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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 "base/metrics/histogram.h" | |
8 #include "base/metrics/sparse_histogram.h" | |
9 #include "net/base/load_flags.h" | |
10 | |
11 using base::TimeDelta; | |
Alexei Svitkine (slow)
2014/02/07 18:24:22
Nit: Either remove this, or remove the namespace p
Steven Holte
2014/02/07 21:08:16
Done.
| |
12 | |
13 namespace { | |
14 | |
15 // The delay, in seconds, between uploading when there are queued logs to send. | |
16 const int kUnsentLogsIntervalSeconds = 3; | |
17 | |
18 // When uploading metrics to the server fails, we progressively wait longer and | |
19 // longer before sending the next log. This backoff process helps reduce load | |
20 // on a server that is having issues. | |
21 // The following is the multiplier we use to expand that inter-log duration. | |
22 const double kBackoffMultiplier = 1.1; | |
23 | |
24 // The maximum backoff multiplier. | |
25 const int kMaxBackoffIntervalSeconds = 60 * 60; | |
26 | |
27 // The maximum number of unsent logs we will keep. | |
28 // TODO(holte): Limit based on log size instead. | |
29 const size_t kMaxQueuedLogs = 10; | |
30 | |
31 enum DiscardReason { | |
32 UPLOAD_SUCCESS, | |
33 UPLOAD_REJECTED, | |
34 QUEUE_OVERFLOW, | |
35 NUM_DISCARD_REASONS | |
36 }; | |
37 | |
38 } // namespace | |
39 | |
40 namespace rappor { | |
41 | |
42 LogUploader::LogUploader(const GURL& server_url, | |
43 const std::string& mime_type, | |
44 net::URLRequestContextGetter* request_context) | |
45 : server_url_(server_url), | |
46 mime_type_(mime_type), | |
47 request_context_(request_context), | |
48 has_callback_pending_(false), | |
49 upload_interval_(TimeDelta::FromSeconds(kUnsentLogsIntervalSeconds)) { | |
50 } | |
51 | |
52 LogUploader::~LogUploader() {} | |
53 | |
54 void LogUploader::QueueLog(const std::string& log) { | |
55 queued_logs_.push(log); | |
56 if (!IsUploadScheduled() && !has_callback_pending_) | |
57 StartScheduledUpload(); | |
58 } | |
59 | |
60 bool LogUploader::IsUploadScheduled() const { | |
61 return upload_timer_.IsRunning(); | |
62 } | |
63 | |
64 void LogUploader::ScheduleNextUpload(base::TimeDelta interval) { | |
65 if (IsUploadScheduled() || has_callback_pending_) | |
66 return; | |
67 | |
68 upload_timer_.Start( | |
69 FROM_HERE, interval, this, &LogUploader::StartScheduledUpload); | |
70 } | |
71 | |
72 void LogUploader::StartScheduledUpload() { | |
73 DCHECK(!has_callback_pending_); | |
74 has_callback_pending_ = true; | |
75 current_fetch_.reset( | |
76 net::URLFetcher::Create(server_url_, net::URLFetcher::POST, this)); | |
77 current_fetch_->SetRequestContext(request_context_.get()); | |
78 current_fetch_->SetUploadData(mime_type_, queued_logs_.front()); | |
79 | |
80 // We already drop cookies server-side, but we might as well strip them out | |
81 // client-side as well. | |
82 current_fetch_->SetLoadFlags(net::LOAD_DO_NOT_SAVE_COOKIES | | |
83 net::LOAD_DO_NOT_SEND_COOKIES); | |
84 current_fetch_->Start(); | |
85 } | |
86 | |
87 void LogUploader::OnURLFetchComplete(const net::URLFetcher* source) { | |
88 // We're not allowed to re-use the existing |URLFetcher|s, so free them here. | |
89 // Note however that |source| is aliased to the fetcher, so we should be | |
90 // careful not to delete it too early. | |
91 DCHECK_EQ(current_fetch_.get(), source); | |
92 scoped_ptr<net::URLFetcher> fetch(current_fetch_.Pass()); | |
93 | |
94 int response_code = source->GetResponseCode(); | |
95 | |
96 // Log a histogram to track response success vs. failure rates. | |
97 UMA_HISTOGRAM_SPARSE_SLOWLY("Rappor.UploadResponseCode", response_code); | |
98 | |
99 bool upload_succeeded = response_code == 200; | |
100 | |
101 // Determine whether this log should be retransmitted. | |
102 DiscardReason reason = NUM_DISCARD_REASONS; | |
103 if (upload_succeeded) { | |
104 reason = UPLOAD_SUCCESS; | |
105 } else if (response_code == 400) { | |
106 reason = UPLOAD_REJECTED; | |
107 } else if (queued_logs_.size() > kMaxQueuedLogs) { | |
108 reason = QUEUE_OVERFLOW; | |
109 } | |
110 | |
111 if (reason != NUM_DISCARD_REASONS) { | |
112 UMA_HISTOGRAM_ENUMERATION("Rappor.DiscardReason", | |
113 reason, | |
114 NUM_DISCARD_REASONS); | |
115 queued_logs_.pop(); | |
116 } | |
117 | |
118 // Error 400 indicates a problem with the log, not with the server, so | |
119 // don't consider that a sign that the server is in trouble. | |
120 bool server_is_healthy = upload_succeeded || response_code == 400; | |
121 OnUploadFinished(server_is_healthy, !queued_logs_.empty()); | |
122 } | |
123 | |
124 void LogUploader::OnUploadFinished(bool server_is_healthy, | |
125 bool more_logs_remaining) { | |
126 DCHECK(has_callback_pending_); | |
127 has_callback_pending_ = false; | |
128 // If the server is having issues, back off. Otherwise, reset to default. | |
129 if (!server_is_healthy) | |
130 upload_interval_ = BackOffUploadInterval(upload_interval_); | |
131 else | |
132 upload_interval_ = TimeDelta::FromSeconds(kUnsentLogsIntervalSeconds); | |
133 | |
134 if (more_logs_remaining) | |
135 ScheduleNextUpload(upload_interval_); | |
136 } | |
137 | |
138 // static | |
139 base::TimeDelta LogUploader::BackOffUploadInterval(base::TimeDelta interval) { | |
140 DCHECK_GT(kBackoffMultiplier, 1.0); | |
141 interval = TimeDelta::FromMicroseconds(static_cast<int64>( | |
142 kBackoffMultiplier * interval.InMicroseconds())); | |
143 | |
144 TimeDelta max_interval = TimeDelta::FromSeconds(kMaxBackoffIntervalSeconds); | |
145 return interval > max_interval ? max_interval : interval; | |
146 } | |
147 | |
148 } // namespace rappor | |
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