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Code Issues Releases Activity

implement email notifications on failed backup runs

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This commit is contained in:
Frederik Ring
2021-09-09 08:58:03 +02:00
parent e46968ed79
commit 88368197c1
4 changed files with 106 additions and 15 deletions
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59
cmd/backup/main.go
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@@ -19,6 +19,7 @@ import (
"github.com/docker/docker/api/types/filters"
"github.com/docker/docker/api/types/swarm"
"github.com/docker/docker/client"
"github.com/go-gomail/gomail"
"github.com/gofrs/flock"
"github.com/kelseyhightower/envconfig"
"github.com/leekchan/timeutil"
@@ -74,20 +75,26 @@ type script struct {
type errorHook func(err error, start time.Time, logOutput string) error
type config struct {
BackupSources string `split_words:"true" default:"/backup"`
BackupFilename string `split_words:"true" default:"backup-%Y-%m-%dT%H-%M-%S.tar.gz"`
BackupArchive string `split_words:"true" default:"/archive"`
BackupRetentionDays int32 `split_words:"true" default:"-1"`
BackupPruningLeeway time.Duration `split_words:"true" default:"1m"`
BackupPruningPrefix string `split_words:"true"`
BackupStopContainerLabel string `split_words:"true" default:"true"`
AwsS3BucketName string `split_words:"true"`
AwsEndpoint string `split_words:"true" default:"s3.amazonaws.com"`
AwsEndpointProto string `split_words:"true" default:"https"`
AwsEndpointInsecure bool `split_words:"true"`
AwsAccessKeyID string `envconfig:"AWS_ACCESS_KEY_ID"`
AwsSecretAccessKey string `split_words:"true"`
GpgPassphrase string `split_words:"true"`
BackupSources string `split_words:"true" default:"/backup"`
BackupFilename string `split_words:"true" default:"backup-%Y-%m-%dT%H-%M-%S.tar.gz"`
BackupArchive string `split_words:"true" default:"/archive"`
BackupRetentionDays int32 `split_words:"true" default:"-1"`
BackupPruningLeeway time.Duration `split_words:"true" default:"1m"`
BackupPruningPrefix string `split_words:"true"`
BackupStopContainerLabel string `split_words:"true" default:"true"`
AwsS3BucketName string `split_words:"true"`
AwsEndpoint string `split_words:"true" default:"s3.amazonaws.com"`
AwsEndpointProto string `split_words:"true" default:"https"`
AwsEndpointInsecure bool `split_words:"true"`
AwsAccessKeyID string `envconfig:"AWS_ACCESS_KEY_ID"`
AwsSecretAccessKey string `split_words:"true"`
GpgPassphrase string `split_words:"true"`
EmailNotificationRecipient string `split_words:"true"`
EmailNotificationSender string `split_words:"true" default:"noreply@nohost"`
EmailSMTPHost string `envconfig:"EMAIL_SMTP_HOST"`
EmailSMTPPort int `envconfig:"EMAIL_SMTP_PORT" default:"587"`
EmailSMTPUsername string `envconfig:"EMAIL_SMTP_USERNAME"`
EmailSMTPPassword string `envconfig:"EMAIL_SMTP_PASSWORD"`
}
// newScript creates all resources needed for the script to perform actions against
@@ -138,6 +145,28 @@ func newScript() (*script, error) {
s.mc = mc
}
if s.c.EmailNotificationRecipient != "" {
s.errorHooks = append(s.errorHooks, func(err error, start time.Time, logOutput string) error {
mailer := gomail.NewDialer(
s.c.EmailSMTPHost, s.c.EmailSMTPPort, s.c.EmailSMTPUsername, s.c.EmailSMTPPassword,
)
subject := fmt.Sprintf(
"Failure running docker-volume-backup at %s", start.Format(time.RFC3339),
)
body := fmt.Sprintf(
"Running docker-volume-backup failed with error: %s\n\nLog output before the error occurred:\n\n%s\n", err, logOutput,
)
message := gomail.NewMessage()
message.SetHeader("From", s.c.EmailNotificationSender)
message.SetHeader("To", s.c.EmailNotificationRecipient)
message.SetHeader("Subject", subject)
message.SetBody("text/plain", body)
return mailer.DialAndSend(message)
})
}
return s, nil
}
@@ -482,7 +511,7 @@ func (s *script) must(err error) {
if err != nil {
for _, hook := range s.errorHooks {
if hookErr := hook(err, s.start, s.output.String()); hookErr != nil {
s.logger.Errorf("An error occurred calling an error hook: %s", err)
s.logger.Errorf("An error occurred calling an error hook: %s", hookErr)
}
}
s.logger.Fatalf("Fatal error running backup: %s", err)