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- // Copyright 2019 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/http/webfonts_histogram.h"
- #include "base/strings/string_piece.h"
- #include "net/disk_cache/blockfile/histogram_macros.h"
- namespace {
- // Tests if the substring of str that begins at pos starts with substr. If so,
- // returns true and advances pos by the length of substr.
- bool Consume(const std::string& str,
- base::StringPiece substr,
- std::string::size_type* pos) {
- if (!str.compare(*pos, substr.length(), substr.data())) {
- *pos += substr.length();
- return true;
- }
- return false;
- }
- const char kRoboto[] = "roboto";
- const char kOpenSans[] = "opensans";
- const char kRobotoHistogramName[] = "WebFont.HttpCacheStatus_roboto";
- const char kOpenSansHistogramName[] = "WebFont.HttpCacheStatus_opensans";
- const char kOthersHistogramName[] = "WebFont.HttpCacheStatus_others";
- void RecordCacheEvent(net::HttpResponseInfo::CacheEntryStatus cache_status,
- const std::string& histogram_name) {
- CACHE_HISTOGRAM_ENUMERATION(
- histogram_name, cache_status,
- net::HttpResponseInfo::CacheEntryStatus::ENTRY_MAX);
- }
- } // namespace
- namespace net::web_fonts_histogram {
- // Check if |key| is a URL for a font resource of Google Fonts.
- // If so, record the WebFont.HttpCacheStatus histogram suffixed by "roboto",
- // "opensans" or "others".
- void MaybeRecordCacheStatus(HttpResponseInfo::CacheEntryStatus cache_status,
- const std::string& key) {
- std::string::size_type pos = 0;
- if (Consume(key, "https://", &pos) || Consume(key, "http://", &pos)) {
- if (Consume(key, "themes.googleusercontent.com/static/fonts/", &pos) ||
- Consume(key, "ssl.gstatic.com/fonts/", &pos) ||
- Consume(key, "fonts.gstatic.com/s/", &pos)) {
- if (Consume(key, kRoboto, &pos)) {
- RecordCacheEvent(cache_status, kRobotoHistogramName);
- } else if (Consume(key, kOpenSans, &pos)) {
- RecordCacheEvent(cache_status, kOpenSansHistogramName);
- } else {
- RecordCacheEvent(cache_status, kOthersHistogramName);
- }
- }
- }
- }
- } // namespace net::web_fonts_histogram
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