client: add call option helper

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

api/router/options.go

@@ -5,6 +5,7 @@ import (
 
 	"github.com/unistack-org/micro/v3/api/resolver"
 	"github.com/unistack-org/micro/v3/api/resolver/vpath"
+	"github.com/unistack-org/micro/v3/logger"
 	"github.com/unistack-org/micro/v3/registry"
 )
 
@@ -12,6 +13,7 @@ type Options struct {
 	Handler  string
 	Registry registry.Registry
 	Resolver resolver.Resolver
+	Logger   logger.Logger
 	Context  context.Context
 }
 

client/context.go

@@ -32,3 +32,13 @@ func SetPublishOption(k, v interface{}) PublishOption {
 		o.Context = context.WithValue(o.Context, k, v)
 	}
 }
+
+// SetCallOption returns a function to setup a context with given value
+func SetCallOption(k, v interface{}) CallOption {
+	return func(o *CallOptions) {
+		if o.Context == nil {
+			o.Context = context.Background()
+		}
+		o.Context = context.WithValue(o.Context, k, v)
+	}
+}