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third_party/crashpad/crashpad/handler/crash_report_upload_thread.h

Index: third_party/crashpad/crashpad/handler/crash_report_upload_thread.h
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+// Copyright 2015 The Crashpad Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef CRASHPAD_HANDLER_CRASH_REPORT_UPLOAD_THREAD_H_
+#define CRASHPAD_HANDLER_CRASH_REPORT_UPLOAD_THREAD_H_
+
+#include "base/basictypes.h"
+
+#include <string>
+
+#include "base/memory/scoped_ptr.h"
+#include "client/crash_report_database.h"
+#include "util/synchronization/semaphore.h"
+
+namespace crashpad {
+
+namespace internal {
+class CrashReportUploadHelperThread;
+}  // namespace internal
+
+//! \brief A thread that processes pending crash reports in a
+//!     CrashReportDatabase by uploading them or marking them as completed
+//!     without upload, as desired.
+//!
+//! A producer of crash reports should notify an object of this class that a new
+//! report has been added to the database by calling ReportPending().
+//!
+//! Independently of being triggered by ReportPending(), objects of this class
+//! periodically examine the database for pending reports. This allows failed
+//! upload attempts for reports left in the pending state to be retried. It also
+//! catches reports that are added without a ReportPending() signal being
+//! caught. This may happen if crash reports are added to the database by other
+//! processes.
+class CrashReportUploadThread {
+ public:
+  //! \brief Constructs a new object.
+  //!
+  //! \param[in] database The database to upload crash reports from.
+  //! \param[in] url The URL of the server to upload crash reports to.
+  CrashReportUploadThread(CrashReportDatabase* database,
+                          const std::string& url);
+  ~CrashReportUploadThread();
+
+  //! \brief Starts a dedicated upload thread, which executes ThreadMain().
+  //!
+  //! This method may only be be called on a newly-constructed object or after
+  //! a call to Stop().
+  void Start();
+
+  //! \brief Stops the upload thread.
+  //!
+  //! The upload thread will terminate after completing whatever task it is
+  //! performing. If it is not performing any task, it will terminate
+  //! immediately. This method blocks while waiting for the upload thread to
+  //! terminate.
+  //!
+  //! This method must only be called after Start(). If Start() has been called,
+  //! this method must be called before destroying an object of this class.
+  //!
+  //! This method may be called from any thread other than the upload thread.
+  //! It is expected to only be called from the same thread that called Start().
+  void Stop();
+
+  //! \brief Informs the upload thread that a new pending report has been added
+  //!     to the database.
+  //!
+  //! This method may be called from any thread.
+  void ReportPending();
+
+ private:
+  friend internal::CrashReportUploadHelperThread;
+
+  //! \brief The result code from UploadReport().
+  enum class UploadResult {
+    //! \brief The crash report was uploaded successfully.
+    kSuccess,
+
+    //! \brief The crash report upload failed in such a way that recovery is
+    //!     impossible.
+    //!
+    //! No further upload attempts should be made for the report.
+    kPermanentFailure,
+
+    //! \brief The crash report upload failed, but it might succeed again if
+    //!     retried in the future.
+    //!
+    //! If the report has not already been retried too many times, the caller
+    //! may arrange to call UploadReport() for the report again in the future,
+    //! after a suitable delay.
+    kRetry,
+  };
+
+  //! \brief Calls ProcessPendingReports() in response to ReportPending() having
+  //!     been called on any thread, as well as periodically on a timer.
+  void ThreadMain();
+
+  //! \brief Obtains all pending reports from the database, and calls
+  //!     ProcessPendingReport() to process each one.
+  void ProcessPendingReports();
+
+  //! \brief Processes a single pending report from the database.
+  //!
+  //! \param[in] report The crash report to process.
+  //!
+  //! If report upload is enabled, this method attempts to upload \a report by
+  //! calling UplaodReport(). If the upload is successful, the report will be
+  //! marked as “completed” in the database. If the upload fails and more
+  //! retries are desired, the report’s upload-attempt count and
+  //! last-upload-attempt time will be updated in the database and it will
+  //! remain in the “pending” state. If the upload fails and no more retries are
+  //! desired, or report upload is disabled, it will be marked as “completed” in
+  //! the database without ever having been uploaded.
+  void ProcessPendingReport(const CrashReportDatabase::Report& report);
+
+  //! \brief Attempts to upload a crash report.
+  //!
+  //! \param[in] report The report to upload. The caller is responsible for
+  //!     calling CrashReportDatabase::GetReportForUploading() before calling
+  //!     this method, and for calling
+  //!     CrashReportDatabase::RecordUploadAttempt() after calling this method.
+  //! \param[out] response_body If the upload attempt is successful, this will
+  //!     be set to the response body sent by the server. Breakpad-type servers
+  //!     provide the crash ID assigned by the server in the response body.
+  //!
+  //! \return A member of UploadResult indicating the result of the upload
+  //!    attempt.
+  UploadResult UploadReport(const CrashReportDatabase::Report* report,
+                            std::string* response_body);
+
+  std::string url_;
+  CrashReportDatabase* database_;  // weak
+  Semaphore semaphore_;  // TODO(mark): Use a condition variable instead?
+  scoped_ptr<internal::CrashReportUploadHelperThread> thread_;
+  bool running_;
+};
+
+}  // namespace crashpad
+
+#endif  // CRASHPAD_HANDLER_CRASH_REPORT_UPLOAD_THREAD_H_