expose log messages to node.js

src/node_log.hpp

@@ -0,0 +1,32 @@
+#pragma once
+
+#include <mbgl/platform/log.hpp>
+#include <mbgl/util/async_queue.hpp>
+
+#include <node.h>
+#include <nan.h>
+
+namespace mbgl { namespace util { template <typename T> class AsyncQueue; } }
+
+namespace node_mbgl {
+
+class NodeLogBackend : public mbgl::LogBackend {
+public:
+    NodeLogBackend(v8::Handle<v8::Object> target);
+    ~NodeLogBackend();
+
+    void record(mbgl::EventSeverity severity, mbgl::Event event, const std::string &msg);
+    void record(mbgl::EventSeverity severity, mbgl::Event event, const char* format, ...);
+    void record(mbgl::EventSeverity severity, mbgl::Event event, int64_t code);
+    void record(mbgl::EventSeverity severity, mbgl::Event event, int64_t code, const std::string &msg);
+
+private:
+    v8::Persistent<v8::Object> module;
+
+    struct Message;
+    using Queue = mbgl::util::AsyncQueue<Message>;
+    Queue *queue = nullptr;
+};
+
+
+}