components/gcm_driver/gcm_channel_status_request.cc

   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 #include "components/gcm_driver/gcm_channel_status_request.h"
   6
   7 #include "base/bind.h"
   8 #include "base/message_loop/message_loop.h"
   9 #include "components/gcm_driver/gcm_backoff_policy.h"
  10 #include "net/base/escape.h"
  11 #include "net/base/load_flags.h"
  12 #include "net/http/http_status_code.h"
  13 #include "net/url_request/url_fetcher.h"
  14 #include "net/url_request/url_request_status.h"
  15 #include "sync/protocol/experiment_status.pb.h"
  16 #include "url/gurl.h"
  17
  18 namespace gcm {
  19
  20 namespace {
  21
  22 const char kRequestContentType[] = "application/octet-stream";
  23 const char kGCMChannelTag[] = "gcm_channel";
  24 const int kDefaultPollIntervalSeconds = 60 * 60;  // 60 minutes.
  25 const int kMinPollIntervalSeconds = 30 * 60;  // 30 minutes.
  26
  27 }  // namespace
  28
  29 GCMChannelStatusRequest::GCMChannelStatusRequest(
  30     const scoped_refptr<net::URLRequestContextGetter>& request_context_getter,
  31     const std::string& channel_status_request_url,
  32     const std::string& user_agent,
  33     const GCMChannelStatusRequestCallback& callback)
  34     : request_context_getter_(request_context_getter),
  35       channel_status_request_url_(channel_status_request_url),
  36       user_agent_(user_agent),
  37       callback_(callback),
  38       backoff_entry_(&(GetGCMBackoffPolicy())),
  39       weak_ptr_factory_(this) {
  40 }
  41
  42 GCMChannelStatusRequest::~GCMChannelStatusRequest() {
  43 }
  44
  45 // static
  46 int GCMChannelStatusRequest::default_poll_interval_seconds() {
  47   return kDefaultPollIntervalSeconds;
  48 }
  49
  50 // static
  51 int GCMChannelStatusRequest::min_poll_interval_seconds() {
  52   return kMinPollIntervalSeconds;
  53 }
  54
  55 void GCMChannelStatusRequest::Start() {
  56   DCHECK(!url_fetcher_.get());
  57
  58   GURL request_url(channel_status_request_url_);
  59
  60   sync_pb::ExperimentStatusRequest proto_data;
  61   proto_data.add_experiment_name(kGCMChannelTag);
  62   std::string upload_data;
  63   if (!proto_data.SerializeToString(&upload_data)) {
  64      NOTREACHED();
  65   }
  66
  67   url_fetcher_.reset(
  68       net::URLFetcher::Create(request_url, net::URLFetcher::POST, this));
  69   url_fetcher_->SetRequestContext(request_context_getter_.get());
  70   url_fetcher_->AddExtraRequestHeader("User-Agent: " + user_agent_);
  71   url_fetcher_->SetUploadData(kRequestContentType, upload_data);
  72   url_fetcher_->SetLoadFlags(net::LOAD_DO_NOT_SEND_COOKIES |
  73                              net::LOAD_DO_NOT_SAVE_COOKIES);
  74   url_fetcher_->Start();
  75 }
  76
  77 void GCMChannelStatusRequest::OnURLFetchComplete(
  78     const net::URLFetcher* source) {
  79   if (ParseResponse(source))
  80     return;
  81
  82   RetryWithBackoff(true);
  83 }
  84
  85 bool GCMChannelStatusRequest::ParseResponse(const net::URLFetcher* source) {
  86   if (!source->GetStatus().is_success()) {
  87     LOG(ERROR) << "GCM channel request failed.";
  88     return false;
  89   }
  90
  91   if (source->GetResponseCode() != net::HTTP_OK) {
  92     LOG(ERROR) << "GCM channel request failed. HTTP status: "
  93                << source->GetResponseCode();
  94     return false;
  95   }
  96
  97   std::string response_string;
  98   if (!source->GetResponseAsString(&response_string)) {
  99     LOG(ERROR) << "GCM channel response failed to be retrieved.";
 100     return false;
 101   }
 102
 103   // Empty response means to keep the existing values.
 104   if (response_string.empty()) {
 105     callback_.Run(false, false, 0);
 106     return true;
 107   }
 108
 109   sync_pb::ExperimentStatusResponse response_proto;
 110   if (!response_proto.ParseFromString(response_string)) {
 111     LOG(ERROR) << "GCM channel response failed to be parsed as proto.";
 112     return false;
 113   }
 114
 115   bool enabled = true;
 116   if (response_proto.experiment_size() == 1 &&
 117       response_proto.experiment(0).has_gcm_channel() &&
 118       response_proto.experiment(0).gcm_channel().has_enabled()) {
 119     enabled = response_proto.experiment(0).gcm_channel().enabled();
 120   }
 121
 122   int poll_interval_seconds;
 123   if (response_proto.has_poll_interval_seconds())
 124     poll_interval_seconds = response_proto.poll_interval_seconds();
 125   else
 126     poll_interval_seconds = kDefaultPollIntervalSeconds;
 127   if (poll_interval_seconds < kMinPollIntervalSeconds)
 128     poll_interval_seconds = kMinPollIntervalSeconds;
 129
 130   callback_.Run(true, enabled, poll_interval_seconds);
 131
 132   return true;
 133 }
 134
 135 void GCMChannelStatusRequest::RetryWithBackoff(bool update_backoff) {
 136   if (update_backoff) {
 137     url_fetcher_.reset();
 138     backoff_entry_.InformOfRequest(false);
 139   }
 140
 141   if (backoff_entry_.ShouldRejectRequest()) {
 142     DVLOG(1) << "Delaying GCM channel request for "
 143              << backoff_entry_.GetTimeUntilRelease().InMilliseconds()
 144              << " ms.";
 145     base::MessageLoop::current()->PostDelayedTask(
 146         FROM_HERE,
 147         base::Bind(&GCMChannelStatusRequest::RetryWithBackoff,
 148                    weak_ptr_factory_.GetWeakPtr(),
 149                    false),
 150         backoff_entry_.GetTimeUntilRelease());
 151     return;
 152   }
 153
 154   Start();
 155 }
 156
 157 }  // namespace gcm