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106 lines
3.3 KiB
C++
106 lines
3.3 KiB
C++
// Copyright 2014 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "net/disk_cache/blockfile/webfonts_histogram.h"
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#include "base/strings/string_piece.h"
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#include "base/strings/stringprintf.h"
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#include "net/disk_cache/blockfile/entry_impl.h"
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#include "net/disk_cache/blockfile/histogram_macros.h"
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namespace {
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enum WebFontDiskCacheEventType {
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CACHE_EVENT_MISS,
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CACHE_EVENT_HIT,
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CACHE_EVENT_EVICTED_ENTRY,
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CACHE_EVENT_MAX
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};
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// Tests if the substring of str that begins at pos starts with substr. If so,
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// returns true and advances pos by the length of substr.
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bool Consume(const std::string& str, const base::StringPiece& substr,
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std::string::size_type* pos) {
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if (!str.compare(*pos, substr.length(), substr.data())) {
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*pos += substr.length();
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return true;
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}
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return false;
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}
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const char kRoboto[] = "roboto";
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const char kOpenSans[] = "opensans";
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const char kOthers[] = "others";
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// Check if the given string is a URL for a font resource of Google Fonts.
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// If so, returns a label for UMA histogram ("roboto", "opensans" or "others").
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const char* HistogramLabel(const std::string& str) {
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std::string::size_type pos = 0;
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if (Consume(str, "http://", &pos) || Consume(str, "https://", &pos)) {
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if (Consume(str, "themes.googleusercontent.com/static/fonts/", &pos) ||
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Consume(str, "ssl.gstatic.com/fonts/", &pos) ||
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Consume(str, "fonts.gstatic.com/s/", &pos)) {
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if (Consume(str, kRoboto, &pos))
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return kRoboto;
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if (Consume(str, kOpenSans, &pos))
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return kOpenSans;
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return kOthers;
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}
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}
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return NULL;
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}
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std::string HistogramName(const char* prefix, const char* label) {
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return base::StringPrintf("WebFont.%s_%s", prefix, label);
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}
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void RecordCacheEvent(WebFontDiskCacheEventType type, const char* label) {
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CACHE_HISTOGRAM_ENUMERATION(HistogramName("DiskCacheHit", label),
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type, CACHE_EVENT_MAX);
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}
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} // namespace
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namespace disk_cache {
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namespace web_fonts_histogram {
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void RecordCacheMiss(const std::string& key) {
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const char* label = HistogramLabel(key);
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if (label)
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RecordCacheEvent(CACHE_EVENT_MISS, label);
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}
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void RecordEvictedEntry(const std::string& key) {
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const char* label = HistogramLabel(key);
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if (label)
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RecordCacheEvent(CACHE_EVENT_EVICTED_ENTRY, label);
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}
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void RecordCacheHit(EntryImpl* entry) {
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const char* label = HistogramLabel(entry->GetKey());
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if (!label)
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return;
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EntryStore* info = entry->entry()->Data();
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CACHE_HISTOGRAM_COUNTS_10000(HistogramName("DiskCache.ReuseCount.Hit", label),
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info->reuse_count);
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CACHE_HISTOGRAM_AGE(HistogramName("DiskCache.EntryAge.Hit", label),
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base::Time::FromInternalValue(info->creation_time));
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RecordCacheEvent(CACHE_EVENT_HIT, label);
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}
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void RecordEviction(EntryImpl* entry) {
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const char* label = HistogramLabel(entry->GetKey());
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if (!label)
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return;
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EntryStore* info = entry->entry()->Data();
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CACHE_HISTOGRAM_COUNTS_10000(
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HistogramName("DiskCache.ReuseCount.Evict", label),
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info->reuse_count);
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CACHE_HISTOGRAM_AGE(HistogramName("DiskCache.EntryAge.Evict", label),
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base::Time::FromInternalValue(info->creation_time));
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}
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} // namespace web_fonts_histogram
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} // namespace disk_cache
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