Add middleware to add IP addr from req. to context

pkg/api/ipaddr.go

@@ -0,0 +1,29 @@
+package api
+
+import (
+	"context"
+	"net/http"
+)
+
+// Key to use when setting the request ID.
+type ctxKeyRemoteAddr int
+
+// RemoteAddrKey is the key that holds th unique request ID in a request context.
+const remoteAddrKey ctxKeyRemoteAddr = 0
+
+// Packs remote address to context
+func remoteAddrToContext(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
+		next.ServeHTTP(w, req.WithContext(context.WithValue(req.Context(), remoteAddrKey, req.RemoteAddr)))
+	})
+}
+
+// RemoteAddrFromContext returns remote IP address from context
+func RemoteAddrFromContext(ctx context.Context) string {
+	v := ctx.Value(remoteAddrKey)
+	if str, ok := v.(string); ok {
+		return str
+	}
+
+	return ""
+}

pkg/api/logger.go

@@ -14,7 +14,7 @@ import (
 // contextLogger middleware binds logger to request's context.
 //
 // This allows us to use logger from context (with requestID)
-// inside our (generated) handers and controllers
+// inside our (generated) handlers and controllers
 func contextLogger(log *zap.Logger) func(next http.Handler) http.Handler {
 	return func(next http.Handler) http.Handler {
 		return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {

pkg/api/middleware.go

@@ -17,6 +17,7 @@ func BaseMiddleware(log *zap.Logger) []func(http.Handler) http.Handler {
 	return []func(http.Handler) http.Handler{
 		handleCORS,
 		middleware.RealIP,
+		remoteAddrToContext,
 		middleware.RequestID,
 		contextLogger(log),
 	}