Introduce CertificateReportingService class to handle certificate reports.

chrome/browser/ssl/certificate_reporting_service.cc

+// Copyright 2016 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 "base/time/clock.h"
+#include "base/time/default_clock.h"
+#include "chrome/browser/ssl/certificate_reporting_service.h"
+#include "content/public/browser/browser_thread.h"
+
+namespace {
+// First item is ordered before the second item if it's newer.
+bool ReportCompareFunc(const CertificateReportingService::Report& item1,
+                       const CertificateReportingService::Report& item2) {
+  return item1.creation_time > item2.creation_time;
+}
+
+}  // namespace
+
+void CertificateReportingService::BoundedReportList::Add(const Report& item) {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  DCHECK(items_.size() <= max_size_);
+  if (items_.size() == max_size_) {
+    const Report& last = items_.back();
+    if (item.creation_time <= last.creation_time) {
+      // Report older than the oldest item in the queue, ignore.

[estark, 2016/11/19 00:29:52]

The comments in this function are helpful 👍

+      return;
+    }
+    // Reached the maximum item count, remove the oldest item.
+    items_.pop_back();
+  }
+  items_.push_back(item);
+  std::sort(items_.begin(), items_.end(), ReportCompareFunc);
+}
+
+CertificateReportingService::BoundedReportList::BoundedReportList(
+    size_t max_size)
+    : max_size_(max_size) {
+  DCHECK(thread_checker_.CalledOnValidThread());
+}
+
+void CertificateReportingService::BoundedReportList::Clear() {
+  items_.clear();
+}
+
+CertificateReportingService::BoundedReportList::~BoundedReportList() {}
+
+const std::vector<CertificateReportingService::Report>&
+CertificateReportingService::BoundedReportList::items() const {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  return items_;
+}
+
+CertificateReportingService::Reporter::Reporter(
+    std::unique_ptr<certificate_reporting::ErrorReporter> error_reporter,
+    std::unique_ptr<BoundedReportList> retry_list,
+    base::Clock* clock,
+    base::TimeDelta max_item_age)
+    : error_reporter_(std::move(error_reporter)),
+      retry_list_(std::move(retry_list)),
+      test_clock_(clock),
+      max_item_age_(max_item_age),
+      current_report_id_(0),
+      weak_factory_(this) {}
+
+void CertificateReportingService::Reporter::Send(
+    const std::string& serialized_report) {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
+  base::Time now =
+      test_clock_ ? test_clock_->Now() : base::Time::NowFromSystemTime();
+  SendInternal(Report(current_report_id_++, now, serialized_report));
+}
+
+void CertificateReportingService::Reporter::SendPending() {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
+  base::Time now =
+      test_clock_ ? test_clock_->Now() : base::Time::NowFromSystemTime();
+  // Copy pending reports and clear the retry list.
+  std::vector<Report> items = retry_list_->items();
+  retry_list_->Clear();
+  for (const Report& report : items) {
+    if (report.creation_time < now - max_item_age_) {
+      // Report too old, ignore.
+      continue;
+    }
+    SendInternal(report);
+  }
+  retry_list_->Clear();
+}
+
+size_t
+CertificateReportingService::Reporter::inflight_report_count_for_testing()
+    const {
+  return inflight_reports_.size();
+}
+
+CertificateReportingService::BoundedReportList*
+CertificateReportingService::Reporter::GetQueueForTesting() const {
+  return retry_list_.get();
+}
+
+CertificateReportingService::Reporter::~Reporter() {}
+
+void CertificateReportingService::Reporter::SendInternal(
+    const CertificateReportingService::Report& report) {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
+  inflight_reports_.insert(std::make_pair(report.report_id, report));
+  error_reporter_->SendExtendedReportingReport(
+      report.serialized_report,
+      base::Bind(&CertificateReportingService::Reporter::SuccessCallback,
+                 weak_factory_.GetWeakPtr(), report.report_id),
+      base::Bind(&CertificateReportingService::Reporter::ErrorCallback,
+                 weak_factory_.GetWeakPtr(), report.report_id));
+}
+
+void CertificateReportingService::Reporter::ErrorCallback(int report_id,
+                                                          const GURL& url,
+                                                          int error) {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
+  auto it = inflight_reports_.find(report_id);
+  DCHECK(it != inflight_reports_.end());
+  retry_list_->Add(it->second);
+  CHECK_GT(inflight_reports_.erase(report_id), 0u);
+}
+
+void CertificateReportingService::Reporter::SuccessCallback(int report_id) {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
+  CHECK_GT(inflight_reports_.erase(report_id), 0u);
+}