Implement chromeos::SimpleGeolocationProvider.

Implement chromeos::SimpleGeolocationProvider to be used in ChromeOS
code instead of WEB geolocation.

BUG=356270
TEST=manual

Review URL: https://codereview.chromium.org/237963004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@264913 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 111 insertions, 0 deletions

diff --git a/chrome/browser/chromeos/geolocation/simple_geolocation_request.h b/chrome/browser/chromeos/geolocation/simple_geolocation_request.h
new file mode 100644
index 0000000..3cc47e3
--- /dev/null
+++ b/chrome/browser/chromeos/geolocation/simple_geolocation_request.h
@@ -0,0 +1,111 @@
+// 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.
+
+#ifndef CHROME_BROWSER_CHROMEOS_GEOLOCATION_SIMPLE_GEOLOCATION_REQUEST_H_
+#define CHROME_BROWSER_CHROMEOS_GEOLOCATION_SIMPLE_GEOLOCATION_REQUEST_H_
+
+#include "base/basictypes.h"
+#include "base/callback.h"
+#include "base/compiler_specific.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/threading/thread_checker.h"
+#include "base/timer/timer.h"
+#include "chrome/browser/chromeos/geolocation/geoposition.h"
+#include "net/url_request/url_fetcher.h"
+#include "net/url_request/url_fetcher_delegate.h"
+#include "url/gurl.h"
+
+namespace net {
+class URLRequestContextGetter;
+}
+
+namespace chromeos {
+
+// Sends request to a server to get local geolocation information.
+// It performs formatting of the request and interpretation of the response.
+// Request is owned and destroyed by caller (usually SimpleGeolocationProvider).
+// - If error occurs, request is retried until timeout.
+// - On successul response, callback is called.
+// - On timeout, callback with last (failed) position is called.
+// (position.status is set to STATUS_TIMEOUT.)
+// - If request is destroyed while callback has not beed called yet, request
+// is silently cancelled.
+class SimpleGeolocationRequest : private net::URLFetcherDelegate {
+ public:
+  // Called when a new geo geolocation information is available.
+  // The second argument indicates whether there was a server error or not.
+  // It is true when there was a server or network error - either no response
+  // or a 500 error code.
+  typedef base::Callback<void(const Geoposition& /* position*/,
+                              bool /* server_error */,
+                              const base::TimeDelta elapsed)> ResponseCallback;
+
+  // |url| is the server address to which the request wil be sent.
+  // |timeout| retry request on error until timeout.
+  SimpleGeolocationRequest(net::URLRequestContextGetter* url_context_getter,
+                           const GURL& service_url,
+                           base::TimeDelta timeout);
+
+  virtual ~SimpleGeolocationRequest();
+
+  // Initiates request.
+  // Note: if request object is destroyed before callback is called,
+  // request will be silently cancelled.
+  void MakeRequest(const ResponseCallback& callback);
+
+ private:
+  // net::URLFetcherDelegate
+  virtual void OnURLFetchComplete(const net::URLFetcher* source) OVERRIDE;
+
+  // Start new request.
+  void StartRequest();
+
+  // Schedules retry.
+  void Retry(bool server_error);
+
+  // Run callback and destroy "this".
+  void ReplyAndDestroySelf(const base::TimeDelta elapsed, bool server_error);
+
+  // Called by timeout_timer_ .
+  void OnTimeout();
+
+  scoped_refptr<net::URLRequestContextGetter> url_context_getter_;
+
+  // Service URL from constructor arguments.
+  const GURL service_url_;
+
+  ResponseCallback callback_;
+
+  // Actual URL with parameters.
+  GURL request_url_;
+
+  scoped_ptr<net::URLFetcher> url_fetcher_;
+
+  // When request was actually started.
+  base::Time request_started_at_;
+
+  const base::TimeDelta timeout_;
+
+  // Pending retry.
+  base::OneShotTimer<SimpleGeolocationRequest> request_scheduled_;
+
+  // Stop request on timeout.
+  base::OneShotTimer<SimpleGeolocationRequest> timeout_timer_;
+
+  // Number of retry attempts.
+  unsigned retries_;
+
+  // This is updated on each retry.
+  Geoposition position_;
+
+  // Creation and destruction should happen on the same thread.
+  base::ThreadChecker thread_checker_;
+
+  DISALLOW_COPY_AND_ASSIGN(SimpleGeolocationRequest);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_GEOLOCATION_SIMPLE_GEOLOCATION_REQUEST_H_