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// Copyright (c) 2012 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/web_resource/web_resource_service.h"
#include "base/bind.h"
#include "base/message_loop.h"
#include "base/prefs/pref_service.h"
#include "base/string_util.h"
#include "base/strings/string_number_conversions.h"
#include "base/time.h"
#include "base/utf_string_conversions.h"
#include "base/values.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/google/google_util.h"
#include "googleurl/src/gurl.h"
#include "net/base/load_flags.h"
#include "net/url_request/url_fetcher.h"
#include "net/url_request/url_request_status.h"
WebResourceService::WebResourceService(
PrefService* prefs,
const GURL& web_resource_server,
bool apply_locale_to_url,
const char* last_update_time_pref_name,
int start_fetch_delay_ms,
int cache_update_delay_ms)
: prefs_(prefs),
json_unpacker_(NULL),
in_fetch_(false),
web_resource_server_(web_resource_server),
apply_locale_to_url_(apply_locale_to_url),
last_update_time_pref_name_(last_update_time_pref_name),
start_fetch_delay_ms_(start_fetch_delay_ms),
cache_update_delay_ms_(cache_update_delay_ms),
ALLOW_THIS_IN_INITIALIZER_LIST(weak_ptr_factory_(this)) {
resource_request_allowed_notifier_.Init(this);
DCHECK(prefs);
}
WebResourceService::~WebResourceService() {
if (in_fetch_)
EndFetch();
}
void WebResourceService::OnUnpackFinished(const DictionaryValue& parsed_json) {
Unpack(parsed_json);
EndFetch();
}
void WebResourceService::OnUnpackError(const std::string& error_message) {
LOG(ERROR) << error_message;
EndFetch();
}
void WebResourceService::EndFetch() {
if (json_unpacker_) {
json_unpacker_->ClearDelegate();
json_unpacker_ = NULL;
}
in_fetch_ = false;
}
void WebResourceService::StartAfterDelay() {
// If resource requests are not allowed, we'll get a callback when they are.
if (resource_request_allowed_notifier_.ResourceRequestsAllowed())
OnResourceRequestsAllowed();
}
void WebResourceService::OnResourceRequestsAllowed() {
int64 delay = start_fetch_delay_ms_;
// Check whether we have ever put a value in the web resource cache;
// if so, pull it out and see if it's time to update again.
if (prefs_->HasPrefPath(last_update_time_pref_name_)) {
std::string last_update_pref =
prefs_->GetString(last_update_time_pref_name_);
if (!last_update_pref.empty()) {
double last_update_value;
base::StringToDouble(last_update_pref, &last_update_value);
int64 ms_until_update = cache_update_delay_ms_ -
static_cast<int64>((base::Time::Now() - base::Time::FromDoubleT(
last_update_value)).InMilliseconds());
// Wait at least |start_fetch_delay_ms_|.
if (ms_until_update > start_fetch_delay_ms_)
delay = ms_until_update;
}
}
// Start fetch and wait for UpdateResourceCache.
ScheduleFetch(delay);
}
// Delay initial load of resource data into cache so as not to interfere
// with startup time.
void WebResourceService::ScheduleFetch(int64 delay_ms) {
MessageLoop::current()->PostDelayedTask(
FROM_HERE,
base::Bind(&WebResourceService::StartFetch,
weak_ptr_factory_.GetWeakPtr()),
base::TimeDelta::FromMilliseconds(delay_ms));
}
// Initializes the fetching of data from the resource server. Data
// load calls OnURLFetchComplete.
void WebResourceService::StartFetch() {
// First, put our next cache load on the MessageLoop.
ScheduleFetch(cache_update_delay_ms_);
// Set cache update time in preferences.
prefs_->SetString(last_update_time_pref_name_,
base::DoubleToString(base::Time::Now().ToDoubleT()));
// If we are still fetching data, exit.
if (in_fetch_)
return;
in_fetch_ = true;
// Balanced in OnURLFetchComplete.
AddRef();
GURL web_resource_server = apply_locale_to_url_ ?
google_util::AppendGoogleLocaleParam(web_resource_server_) :
web_resource_server_;
DVLOG(1) << "WebResourceService StartFetch " << web_resource_server;
url_fetcher_.reset(net::URLFetcher::Create(
web_resource_server, net::URLFetcher::GET, this));
// Do not let url fetcher affect existing state in system context
// (by setting cookies, for example).
url_fetcher_->SetLoadFlags(net::LOAD_DISABLE_CACHE |
net::LOAD_DO_NOT_SEND_COOKIES |
net::LOAD_DO_NOT_SAVE_COOKIES);
net::URLRequestContextGetter* url_request_context_getter =
g_browser_process->system_request_context();
url_fetcher_->SetRequestContext(url_request_context_getter);
url_fetcher_->Start();
}
void WebResourceService::OnURLFetchComplete(const net::URLFetcher* source) {
// Delete the URLFetcher when this function exits.
scoped_ptr<net::URLFetcher> clean_up_fetcher(url_fetcher_.release());
if (source->GetStatus().is_success() && source->GetResponseCode() == 200) {
std::string data;
source->GetResponseAsString(&data);
// UnpackerClient calls EndFetch and releases itself on completion.
json_unpacker_ = JSONAsynchronousUnpacker::Create(this);
json_unpacker_->Start(data);
} else {
// Don't parse data if attempt to download was unsuccessful.
// Stop loading new web resource data, and silently exit.
// We do not call UnpackerClient, so we need to call EndFetch ourselves.
EndFetch();
}
Release();
}
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