src/content/browser/download/download_stats.cc

   1 // Copyright (c) 2012 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 "content/browser/download/download_stats.h"
   6
   7 #include "base/metrics/histogram.h"
   8 #include "base/metrics/sparse_histogram.h"
   9 #include "base/strings/string_util.h"
  10 #include "content/browser/download/download_resource_handler.h"
  11 #include "content/public/browser/download_interrupt_reasons.h"
  12 #include "net/http/http_content_disposition.h"
  13
  14 namespace content {
  15
  16 namespace {
  17
  18 // All possible error codes from the network module. Note that the error codes
  19 // are all positive (since histograms expect positive sample values).
  20 const int kAllInterruptReasonCodes[] = {
  21 #define INTERRUPT_REASON(label, value) (value),
  22 #include "content/public/browser/download_interrupt_reason_values.h"
  23 #undef INTERRUPT_REASON
  24 };
  25
  26 // These values are based on net::HttpContentDisposition::ParseResult values.
  27 // Values other than HEADER_PRESENT and IS_VALID are only measured if |IS_VALID|
  28 // is true.
  29 enum ContentDispositionCountTypes {
  30   // Count of downloads which had a Content-Disposition headers. The total
  31   // number of downloads is measured by UNTHROTTLED_COUNT.
  32   CONTENT_DISPOSITION_HEADER_PRESENT = 0,
  33
  34   // At least one of 'name', 'filename' or 'filenae*' attributes were valid and
  35   // yielded a non-empty filename.
  36   CONTENT_DISPOSITION_IS_VALID,
  37
  38   // The following enum values correspond to
  39   // net::HttpContentDisposition::ParseResult.
  40   CONTENT_DISPOSITION_HAS_DISPOSITION_TYPE,
  41   CONTENT_DISPOSITION_HAS_UNKNOWN_TYPE,
  42   CONTENT_DISPOSITION_HAS_NAME,
  43   CONTENT_DISPOSITION_HAS_FILENAME,
  44   CONTENT_DISPOSITION_HAS_EXT_FILENAME,
  45   CONTENT_DISPOSITION_HAS_NON_ASCII_STRINGS,
  46   CONTENT_DISPOSITION_HAS_PERCENT_ENCODED_STRINGS,
  47   CONTENT_DISPOSITION_HAS_RFC2047_ENCODED_STRINGS,
  48
  49   // Only have the 'name' attribute is present.
  50   CONTENT_DISPOSITION_HAS_NAME_ONLY,
  51
  52   CONTENT_DISPOSITION_LAST_ENTRY
  53 };
  54
  55 void RecordContentDispositionCount(ContentDispositionCountTypes type,
  56                                    bool record) {
  57   if (!record)
  58     return;
  59   UMA_HISTOGRAM_ENUMERATION(
  60       "Download.ContentDisposition", type, CONTENT_DISPOSITION_LAST_ENTRY);
  61 }
  62
  63 void RecordContentDispositionCountFlag(
  64     ContentDispositionCountTypes type,
  65     int flags_to_test,
  66     net::HttpContentDisposition::ParseResultFlags flag) {
  67   RecordContentDispositionCount(type, (flags_to_test & flag) == flag);
  68 }
  69
  70 // Do not insert, delete, or reorder; this is being histogrammed. Append only.
  71 // All of the download_extensions.cc file types should be in this list.
