package micro import ( "github.com/micro/go-micro/client" "github.com/micro/go-micro/metadata" "golang.org/x/net/context" ) type clientWrapper struct { client.Client headers metadata.Metadata } func (c *clientWrapper) setHeaders(ctx context.Context) context.Context { md := make(metadata.Metadata) if mda, ok := metadata.FromContext(ctx); ok { // make copy of metadata for k, v := range mda { md[k] = v } } for k, v := range c.headers { if _, ok := md[k]; !ok { md[k] = v } } return metadata.NewContext(ctx, md) } func (c *clientWrapper) Call(ctx context.Context, req client.Request, rsp interface{}, opts ...client.CallOption) error { ctx = c.setHeaders(ctx) return c.Client.Call(ctx, req, rsp, opts...) } func (c *clientWrapper) Stream(ctx context.Context, req client.Request, opts ...client.CallOption) (client.Streamer, error) { ctx = c.setHeaders(ctx) return c.Client.Stream(ctx, req, opts...) } func (c *clientWrapper) Publish(ctx context.Context, p client.Publication, opts ...client.PublishOption) error { ctx = c.setHeaders(ctx) return c.Client.Publish(ctx, p, opts...) }