Refactor Caddyfile adapter and module registration

Use piles from which to draw config values.

Module values can return their name, so now we can do two-way mapping
from value to name and name to value; whereas before we could only map
name to value. This was problematic with the Caddyfile adapter since
it receives values and needs to know the name to put in the config.

1 files changed, 9 insertions, 4 deletions

diff --git a/modules/caddyhttp/staticerror.go b/modules/caddyhttp/staticerror.go
index 1834cf7..3a45366 100644
--- a/modules/caddyhttp/staticerror.go
+++ b/modules/caddyhttp/staticerror.go
@@ -23,10 +23,7 @@ import (
 )
 
 func init() {
-	caddy.RegisterModule(caddy.Module{
-		Name: "http.handlers.error",
-		New:  func() interface{} { return new(StaticError) },
-	})
+	caddy.RegisterModule(StaticError{})
 }
 
 // StaticError implements a simple handler that returns an error.
@@ -35,6 +32,14 @@ type StaticError struct {
 	StatusCode WeakString `json:"status_code,omitempty"`
 }
 
+// CaddyModule returns the Caddy module information.
+func (StaticError) CaddyModule() caddy.ModuleInfo {
+	return caddy.ModuleInfo{
+		Name: "http.handlers.error",
+		New:  func() caddy.Module { return new(StaticError) },
+	}
+}
+
 func (e StaticError) ServeHTTP(w http.ResponseWriter, r *http.Request, _ Handler) error {
 	repl := r.Context().Value(caddy.ReplacerCtxKey).(caddy.Replacer)