74 lines
1.5 KiB
Go
74 lines
1.5 KiB
Go
package main
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import (
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"log/slog"
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"math/rand/v2"
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"os"
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"time"
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"github.com/fsnotify/fsnotify"
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"gopkg.in/yaml.v3"
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)
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type InputDb map[int]string
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func newInputDbFromFile(path string, db *InputDb) {
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file, err := os.ReadFile(path)
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if err != nil {
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slog.Error("Could not open file", "path", path)
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os.Exit(1)
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}
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err = yaml.Unmarshal(file, &db)
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if err != nil {
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slog.Error("Error unmarshaling", "path", path, "error", err)
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} else {
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slog.Info("Reloaded Input", "path", path)
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}
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}
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func (db InputDb) Lookup(key int) string {
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value, ok := db[key]
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if !ok {
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return "X"
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}
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return value
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}
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func main() {
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var db InputDb
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done := make(chan struct{}, 1)
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ticker := time.NewTicker(3 * time.Millisecond)
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watcher, err := fsnotify.NewWatcher()
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if err != nil {
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slog.Error("Could not create Watcher", "error", err)
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}
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defer watcher.Close()
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newInputDbFromFile("input/input.yml", &db)
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slog.Info("Loaded DB", "db", db)
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err = watcher.Add("input/input.yml")
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if err != nil {
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slog.Error("Could not watch path", "path", "input/input.yml")
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}
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go func() {
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for {
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select {
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case t := <-ticker.C:
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key := rand.IntN(9) + 1
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value := db.Lookup(key)
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slog.Info("Got Rand", "key", key, "value", value, "ticker", t)
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case event, ok := <-watcher.Events:
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if !ok {
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slog.Error("Could not log Event", "event.name", event.Name, "event.op", event.Op)
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}
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slog.Info("Got Event", "event.name", event.Name, "event.op", event.Op)
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newInputDbFromFile("input/input.yml", &db)
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}
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}
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}()
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<-done
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}
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