Add Message class

include/cppkafka/message.h

@@ -0,0 +1,36 @@
+#ifndef CPPKAFKA_MESSAGE_H
+#define CPPKAFKA_MESSAGE_H
+
+#include <memory>
+#include <cstdint>
+#include <librdkafka/rdkafka.h>
+#include "buffer.h"
+#include "topic.h"
+
+namespace cppkafka {
+
+class Message {
+public:
+    Message(rd_kafka_message_t* handle);
+
+    bool has_error() const;
+    rd_kafka_resp_err_t get_error() const;
+    std::string get_topic() const;
+    int get_partition() const;
+    const Buffer& get_payload() const;
+    const Buffer& get_key() const;
+    int64_t get_offset() const;
+    void* private_data();
+
+    rd_kafka_message_t* get_handle() const;
+private:
+    using HandlePtr = std::unique_ptr<rd_kafka_message_t, decltype(&rd_kafka_message_destroy)>;
+
+    HandlePtr handle_;
+    Buffer payload_;
+    Buffer key_;
+};
+
+} // cppkafka
+
+#endif // CPPKAFKA_MESSAGE_H