  72 const base::FilePath::CharType* kDangerousFileTypes[] = {
  73   FILE_PATH_LITERAL(".ad"),
  74   FILE_PATH_LITERAL(".ade"),
  75   FILE_PATH_LITERAL(".adp"),
  76   FILE_PATH_LITERAL(".ah"),
  77   FILE_PATH_LITERAL(".apk"),
  78   FILE_PATH_LITERAL(".app"),
  79   FILE_PATH_LITERAL(".application"),
  80   FILE_PATH_LITERAL(".asp"),
  81   FILE_PATH_LITERAL(".asx"),
  82   FILE_PATH_LITERAL(".bas"),
  83   FILE_PATH_LITERAL(".bash"),
  84   FILE_PATH_LITERAL(".bat"),
  85   FILE_PATH_LITERAL(".cfg"),
  86   FILE_PATH_LITERAL(".chi"),
  87   FILE_PATH_LITERAL(".chm"),
  88   FILE_PATH_LITERAL(".class"),
  89   FILE_PATH_LITERAL(".cmd"),
  90   FILE_PATH_LITERAL(".com"),
  91   FILE_PATH_LITERAL(".command"),
  92   FILE_PATH_LITERAL(".crt"),
  93   FILE_PATH_LITERAL(".crx"),
  94   FILE_PATH_LITERAL(".csh"),
  95   FILE_PATH_LITERAL(".deb"),
  96   FILE_PATH_LITERAL(".dex"),
  97   FILE_PATH_LITERAL(".dll"),
  98   FILE_PATH_LITERAL(".drv"),
  99   FILE_PATH_LITERAL(".exe"),
 100   FILE_PATH_LITERAL(".fxp"),
 101   FILE_PATH_LITERAL(".grp"),
 102   FILE_PATH_LITERAL(".hlp"),
 103   FILE_PATH_LITERAL(".hta"),
 104   FILE_PATH_LITERAL(".htm"),
 105   FILE_PATH_LITERAL(".html"),
 106   FILE_PATH_LITERAL(".htt"),
 107   FILE_PATH_LITERAL(".inf"),
 108   FILE_PATH_LITERAL(".ini"),
 109   FILE_PATH_LITERAL(".ins"),
 110   FILE_PATH_LITERAL(".isp"),
 111   FILE_PATH_LITERAL(".jar"),
 112   FILE_PATH_LITERAL(".jnlp"),
 113   FILE_PATH_LITERAL(".user.js"),
 114   FILE_PATH_LITERAL(".js"),
 115   FILE_PATH_LITERAL(".jse"),
 116   FILE_PATH_LITERAL(".ksh"),
 117   FILE_PATH_LITERAL(".lnk"),
 118   FILE_PATH_LITERAL(".local"),
 119   FILE_PATH_LITERAL(".mad"),
 120   FILE_PATH_LITERAL(".maf"),
 121   FILE_PATH_LITERAL(".mag"),
 122   FILE_PATH_LITERAL(".mam"),
 123   FILE_PATH_LITERAL(".manifest"),
 124   FILE_PATH_LITERAL(".maq"),
 125   FILE_PATH_LITERAL(".mar"),
 126   FILE_PATH_LITERAL(".mas"),
 127   FILE_PATH_LITERAL(".mat"),
 128   FILE_PATH_LITERAL(".mau"),
 129   FILE_PATH_LITERAL(".mav"),
 130   FILE_PATH_LITERAL(".maw"),
 131   FILE_PATH_LITERAL(".mda"),
 132   FILE_PATH_LITERAL(".mdb"),
 133   FILE_PATH_LITERAL(".mde"),
 134   FILE_PATH_LITERAL(".mdt"),
 135   FILE_PATH_LITERAL(".mdw"),
 136   FILE_PATH_LITERAL(".mdz"),
 137   FILE_PATH_LITERAL(".mht"),
 138   FILE_PATH_LITERAL(".mhtml"),
 139   FILE_PATH_LITERAL(".mmc"),
 140   FILE_PATH_LITERAL(".mof"),
 141   FILE_PATH_LITERAL(".msc"),
 142   FILE_PATH_LITERAL(".msh"),
 143   FILE_PATH_LITERAL(".mshxml"),
 144   FILE_PATH_LITERAL(".msi"),
 145   FILE_PATH_LITERAL(".msp"),
 146   FILE_PATH_LITERAL(".mst"),
 147   FILE_PATH_LITERAL(".ocx"),
 148   FILE_PATH_LITERAL(".ops"),
 149   FILE_PATH_LITERAL(".pcd"),
 150   FILE_PATH_LITERAL(".pif"),
 151   FILE_PATH_LITERAL(".pkg"),
 152   FILE_PATH_LITERAL(".pl"),
 153   FILE_PATH_LITERAL(".plg"),
 154   FILE_PATH_LITERAL(".prf"),
 155   FILE_PATH_LITERAL(".prg"),
 156   FILE_PATH_LITERAL(".pst"),
 157   FILE_PATH_LITERAL(".py"),
 158   FILE_PATH_LITERAL(".pyc"),
 159   FILE_PATH_LITERAL(".pyw"),
 160   FILE_PATH_LITERAL(".rb"),
