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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 "net/url_request/url_request_throttler_manager.h"
#include "base/string_util.h"
namespace net {
const unsigned int URLRequestThrottlerManager::kMaximumNumberOfEntries = 1500;
const unsigned int URLRequestThrottlerManager::kRequestsBetweenCollecting = 200;
URLRequestThrottlerManager* URLRequestThrottlerManager::GetInstance() {
return Singleton<URLRequestThrottlerManager>::get();
}
scoped_refptr<URLRequestThrottlerEntryInterface>
URLRequestThrottlerManager::RegisterRequestUrl(const GURL &url) {
// Normalize the url.
std::string url_id = GetIdFromUrl(url);
// Periodically garbage collect old entries.
GarbageCollectEntriesIfNecessary();
// Find the entry in the map or create it.
scoped_refptr<URLRequestThrottlerEntry>& entry = url_entries_[url_id];
if (entry == NULL)
entry = new URLRequestThrottlerEntry();
return entry;
}
void URLRequestThrottlerManager::OverrideEntryForTests(
const GURL& url,
URLRequestThrottlerEntry* entry) {
if (entry == NULL)
return;
// Normalize the url.
std::string url_id = GetIdFromUrl(url);
// Periodically garbage collect old entries.
GarbageCollectEntriesIfNecessary();
url_entries_[url_id] = entry;
}
void URLRequestThrottlerManager::EraseEntryForTests(const GURL& url) {
// Normalize the url.
std::string url_id = GetIdFromUrl(url);
url_entries_.erase(url_id);
}
URLRequestThrottlerManager::URLRequestThrottlerManager()
: requests_since_last_gc_(0),
enforce_throttling_(true) {
}
URLRequestThrottlerManager::~URLRequestThrottlerManager() {
// Delete all entries.
url_entries_.clear();
}
std::string URLRequestThrottlerManager::GetIdFromUrl(const GURL& url) const {
if (!url.is_valid())
return url.possibly_invalid_spec();
if (url_id_replacements_ == NULL) {
url_id_replacements_.reset(new GURL::Replacements());
url_id_replacements_->ClearPassword();
url_id_replacements_->ClearUsername();
url_id_replacements_->ClearQuery();
url_id_replacements_->ClearRef();
}
GURL id = url.ReplaceComponents(*url_id_replacements_);
return StringToLowerASCII(id.spec());
}
void URLRequestThrottlerManager::GarbageCollectEntriesIfNecessary() {
requests_since_last_gc_++;
if (requests_since_last_gc_ < kRequestsBetweenCollecting)
return;
requests_since_last_gc_ = 0;
GarbageCollectEntries();
}
void URLRequestThrottlerManager::GarbageCollectEntries() {
UrlEntryMap::iterator i = url_entries_.begin();
while (i != url_entries_.end()) {
if ((i->second)->IsEntryOutdated()) {
url_entries_.erase(i++);
} else {
++i;
}
}
// In case something broke we want to make sure not to grow indefinitely.
while (url_entries_.size() > kMaximumNumberOfEntries) {
url_entries_.erase(url_entries_.begin());
}
}
} // namespace net
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