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allow registering hooks at different levels

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This commit is contained in:
Frederik Ring 2021-09-09 12:05:57 +02:00
parent 59660ec5c7
commit 160a47e90b
1 changed files with 39 additions and 13 deletions
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52
cmd/backup/main.go
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@ -60,10 +60,10 @@ func main() {
// script holds all the stateful information required to orchestrate a // script holds all the stateful information required to orchestrate a
// single backup run. // single backup run.
type script struct { type script struct {
cli *client.Client cli *client.Client
mc *minio.Client mc *minio.Client
logger *logrus.Logger logger *logrus.Logger
errorHooks []errorHook hooks []hook
start time.Time start time.Time
file string file string
@ -72,8 +72,6 @@ type script struct {
c *config c *config
} }
type errorHook func(err error, start time.Time, logOutput string) error
type config struct { type config struct {
BackupSources string `split_words:"true" default:"/backup"` BackupSources string `split_words:"true" default:"/backup"`
BackupFilename string `split_words:"true" default:"backup-%Y-%m-%dT%H-%M-%S.tar.gz"` BackupFilename string `split_words:"true" default:"backup-%Y-%m-%dT%H-%M-%S.tar.gz"`
@ -146,7 +144,7 @@ func newScript() (*script, error) {
} }
if s.c.EmailNotificationRecipient != "" { if s.c.EmailNotificationRecipient != "" {
s.errorHooks = append(s.errorHooks, func(err error, start time.Time, logOutput string) error { s.hooks = append(s.hooks, hook{hookLevelFailure, func(err error, start time.Time, logOutput string) error {
mailer := gomail.NewDialer( mailer := gomail.NewDialer(
s.c.EmailSMTPHost, s.c.EmailSMTPPort, s.c.EmailSMTPUsername, s.c.EmailSMTPPassword, s.c.EmailSMTPHost, s.c.EmailSMTPPort, s.c.EmailSMTPUsername, s.c.EmailSMTPPassword,
) )
@ -164,7 +162,7 @@ func newScript() (*script, error) {
message.SetHeader("Subject", subject) message.SetHeader("Subject", subject)
message.SetBody("text/plain", body) message.SetBody("text/plain", body)
return mailer.DialAndSend(message) return mailer.DialAndSend(message)
}) }})
} }
return s, nil return s, nil
@ -504,16 +502,33 @@ func (s *script) pruneOldBackups() error {
return nil return nil
} }
// runHooks runs all hooks that have been registered using the
// given level. In case executing a hook returns an error, the following
// hooks will still be run before the function returns an error.
func (s *script) runHooks(err error, targetLevel string) error {
var actionErrors []error
for _, hook := range s.hooks {
if hook.level != targetLevel {
continue
}
if err := hook.action(err, s.start, s.output.String()); err != nil {
actionErrors = append(actionErrors, err)
}
}
if len(actionErrors) != 0 {
return join(actionErrors...)
}
return nil
}
// must exits the script run non-zero and prematurely in case the given error // must exits the script run non-zero and prematurely in case the given error
// is non-nil. If error hooks are present on the script object, they // is non-nil. If failure hooks have been registered on the script object, they
// will be called, passing the failure and previous log output. // will be called, passing the failure and previous log output.
func (s *script) must(err error) { func (s *script) must(err error) {
if err != nil { if err != nil {
s.logger.Errorf("Fatal error running backup: %s", err) s.logger.Errorf("Fatal error running backup: %s", err)
for _, hook := range s.errorHooks { if hookErr := s.runHooks(err, hookLevelFailure); hookErr != nil {
if hookErr := hook(err, s.start, s.output.String()); hookErr != nil { s.logger.Errorf("An error occurred calling the registered failure hooks: %s", hookErr)
s.logger.Errorf("An error occurred calling an error hook: %s", hookErr)
}
} }
os.Exit(1) os.Exit(1)
} }
@ -588,3 +603,14 @@ func (b *bufferingWriter) Write(p []byte) (n int, err error) {
} }
return b.writer.Write(p) return b.writer.Write(p)
} }
// hook contains a queued action that can be trigger them when the script
// reaches a certain point (e.g. unsuccessful backup)
type hook struct {
level string
action func(err error, start time.Time, logOutput string) error
}
const (
hookLevelFailure = "failure"
)