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/*
GoToSocial
Copyright (C) 2021-2023 GoToSocial Authors admin@gotosocial.org
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package main
import (
"flag"
"fmt"
"io"
"os"
"os/exec"
"reflect"
"strings"
"github.com/superseriousbusiness/gotosocial/internal/config"
)
const license = `/*
GoToSocial
Copyright (C) 2021-2023 GoToSocial Authors admin@gotosocial.org
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
`
func main() {
var out string
// Load runtime config flags
flag.StringVar(&out, "out", "", "Generated file output path")
flag.Parse()
// Open output file path
output, err := os.OpenFile(out, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0o644)
if err != nil {
panic(err)
}
fmt.Fprint(output, "// THIS IS A GENERATED FILE, DO NOT EDIT BY HAND\n")
fmt.Fprint(output, license)
fmt.Fprint(output, "package config\n\n")
fmt.Fprint(output, "import (\n")
fmt.Fprint(output, "\t\"time\"\n\n")
fmt.Fprint(output, "\t\"codeberg.org/gruf/go-bytesize\"\n")
fmt.Fprint(output, ")\n\n")
generateFields(output, nil, reflect.TypeOf(config.Configuration{}))
_ = output.Close()
_ = exec.Command("gofumports", "-w", out).Run()
// The plan here is that eventually we might be able
// to generate an example configuration from struct tags
}
func generateFields(output io.Writer, prefixes []string, t reflect.Type) {
for i := 0; i < t.NumField(); i++ {
field := t.Field(i)
if ft := field.Type; ft.Kind() == reflect.Struct {
// This is a struct field containing further nested config vars.
generateFields(output, append(prefixes, field.Name), ft)
continue
}
// Get prefixed config variable name
name := strings.Join(prefixes, "") + field.Name
// Get period-separated (if nested) config variable "path"
fieldPath := strings.Join(append(prefixes, field.Name), ".")
// Get dash-separated config variable CLI flag "path"
flagPath := strings.Join(append(prefixes, field.Tag.Get("name")), "-")
flagPath = strings.ToLower(flagPath)
// ConfigState structure helper methods
fmt.Fprintf(output, "// Get%s safely fetches the Configuration value for state's '%s' field\n", name, fieldPath)
fmt.Fprintf(output, "func (st *ConfigState) Get%s() (v %s) {\n", name, field.Type.String())
fmt.Fprintf(output, "\tst.mutex.Lock()\n")
fmt.Fprintf(output, "\tv = st.config.%s\n", fieldPath)
fmt.Fprintf(output, "\tst.mutex.Unlock()\n")
fmt.Fprintf(output, "\treturn\n")
fmt.Fprintf(output, "}\n\n")
fmt.Fprintf(output, "// Set%s safely sets the Configuration value for state's '%s' field\n", name, fieldPath)
fmt.Fprintf(output, "func (st *ConfigState) Set%s(v %s) {\n", name, field.Type.String())
fmt.Fprintf(output, "\tst.mutex.Lock()\n")
fmt.Fprintf(output, "\tdefer st.mutex.Unlock()\n")
fmt.Fprintf(output, "\tst.config.%s = v\n", fieldPath)
fmt.Fprintf(output, "\tst.reloadToViper()\n")
fmt.Fprintf(output, "}\n\n")
// Global ConfigState helper methods
// TODO: remove when we pass around a ConfigState{}
fmt.Fprintf(output, "// %sFlag returns the flag name for the '%s' field\n", name, fieldPath)
fmt.Fprintf(output, "func %sFlag() string { return \"%s\" }\n\n", name, flagPath)
fmt.Fprintf(output, "// Get%s safely fetches the value for global configuration '%s' field\n", name, fieldPath)
fmt.Fprintf(output, "func Get%[1]s() %[2]s { return global.Get%[1]s() }\n\n", name, field.Type.String())
fmt.Fprintf(output, "// Set%s safely sets the value for global configuration '%s' field\n", name, fieldPath)
fmt.Fprintf(output, "func Set%[1]s(v %[2]s) { global.Set%[1]s(v) }\n\n", name, field.Type.String())
}
}
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