 161   FILE_PATH_LITERAL(".reg"),
 162   FILE_PATH_LITERAL(".rpm"),
 163   FILE_PATH_LITERAL(".scf"),
 164   FILE_PATH_LITERAL(".scr"),
 165   FILE_PATH_LITERAL(".sct"),
 166   FILE_PATH_LITERAL(".sh"),
 167   FILE_PATH_LITERAL(".shar"),
 168   FILE_PATH_LITERAL(".shb"),
 169   FILE_PATH_LITERAL(".shs"),
 170   FILE_PATH_LITERAL(".shtm"),
 171   FILE_PATH_LITERAL(".shtml"),
 172   FILE_PATH_LITERAL(".spl"),
 173   FILE_PATH_LITERAL(".svg"),
 174   FILE_PATH_LITERAL(".swf"),
 175   FILE_PATH_LITERAL(".sys"),
 176   FILE_PATH_LITERAL(".tcsh"),
 177   FILE_PATH_LITERAL(".url"),
 178   FILE_PATH_LITERAL(".vb"),
 179   FILE_PATH_LITERAL(".vbe"),
 180   FILE_PATH_LITERAL(".vbs"),
 181   FILE_PATH_LITERAL(".vsd"),
 182   FILE_PATH_LITERAL(".vsmacros"),
 183   FILE_PATH_LITERAL(".vss"),
 184   FILE_PATH_LITERAL(".vst"),
 185   FILE_PATH_LITERAL(".vsw"),
 186   FILE_PATH_LITERAL(".ws"),
 187   FILE_PATH_LITERAL(".wsc"),
 188   FILE_PATH_LITERAL(".wsf"),
 189   FILE_PATH_LITERAL(".wsh"),
 190   FILE_PATH_LITERAL(".xbap"),
 191   FILE_PATH_LITERAL(".xht"),
 192   FILE_PATH_LITERAL(".xhtm"),
 193   FILE_PATH_LITERAL(".xhtml"),
 194   FILE_PATH_LITERAL(".xml"),
 195   FILE_PATH_LITERAL(".xsl"),
 196   FILE_PATH_LITERAL(".xslt")
 197 };
 198
 199 // Maps extensions to their matching UMA histogram int value.
 200 int GetDangerousFileType(const base::FilePath& file_path) {
 201   for (size_t i = 0; i < arraysize(kDangerousFileTypes); ++i) {
 202     if (file_path.MatchesExtension(kDangerousFileTypes[i]))
 203       return i + 1;
 204   }
 205   return 0;  // Unknown extension.
 206 }
 207
 208 } // namespace
 209
 210 void RecordDownloadCount(DownloadCountTypes type) {
 211   UMA_HISTOGRAM_ENUMERATION(
 212       "Download.Counts", type, DOWNLOAD_COUNT_TYPES_LAST_ENTRY);
 213 }
 214
 215 void RecordDownloadSource(DownloadSource source) {
 216   UMA_HISTOGRAM_ENUMERATION(
 217       "Download.Sources", source, DOWNLOAD_SOURCE_LAST_ENTRY);
 218 }
 219
 220 void RecordDownloadCompleted(const base::TimeTicks& start, int64 download_len) {
 221   RecordDownloadCount(COMPLETED_COUNT);
 222   UMA_HISTOGRAM_LONG_TIMES("Download.Time", (base::TimeTicks::Now() - start));
 223   int64 max = 1024 * 1024 * 1024;  // One Terabyte.
 224   download_len /= 1024;  // In Kilobytes
 225   UMA_HISTOGRAM_CUSTOM_COUNTS("Download.DownloadSize",
 226                               download_len,
 227                               1,
 228                               max,
 229                               256);
 230 }
 231
 232 void RecordDownloadInterrupted(DownloadInterruptReason reason,
 233                                int64 received,
 234                                int64 total) {
 235   RecordDownloadCount(INTERRUPTED_COUNT);
 236   UMA_HISTOGRAM_CUSTOM_ENUMERATION(
 237       "Download.InterruptedReason",
 238       reason,
 239       base::CustomHistogram::ArrayToCustomRanges(
 240           kAllInterruptReasonCodes, arraysize(kAllInterruptReasonCodes)));
 241
 242   // The maximum should be 2^kBuckets, to have the logarithmic bucket
 243   // boundaries fall on powers of 2.
