Add Acknowledge function to ApplicationCommandInteractionCreate for HTTP server interactions

discord/interaction_response.go

@@ -5,7 +5,9 @@ type InteractionResponseType int
 
 // Constants for the InteractionResponseType(s)
 const (
-	InteractionResponseTypePong InteractionResponseType = iota + 1
+	// This is stricly internal and will never be sent to discord. It is used to indicate that the HTTP response should be 202 Accepted
+	InteractionResponseTypeAcknowledge InteractionResponseType = iota
+	InteractionResponseTypePong        InteractionResponseType = iota
 	_
 	_
 	InteractionResponseTypeCreateMessage

events/interaction_events.go

@@ -42,6 +42,20 @@ func (e *ApplicationCommandInteractionCreate) Guild() (discord.Guild, bool) {
 	return discord.Guild{}, false
 }
 
+// Acknowledge acknowledges the interaction.
+//
+// This is used strictly for acknowledging the HTTP interaction request from discord. This responds with 202 Accepted.
+//
+// This does not produce a visible loading state to the user.
+// You are expected to send a new http request within 3 seconds to respond to the interaction.
+// This allows you to gracefully handle errors with your sent response & access the resulting message.
+// If you want to create a visible loading state, use DeferCreateMessage.
+//
+// Source docs: https://discord.com/developers/docs/interactions/receiving-and-responding#interaction-callback
+func (e *ApplicationCommandInteractionCreate) Acknowledge(opts ...rest.RequestOpt) error {
+	return e.Respond(discord.InteractionResponseTypeAcknowledge, nil, opts...)
+}
+
 // CreateMessage responds to the interaction with a new message.
 func (e *ApplicationCommandInteractionCreate) CreateMessage(messageCreate discord.MessageCreate, opts ...rest.RequestOpt) error {
 	return e.Respond(discord.InteractionResponseTypeCreateMessage, messageCreate, opts...)

httpserver/server.go

@@ -167,6 +167,15 @@ func HandleInteraction(publicKey PublicKey, logger *slog.Logger, handleFunc Even
 		defer cancel()
 		select {
 		case response := <-responseChannel:
+
+			// if we only acknowledge the interaction, we don't need to send a response body
+			// we just need to send a 202 Accepted status
+			if response.Type == discord.InteractionResponseTypeAcknowledge {
+				w.WriteHeader(http.StatusAccepted)
+				w.Write(nil)
+				return
+			}
+
 			if body, err = response.ToBody(); err != nil {
 				http.Error(w, "Internal Server Error", http.StatusInternalServerError)
 				errorChannel <- err