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

third_party/spdlog/include/spdlog/sinks/sink.h

@@ -0,0 +1,59 @@
+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+
+#include "spdlog/details/log_msg.h"
+#include "spdlog/details/pattern_formatter.h"
+#include "spdlog/formatter.h"
+
+namespace spdlog {
+namespace sinks {
+class sink
+{
+public:
+    sink()
+        : level_(level::trace)
+        , formatter_(new pattern_formatter())
+    {
+    }
+
+    explicit sink(std::unique_ptr<spdlog::pattern_formatter> formatter)
+        : level_(level::trace)
+        , formatter_(std::move(formatter))
+    {
+    }
+
+    virtual ~sink() = default;
+    virtual void log(const details::log_msg &msg) = 0;
+    virtual void flush() = 0;
+    virtual void set_pattern(const std::string &pattern) = 0;
+    virtual void set_formatter(std::unique_ptr<spdlog::formatter> sink_formatter) = 0;
+
+    bool should_log(level::level_enum msg_level) const
+    {
+        return msg_level >= level_.load(std::memory_order_relaxed);
+    }
+
+    void set_level(level::level_enum log_level)
+    {
+        level_.store(log_level);
+    }
+
+    level::level_enum level() const
+    {
+        return static_cast<spdlog::level::level_enum>(level_.load(std::memory_order_relaxed));
+    }
+
+protected:
+    // sink log level - default is all
+    level_t level_;
+
+    // sink formatter - default is full format
+    std::unique_ptr<spdlog::formatter> formatter_;
+};
+
+} // namespace sinks
+} // namespace spdlog