 244   static const int kBuckets = 30;
 245   static const int64 kMaxKb = 1 << kBuckets;  // One Terabyte, in Kilobytes.
 246   int64 delta_bytes = total - received;
 247   bool unknown_size = total <= 0;
 248   int64 received_kb = received / 1024;
 249   int64 total_kb = total / 1024;
 250   UMA_HISTOGRAM_CUSTOM_COUNTS("Download.InterruptedReceivedSizeK",
 251                               received_kb,
 252                               1,
 253                               kMaxKb,
 254                               kBuckets);
 255   if (!unknown_size) {
 256     UMA_HISTOGRAM_CUSTOM_COUNTS("Download.InterruptedTotalSizeK",
 257                                 total_kb,
 258                                 1,
 259                                 kMaxKb,
 260                                 kBuckets);
 261     if (delta_bytes == 0) {
 262       RecordDownloadCount(INTERRUPTED_AT_END_COUNT);
 263       UMA_HISTOGRAM_CUSTOM_ENUMERATION(
 264           "Download.InterruptedAtEndReason",
 265           reason,
 266           base::CustomHistogram::ArrayToCustomRanges(
 267               kAllInterruptReasonCodes,
 268               arraysize(kAllInterruptReasonCodes)));
 269     } else if (delta_bytes > 0) {
 270       UMA_HISTOGRAM_CUSTOM_COUNTS("Download.InterruptedOverrunBytes",
 271                                   delta_bytes,
 272                                   1,
 273                                   kMaxKb,
 274                                   kBuckets);
 275     } else {
 276       UMA_HISTOGRAM_CUSTOM_COUNTS("Download.InterruptedUnderrunBytes",
 277                                   -delta_bytes,
 278                                   1,
 279                                   kMaxKb,
 280                                   kBuckets);
 281     }
 282   }
 283
 284   UMA_HISTOGRAM_BOOLEAN("Download.InterruptedUnknownSize", unknown_size);
 285 }
 286
 287 void RecordMaliciousDownloadClassified(DownloadDangerType danger_type) {
 288   UMA_HISTOGRAM_ENUMERATION("Download.MaliciousDownloadClassified",
 289                             danger_type,
 290                             DOWNLOAD_DANGER_TYPE_MAX);
 291 }
 292
 293 void RecordDangerousDownloadAccept(DownloadDangerType danger_type,
 294                                    const base::FilePath& file_path) {
 295   UMA_HISTOGRAM_ENUMERATION("Download.DangerousDownloadValidated",
 296                             danger_type,
 297                             DOWNLOAD_DANGER_TYPE_MAX);
 298   if (danger_type == DOWNLOAD_DANGER_TYPE_DANGEROUS_FILE) {
 299     UMA_HISTOGRAM_SPARSE_SLOWLY(
 300         "Download.DangerousFile.DangerousDownloadValidated",
 301         GetDangerousFileType(file_path));
 302   }
 303 }
 304
 305 void RecordDangerousDownloadDiscard(DownloadDiscardReason reason,
 306                                     DownloadDangerType danger_type,
 307                                     const base::FilePath& file_path) {
 308   switch (reason) {
 309     case DOWNLOAD_DISCARD_DUE_TO_USER_ACTION:
 310       UMA_HISTOGRAM_ENUMERATION(
 311           "Download.UserDiscard", danger_type, DOWNLOAD_DANGER_TYPE_MAX);
 312       if (danger_type == DOWNLOAD_DANGER_TYPE_DANGEROUS_FILE) {
 313         UMA_HISTOGRAM_SPARSE_SLOWLY("Download.DangerousFile.UserDiscard",
 314                                     GetDangerousFileType(file_path));
 315       }
 316       break;
 317     case DOWNLOAD_DISCARD_DUE_TO_SHUTDOWN:
 318       UMA_HISTOGRAM_ENUMERATION(
 319           "Download.Discard", danger_type, DOWNLOAD_DANGER_TYPE_MAX);
 320       if (danger_type == DOWNLOAD_DANGER_TYPE_DANGEROUS_FILE) {
 321         UMA_HISTOGRAM_SPARSE_SLOWLY("Download.DangerousFile.Discard",
 322                                     GetDangerousFileType(file_path));
 323       }
 324       break;
 325     default:
 326       NOTREACHED();
 327   }
 328 }
 329
 330 void RecordDownloadWriteSize(size_t data_len) {
 331   int max = 1024 * 1024;  // One Megabyte.
