use spdlog for logging in ws + unittest + remove un-needed mutex

third_party/spdlog/tests/test_sink.h

@@ -0,0 +1,59 @@
+//
+// Copyright(c) 2018 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+
+#include "spdlog/details/null_mutex.h"
+#include "spdlog/sinks/base_sink.h"
+
+#include <chrono>
+#include <mutex>
+#include <thread>
+
+namespace spdlog {
+namespace sinks {
+
+template<class Mutex>
+class test_sink : public base_sink<Mutex>
+{
+public:
+    size_t msg_counter()
+    {
+        std::lock_guard<Mutex> lock(base_sink<Mutex>::mutex_);
+        return msg_counter_;
+    }
+
+    size_t flush_counter()
+    {
+        std::lock_guard<Mutex> lock(base_sink<Mutex>::mutex_);
+        return flush_counter_;
+    }
+
+    void set_delay(std::chrono::milliseconds delay)
+    {
+        delay_ = delay;
+    }
+
+protected:
+    void sink_it_(const details::log_msg &) override
+    {
+        msg_counter_++;
+        std::this_thread::sleep_for(delay_);
+    }
+
+    void flush_() override
+    {
+        flush_counter_++;
+    }
+    size_t msg_counter_{0};
+    size_t flush_counter_{0};
+    std::chrono::milliseconds delay_{std::chrono::milliseconds::zero()};
+};
+
+using test_sink_mt = test_sink<std::mutex>;
+using test_sink_st = test_sink<details::null_mutex>;
+
+} // namespace sinks
+} // namespace spdlog