move common types to an internal package

This helps avoid import cycles.

1 files changed, 28 insertions, 0 deletions

diff --git a/internal/types/handler.go b/internal/types/handler.go
new file mode 100644
index 0000000..4805c57
--- /dev/null
+++ b/internal/types/handler.go
@@ -0,0 +1,28 @@
+package types
+
+import "context"
+
+// Handler is a type which can turn a request into a response.
+//
+// Handle may return a nil response, in which case the Server is expected
+// to build the protocol-appropriate "Not Found" response.
+type Handler interface {
+	Handle(context.Context, *Request) *Response
+}
+
+// Middleware is a handler decorator.
+//
+// It returns a handler which may call the passed-in handler or not, or may
+// transform the request or response in some way.
+type Middleware func(Handler) Handler
+
+func HandlerFunc(f func(context.Context, *Request) *Response) Handler {
+	return handlerFunc(f)
+}
+
+// Handle implements Handler.
+func (f handlerFunc) Handle(ctx context.Context, request *Request) *Response {
+	return f(ctx, request)
+}
+
+type handlerFunc func(context.Context, *Request) *Response