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// Copyright 2015 Matthew Holt and The Caddy Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package eventsconfig is for configuring caddyevents.App with the
// Caddyfile. This code can't be in the caddyevents package because
// the httpcaddyfile package imports caddyhttp, which imports
// caddyevents: hence, it creates an import cycle.
package eventsconfig
import (
"encoding/json"
"github.com/caddyserver/caddy/v2/caddyconfig"
"github.com/caddyserver/caddy/v2/caddyconfig/caddyfile"
"github.com/caddyserver/caddy/v2/caddyconfig/httpcaddyfile"
"github.com/caddyserver/caddy/v2/modules/caddyevents"
)
func init() {
httpcaddyfile.RegisterGlobalOption("events", parseApp)
}
// parseApp configures the "events" global option from Caddyfile to set up the events app.
// Syntax:
//
// events {
// on <event> <handler_module...>
// }
//
// If <event> is *, then it will bind to all events.
func parseApp(d *caddyfile.Dispenser, _ any) (any, error) {
app := new(caddyevents.App)
// consume the option name
if !d.Next() {
return nil, d.ArgErr()
}
// handle the block
for d.NextBlock(0) {
switch d.Val() {
case "on":
if !d.NextArg() {
return nil, d.ArgErr()
}
eventName := d.Val()
if eventName == "*" {
eventName = ""
}
if !d.NextArg() {
return nil, d.ArgErr()
}
handlerName := d.Val()
modID := "events.handlers." + handlerName
unm, err := caddyfile.UnmarshalModule(d, modID)
if err != nil {
return nil, err
}
app.Subscriptions = append(app.Subscriptions, &caddyevents.Subscription{
Events: []string{eventName},
HandlersRaw: []json.RawMessage{
caddyconfig.JSONModuleObject(unm, "handler", handlerName, nil),
},
})
default:
return nil, d.ArgErr()
}
}
return httpcaddyfile.App{
Name: "events",
Value: caddyconfig.JSON(app, nil),
}, nil
}
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