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

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James Elliott 2022-07-09 12:40:02 +10:00 committed by GitHub
parent 394dafde01
commit c9cfc8afa9
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1 changed files with 39 additions and 33 deletions
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70
internal/notification/smtp_notifier.go
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@ -5,6 +5,7 @@ import (
"crypto/x509" "crypto/x509"
"errors" "errors"
"fmt" "fmt"
"io"
"net" "net"
"net/smtp" "net/smtp"
"strings" "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.") 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) conn, err = tls.DialWithDialer(dialer, "tcp", fmt.Sprintf("%s:%d", n.configuration.Host, n.configuration.Port), n.tlsConfig)
if err != nil {
return err
}
} else { } else {
conn, err = dialer.Dial("tcp", fmt.Sprintf("%s:%d", n.configuration.Host, n.configuration.Port)) 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) client, err = smtp.NewClient(conn, n.configuration.Host)
@ -217,30 +221,30 @@ func (n *SMTPNotifier) cleanup() {
// StartupCheck implements the startup check provider interface. // StartupCheck implements the startup check provider interface.
func (n *SMTPNotifier) StartupCheck() (err error) { func (n *SMTPNotifier) StartupCheck() (err error) {
if err := n.dial(); err != nil { if err = n.dial(); err != nil {
return err return fmt.Errorf("error dialing the smtp server: %w", err)
} }
defer n.cleanup() defer n.cleanup()
if err := n.client.Hello(n.configuration.Identifier); err != nil { if err = n.client.Hello(n.configuration.Identifier); err != nil {
return err return fmt.Errorf("error performing HELO/EHLO with the smtp server: %w", err)
} }
if err := n.startTLS(); err != nil { if err = n.startTLS(); err != nil {
return err return fmt.Errorf("error performing STARTTLS with the smtp server: %w", err)
} }
if err := n.auth(); err != nil { if err = n.auth(); err != nil {
return err return fmt.Errorf("error performing AUTH with the smtp server: %w", err)
} }
if err := n.client.Mail(n.configuration.Sender.Address); err != nil { if err = n.client.Mail(n.configuration.Sender.Address); err != nil {
return err return fmt.Errorf("error performing MAIL FROM with the smtp server: %w", err)
} }
if err := n.client.Rcpt(n.configuration.StartupCheckAddress); err != nil { if err = n.client.Rcpt(n.configuration.StartupCheckAddress); err != nil {
return err return fmt.Errorf("error performing RCPT with the smtp server: %w", err)
} }
return n.client.Reset() return n.client.Reset()
@ -250,39 +254,41 @@ func (n *SMTPNotifier) StartupCheck() (err error) {
func (n *SMTPNotifier) Send(recipient, title, body, htmlBody string) error { func (n *SMTPNotifier) Send(recipient, title, body, htmlBody string) error {
subject := strings.ReplaceAll(n.configuration.Subject, "{title}", title) subject := strings.ReplaceAll(n.configuration.Subject, "{title}", title)
if err := n.dial(); err != nil { var err error
return err
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. // Always execute QUIT at the end once we're connected.
defer n.cleanup() defer n.cleanup()
if err := n.client.Hello(n.configuration.Identifier); err != nil { if err = n.client.Hello(n.configuration.Identifier); err != nil {
return err return fmt.Errorf("error performing HELO/EHLO with the smtp server: %w", err)
} }
// Start TLS and then Authenticate. if err = n.startTLS(); err != nil {
if err := n.startTLS(); err != nil { return fmt.Errorf("error performing STARTTLS with the smtp server: %w", err)
return err
} }
if err := n.auth(); err != nil { if err = n.auth(); err != nil {
return err 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) 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) 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. // 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 return err
} }