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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_TRANSLATE_CORE_BROWSER_TRANSLATE_URL_FETCHER_H_
#define COMPONENTS_TRANSLATE_CORE_BROWSER_TRANSLATE_URL_FETCHER_H_
#include <memory>
#include "base/functional/callback.h"
#include "url/gurl.h"
namespace network {
class SimpleURLLoader;
}
namespace translate {
// Downloads raw Translate data such as the Translate script and the language
// list.
class TranslateURLFetcher {
public:
// Callback type for Request().
using Callback = base::OnceCallback<void(bool, const std::string&)>;
// Represents internal state if the fetch is completed successfully.
enum State {
IDLE, // No fetch request was issued.
REQUESTING, // A fetch request was issued, but not finished yet.
COMPLETED, // The last fetch request was finished successfully.
FAILED, // The last fetch request was finished with a failure.
};
TranslateURLFetcher();
TranslateURLFetcher(const TranslateURLFetcher&) = delete;
TranslateURLFetcher& operator=(const TranslateURLFetcher&) = delete;
~TranslateURLFetcher();
int max_retry_on_5xx() {
return max_retry_on_5xx_;
}
void set_max_retry_on_5xx(int count) {
max_retry_on_5xx_ = count;
}
const std::string& extra_request_header() {
return extra_request_header_;
}
void set_extra_request_header(const std::string& header) {
extra_request_header_ = header;
}
// Requests to |url|. |callback| will be invoked when the function returns
// true, and the request is finished asynchronously.
// Returns false if the previous request is not finished, or the request
// is omitted due to retry limitation. |is_incognito| is used during the fetch
// to determine which variations headers to add.
bool Request(const GURL& url, Callback callback, bool is_incognito);
// Gets internal state.
State state() { return state_; }
private:
void OnSimpleLoaderComplete(std::unique_ptr<std::string> response_body);
// URL to send the request.
GURL url_;
// Internal state.
enum State state_;
// SimpleURLLoader instance.
std::unique_ptr<network::SimpleURLLoader> simple_loader_;
// Callback passed at Request(). It will be invoked when an asynchronous
// load operation is finished.
Callback callback_;
// Counts how many times did it try to load the language list.
int retry_count_;
// Max number how many times to retry on the server error
int max_retry_on_5xx_;
// An extra HTTP request header
std::string extra_request_header_;
};
} // namespace translate
#endif // COMPONENTS_TRANSLATE_CORE_BROWSER_TRANSLATE_URL_FETCHER_H_
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