Update TwiN/health to v1.1.0

vendor/github.com/TwiN/health/Makefile

@@ -0,0 +1,2 @@
+bench:
+	go test -bench . -race

vendor/github.com/TwiN/health/health.go

@@ -1,6 +1,9 @@
 package health
 
-import "net/http"
+import (
+	"net/http"
+	"sync"
+)
 
 var (
 	handler = &healthHandler{
@@ -13,6 +16,8 @@ var (
 type healthHandler struct {
 	useJSON bool
 	status  Status
+
+	sync.RWMutex
 }
 
 // WithJSON configures whether the handler should output a response in JSON or in raw text
@@ -24,30 +29,48 @@ func (h *healthHandler) WithJSON(v bool) *healthHandler {
 }
 
 // ServeHTTP serves the HTTP request for the health handler
-func (h healthHandler) ServeHTTP(writer http.ResponseWriter, _ *http.Request) {
-	var status int
+func (h *healthHandler) ServeHTTP(writer http.ResponseWriter, _ *http.Request) {
+	var statusCode int
 	var body []byte
-	if h.status == Up {
-		status = http.StatusOK
+	handlerStatus := h.getStatus()
+	if handlerStatus == Up {
+		statusCode = http.StatusOK
 	} else {
-		status = http.StatusInternalServerError
+		statusCode = http.StatusInternalServerError
 	}
 	if h.useJSON {
 		writer.Header().Set("Content-Type", "application/json")
-		body = []byte(`{"status":"` + h.status + `"}`)
+		body = []byte(`{"status":"` + handlerStatus + `"}`)
 	} else {
-		body = []byte(h.status)
+		body = []byte(handlerStatus)
 	}
-	writer.WriteHeader(status)
+	writer.WriteHeader(statusCode)
 	_, _ = writer.Write(body)
 }
 
+func (h *healthHandler) getStatus() Status {
+	h.Lock()
+	defer h.Unlock()
+	return h.status
+}
+
+func (h *healthHandler) setStatus(status Status) {
+	h.Lock()
+	h.status = status
+	h.Unlock()
+}
+
 // Handler retrieves the health handler
 func Handler() *healthHandler {
 	return handler
 }
 
-// SetStatus sets the status to be reflected by the health handler
-func SetStatus(status Status) {
-	handler.status = status
+// GetStatus retrieves the current status returned by the health handler
+func GetStatus() Status {
+	return handler.getStatus()
+}
+
+// SetStatus sets the status to be returned by the health handler
+func SetStatus(status Status) {
+	handler.setStatus(status)
 }