 332   UMA_HISTOGRAM_CUSTOM_COUNTS("Download.WriteSize", data_len, 1, max, 256);
 333 }
 334
 335 void RecordDownloadWriteLoopCount(int count) {
 336   UMA_HISTOGRAM_ENUMERATION("Download.WriteLoopCount", count, 20);
 337 }
 338
 339 void RecordAcceptsRanges(const std::string& accepts_ranges,
 340                          int64 download_len,
 341                          bool has_strong_validator) {
 342   int64 max = 1024 * 1024 * 1024;  // One Terabyte.
 343   download_len /= 1024;  // In Kilobytes
 344   static const int kBuckets = 50;
 345
 346   if (LowerCaseEqualsASCII(accepts_ranges, "none")) {
 347     UMA_HISTOGRAM_CUSTOM_COUNTS("Download.AcceptRangesNone.KBytes",
 348                                 download_len,
 349                                 1,
 350                                 max,
 351                                 kBuckets);
 352   } else if (LowerCaseEqualsASCII(accepts_ranges, "bytes")) {
 353     UMA_HISTOGRAM_CUSTOM_COUNTS("Download.AcceptRangesBytes.KBytes",
 354                                 download_len,
 355                                 1,
 356                                 max,
 357                                 kBuckets);
 358     if (has_strong_validator)
 359       RecordDownloadCount(STRONG_VALIDATOR_AND_ACCEPTS_RANGES);
 360   } else {
 361     UMA_HISTOGRAM_CUSTOM_COUNTS("Download.AcceptRangesMissingOrInvalid.KBytes",
 362                                 download_len,
 363                                 1,
 364                                 max,
 365                                 kBuckets);
 366   }
 367 }
 368
 369 namespace {
 370
 371 enum DownloadContent {
 372   DOWNLOAD_CONTENT_UNRECOGNIZED = 0,
 373   DOWNLOAD_CONTENT_TEXT = 1,
 374   DOWNLOAD_CONTENT_IMAGE = 2,
 375   DOWNLOAD_CONTENT_AUDIO = 3,
 376   DOWNLOAD_CONTENT_VIDEO = 4,
 377   DOWNLOAD_CONTENT_OCTET_STREAM = 5,
 378   DOWNLOAD_CONTENT_PDF = 6,
 379   DOWNLOAD_CONTENT_DOC = 7,
 380   DOWNLOAD_CONTENT_XLS = 8,
 381   DOWNLOAD_CONTENT_PPT = 9,
 382   DOWNLOAD_CONTENT_ARCHIVE = 10,
 383   DOWNLOAD_CONTENT_EXE = 11,
 384   DOWNLOAD_CONTENT_DMG = 12,
 385   DOWNLOAD_CONTENT_CRX = 13,
 386   DOWNLOAD_CONTENT_MAX = 14,
 387 };
 388
 389 struct MimeTypeToDownloadContent {
 390   const char* mime_type;
 391   DownloadContent download_content;
 392 };
 393
 394 static MimeTypeToDownloadContent kMapMimeTypeToDownloadContent[] = {
 395   {"application/octet-stream", DOWNLOAD_CONTENT_OCTET_STREAM},
 396   {"binary/octet-stream", DOWNLOAD_CONTENT_OCTET_STREAM},
 397   {"application/pdf", DOWNLOAD_CONTENT_PDF},
 398   {"application/msword", DOWNLOAD_CONTENT_DOC},
 399   {"application/vnd.ms-excel", DOWNLOAD_CONTENT_XLS},
 400   {"application/vns.ms-powerpoint", DOWNLOAD_CONTENT_PPT},
 401   {"application/zip", DOWNLOAD_CONTENT_ARCHIVE},
 402   {"application/x-gzip", DOWNLOAD_CONTENT_ARCHIVE},
 403   {"application/x-rar-compressed", DOWNLOAD_CONTENT_ARCHIVE},
