experiment_util.h

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/*
 * Copyright 2012 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http:///www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


#ifndef NET_INSTAWEB_REWRITER_PUBLIC_EXPERIMENT_UTIL_H_
#define NET_INSTAWEB_REWRITER_PUBLIC_EXPERIMENT_UTIL_H_

#include "pagespeed/kernel/base/basictypes.h"
#include "pagespeed/kernel/base/string.h"
#include "pagespeed/kernel/base/string_util.h"

namespace net_instaweb {

class RequestHeaders;
class ResponseHeaders;
class RewriteOptions;
class UserAgentMatcher;

namespace experiment {

enum ExperimentState {
  kForceNoExperiment = -2,
  kExperimentNotSet = -1,
  kNoExperiment = 0,
};

const char kExperimentCookie[] = "PageSpeedExperiment";
const char kExperimentCookiePrefix[] = "PageSpeedExperiment=";

bool GetExperimentCookieState(const RequestHeaders& headers, int* value);

void RemoveExperimentCookie(RequestHeaders *headers);

void SetExperimentCookie(ResponseHeaders* headers, int state,
                         const StringPiece& url, int64 expiration_time_ms);

int DetermineExperimentState(const RewriteOptions* options,
                             const RequestHeaders& headers,
                             const UserAgentMatcher& matcher);

bool AnyActiveExperiments(const RewriteOptions* options);

GoogleString ExperimentStateToCookieString(int state);

int CookieStringToState(const StringPiece& cookie_str);

}  

}  

#endif