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caddyfile.go
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caddyfile.go
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// Copyright 2021 Paul Greenberg greenpau@outlook.com
//
// 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 appd
import (
"fmt"
"github.com/caddyserver/caddy/v2/caddyconfig"
"github.com/caddyserver/caddy/v2/caddyconfig/caddyfile"
"github.com/caddyserver/caddy/v2/caddyconfig/httpcaddyfile"
"github.com/greenpau/caddy-appd/pkg/services"
)
func init() {
httpcaddyfile.RegisterGlobalOption("appd", parseCaddyfile)
}
// parseCaddyfile sets up a service manager.
//
// Syntax:
//
// appd {
// <command|app> <alias> {
// workdir <path/to/dir>
// cmd <path/to/command> [args]
// args [arg1] [arg2] ... [argN]
// }
//
// command hostname {
// cmd hostname
// }
//
// app test-py-http-server {
// cmd python3 -m http.server 4080
// }
//
// app test-py-http-server-4081
// cmd python3
// args -m http.server 4081
// }
// }
var argRules = map[string]argRule{
"cmd": argRule{Min: 1, Max: 255},
"args": argRule{Min: 1, Max: 255},
"noop": argRule{},
}
type argRule struct {
Min int
Max int
}
func parseCaddyfile(d *caddyfile.Dispenser, _ interface{}) (interface{}, error) {
app := new(App)
app.Config = services.NewConfig()
if !d.Next() {
return nil, d.ArgErr()
}
for d.NextBlock(0) {
switch d.Val() {
case "command", "app":
dk := d.Val()
args := d.RemainingArgs()
if len(args) != 1 {
return nil, d.ArgErr()
}
unit, err := services.NewUnit(dk, args[0])
if err != nil {
return nil, d.Errf("%s", err)
}
for nesting := d.Nesting(); d.NextBlock(nesting); {
k := d.Val()
v := d.RemainingArgs()
if err := validateArg(k, v); err != nil {
return nil, d.Errf("%s", err)
}
switch k {
case "cmd":
if len(v) > 1 {
unit.Command = v[0]
unit.Arguments = append(unit.Arguments, v[1:]...)
break
}
unit.Command = v[0]
case "args":
unit.Arguments = append(unit.Arguments, v...)
case "stdout_file":
unit.StdOutFilePath = v[0]
case "stderr_file":
unit.StdErrFilePath = v[0]
case "noop":
unit.Noop = true
default:
// return nil, d.Errf("k: %v, v: %v", k, v)
return nil, d.Errf("unsupported %q key", k)
}
}
if err := app.Config.AddUnit(unit); err != nil {
return nil, d.Err(err.Error())
}
default:
return nil, d.ArgErr()
}
}
return httpcaddyfile.App{
Name: appName,
Value: caddyconfig.JSON(app, nil),
}, nil
}
func validateArg(k string, v []string) error {
r, exists := argRules[k]
if !exists {
return nil
}
if r.Min > len(v) {
return fmt.Errorf("too few args for %q directive", k)
}
if r.Max < len(v) {
return fmt.Errorf("too many args for %q directive", k)
}
return nil
}