 404   {"application/x-tar", DOWNLOAD_CONTENT_ARCHIVE},
 405   {"application/x-bzip", DOWNLOAD_CONTENT_ARCHIVE},
 406   {"application/x-exe", DOWNLOAD_CONTENT_EXE},
 407   {"application/x-apple-diskimage", DOWNLOAD_CONTENT_DMG},
 408   {"application/x-chrome-extension", DOWNLOAD_CONTENT_CRX},
 409 };
 410
 411 enum DownloadImage {
 412   DOWNLOAD_IMAGE_UNRECOGNIZED = 0,
 413   DOWNLOAD_IMAGE_GIF = 1,
 414   DOWNLOAD_IMAGE_JPEG = 2,
 415   DOWNLOAD_IMAGE_PNG = 3,
 416   DOWNLOAD_IMAGE_TIFF = 4,
 417   DOWNLOAD_IMAGE_ICON = 5,
 418   DOWNLOAD_IMAGE_WEBP = 6,
 419   DOWNLOAD_IMAGE_MAX = 7,
 420 };
 421
 422 struct MimeTypeToDownloadImage {
 423   const char* mime_type;
 424   DownloadImage download_image;
 425 };
 426
 427 static MimeTypeToDownloadImage kMapMimeTypeToDownloadImage[] = {
 428   {"image/gif", DOWNLOAD_IMAGE_GIF},
 429   {"image/jpeg", DOWNLOAD_IMAGE_JPEG},
 430   {"image/png", DOWNLOAD_IMAGE_PNG},
 431   {"image/tiff", DOWNLOAD_IMAGE_TIFF},
 432   {"image/vnd.microsoft.icon", DOWNLOAD_IMAGE_ICON},
 433   {"image/webp", DOWNLOAD_IMAGE_WEBP},
 434 };
 435
 436 void RecordDownloadImageType(const std::string& mime_type_string) {
 437   DownloadImage download_image = DOWNLOAD_IMAGE_UNRECOGNIZED;
 438
 439   // Look up exact matches.
 440   for (size_t i = 0; i < arraysize(kMapMimeTypeToDownloadImage); ++i) {
 441     const MimeTypeToDownloadImage& entry = kMapMimeTypeToDownloadImage[i];
 442     if (mime_type_string == entry.mime_type) {
 443       download_image = entry.download_image;
 444       break;
 445     }
 446   }
 447
 448   UMA_HISTOGRAM_ENUMERATION("Download.ContentImageType",
 449                             download_image,
 450                             DOWNLOAD_IMAGE_MAX);
 451 }
 452
 453 }  // namespace
 454
 455 void RecordDownloadMimeType(const std::string& mime_type_string) {
 456   DownloadContent download_content = DOWNLOAD_CONTENT_UNRECOGNIZED;
 457
 458   // Look up exact matches.
 459   for (size_t i = 0; i < arraysize(kMapMimeTypeToDownloadContent); ++i) {
 460     const MimeTypeToDownloadContent& entry = kMapMimeTypeToDownloadContent[i];
 461     if (mime_type_string == entry.mime_type) {
 462       download_content = entry.download_content;
 463       break;
 464     }
 465   }
 466
 467   // Do partial matches.
 468   if (download_content == DOWNLOAD_CONTENT_UNRECOGNIZED) {
 469     if (StartsWithASCII(mime_type_string, "text/", true)) {
 470       download_content = DOWNLOAD_CONTENT_TEXT;
 471     } else if (StartsWithASCII(mime_type_string, "image/", true)) {
 472       download_content = DOWNLOAD_CONTENT_IMAGE;
 473       RecordDownloadImageType(mime_type_string);
 474     } else if (StartsWithASCII(mime_type_string, "audio/", true)) {
 475       download_content = DOWNLOAD_CONTENT_AUDIO;
 476     } else if (StartsWithASCII(mime_type_string, "video/", true)) {
 477       download_content = DOWNLOAD_CONTENT_VIDEO;
 478     }
 479   }
 480
 481   // Record the value.
