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// Copyright 2015 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 "net/url_request/url_request_backoff_manager.h"
#include "base/logging.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_piece.h"
#include "base/strings/string_util.h"
#include "net/http/http_response_headers.h"
namespace net {
const uint16_t URLRequestBackoffManager::kMinimumBackoffInSeconds = 1;
const uint16_t URLRequestBackoffManager::kMaximumBackoffInSeconds = 50000;
const uint16_t URLRequestBackoffManager::kNewEntriesBetweenCollecting = 200;
URLRequestBackoffManager::URLRequestBackoffManager()
: new_entries_since_last_gc_(0) {
url_id_replacements_.ClearPassword();
url_id_replacements_.ClearUsername();
url_id_replacements_.ClearQuery();
url_id_replacements_.ClearRef();
NetworkChangeNotifier::AddIPAddressObserver(this);
NetworkChangeNotifier::AddConnectionTypeObserver(this);
}
URLRequestBackoffManager::~URLRequestBackoffManager() {
NetworkChangeNotifier::RemoveIPAddressObserver(this);
NetworkChangeNotifier::RemoveConnectionTypeObserver(this);
for (UrlEntryMap::iterator it = url_entries_.begin();
it != url_entries_.end(); ++it) {
delete it->second;
}
url_entries_.clear();
}
void URLRequestBackoffManager::UpdateWithResponse(
const GURL& url,
HttpResponseHeaders* headers,
const base::Time& response_time) {
CalledOnValidThread();
base::TimeDelta result;
if (GetBackoffTime(headers, &result)) {
new_entries_since_last_gc_++;
std::string url_id = GetIdFromUrl(url);
auto it = url_entries_.find(url_id);
if (it != url_entries_.end())
delete it->second;
url_entries_[url_id] =
new Entry(response_time + result, response_time + result * 1.1);
GarbageCollectEntriesIfNecessary();
}
}
bool URLRequestBackoffManager::ShouldRejectRequest(
const GURL& url,
const base::Time& request_time) {
CalledOnValidThread();
std::string url_id = GetIdFromUrl(url);
UrlEntryMap::iterator it = url_entries_.find(url_id);
if (it == url_entries_.end())
return false;
Entry* entry = it->second;
if (request_time < entry->throttled_time)
return true;
// Allow one request between throttled_time and release_time.
if (request_time >= entry->throttled_time &&
request_time < entry->release_time) {
if (entry->used)
return true;
entry->used = true;
}
return false;
}
void URLRequestBackoffManager::OnIPAddressChanged() {
OnNetworkChange();
}
void URLRequestBackoffManager::OnConnectionTypeChanged(
NetworkChangeNotifier::ConnectionType type) {
OnNetworkChange();
}
int URLRequestBackoffManager::GetNumberOfEntriesForTests() const {
return url_entries_.size();
}
void URLRequestBackoffManager::GarbageCollectEntriesIfNecessary() {
CalledOnValidThread();
if (new_entries_since_last_gc_ < kNewEntriesBetweenCollecting)
return;
new_entries_since_last_gc_ = 0;
UrlEntryMap::iterator it = url_entries_.begin();
while (it != url_entries_.end()) {
Entry* entry = it->second;
if (entry->IsOutDated()) {
url_entries_.erase(it++);
delete entry;
} else {
++it;
}
}
}
bool URLRequestBackoffManager::GetBackoffTime(HttpResponseHeaders* headers,
base::TimeDelta* result) const {
base::StringPiece name("Backoff");
std::string value;
size_t iter = 0;
while (headers->EnumerateHeader(&iter, name, &value)) {
int64_t seconds;
base::StringToInt64(value, &seconds);
if (seconds >= kMinimumBackoffInSeconds &&
seconds <= kMaximumBackoffInSeconds) {
*result = base::TimeDelta::FromSeconds(seconds);
return true;
}
}
return false;
}
std::string URLRequestBackoffManager::GetIdFromUrl(const GURL& url) const {
if (!url.is_valid())
return url.possibly_invalid_spec();
GURL id = url.ReplaceComponents(url_id_replacements_);
return base::ToLowerASCII(id.spec());
}
void URLRequestBackoffManager::OnNetworkChange() {
CalledOnValidThread();
new_entries_since_last_gc_ = 0;
// Remove all entries.
for (UrlEntryMap::iterator it = url_entries_.begin();
it != url_entries_.end(); ++it) {
delete it->second;
}
url_entries_.clear();
}
} // namespace net
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