Adding the Copresence RpcHandler and HttpPost helper.

components/copresence/rpc/http_post.cc

+// 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.
+
+#include "components/copresence/rpc/http_post.h"
+
+#include <google/protobuf/message_lite.h>
+
+#include "base/bind.h"
+#include "base/command_line.h"
+#include "components/copresence/copresence_switches.h"
+#include "content/public/browser/browser_context.h"
+#include "google_apis/google_api_keys.h"
+#include "net/base/load_flags.h"
+#include "net/base/url_util.h"
+#include "net/http/http_status_code.h"
+#include "net/url_request/url_fetcher.h"
+#include "net/url_request/url_request_context_getter.h"
+
+namespace copresence {
+
+namespace {
+
+const char kTracingTokenField[] = "trace";
+const char kApiKeyField[] = "key";
+
+}  // namespace
+
+HttpPost::HttpPost(net::URLRequestContextGetter* url_context_getter,
+                   const std::string& server_host,
+                   const std::string& rpc_name,
+                   const google::protobuf::MessageLite& request_proto,
+                   const ResponseCallback& response_callback)
+                   : response_callback_(response_callback) {
+  // Create the base URL to call.
+  GURL url(server_host + "/" + rpc_name);
+
+  // Add the Chrome API key.
+  // TODO(ckehoe): Replace this with an app-specific key
+  //               once the server API supports it.
+  DCHECK(google_apis::HasKeysConfigured());
+  url = net::AppendQueryParameter(url, kApiKeyField, google_apis::GetAPIKey());
+
+  // Add the tracing token, if specified.
+  CommandLine* command_line = CommandLine::ForCurrentProcess();
+  if (command_line->HasSwitch(switches::kCopresenceTracingToken)) {
+    url = net::AppendQueryParameter(
+        url,
+        kTracingTokenField,
+        "token:" + command_line->GetSwitchValueASCII(
+            switches::kCopresenceTracingToken));
+  }
+
+  // Serialize the proto for transmission.
+  std::string request_data;
+  DCHECK(request_proto.SerializeToString(&request_data));
+
+  // Configure and send the request.
+  url_fetcher_.reset(net::URLFetcher::Create(
+      kUrlFetcherId, url, net::URLFetcher::POST, this));
+  url_fetcher_->SetRequestContext(url_context_getter);
+  url_fetcher_->SetLoadFlags(net::LOAD_BYPASS_CACHE |
+                             net::LOAD_DISABLE_CACHE |
+                             net::LOAD_DO_NOT_SAVE_COOKIES |
+                             net::LOAD_DO_NOT_SEND_COOKIES |
+                             net::LOAD_DO_NOT_SEND_AUTH_DATA);
+  url_fetcher_->SetUploadData("application/x-protobuf", request_data);
+  url_fetcher_->Start();
+}
+
+HttpPost::~HttpPost() {}
+
+void HttpPost::Cancel() {
+  url_fetcher_.reset();

[Daniel Erat, 2014/08/07 17:55:22]

why do you need to explicitly reset this? it's a scoped_ptr, so it should
already be destroyed when you delete the HttpPost

[Charlie, 2014/08/07 18:00:03]

Good point. Replacing with a comment.

+  delete this;
+}
+
+void HttpPost::OnURLFetchComplete(const net::URLFetcher* source) {
+  DCHECK_EQ(url_fetcher_.get(), source);
+
+  // Gather response info.
+  std::string response;
+  source->GetResponseAsString(&response);
+  int response_code = source->GetResponseCode();
+
+  // Log any errors.
+  if (response_code < 0) {
+    LOG(ERROR) << "Couldn't contact the Copresence server at "
+               << source->GetURL();
+  } else if (response_code != net::HTTP_OK) {
+    LOG(ERROR) << "Copresence request got HTTP response code " << response_code
+               << ". Response:\n" << response;
+  }
+
+  // Return the response.
+  response_callback_.Run(response_code, response, this);
+  delete this;
+}
+
+}  // namespace copresence