 482   UMA_HISTOGRAM_ENUMERATION("Download.ContentType",
 483                             download_content,
 484                             DOWNLOAD_CONTENT_MAX);
 485 }
 486
 487 void RecordDownloadContentDisposition(
 488     const std::string& content_disposition_string) {
 489   if (content_disposition_string.empty())
 490     return;
 491   net::HttpContentDisposition content_disposition(content_disposition_string,
 492                                                   std::string());
 493   int result = content_disposition.parse_result_flags();
 494
 495   bool is_valid = !content_disposition.filename().empty();
 496   RecordContentDispositionCount(CONTENT_DISPOSITION_HEADER_PRESENT, true);
 497   RecordContentDispositionCount(CONTENT_DISPOSITION_IS_VALID, is_valid);
 498   if (!is_valid)
 499     return;
 500
 501   RecordContentDispositionCountFlag(
 502       CONTENT_DISPOSITION_HAS_DISPOSITION_TYPE, result,
 503       net::HttpContentDisposition::HAS_DISPOSITION_TYPE);
 504   RecordContentDispositionCountFlag(
 505       CONTENT_DISPOSITION_HAS_UNKNOWN_TYPE, result,
 506       net::HttpContentDisposition::HAS_UNKNOWN_DISPOSITION_TYPE);
 507   RecordContentDispositionCountFlag(
 508       CONTENT_DISPOSITION_HAS_NAME, result,
 509       net::HttpContentDisposition::HAS_NAME);
 510   RecordContentDispositionCountFlag(
 511       CONTENT_DISPOSITION_HAS_FILENAME, result,
 512       net::HttpContentDisposition::HAS_FILENAME);
 513   RecordContentDispositionCountFlag(
 514       CONTENT_DISPOSITION_HAS_EXT_FILENAME, result,
 515       net::HttpContentDisposition::HAS_EXT_FILENAME);
 516   RecordContentDispositionCountFlag(
 517       CONTENT_DISPOSITION_HAS_NON_ASCII_STRINGS, result,
 518       net::HttpContentDisposition::HAS_NON_ASCII_STRINGS);
 519   RecordContentDispositionCountFlag(
 520       CONTENT_DISPOSITION_HAS_PERCENT_ENCODED_STRINGS, result,
 521       net::HttpContentDisposition::HAS_PERCENT_ENCODED_STRINGS);
 522   RecordContentDispositionCountFlag(
 523       CONTENT_DISPOSITION_HAS_RFC2047_ENCODED_STRINGS, result,
 524       net::HttpContentDisposition::HAS_RFC2047_ENCODED_STRINGS);
 525
 526   RecordContentDispositionCount(
 527       CONTENT_DISPOSITION_HAS_NAME_ONLY,
 528       (result & (net::HttpContentDisposition::HAS_NAME |
 529                  net::HttpContentDisposition::HAS_FILENAME |
 530                  net::HttpContentDisposition::HAS_EXT_FILENAME)) ==
 531       net::HttpContentDisposition::HAS_NAME);
 532 }
 533
 534 void RecordFileThreadReceiveBuffers(size_t num_buffers) {
 535     UMA_HISTOGRAM_CUSTOM_COUNTS(
 536       "Download.FileThreadReceiveBuffers", num_buffers, 1,
 537       100, 100);
 538 }
 539
 540 void RecordBandwidth(double actual_bandwidth, double potential_bandwidth) {
 541   UMA_HISTOGRAM_CUSTOM_COUNTS(
 542       "Download.ActualBandwidth", actual_bandwidth, 1, 1000000000, 50);
 543   UMA_HISTOGRAM_CUSTOM_COUNTS(
 544       "Download.PotentialBandwidth", potential_bandwidth, 1, 1000000000, 50);
 545   UMA_HISTOGRAM_PERCENTAGE(
 546       "Download.BandwidthUsed",
 547       (int) ((actual_bandwidth * 100)/ potential_bandwidth));
 548 }
 549
 550 void RecordOpen(const base::Time& end, bool first) {
 551   if (!end.is_null()) {
 552     UMA_HISTOGRAM_LONG_TIMES("Download.OpenTime", (base::Time::Now() - end));
 553     if (first) {
 554       UMA_HISTOGRAM_LONG_TIMES("Download.FirstOpenTime",
 555                               (base::Time::Now() - end));
 556     }
 557   }
 558 }
 559
 560 void RecordClearAllSize(int size) {
 561   UMA_HISTOGRAM_CUSTOM_COUNTS("Download.ClearAllSize",
 562                               size,
 563                               0/*min*/,
 564                               (1 << 10)/*max*/,
 565                               32/*num_buckets*/);
 566 }
 567
 568 void RecordOpensOutstanding(int size) {
 569   UMA_HISTOGRAM_CUSTOM_COUNTS("Download.OpensOutstanding",
 570                               size,
 571                               0/*min*/,
 572                               (1 << 10)/*max*/,
 573                               64/*num_buckets*/);
 574 }
 575
 576 void RecordContiguousWriteTime(base::TimeDelta time_blocked) {
 577   UMA_HISTOGRAM_TIMES("Download.FileThreadBlockedTime", time_blocked);
 578 }
 579
 580 // Record what percentage of the time we have the network flow controlled.
