Define the Settings interface for a CrashReportDatabase and provide a Mac implementation.

client/settings.h

+// 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_CLIENT_SETTINGS_H_
+#define CRASHPAD_CLIENT_SETTINGS_H_
+
+#include <time.h>
+
+#include <string>
+
+#include "base/basictypes.h"
+
+namespace crashpad {
+
+//! \brief An interface for accessing and modifying the settings of a
+//!     CrashReportDatabase.
+//!
+//! This class cannot be instantiated directly, but rather an instance of it
+//! should be retrieved via CrashReportDatabase::GetSettings().
+class Settings {

[Mark Mentovai, 2015/03/08 05:21:56]

I thought this might be a nested class inside CrashReportDatabase, but that’s
not a strong preference.

[Robert Sesek, 2015/03/08 22:15:36]

The Database interface is large enough as it is. A separate file seemed
warranted.

+ public:
+  //! \brief Retrieves the immutable identifier for this client, which is used
+  //!     to locate all crash reports from a specific Crashpad database.
+  //!
+  //! \param[out] client_id The unique client identifier.
+  //!
+  //! \return On success, returns `true`, otherwise returns `false` with an
+  //!     error logged.
+  virtual bool GetClientID(std::string* client_id) = 0;

[Mark Mentovai, 2015/03/08 05:21:56]

Shouldn’t this pass a UUID* back?

[Robert Sesek, 2015/03/08 22:15:35]

I think the server is going to deal only in strings, so I think it makes sense
to store it as a string.

[Mark Mentovai, 2015/03/09 14:01:23]

Robert Sesek wrote:
You could make the same argument about report IDs in the database, and this is
related pretty closely to the database so the inconsistency seems a little
weird.

+
+  //! \brief Retrieves the user’s preference for submitting crash reports to a
+  //!     collection server.
+  //!
+  //! \param[out] enabled Whether crash reports should be uploaded.
+  //!
+  //! \return On success, returns `true`, otherwise returns `false` with an
+  //!     error logged.

[Mark Mentovai, 2015/03/08 05:21:56]

As implemented for Mac, these can return false with no error logged if the key
was missing from the dictionary. I do think that this is a mistake, though, I
think key-missing should be handled by the settings implementation. See comments
in the implementation file.

[Robert Sesek, 2015/03/08 22:15:35]

Done.

+  virtual bool GetUploadsEnabled(bool* enabled) = 0;
+
+  //! \brief Sets the user’s preference for submitting crash reports to a
+  //!     collection server.
+  //!
+  //! \param[in] enabled Whether crash reports should be uploaded.
+  //!
+  //! \return On success, returns `true`, otherwise returns `false` with an
+  //!     error logged.
+  virtual bool SetUploadsEnabled(bool enabled) = 0;
+
+  //! \brief Retrieves the last time at which a report was attempted to be
+  //!     uploaded.
+  //!
+  //! \param[out] time The last time at which a report was uploaded.
+  //!
+  //! \return On success, returns `true`, otherwise returns `false` with an
+  //!     error logged.
+  virtual bool GetLastUploadAttemptTime(time_t* time) = 0;
+
+  //! \brief Sets the last time at which a report was attempted to be uploaded.
+  //!
+  //! This is only meant to be used internally by the CrashReportDatabase.
+  //!
+  //! \param[in] time The last time at which a report was uploaded.
+  //!
+  //! \return On success, returns `true`, otherwise returns `false` with an
+  //!     error logged.
+  virtual bool SetLastUploadAttemptTime(time_t time) = 0;
+
+ protected:
+  Settings() {}
+  virtual ~Settings() {}
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(Settings);
+};
+
+}  // namespace crashpad
+
+#endif  // CRASHPAD_CLIENT_SETTINGS_H_