122 lines
2.4 KiB
Go
122 lines
2.4 KiB
Go
package services
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import (
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"errors"
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"log"
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"time"
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"github.com/go-mail/mail"
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)
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var (
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ErrMailUninitializedConfig = errors.New("Mail: uninitialized config")
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)
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type EmailConfig struct {
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From string
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SMTPEnabled bool
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SMTPServer string
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SMTPPort int
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SMTPUsername string
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SMTPPassword string
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SMTPTimeout time.Duration
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}
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type Email struct {
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config *EmailConfig
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mailChan chan *mail.Message
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}
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func NewEmail(conf *EmailConfig) *Email {
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if conf == nil {
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log.Println(ErrMailUninitializedConfig)
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}
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return &Email{
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config: conf,
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mailChan: make(chan *mail.Message, 4),
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}
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}
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// Send sends an email to the receiver
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func (email *Email) Send(to, subject, text, html string) error {
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if email.config == nil {
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log.Print("Error: trying to send mail with uninitialized config.")
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return ErrMailUninitializedConfig
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}
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if !email.config.SMTPEnabled {
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log.Printf("SMTP is disabled in config, printing out email text instead:\nTo: %s\n%s", to, text)
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}
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m := mail.NewMessage()
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m.SetHeader("From", email.config.From)
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m.SetHeader("To", to)
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m.SetHeader("Subject", subject)
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m.SetBody("text/plain", text)
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if len(html) > 0 {
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m.AddAlternative("text/html", html)
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}
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// put email in chan
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email.mailChan <- m
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return nil
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}
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// Daemon is a function that takes Mail and sends it without blocking.
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// WIP
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func (email *Email) Daemon() {
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if email.config == nil {
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log.Print("Error: trying to set up mail deamon with uninitialized config.")
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return
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}
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if !email.config.SMTPEnabled {
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log.Print("SMTP is disabled in config, emails will be printed instead.")
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return
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}
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log.Print("Running mail sending routine")
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d := mail.NewDialer(
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email.config.SMTPServer,
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email.config.SMTPPort,
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email.config.SMTPUsername,
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email.config.SMTPPassword)
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var s mail.SendCloser
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var err error
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open := false
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for {
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select {
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case m, ok := <-email.mailChan:
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if !ok {
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// channel is closed
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log.Print("Channel closed")
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return
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}
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if !open {
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if s, err = d.Dial(); err != nil {
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log.Print(err)
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return
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}
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open = true
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}
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log.Printf("Trying to send mail")
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if err := mail.Send(s, m); err != nil {
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log.Printf("Mail: %s", err)
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}
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// Close the connection if no email was sent in the last X seconds.
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case <-time.After(email.config.SMTPTimeout):
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if open {
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if err := s.Close(); err != nil {
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log.Printf("Mail: Failed to close connection: %s", err)
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}
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open = false
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}
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}
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}
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}
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