Sync async_nats work with master

Signed-off-by: Alex Ellis <alexellis2@gmail.com>

gateway/handlers/asyncreport.go

@@ -0,0 +1,23 @@
+package handlers
+
+import (
+	"encoding/json"
+	"io/ioutil"
+	"net/http"
+
+	"github.com/alexellis/faas/gateway/metrics"
+	"github.com/alexellis/faas/gateway/requests"
+)
+
+// MakeAsyncReport makes a handler for asynchronous invocations to report back into.
+func MakeAsyncReport(metrics metrics.MetricOptions) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		defer r.Body.Close()
+
+		report := requests.AsyncReport{}
+		bytesOut, _ := ioutil.ReadAll(r.Body)
+		json.Unmarshal(bytesOut, &report)
+
+		trackInvocation(report.FunctionName, metrics, report.StatusCode)
+	}
+}