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71 lines
1.2 KiB
71 lines
1.2 KiB
package watcher
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import (
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"context"
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"fmt"
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"log"
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"time"
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"gitoa.ru/go-4devs/config"
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)
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var (
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_ config.Provider = (*Provider)(nil)
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_ config.WatchProvider = (*Provider)(nil)
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)
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func New(duration time.Duration, provider config.Provider, opts ...Option) *Provider {
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p := &Provider{
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Provider: provider,
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ticker: time.NewTicker(duration),
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logger: func(_ context.Context, msg string) {
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log.Print(msg)
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},
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}
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for _, opt := range opts {
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opt(p)
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}
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return p
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}
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func WithLogger(l func(context.Context, string)) Option {
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return func(p *Provider) {
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p.logger = l
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}
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}
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type Option func(*Provider)
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type Provider struct {
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config.Provider
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ticker *time.Ticker
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logger func(context.Context, string)
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}
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func (p *Provider) Watch(ctx context.Context, key config.Key, callback config.WatchCallback) error {
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oldVar, err := p.Provider.Read(ctx, key)
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if err != nil {
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return fmt.Errorf("%s: failed watch variable: %w", p.Provider.Name(), err)
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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 <-p.ticker.C:
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newVar, err := p.Provider.Read(ctx, key)
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if err != nil {
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p.logger(ctx, err.Error())
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} else if !newVar.IsEquals(oldVar) {
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callback(ctx, oldVar, newVar)
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oldVar = newVar
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}
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case <-ctx.Done():
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return
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}
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}
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}()
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return nil
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}
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