase(source.id);
return;
}
URLRequestRecord* record = GetURLRequestRecord(source.id);
if (!record)
return;
ResourceLoaderBridge::LoadTimingInfo& timing = record->timing;
switch(type) {
case net::NetLog::TYPE_PROXY_SERVICE:
if (is_begin)
timing.proxy_start = TimeTicksToOffset(time, record);
else if (is_end)
timing.proxy_end = TimeTicksToOffset(time, record);
break;
case net::NetLog::TYPE_SOCKET_POOL:
if (is_begin)
timing.connect_start = TimeTicksToOffset(time, record);
else if (is_end)
timing.connect_end = TimeTicksToOffset(time, record);
break;
case net::NetLog::TYPE_SOCKET_POOL_BOUND_TO_CONNECT_JOB:
{
uint32 connect_job_id = static_cast<net::NetLogSourceParameter*>(
params)->value().id;
ConnectJobToRecordMap::iterator it =
connect_job_to_record_.find(connect_job_id);
if (it != connect_job_to_record_.end() &&
!it->second.dns_start.is_null()) {
timing.dns_start = TimeTicksToOffset(it->second.dns_start, record);
timing.dns_end = TimeTicksToOffset(it->second.dns_end, record);
}
}
break;
case net::NetLog::TYPE_SOCKET_POOL_REUSED_AN_EXISTING_SOCKET:
record->socket_reused = true;
break;
case net::NetLog::TYPE_SOCKET_POOL_BOUND_TO_SOCKET:
record->socket_log_id = static_cast<net::NetLogSourceParameter*>(
params)->value().id;
break;
case net::NetLog::TYPE_HTTP_TRANSACTION_SEND_REQUEST:
case net::NetLog::TYPE_SPDY_TRANSACTION_SEND_REQUEST:
if (is_begin)
timing.send_start = TimeTicksToOffset(time, record);
else if (is_end)
timing.send_end = TimeTicksToOffset(time, record);
break;
case net::NetLog::TYPE_HTTP_TRANSACTION_READ_HEADERS:
case net::NetLog::TYPE_SPDY_TRANSACTION_READ_HEADERS:
if (is_begin)
timing.receive_headers_start = TimeTicksToOffset(time, record);
else if (is_end)
timing.receive_headers_end = TimeTicksToOffset(time, record);
break;
default:
break;
}
}
void LoadTimingObserver::OnAddConnectJobEntry(
net::NetLog::EventType type,
const base::TimeTicks& time,
const net::NetLog::Source& source,
net::NetLog::EventPhase phase,
net::NetLog::EventParameters* params) {
bool is_begin = phase == net::NetLog::PHASE_BEGIN;
bool is_end = phase == net::NetLog::PHASE_END;
// Manage record lifetime based on the SOCKET_POOL_CONNECT_JOB entry.
if (type == net::NetLog::TYPE_SOCKET_POOL_CONNECT_JOB) {
if (is_begin) {
// Prevents us from passively growing the memory memory unbounded in case
// something went wrong. Should not happen.
if (connect_job_to_record_.size() > kMaxNumEntries) {
LOG(WARNING) << "The load timing observer connect job count has grown "
"larger than expected, resetting";
connect_job_to_record_.clear();
}
connect_job_to_record_.insert(
std::make_pair(source.id, ConnectJobRecord()));
} else if (is_end) {
connect_job_to_record_.erase(source.id);
}
} else if (type == net::NetLog::TYPE_HOST_RESOLVER_IMPL) {
ConnectJobToRecordMap::iterator it =
connect_job_to_record_.find(source.id);
if (it != connect_job_to_record_.end()) {
if (is_begin)
it->second.dns_start = time;
else if (is_end)
it->second.dns_end = time;
}
}
}
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