Introduce CertificateReportingService class to handle certificate reports.

chrome/browser/ssl/certificate_reporting_service.h

Index: chrome/browser/ssl/certificate_reporting_service.h
diff --git a/chrome/browser/ssl/certificate_reporting_service.h b/chrome/browser/ssl/certificate_reporting_service.h
new file mode 100644
index 0000000000000000000000000000000000000000..33e16dc055ff925ba3a85fdd90c9c91540c7522b
--- /dev/null
+++ b/chrome/browser/ssl/certificate_reporting_service.h
@@ -0,0 +1,110 @@
+// 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.
+
+#ifndef CHROME_BROWSER_SSL_CERTIFICATE_REPORTING_SERVICE_H_
+#define CHROME_BROWSER_SSL_CERTIFICATE_REPORTING_SERVICE_H_
+
+#include <map>
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "base/macros.h"
+#include "base/memory/weak_ptr.h"
+#include "base/threading/thread_checker.h"
+#include "base/time/time.h"
+#include "components/certificate_reporting/error_reporter.h"
+
+namespace base {
+class Clock;
+}
+
+// This service initiates uploads of invalid certificate reports and retries any
+// failed uploads.
+class CertificateReportingService {
+ public:
+  // Represent a report to be sent.
+  struct Report {
+    int report_id;
+    base::Time creation_time;
+    std::string serialized_report;
+    Report(int report_id,
+           base::Time creation_time,
+           const std::string& serialized_report)
+        : report_id(report_id),
+          creation_time(creation_time),
+          serialized_report(serialized_report) {}
+  };
+
+  // This class contains a number of reports, sorted by the first time the
+  // report was to be sent. Oldest reports are at the end of the list. The
+  // number of reports are bounded by |max_size|. The implementation sorts all
+  // items in the list whenever a new item is added. This should be fine for
+  // small values of |max_size| (e.g. fewer than 100 items). In case this is not
+  // sufficient in the future, an array based implementation should be
+  // considered where the array is maintained as a heap.
+  class BoundedReportList {
+   public:
+    explicit BoundedReportList(size_t max_size);
+    ~BoundedReportList();
+
+    void Add(const Report& report);
+    void Clear();
+
+    const std::vector<Report>& items() const;
+
+   private:
+    // Maximum number of reports in the list. If the number of reports in the
+    // list is smaller than this number, a new item is immediately added to the
+    // list. Otherwise, the item is compared to the items in the list and only
+    // added when it's newer than the oldest item in the list.
+    const size_t max_size_;
+
+    std::vector<Report> items_;
+    base::ThreadChecker thread_checker_;
+  };
+
+  // Class that handles report uploads and implements the upload retry logic.
+  class Reporter {
+   public:
+    Reporter(
+        std::unique_ptr<certificate_reporting::ErrorReporter> error_reporter_,
+        std::unique_ptr<BoundedReportList> retry_list,
+        base::Clock* clock,
+        base::TimeDelta max_item_age);
+    ~Reporter();
+
+    // Sends a report. If the send fails, the report will be added to the retry
+    // list.
+    void Send(const std::string& serialized_report);
+
+    // Sends all pending reports. Skips reports older than the |max_item_age|
+    // provided in the constructor. Failed reports will be added to the retry
+    // list.
+    void SendPending();
+
+    // Getter and setters for testing:
+    size_t inflight_report_count_for_testing() const;
+    BoundedReportList* GetQueueForTesting() const;
+
+   private:
+    void SendInternal(const Report& report);
+    void ErrorCallback(int report_id, const GURL& url, int error);
+    void SuccessCallback(int report_id);
+
+    std::unique_ptr<certificate_reporting::ErrorReporter> error_reporter_;
+    std::unique_ptr<BoundedReportList> retry_list_;
+    base::Clock* test_clock_;
+    const base::TimeDelta max_item_age_;
+    int current_report_id_;
+
+    std::map<int, Report> inflight_reports_;
+
+    base::WeakPtrFactory<Reporter> weak_factory_;
+
+    DISALLOW_IMPLICIT_CONSTRUCTORS(Reporter);
+  };
+};
+
+#endif  // CHROME_BROWSER_SSL_CERTIFICATE_REPORTING_SERVICE_H_