Record UMA statistics for file_stream operations.

net/base/file_stream.cc

Index: net/base/file_stream.cc
diff --git a/net/base/file_stream.cc b/net/base/file_stream.cc
new file mode 100644
index 0000000000000000000000000000000000000000..aae50c2d14ccb092f72b05fcbb4f8c61d776a44c
--- /dev/null
+++ b/net/base/file_stream.cc
@@ -0,0 +1,251 @@
+// Copyright (c) 2011 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 "net/base/file_stream.h"
+
+#include <string>
+#if defined(OS_WIN)
+#include <windows.h>
+#endif
+
+#include "base/basictypes.h"
+#include "base/logging.h"
+#include "base/metrics/histogram.h"
+
+namespace net {
+
+namespace {
+
+int g_recording_class_mask = RECORDING_CLASS_NONE;
+
+#if  defined(OS_WIN)
+
+struct Range {
+  int low;
+  int high;
+  bool record_individually;
+};
+
+// This must be higher than the largest value that isn't remapped into a bucket.
+int kErrorBucketStart = 400;
+
+Range kErrorRangeList[] = {
+  { 0, 321, true },  // These are the ones we don't remap into buckets.
+  { 335, 371, false },
+  { 383, 387, false },
+  { 399, 404, false },
+  { 415, 418, false },
+  { 431, 433, false },
+  { 447, 868, false },
+  { 994, 1471, false },
+  { 1500, 1513, false },
+  { 1536, 1553, false },
+  { 1601, 1654, false },
+  { 1700, 1834, false },
+  { 1898, 1938, false },
+  { 2000, 2024, false },
+  { 2048, 2085, false },
+  { 2108, 2110, false },
+  { 2202, 2203, false },
+  { 2250, 2251, false },
+  { 2401, 2405, false },
+  { 3000, 3021, false },
+  { 3950, 3951, false },
+  { 4000, 4007, false },
+  { 4050, 4066, false },
+  { 4096, 4116, false },
+  { 4200, 4215, false },
+  { 4300, 4353, false },
+  { 4390, 4395, false },
+  { 4500, 4501, false },
+  { 4864, 4905, false },
+  { 5001, 5090, false },
+  { 5890, 5953, false },
+  { 6000, 6023, false },
+  { 6118, 6119, false },
+  { 6200, 6201, false },
+  { 6600, 6649, false },
+  { 6700, 6732, false },
+  { 6800, 6856, false },
+  { 7001, 7071, false },
+  { 8001, 8018, false },
+  { 8192, 8263, false },
+  { 8301, 8640, false },
+  { 8704, 8705, false },
+  { 8960, 9053, false },
+  { 9216, 9218, false },
+  { 9263, 9276, false },
+  { 9472, 9506, false },
+  { 9550, 9573, false },
+  { 9600, 9622, false },
+  { 9650, 9656, false },
+  { 9688, 9723, false },
+  { 9750, 9754, false },
+  { 9800, 9802, false },
+  { 9850, 9853, false },
+  { 9900, 9907, false },
+  { 10000, 10072, false },
+  { 10091, 10113, false },
+  { 11001, 11034, false },
+  { 12288, 12335, false },
+  { 12544, 12559, false },
+  { 12595, 12597, false },
+  { 12801, 12803, false },
+  { 13000, 13026, false },
+  { 13800, 13933, false },
+  { 14000, 14111, false },
+  { 15000, 15039, false },
+  { 15080, 15086, false },
+  { 15100, 15109, false },
+  { 15200, 15208, false },
+  { 15250, 15251, false },
+  { 15299, 15302, false },
+  { 16385, 16436, false },
+  { 18432, 18454, false },
+  { 20480, 20486, false },
+  { 24577, 24607, false },
+  { 28673, 28698, false },
+  { 32790, 32816, false },
+  { 33281, 33322, false },
+  { 35005, 35024, false },
+  { 36000, 36004, false },
+  { 40010, 40011, false },
+  { 40067, 40069, false },
+  { 53248, 53293, false },
+  { 53376, 53382, false },
+  { 57344, 57360, false },
+  { 57377, 57394, false },
+  { 65535, 65536 }
+};
+size_t kNumErrorRanges = ARRAYSIZE_UNSAFE(kErrorRangeList);
+
+// Windows has very many errors.  We're not interested in most of them, but we
+// don't know which ones are significant.
+// This function maps error ranges we think we don't care about to specific
+// buckets, and leaves the others alone.  If we get hits on the buckets,
+// we can add those values to the values we leave alone.
+// If we get values *between* the buckets, we record those as buckets too.
