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// Copyright (c) 2013 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/loader/offline_policy.h"
#include "base/command_line.h"
#include "base/metrics/histogram.h"
#include "content/public/common/content_switches.h"
#include "net/base/load_flags.h"
#include "net/http/http_response_info.h"
#include "net/url_request/url_request.h"
namespace content {
OfflinePolicy::OfflinePolicy()
: enabled_(CommandLine::ForCurrentProcess()->HasSwitch(
switches::kEnableOfflineCacheAccess)),
state_(INIT),
resource_loads_initiated_(0),
resource_loads_successfully_started_(0) {}
OfflinePolicy::~OfflinePolicy() {
RecordAndResetStats();
}
void OfflinePolicy::RecordAndResetStats() {
if (enabled_ && OFFLINE == state_ && 0 != resource_loads_initiated_) {
UMA_HISTOGRAM_PERCENTAGE(
"OfflinePolicy.SuccessfulResourceLoadPercentage",
(resource_loads_successfully_started_ * 100 /
resource_loads_initiated_));
}
resource_loads_initiated_ = 0;
resource_loads_successfully_started_ = 0;
}
int OfflinePolicy::GetAdditionalLoadFlags(int current_flags,
bool reset_state) {
// Don't do anything if offline mode is disabled.
if (!enabled_)
return 0;
if (reset_state) {
RecordAndResetStats();
state_ = INIT;
}
++resource_loads_initiated_;
// If a consumer has requested something contradictory, it wins; we
// don't modify the load flags.
if (current_flags &
(net::LOAD_BYPASS_CACHE | net::LOAD_PREFERRING_CACHE |
net::LOAD_ONLY_FROM_CACHE | net::LOAD_FROM_CACHE_IF_OFFLINE |
net::LOAD_DISABLE_CACHE)) {
return 0;
}
switch(state_) {
case INIT:
return net::LOAD_FROM_CACHE_IF_OFFLINE;
case ONLINE:
return 0;
case OFFLINE:
return net::LOAD_ONLY_FROM_CACHE;
}
NOTREACHED();
return 0;
}
void OfflinePolicy::UpdateStateForSuccessfullyStartedRequest(
const net::HttpResponseInfo& response_info) {
// Don't do anything if offline mode is disabled.
if (!enabled_)
return;
// If we get here, we're going to be providing some amount of information
// to the renderer.
++resource_loads_successfully_started_;
if (state_ != INIT)
// We've already made the decision for the rest of this set
// of navigations.
return;
if (response_info.server_data_unavailable) {
state_ = OFFLINE;
} else if (response_info.network_accessed) {
// If we got the response from the network or validated it as part
// of this request, that means our connection to the host is working.
state_ = ONLINE;
}
}
} // namespace content
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