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|
package notifier
import (
"context"
"fmt"
"log"
"os"
"time"
"codeberg.org/snonux/gorum/internal/config"
)
func Start(ctx context.Context, conf config.Config, scoreCh <-chan string) {
changedCh := make(chan email, 1)
errorCh := make(chan email, 1)
update := func(ch chan email, email email) {
// Replace (update) current element in the channel.
if cap(ch) == len(ch) {
<-ch
}
ch <- email
}
go func() {
go sendEmail(ctx, "change report", conf, changedCh)
go sendEmail(ctx, "error report", conf, errorCh)
for scoresStr := range scoreCh {
if err := persistToDisk(conf, scoresStr); err != nil {
update(errorCh, email{"GORUM error", err.Error()})
}
update(changedCh, email{"GORUM changed", scoresStr})
}
}()
}
func sendEmail(ctx context.Context, what string, conf config.Config, ch <-chan email) {
throttleDuration := time.Duration(conf.MailThrottle)
for {
select {
case email := <-ch:
if err := email.send(conf); err != nil {
log.Println(err)
}
case <-ctx.Done():
return
}
select {
case <-time.After(throttleDuration):
log.Println("notifier:", what, "slept some seconds", throttleDuration)
case <-ctx.Done():
return
}
}
}
func persistToDisk(conf config.Config, scoresStr string) error {
if _, err := os.Stat(conf.StateDir); os.IsNotExist(err) {
if err := os.MkdirAll(conf.StateDir, 0755); err != nil {
return err
}
}
return writeFileViaTmp(fmt.Sprintf("%s/%s", conf.StateDir, conf.ScoreFile), scoresStr)
}
func writeFileViaTmp(filePath, content string) error {
tmpFilePath := fmt.Sprintf("%s.tmp", filePath)
fd, err := os.Create(tmpFilePath)
if err != nil {
return err
}
defer fd.Close()
if _, err := fd.WriteString(content); err != nil {
return err
}
if err := fd.Sync(); err != nil {
return err
}
return os.Rename(tmpFilePath, filePath)
}
|