 581 void RecordNetworkBlockage(base::TimeDelta resource_handler_lifetime,
 582                            base::TimeDelta resource_handler_blocked_time) {
 583   int percentage = 0;
 584   // Avoid division by zero errors.
 585   if (resource_handler_blocked_time != base::TimeDelta()) {
 586     percentage =
 587         resource_handler_blocked_time * 100 / resource_handler_lifetime;
 588   }
 589
 590   UMA_HISTOGRAM_COUNTS_100("Download.ResourceHandlerBlockedPercentage",
 591                            percentage);
 592 }
 593
 594 void RecordFileBandwidth(size_t length,
 595                          base::TimeDelta disk_write_time,
 596                          base::TimeDelta elapsed_time) {
 597   size_t elapsed_time_ms = elapsed_time.InMilliseconds();
 598   if (0u == elapsed_time_ms)
 599     elapsed_time_ms = 1;
 600   size_t disk_write_time_ms = disk_write_time.InMilliseconds();
 601   if (0u == disk_write_time_ms)
 602     disk_write_time_ms = 1;
 603
 604   UMA_HISTOGRAM_CUSTOM_COUNTS(
 605       "Download.BandwidthOverallBytesPerSecond",
 606       (1000 * length / elapsed_time_ms), 1, 50000000, 50);
 607   UMA_HISTOGRAM_CUSTOM_COUNTS(
 608       "Download.BandwidthDiskBytesPerSecond",
 609       (1000 * length / disk_write_time_ms), 1, 50000000, 50);
 610   UMA_HISTOGRAM_COUNTS_100("Download.DiskBandwidthUsedPercentage",
 611                            disk_write_time_ms * 100 / elapsed_time_ms);
 612 }
 613
 614 void RecordDownloadFileRenameResultAfterRetry(
 615     base::TimeDelta time_since_first_failure,
 616     DownloadInterruptReason interrupt_reason) {
 617   if (interrupt_reason == DOWNLOAD_INTERRUPT_REASON_NONE) {
 618     UMA_HISTOGRAM_TIMES("Download.TimeToRenameSuccessAfterInitialFailure",
 619                         time_since_first_failure);
 620   } else {
 621     UMA_HISTOGRAM_TIMES("Download.TimeToRenameFailureAfterInitialFailure",
 622                         time_since_first_failure);
 623   }
 624 }
 625
 626 void RecordSavePackageEvent(SavePackageEvent event) {
 627   UMA_HISTOGRAM_ENUMERATION("Download.SavePackage",
 628                             event,
 629                             SAVE_PACKAGE_LAST_ENTRY);
 630 }
 631
 632 void RecordOriginStateOnResumption(bool is_partial,
 633                                    int state) {
 634   if (is_partial)
 635     UMA_HISTOGRAM_ENUMERATION("Download.OriginStateOnPartialResumption", state,
 636                               ORIGIN_STATE_ON_RESUMPTION_MAX);
 637   else
 638     UMA_HISTOGRAM_ENUMERATION("Download.OriginStateOnFullResumption", state,
 639                               ORIGIN_STATE_ON_RESUMPTION_MAX);
 640 }
 641
 642 }  // namespace content