components/copresence/rpc/http_post.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef COMPONENTS_COPRESENCE_RPC_HTTP_POST_H_
   6 #define COMPONENTS_COPRESENCE_RPC_HTTP_POST_H_
   7
   8 #include <string>
   9
  10 #include "base/callback.h"
  11 #include "base/macros.h"
  12 #include "base/memory/scoped_ptr.h"
  13 #include "net/url_request/url_fetcher_delegate.h"
  14
  15 namespace google {
  16 namespace protobuf {
  17 class MessageLite;
  18 }
  19 }
  20
  21 namespace net {
  22 class URLRequestContextGetter;
  23 }
  24
  25 namespace copresence {
  26
  27 // This class handles all Apiary calls to the Copresence server.
  28 // It configures the HTTP request appropriately and reports any errors.
  29 // If deleted, the HTTP request is cancelled.
  30 //
  31 // TODO(ckehoe): Add retry logic.
  32 class HttpPost : public net::URLFetcherDelegate {
  33  public:
  34   // Callback to receive the HTTP status code and body of the response
  35   // (if any). A pointer to this HttpPost object is also passed along.
  36   typedef base::Callback<void(int, const std::string&)>
  37       ResponseCallback;
  38
  39   // Create a request to the Copresence server.
  40   // |url_context_getter| is owned by the caller,
  41   // and the context it provides must be available until the request completes.
  42   HttpPost(net::URLRequestContextGetter* url_context_getter,
  43            const std::string& server_host,
  44            const std::string& rpc_name,
  45            const std::string& tracing_token,
  46            std::string api_key,  // If blank, we overwrite with a default.
  47            const google::protobuf::MessageLite& request_proto);
  48
  49   // HTTP requests are cancelled on delete.
  50   virtual ~HttpPost();
  51
  52   // Send an HttpPost request.
  53   void Start(const ResponseCallback& response_callback);
  54
  55  private:
  56   static const int kUrlFetcherId = 1;
  57   static const char kApiKeyField[];
  58   static const char kTracingField[];
  59
  60   friend class HttpPostTest;
  61
  62   // Overridden from net::URLFetcherDelegate.
  63   virtual void OnURLFetchComplete(const net::URLFetcher* source) override;
  64
  65   ResponseCallback response_callback_;
  66
  67   scoped_ptr<net::URLFetcher> url_fetcher_;
  68
  69   DISALLOW_COPY_AND_ASSIGN(HttpPost);
  70 };
  71
  72 }  // namespace copresence
  73
  74 #endif  // COMPONENTS_COPRESENCE_RPC_HTTP_POST_H_