move node-mbgl to platform/node/ directory

platform/node/src/node_log.cpp

@@ -0,0 +1,54 @@
+#include "node_log.hpp"
+#include "util/async_queue.hpp"
+
+namespace node_mbgl {
+
+struct NodeLogObserver::LogMessage {
+    mbgl::EventSeverity severity;
+    mbgl::Event event;
+    int64_t code;
+    std::string text;
+
+    LogMessage(mbgl::EventSeverity severity_, mbgl::Event event_, int64_t code_, std::string text_)
+        : severity(severity_),
+        event(event_),
+        code(code_),
+        text(text_) {}
+};
+
+NodeLogObserver::NodeLogObserver(v8::Handle<v8::Object> target)
+    : queue(new Queue(uv_default_loop(), [this](LogMessage &message) {
+          NanScope();
+
+          auto msg = NanNew<v8::Object>();
+          msg->Set(NanNew("class"), NanNew(mbgl::EventClass(message.event).c_str()));
+          msg->Set(NanNew("severity"), NanNew(mbgl::EventSeverityClass(message.severity).c_str()));
+          if (message.code != -1) {
+              msg->Set(NanNew("code"), NanNew<v8::Number>(message.code));
+          }
+          if (!message.text.empty()) {
+              msg->Set(NanNew("text"), NanNew(message.text));
+          }
+
+          v8::Local<v8::Value> argv[] = { NanNew("message"), msg };
+          auto handle = NanNew<v8::Object>(module);
+          auto emit = handle->Get(NanNew("emit"))->ToObject();
+          emit->CallAsFunction(handle, 2, argv);
+      })) {
+    NanScope();
+    NanAssignPersistent(module, target);
+
+    // Don't keep the event loop alive.
+    queue->unref();
+}
+
+NodeLogObserver::~NodeLogObserver() {
+    queue->stop();
+}
+
+bool NodeLogObserver::onRecord(mbgl::EventSeverity severity, mbgl::Event event, int64_t code, const std::string &text) {
+    queue->send({ severity, event, code, text });
+    return true;
+}
+
+}