logd: record and replay log messages
To profile different log buffer types and configuration, this change
adds the ability to record log messages and adds a tool that will
replay those log messages through different log buffer implementations
and collect stats about the execution.
Test: log messages replay correctly
Change-Id: I0dc6c545b782fa7732e325dde109c496b137d0dd
diff --git a/logd/RecordingLogBuffer.h b/logd/RecordingLogBuffer.h
new file mode 100644
index 0000000..49a0aba
--- /dev/null
+++ b/logd/RecordingLogBuffer.h
@@ -0,0 +1,43 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * 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.
+ */
+
+#pragma once
+
+#include "SimpleLogBuffer.h"
+
+#include <string>
+#include <tuple>
+#include <vector>
+
+#include <android-base/unique_fd.h>
+
+#include "RecordedLogMessage.h"
+
+class RecordingLogBuffer : public SimpleLogBuffer {
+ public:
+ RecordingLogBuffer(LogReaderList* reader_list, LogTags* tags, LogStatistics* stats)
+ : SimpleLogBuffer(reader_list, tags, stats) {}
+
+ int Log(log_id_t log_id, log_time realtime, uid_t uid, pid_t pid, pid_t tid, const char* msg,
+ uint16_t len) override;
+
+ private:
+ void RecordLogMessage(log_id_t log_id, log_time realtime, uid_t uid, pid_t pid, pid_t tid,
+ const char* msg, uint16_t len);
+
+ std::vector<std::pair<RecordedLogMessage, std::string>> since_boot_messages_;
+ android::base::unique_fd fd_;
+};