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// Copyright 2014 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 <list>
#include <vector>
#include "base/macros.h"
#include "net/base/net_export.h"
#include "net/spdy/spdy_header_block.h"
#include "net/spdy/spdy_protocol.h"
#include "net/spdy/spdy_session_key.h"
namespace net {
class HpackEncoder;
class HttpRequestHeaders;
struct HttpRequestInfo;
class HttpResponseHeaders;
class ProxyServer;
namespace test {
class HpackHuffmanAggregatorPeer;
} // namespace test
class NET_EXPORT_PRIVATE HpackHuffmanAggregator {
public:
friend class test::HpackHuffmanAggregatorPeer;
HpackHuffmanAggregator();
~HpackHuffmanAggregator();
// Encodes the request and response headers of the transaction with an
// HpackEncoder keyed on the transaction's SpdySessionKey. Literal headers
// emitted by that encoder are aggregated into internal character counts,
// which are periodically published to a UMA histogram.
void AggregateTransactionCharacterCounts(
const HttpRequestInfo& request,
const HttpRequestHeaders& request_headers,
const ProxyServer& proxy,
const HttpResponseHeaders& response_headers);
// Returns whether the aggregator is enabled for the session by a field trial.
static bool UseAggregator();
private:
typedef std::pair<SpdySessionKey, HpackEncoder*> OriginEncoder;
typedef std::list<OriginEncoder> OriginEncoders;
// Returns true if the request is considered cross-origin,
// and should not be aggregated.
static bool IsCrossOrigin(const HttpRequestInfo& request);
// Converts |headers| into SPDY headers block |headers_out|.
static void CreateSpdyHeadersFromHttpResponse(
const HttpResponseHeaders& headers,
SpdyHeaderBlock* headers_out);
// Creates or returns an encoder for the origin key.
HpackEncoder* ObtainEncoder(const SpdySessionKey& key);
// Publishes aggregated counts to a UMA histogram.
void PublishCounts();
std::vector<size_t> counts_;
size_t total_counts_;
OriginEncoders encoders_;
size_t max_encoders_;
DISALLOW_COPY_AND_ASSIGN(HpackHuffmanAggregator);
};
} // namespace net
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