move wrapper files

server/wrapper.go

@@ -0,0 +1,27 @@
+package server
+
+import (
+	"context"
+)
+
+// HandlerFunc represents a single method of a handler. It's used primarily
+// for the wrappers. What's handed to the actual method is the concrete
+// request and response types.
+type HandlerFunc func(ctx context.Context, req Request, rsp interface{}) error
+
+// SubscriberFunc represents a single method of a subscriber. It's used primarily
+// for the wrappers. What's handed to the actual method is the concrete
+// publication message.
+type SubscriberFunc func(ctx context.Context, msg Message) error
+
+// HandlerWrapper wraps the HandlerFunc and returns the equivalent
+type HandlerWrapper func(HandlerFunc) HandlerFunc
+
+// SubscriberWrapper wraps the SubscriberFunc and returns the equivalent
+type SubscriberWrapper func(SubscriberFunc) SubscriberFunc
+
+// StreamWrapper wraps a Stream interface and returns the equivalent.
+// Because streams exist for the lifetime of a method invocation this
+// is a convenient way to wrap a Stream as its in use for trace, monitoring,
+// metrics, etc.
+type StreamWrapper func(Stream) Stream