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| 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/rappor/log_uploader.h" |
| 6 |
| 7 #include "net/base/load_flags.h" |
| 8 #include "url/gurl.h" |
| 9 |
| 10 using base::TimeDelta; |
| 11 |
| 12 namespace { |
| 13 |
| 14 // The delay, in seconds, between uploading when there are queued logs to send. |
| 15 const int kUnsentLogsIntervalSeconds = 3; |
| 16 |
| 17 // When uploading metrics to the server fails, we progressively wait longer and |
| 18 // longer before sending the next log. This backoff process helps reduce load |
| 19 // on a server that is having issues. |
| 20 // The following is the multiplier we use to expand that inter-log duration. |
| 21 const double kBackoffMultiplier = 1.1; |
| 22 |
| 23 // The maximum backoff multiplier. |
| 24 const int kMaxBackoffMultiplier = 10; |
| 25 |
| 26 // If an upload fails, and the transmission was over this byte count, then we |
| 27 // will discard the log, and not try to retransmit it. |
| 28 const size_t kUploadLogAvoidRetransmitSize = 50000; |
| 29 |
| 30 // The maximum number of unsent logs we will keep. |
| 31 // TODO(holte): Limit based on log size instead. |
| 32 const size_t kMaxQueuedLogs = 10; |
| 33 |
| 34 } // namespace |
| 35 |
| 36 namespace rappor { |
| 37 |
| 38 LogUploader::LogUploader(const std::string& server_url, |
| 39 const std::string& mime_type, |
| 40 net::URLRequestContextGetter* request_context) |
| 41 : server_url_(server_url), |
| 42 mime_type_(mime_type), |
| 43 request_context_(request_context), |
| 44 has_callback_pending_(false), |
| 45 upload_interval_(TimeDelta::FromSeconds(kUnsentLogsIntervalSeconds)) { |
| 46 } |
| 47 |
| 48 LogUploader::~LogUploader() {} |
| 49 |
| 50 void LogUploader::QueueLog(const std::string& log) { |
| 51 queued_logs_.push(log); |
| 52 if (!upload_timer_.IsRunning() && !has_callback_pending_) |
| 53 StartScheduledUpload(); |
| 54 } |
| 55 |
| 56 void LogUploader::ScheduleNextUpload() { |
| 57 if (upload_timer_.IsRunning() || has_callback_pending_) |
| 58 return; |
| 59 |
| 60 upload_timer_.Start( |
| 61 FROM_HERE, upload_interval_, this, &LogUploader::StartScheduledUpload); |
| 62 } |
| 63 |
| 64 void LogUploader::StartScheduledUpload() { |
| 65 has_callback_pending_ = true; |
| 66 current_fetch_.reset( |
| 67 net::URLFetcher::Create(GURL(server_url_), net::URLFetcher::POST, this)); |
| 68 current_fetch_->SetRequestContext(request_context_.get()); |
| 69 current_fetch_->SetUploadData(mime_type_, queued_logs_.front()); |
| 70 |
| 71 // We already drop cookies server-side, but we might as well strip them out |
| 72 // client-side as well. |
| 73 current_fetch_->SetLoadFlags(net::LOAD_DO_NOT_SAVE_COOKIES | |
| 74 net::LOAD_DO_NOT_SEND_COOKIES); |
| 75 current_fetch_->Start(); |
| 76 } |
| 77 |
| 78 void LogUploader::OnURLFetchComplete(const net::URLFetcher* source) { |
| 79 // We're not allowed to re-use the existing |URLFetcher|s, so free them here. |
| 80 // Note however that |source| is aliased to the fetcher, so we should be |
| 81 // careful not to delete it too early. |
| 82 DCHECK_EQ(current_fetch_.get(), source); |
| 83 scoped_ptr<net::URLFetcher> s(current_fetch_.Pass()); |
| 84 |
| 85 int response_code = source->GetResponseCode(); |
| 86 |
| 87 bool upload_succeeded = response_code == 200; |
| 88 |
| 89 // Provide boolean for error recovery (allow us to ignore response_code). |
| 90 bool discard_log = false; |
| 91 const size_t log_size = queued_logs_.front().length(); |
| 92 if (!upload_succeeded && log_size > kUploadLogAvoidRetransmitSize) { |
| 93 discard_log = true; |
| 94 } else if (queued_logs_.size() > kMaxQueuedLogs) { |
| 95 discard_log = true; |
| 96 } else if (response_code == 400) { |
| 97 // Bad syntax. Retransmission won't work. |
| 98 discard_log = true; |
| 99 } |
| 100 |
| 101 if (upload_succeeded || discard_log) |
| 102 queued_logs_.pop(); |
| 103 |
| 104 // Error 400 indicates a problem with the log, not with the server, so |
| 105 // don't consider that a sign that the server is in trouble. |
| 106 bool server_is_healthy = upload_succeeded || response_code == 400; |
| 107 UploadFinished(server_is_healthy, !queued_logs_.empty()); |
| 108 } |
| 109 |
| 110 void LogUploader::UploadFinished(bool server_is_healthy, |
| 111 bool more_logs_remaining) { |
| 112 DCHECK(has_callback_pending_); |
| 113 has_callback_pending_ = false; |
| 114 // If the server is having issues, back off. Otherwise, reset to default. |
| 115 if (!server_is_healthy) |
| 116 BackOffUploadInterval(); |
| 117 else |
| 118 upload_interval_ = TimeDelta::FromSeconds(kUnsentLogsIntervalSeconds); |
| 119 |
| 120 if (more_logs_remaining) |
| 121 ScheduleNextUpload(); |
| 122 } |
| 123 |
| 124 void LogUploader::BackOffUploadInterval() { |
| 125 DCHECK_GT(kBackoffMultiplier, 1.0); |
| 126 upload_interval_ = TimeDelta::FromMicroseconds(static_cast<int64>( |
| 127 kBackoffMultiplier * upload_interval_.InMicroseconds())); |
| 128 |
| 129 TimeDelta max_interval = kMaxBackoffMultiplier * |
| 130 TimeDelta::FromSeconds(kUnsentLogsIntervalSeconds); |
| 131 if (upload_interval_ > max_interval || upload_interval_.InSeconds() < 0) |
| 132 upload_interval_ = max_interval; |
| 133 } |
| 134 |
| 135 } // namespace rappor |
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