Merge branch 'master' into develop

pkg/middleware/request_tracing.go

@@ -0,0 +1,36 @@
+package middleware
+
+import (
+	"fmt"
+	"net/http"
+
+	opentracing "github.com/opentracing/opentracing-go"
+	"github.com/opentracing/opentracing-go/ext"
+
+	"gopkg.in/macaron.v1"
+)
+
+func RequestTracing(handler string) macaron.Handler {
+	return func(res http.ResponseWriter, req *http.Request, c *macaron.Context) {
+		rw := res.(macaron.ResponseWriter)
+
+		tracer := opentracing.GlobalTracer()
+		wireContext, _ := tracer.Extract(opentracing.HTTPHeaders, opentracing.HTTPHeadersCarrier(req.Header))
+		span := tracer.StartSpan(fmt.Sprintf("HTTP %s", handler), ext.RPCServerOption(wireContext))
+		defer span.Finish()
+
+		ctx := opentracing.ContextWithSpan(req.Context(), span)
+		c.Req.Request = req.WithContext(ctx)
+
+		c.Next()
+
+		status := rw.Status()
+
+		ext.HTTPStatusCode.Set(span, uint16(status))
+		ext.HTTPUrl.Set(span, req.RequestURI)
+		ext.HTTPMethod.Set(span, req.Method)
+		if status >= 400 {
+			ext.Error.Set(span, true)
+		}
+	}
+}