1 files changed, 63 insertions, 0 deletions
diff --git a/platform/node/src/node_logging.cpp b/platform/node/src/node_logging.cpp
new file mode 100644
index 0000000000..5e7326e90a
--- /dev/null
+++ b/platform/node/src/node_logging.cpp
@@ -0,0 +1,63 @@
+#include "node_logging.hpp"
+
+#include <mbgl/util/enum.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(std::move(text_)) {}
+};
+
+NodeLogObserver::NodeLogObserver(v8::Local<v8::Object> target)
+    : queue(new util::AsyncQueue<LogMessage>(uv_default_loop(), [this](LogMessage &message) {
+          Nan::HandleScope scope;
+
+          auto msg = Nan::New<v8::Object>();
+
+          Nan::Set(msg, Nan::New("class").ToLocalChecked(),
+              Nan::New(mbgl::Enum<mbgl::Event>::toString(message.event)).ToLocalChecked());
+
+          Nan::Set(msg, Nan::New("severity").ToLocalChecked(),
+              Nan::New(mbgl::Enum<mbgl::EventSeverity>::toString(message.severity)).ToLocalChecked());
+
+          if (message.code != -1) {
+              Nan::Set(msg, Nan::New("code").ToLocalChecked(),
+                  Nan::New<v8::Number>(message.code));
+          }
+
+          if (!message.text.empty()) {
+              Nan::Set(msg, Nan::New("text").ToLocalChecked(),
+                  Nan::New(message.text).ToLocalChecked());
+          }
+
+          v8::Local<v8::Value> argv[] = { Nan::New("message").ToLocalChecked(), msg };
+          auto handle = Nan::New<v8::Object>(module);
+          auto emit = Nan::To<v8::Object>(Nan::Get(handle, Nan::New("emit").ToLocalChecked()).ToLocalChecked()).ToLocalChecked();
+          Nan::CallAsFunction(emit, handle, 2, argv);
+      })) {
+    Nan::HandleScope scope;
+    module.Reset(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;
+}
+
+} // namespace node_mbgl