Merge pull request #1426 from Proheeler/v1.x

tcp_sink implementation for fluentbit

include/spdlog/tcp_sink.h

+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#include <spdlog/spdlog.h>
+#include <spdlog/sinks/base_sink.h>
+#include <spdlog/common-inl.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+#include <unistd.h>
+
+template<typename Mutex>
+class tcp_sink : public spdlog::sinks::base_sink <Mutex>
+{
+public:
+    tcp_sink(std::string address,int port)
+    {
+        if ((sock_ = socket(AF_INET, SOCK_STREAM, 0)) < 0)
+        {
+            SPDLOG_THROW(spdlog::spdlog_ex("Socket creation error", errno));
+        }
+        serv_addr_.sin_family = AF_INET;
+        serv_addr_.sin_port = htons(port);
+        if(inet_pton(AF_INET, address.c_str(), &serv_addr_.sin_addr)<=0)
+        {
+            SPDLOG_THROW(spdlog::spdlog_ex("Invalid address/ Address not supported", errno));
+        }
+        if (connect(sock_, (struct sockaddr *)&serv_addr_, sizeof(serv_addr_)) < 0)
+        {
+            SPDLOG_THROW(spdlog::spdlog_ex("Connection Failed", errno));
+        }
+
+    }
+protected:
+    void sink_it_(const spdlog::details::log_msg& msg) override
+    {
+        spdlog::memory_buf_t formatted;
+        spdlog::sinks::base_sink<Mutex>::formatter_->format(msg, formatted);
+        int res = send(sock_ , formatted.data() , formatted.size() , 0 );
+        if(res < 0)
+            SPDLOG_THROW(spdlog::spdlog_ex("Message Send Failed", errno));
+    }
+
+    void flush_() override
+    {
+    }
+private:
+    int sock_;
+    struct sockaddr_in serv_addr_;
+};
+using tcp_sink_mt = tcp_sink<std::mutex>;
+using tcp_sink_st = tcp_sink<spdlog::details::null_mutex>;