| // Copyright 2017 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 COMPONENTS_DOODLE_DOODLE_FETCHER_IMPL_H_ |
| #define COMPONENTS_DOODLE_DOODLE_FETCHER_IMPL_H_ |
| |
| #include <memory> |
| #include <string> |
| #include <utility> |
| #include <vector> |
| |
| #include "base/callback.h" |
| #include "base/macros.h" |
| #include "base/memory/ref_counted.h" |
| #include "base/memory/weak_ptr.h" |
| #include "base/optional.h" |
| #include "components/doodle/doodle_fetcher.h" |
| #include "components/doodle/doodle_types.h" |
| #include "net/url_request/url_fetcher_delegate.h" |
| #include "net/url_request/url_request_context_getter.h" |
| #include "url/gurl.h" |
| |
| class GoogleURLTracker; |
| |
| namespace base { |
| class DictionaryValue; |
| class TimeDelta; |
| class Value; |
| } |
| |
| namespace doodle { |
| |
| // This class provides information about any recent doodle. |
| // It works asynchronously and calls a callback when finished fetching the |
| // information from the remote enpoint. |
| class DoodleFetcherImpl : public DoodleFetcher, public net::URLFetcherDelegate { |
| public: |
| // Callback for JSON parsing to allow injecting platform-dependent code. |
| using ParseJSONCallback = base::Callback<void( |
| const std::string& unsafe_json, |
| const base::Callback<void(std::unique_ptr<base::Value> json)>& success, |
| const base::Callback<void(const std::string&)>& error)>; |
| |
| DoodleFetcherImpl( |
| scoped_refptr<net::URLRequestContextGetter> download_context, |
| GoogleURLTracker* google_url_tracker, |
| const ParseJSONCallback& json_parsing_callback, |
| bool gray_background, |
| const base::Optional<std::string>& override_url); |
| ~DoodleFetcherImpl() override; |
| |
| // Fetches a doodle asynchronously. The |callback| is called with a |
| // DoodleState indicating whether the request succeded in fetching a doodle. |
| // If a fetch is already running, the callback will be queued and invoked with |
| // result from the next completed request. |
| void FetchDoodle(FinishedCallback callback) override; |
| |
| private: |
| // net::URLFetcherDelegate implementation. |
| void OnURLFetchComplete(const net::URLFetcher* source) override; |
| |
| // ParseJSONCallback Success callback |
| void OnJsonParsed(std::unique_ptr<base::Value> json); |
| // ParseJSONCallback Failure callback |
| void OnJsonParseFailed(const std::string& error_message); |
| |
| base::Optional<DoodleConfig> ParseDoodleConfigAndTimeToLive( |
| const base::DictionaryValue& ddljson, |
| base::TimeDelta* time_to_live) const; |
| |
| void RespondToAllCallbacks(DoodleState state, |
| base::TimeDelta time_to_live, |
| const base::Optional<DoodleConfig>& config); |
| |
| GURL GetGoogleBaseUrl() const; |
| |
| // Returns whether a fetch is still in progress. A fetch begins when a |
| // callback is added and ends when the last callback was called. |
| bool IsFetchInProgress() const { return !callbacks_.empty(); } |
| |
| // Parameters set from constructor. |
| scoped_refptr<net::URLRequestContextGetter> const download_context_; |
| GoogleURLTracker* google_url_tracker_; |
| ParseJSONCallback json_parsing_callback_; |
| const bool gray_background_; |
| const base::Optional<std::string> override_url_; |
| |
| std::vector<FinishedCallback> callbacks_; |
| std::unique_ptr<net::URLFetcher> fetcher_; |
| |
| base::WeakPtrFactory<DoodleFetcherImpl> weak_ptr_factory_; |
| |
| DISALLOW_COPY_AND_ASSIGN(DoodleFetcherImpl); |
| }; |
| |
| } // namespace doodle |
| |
| #endif // COMPONENTS_DOODLE_DOODLE_FETCHER_IMPL_H_ |