71 lines
1.4 KiB
Go
71 lines
1.4 KiB
Go
// Copyright © 2023 Roberto Hidalgo <event-gateway@un.rob.mx>
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// SPDX-License-Identifier: Apache-2.0
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package config
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import (
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"encoding/json"
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"fmt"
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"io/fs"
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"os"
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"os/signal"
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"syscall"
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"git.rob.mx/nidito/chinampa/pkg/logger"
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)
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var flog = logger.Sub("event-gateway.config.file")
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var FS fs.FS
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type fileSchema map[string]*Listener
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type File struct {
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Path string
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}
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var _ Loader = &File{}
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func (l *File) String() string {
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return fmt.Sprintf("FileLoader at %s", l.Path)
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}
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func (l *File) Load() (res []*Listener, err error) {
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var data []byte
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if FS != nil {
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data, err = fs.ReadFile(FS, l.Path)
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} else {
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data, err = os.ReadFile(l.Path)
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}
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if err != nil {
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return res, fmt.Errorf("could not read %s: %s", l.Path, err)
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}
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config := &fileSchema{}
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if err := json.Unmarshal(data, &config); err != nil {
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return res, fmt.Errorf("could not unserialize %s as json: %s", l.Path, err)
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}
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for name, listener := range *config {
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listener.ID = name
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res = append(res, listener)
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}
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return res, nil
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}
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func (l *File) Watch(reg chan []*Listener) {
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c := make(chan os.Signal, 1)
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signal.Notify(c, syscall.SIGHUP)
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go func() {
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for {
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<-c
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flog.Info("SIGHUP detected, reloading file configuration")
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res, err := l.Load()
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if err != nil {
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flog.Errorf("could not reload file configuration: %s", err)
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}
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flog.Info("Reloaded file configuration, updating listeners")
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reg <- res
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}
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}()
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}
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