Anti-DDoS enhancements: Log to net log, UMA stats, improved policy.

chrome/browser/net/passive_log_collector.cc

 // Copyright (c) 2011 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/passive_log_collector.h"
 
 #include <algorithm>
 
 #include "base/compiler_specific.h"
 #include "base/string_util.h"
@@ skipping 37 matching lines @@
 //----------------------------------------------------------------------------
 // PassiveLogCollector
 //----------------------------------------------------------------------------
 
 PassiveLogCollector::PassiveLogCollector()
     : ThreadSafeObserver(net::NetLog::LOG_BASIC),
       ALLOW_THIS_IN_INITIALIZER_LIST(connect_job_tracker_(this)),
       ALLOW_THIS_IN_INITIALIZER_LIST(url_request_tracker_(this)),
       ALLOW_THIS_IN_INITIALIZER_LIST(socket_stream_tracker_(this)),
       ALLOW_THIS_IN_INITIALIZER_LIST(http_stream_job_tracker_(this)),
+      ALLOW_THIS_IN_INITIALIZER_LIST(
+          exponential_backoff_throttling_tracker_(this)),
       num_events_seen_(0) {
 
   // Define the mapping between source types and the tracker objects.
   memset(&trackers_[0], 0, sizeof(trackers_));
   trackers_[net::NetLog::SOURCE_NONE] = &global_source_tracker_;
   trackers_[net::NetLog::SOURCE_URL_REQUEST] = &url_request_tracker_;
   trackers_[net::NetLog::SOURCE_SOCKET_STREAM] = &socket_stream_tracker_;
   trackers_[net::NetLog::SOURCE_CONNECT_JOB] = &connect_job_tracker_;
   trackers_[net::NetLog::SOURCE_SOCKET] = &socket_tracker_;
   trackers_[net::NetLog::SOURCE_INIT_PROXY_RESOLVER] =
       &init_proxy_resolver_tracker_;
   trackers_[net::NetLog::SOURCE_SPDY_SESSION] = &spdy_session_tracker_;
   trackers_[net::NetLog::SOURCE_HOST_RESOLVER_IMPL_REQUEST] =
       &dns_request_tracker_;
   trackers_[net::NetLog::SOURCE_HOST_RESOLVER_IMPL_JOB] = &dns_job_tracker_;
   trackers_[net::NetLog::SOURCE_DISK_CACHE_ENTRY] = &disk_cache_entry_tracker_;
   trackers_[net::NetLog::SOURCE_MEMORY_CACHE_ENTRY] = &mem_cache_entry_tracker_;
   trackers_[net::NetLog::SOURCE_HTTP_STREAM_JOB] = &http_stream_job_tracker_;
+  trackers_[net::NetLog::SOURCE_EXPONENTIAL_BACKOFF_THROTTLING] =
+      &exponential_backoff_throttling_tracker_;
   // Make sure our mapping is up-to-date.
   for (size_t i = 0; i < arraysize(trackers_); ++i)
     DCHECK(trackers_[i]) << "Unhandled SourceType: " << i;
 }
 
 PassiveLogCollector::~PassiveLogCollector() {
 }
 
 void PassiveLogCollector::OnAddEntry(
     net::NetLog::EventType type,
@@ skipping 551 matching lines @@
   AddEntryToSourceInfo(entry, out_info);
 
   // If the request has ended, move it to the graveyard.
   if (entry.type == net::NetLog::TYPE_HTTP_STREAM_JOB &&
       entry.phase == net::NetLog::PHASE_END) {
     return ACTION_MOVE_TO_GRAVEYARD;
   }
 
   return ACTION_NONE;
 }
+
+//----------------------------------------------------------------------------
+// ExponentialBackoffThrottlingTracker
+//----------------------------------------------------------------------------
+
+const size_t PassiveLogCollector::
+    ExponentialBackoffThrottlingTracker::kMaxNumSources = 100;
+const size_t PassiveLogCollector::
+    ExponentialBackoffThrottlingTracker::kMaxGraveyardSize = 25;
+
+PassiveLogCollector::
+    ExponentialBackoffThrottlingTracker::ExponentialBackoffThrottlingTracker(
+        PassiveLogCollector* parent)
+        : SourceTracker(kMaxNumSources, kMaxGraveyardSize, parent) {
+}
+
+PassiveLogCollector::SourceTracker::Action
+PassiveLogCollector::ExponentialBackoffThrottlingTracker::DoAddEntry(
+    const ChromeNetLog::Entry& entry, SourceInfo* out_info) {
+  AddEntryToSourceInfo(entry, out_info);
+  return ACTION_NONE;
+}