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refactor(notifier): improve smtp errors (#3646)

pull/3678/head
James Elliott 2022-07-09 12:40:02 +10:00 committed by GitHub
parent 394dafde01
commit c9cfc8afa9
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 39 additions and 33 deletions
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72
internal/notification/smtp_notifier.go
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@ -5,6 +5,7 @@ import (
"crypto/x509"
"errors"
"fmt"
"io"
"net"
"net/smtp"
"strings"
@ -185,14 +186,17 @@ func (n *SMTPNotifier) dial() (err error) {
n.log.Infof("Notifier SMTP client using submissions port 465. Make sure the mail server you are connecting to is configured for submissions and not SMTPS.")
conn, err = tls.DialWithDialer(dialer, "tcp", fmt.Sprintf("%s:%d", n.configuration.Host, n.configuration.Port), n.tlsConfig)
if err != nil {
return err
}
} else {
conn, err = dialer.Dial("tcp", fmt.Sprintf("%s:%d", n.configuration.Host, n.configuration.Port))
if err != nil {
return err
}
}
switch {
case err == nil:
break
case errors.Is(err, io.EOF):
return fmt.Errorf("received %w error: this error often occurs due to network errors such as a firewall, network policies, or closed ports which may be due to smtp service not running or an incorrect port specified in configuration", err)
default:
return err
}
client, err = smtp.NewClient(conn, n.configuration.Host)
@ -217,30 +221,30 @@ func (n *SMTPNotifier) cleanup() {
// StartupCheck implements the startup check provider interface.
func (n *SMTPNotifier) StartupCheck() (err error) {
if err := n.dial(); err != nil {
return err
if err = n.dial(); err != nil {
return fmt.Errorf("error dialing the smtp server: %w", err)
}
defer n.cleanup()
if err := n.client.Hello(n.configuration.Identifier); err != nil {
return err
if err = n.client.Hello(n.configuration.Identifier); err != nil {
return fmt.Errorf("error performing HELO/EHLO with the smtp server: %w", err)
}
if err := n.startTLS(); err != nil {
return err
if err = n.startTLS(); err != nil {
return fmt.Errorf("error performing STARTTLS with the smtp server: %w", err)
}
if err := n.auth(); err != nil {
return err
if err = n.auth(); err != nil {
return fmt.Errorf("error performing AUTH with the smtp server: %w", err)
}
if err := n.client.Mail(n.configuration.Sender.Address); err != nil {
return err
if err = n.client.Mail(n.configuration.Sender.Address); err != nil {
return fmt.Errorf("error performing MAIL FROM with the smtp server: %w", err)
}
if err := n.client.Rcpt(n.configuration.StartupCheckAddress); err != nil {
return err
if err = n.client.Rcpt(n.configuration.StartupCheckAddress); err != nil {
return fmt.Errorf("error performing RCPT with the smtp server: %w", err)
}
return n.client.Reset()
@ -250,39 +254,41 @@ func (n *SMTPNotifier) StartupCheck() (err error) {
func (n *SMTPNotifier) Send(recipient, title, body, htmlBody string) error {
subject := strings.ReplaceAll(n.configuration.Subject, "{title}", title)
if err := n.dial(); err != nil {
return err
var err error
if err = n.dial(); err != nil {
return fmt.Errorf("error dialing the smtp server: %w", err)
}
// Always execute QUIT at the end once we're connected.
defer n.cleanup()
if err := n.client.Hello(n.configuration.Identifier); err != nil {
return err
if err = n.client.Hello(n.configuration.Identifier); err != nil {
return fmt.Errorf("error performing HELO/EHLO with the smtp server: %w", err)
}
// Start TLS and then Authenticate.
if err := n.startTLS(); err != nil {
return err
if err = n.startTLS(); err != nil {
return fmt.Errorf("error performing STARTTLS with the smtp server: %w", err)
}
if err := n.auth(); err != nil {
return err
if err = n.auth(); err != nil {
return fmt.Errorf("error performing AUTH with the smtp server: %w", err)
}
// Set the sender and recipient first.
if err := n.client.Mail(n.configuration.Sender.Address); err != nil {
if err = n.client.Mail(n.configuration.Sender.Address); err != nil {
n.log.Debugf("Notifier SMTP failed while sending MAIL FROM (using sender) with error: %s", err)
return err
return fmt.Errorf("error performing MAIL FROM with the smtp server: %w", err)
}
if err := n.client.Rcpt(recipient); err != nil {
if err = n.client.Rcpt(n.configuration.StartupCheckAddress); err != nil {
n.log.Debugf("Notifier SMTP failed while sending RCPT TO (using recipient) with error: %s", err)
return err
return fmt.Errorf("error performing RCPT with the smtp server: %w", err)
}
// Compose and send the email body to the server.
if err := n.compose(recipient, subject, body, htmlBody); err != nil {
if err = n.compose(recipient, subject, body, htmlBody); err != nil {
return err
}