+// The range list is extracted from WinError.h.
+int ReduceErrorRange(int error) {
+  error = HRESULT_CODE(error);
+
+  for (size_t n = 0; n < kNumErrorRanges; ++n) {
+    if (kErrorRangeList[n].record_individually) {
+      if (error < kErrorRangeList[n].low)
+        return kErrorBucketStart + (2 * n) - 1;  // In gap before the bucket.
+      if (error <= kErrorRangeList[n].high)
+        return error;  // Record individually.
+    } else {
+      if (error < kErrorRangeList[n].low)
+        return kErrorBucketStart + (2 * n) - 1;  // In gap before the bucket.
+      if (error <= kErrorRangeList[n].high)
+        return kErrorBucketStart + 2 * n;  // In bucket.
+    }
+  }
+
+  // After the last bucket.
+  return kErrorBucketStart + 2 * kNumErrorRanges;
+}
+
+#endif  // defined(OS_WIN)
+
+void RecordFileErrorTypeCount(FileErrorTypes type) {
+  UMA_HISTOGRAM_ENUMERATION(
+      "FileErrorType.Counts", type, FILE_ERROR_TYPES_COUNT);
+}
+
+std::string RecordUmaName(FileErrorTypes type, int class_flags) {
+  std::string s;
+  static const char* names[] = {
+    "FileErrorTypes.NotOpenError",
+    "FileErrorTypes.OpenError",
+    "FileErrorTypes.WriteError",
+    "FileErrorTypes.ReadError",
+    "FileErrorTypes.SeekError",
+    "FileErrorTypes.FlushError",
+    "FileErrorTypes.SetEofError",
+    "FileErrorTypes.GetSizeError",
+  };
+  static const char* classes[] = {
+    ".Download",
+    // Add more strings here as necessary to match |RecordingClass| items.
+  };
+  static const int num_classes = ARRAYSIZE_UNSAFE(classes);
+
+  s = names[type];
+
+  int i;
+  int mask;
+  int start = RECORDING_CLASS_NONE + 1;
+  for (i = start, mask = 1 << (start - 1);
+       i < (num_classes + start);
+       mask <<= 1, i++) {
+    if (class_flags & mask) {
+      s += classes[i - start];
+      break;
+    }
+  }
+
+  return s;
+}
+
+}  // namespace
+
+void EnableRecordingForClass(int class_flags) {
+  g_recording_class_mask = class_flags;
+}
+
+#define UMA_HISTOGRAM_CLASS(c) \
+  if (class_flags & (1 << RECORDING_CLASS_##c) & g_recording_class_mask) { \
+    UMA_HISTOGRAM_ENUMERATION(name.c_str(), error, max_error); \
+    break; \
+  }
+
+#define UMA_HISTOGRAM_CLASSES() \
+  for (int i = 0; i < RECORDING_CLASS_MAX; ++i) { \
+    UMA_HISTOGRAM_CLASS(DOWNLOADS) \
+  }
+
+#define UMA_HISTOGRAM_TYPE(t) \
+  case FILE_ERROR_TYPES_##t: \
+    UMA_HISTOGRAM_CLASSES() \
+    break;
+
+void RecordFileError(int error, FileErrorTypes type, int class_flags) {
+  if (class_flags == RECORDING_CLASS_NONE)
+    return;
+
+  RecordFileErrorTypeCount(type);
+
+  std::string name = RecordUmaName(type, class_flags);
+
+  DLOG(WARNING) << "() " << "Recording error " << error
+                << " of type " << type << " with flags " << class_flags
+                << ". Name = '" << name << "'";
+
+  unsigned int max_error = (1U << 14) - 2;  // Histogram limit.
+
+#if  defined(OS_WIN)
+  error = ReduceErrorRange(error);
+  max_error = kErrorBucketStart + 2 * kNumErrorRanges + 1;
+#elif  defined(OS_POSIX)
+  // Posix errors seem to have only low positive values.
+  max_error = 160;
+#endif
+
+  switch(type) {
+    UMA_HISTOGRAM_TYPE(IS_NOT_OPEN)
+    UMA_HISTOGRAM_TYPE(OPEN)
+    UMA_HISTOGRAM_TYPE(WRITE)
+    UMA_HISTOGRAM_TYPE(READ)
+    UMA_HISTOGRAM_TYPE(SEEK)
+    UMA_HISTOGRAM_TYPE(FLUSH)
+    UMA_HISTOGRAM_TYPE(SET_EOF)
+    UMA_HISTOGRAM_TYPE(GET_SIZE)
+    default:
+      break;
+  }
+}
+
+}  // namespace net