fix uninitialized response metadata for incoming context (#264)

.github/workflows/job_coverage.yml

@@ -8,8 +8,6 @@ on:
       - '.gitea/**'
   pull_request:
     branches: [ main, v3, v4 ]
-  # Allows you to run this workflow manually from the Actions tab
-  workflow_dispatch:
 
 jobs:
 

.github/workflows/job_lint.yml

@@ -20,7 +20,7 @@ jobs:
       uses: actions/setup-go@v5
       with:
         cache-dependency-path: "**/*.sum"
-        go-version: 'stable' 
+        go-version: 'stable'
     - name: setup deps
       run: go get -v ./...
     - name: run lint

.github/workflows/job_sync.yml

@@ -3,11 +3,6 @@ name: sync
 on:
   schedule:
     - cron: '*/5 * * * *'
-#  push:
-#    branches: [ master, v3, v4 ]
-#    paths-ignore:
-#      - '.github/**'
-#      - '.gitea/**'
   # Allows you to run this workflow manually from the Actions tab
   workflow_dispatch:
 

grpc.go

@@ -263,7 +263,7 @@ func (g *Server) handler(srv interface{}, stream grpc.ServerStream) error {
 	// create new context
 	ctx = metadata.NewIncomingContext(ctx, md)
 	ctx = metadata.NewOutgoingContext(ctx, metadata.New(0))
-	ctx = context.WithValue(ctx, rspMetadataKey{}, &rspMetadataVal{})
+	ctx = context.WithValue(ctx, rspMetadataKey{}, &rspMetadataVal{m: metadata.New(0)})
 
 	stream = &streamWrapper{ctx, stream}