root/chrome/browser/component_updater/test/url_request_post_interceptor.h

INCLUDED FROM

// Copyright 2013 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.

#ifndef CHROME_BROWSER_COMPONENT_UPDATER_TEST_URL_REQUEST_POST_INTERCEPTOR_H_
#define CHROME_BROWSER_COMPONENT_UPDATER_TEST_URL_REQUEST_POST_INTERCEPTOR_H_

#include <map>
#include <queue>
#include <string>
#include <utility>
#include <vector>
#include "base/basictypes.h"
#include "base/synchronization/lock.h"
#include "url/gurl.h"

namespace base {
class FilePath;
}

namespace net {
class URLRequest;
}

namespace component_updater {

// Intercepts requests to a file path, counts them, and captures the body of
// the requests. Optionally, for each request, it can return a canned response
// from a given file. The class maintains a queue of expectations, and returns
// one and only one response for each request that matches and it is
// intercepted.
class URLRequestPostInterceptor {
 public:
  // Allows a generic string maching interface when setting up expectations.
  class RequestMatcher {
   public:
    virtual bool Match(const std::string& actual) const = 0;
    virtual ~RequestMatcher() {}
  };

  // Returns the url that is intercepted.
  GURL GetUrl() const;

  // Sets an expection for the body of the POST request and optionally,
  // provides a canned response identified by a |file_path| to be returned when
  // the expectation is met. If no |file_path| is provided, then an empty
  // response body is served. This class takes ownership of the
  // |request_matcher| object. Returns |true| if the expectation was set.
  bool ExpectRequest(class RequestMatcher* request_matcher);
  bool ExpectRequest(class RequestMatcher* request_matcher,
                     const base::FilePath& filepath);

  // Returns how many requests have been intercepted and matched by
  // an expectation. One expectation can only be matched by one request.
  int GetHitCount() const;

  // Returns how many requests in total have been captured by the interceptor.
  int GetCount() const;

  // Returns all requests that have been intercepted, matched or not.
  std::vector<std::string> GetRequests() const;

  // Returns all requests as a string for debugging purposes.
  std::string GetRequestsAsString() const;

  // Resets the state of the interceptor so that new expectations can be set.
  void Reset();

  class Delegate;

 private:
  friend class URLRequestPostInterceptorFactory;
  typedef std::pair<const RequestMatcher*, std::string> Expectation;

  explicit URLRequestPostInterceptor(const GURL& url);
  ~URLRequestPostInterceptor();

  void ClearExpectations();
  const GURL url_;

  mutable base::Lock interceptor_lock_;
  mutable int hit_count_;
  mutable std::vector<std::string> requests_;
  mutable std::queue<Expectation> expectations_;

  DISALLOW_COPY_AND_ASSIGN(URLRequestPostInterceptor);
};

class URLRequestPostInterceptorFactory {
 public:
  URLRequestPostInterceptorFactory(const std::string& scheme,
                                   const std::string& hostname);
  ~URLRequestPostInterceptorFactory();

  // Creates an interceptor object for the specified url path. Returns NULL
  // in case of errors or a valid interceptor object otherwise. The caller
  // does not own the returned object.
  URLRequestPostInterceptor* CreateInterceptor(const base::FilePath& filepath);

 private:
  const std::string scheme_;
  const std::string hostname_;

  // After creation, |delegate_| lives on the IO thread and it is owned by
  // a URLRequestFilter after registration. A task to unregister it and
  // implicitly destroy it is posted from ~URLRequestPostInterceptorFactory().
  URLRequestPostInterceptor::Delegate* delegate_;

  DISALLOW_COPY_AND_ASSIGN(URLRequestPostInterceptorFactory);
};

}  // namespace component_updater

#endif  // CHROME_BROWSER_COMPONENT_UPDATER_TEST_URL_REQUEST_POST_INTERCEPTOR_H_