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smtp: only construct email once

also switch layout in email file to group each driver and its methods
together.
This commit is contained in:
Harvey Tindall 2021-10-07 16:14:32 +01:00
parent 5ff3839239
commit 77799b2917
Signed by: hrfee
GPG Key ID: BBC65952848FB1A2

159
email.go
View File

@ -13,7 +13,6 @@ import (
"os"
"strconv"
"strings"
"sync"
textTemplate "text/template"
"time"
@ -31,84 +30,6 @@ type EmailClient interface {
Send(fromName, fromAddr string, message *Message, address ...string) error
}
type DummyClient struct{}
func (dc *DummyClient) Send(fromName, fromAddr string, email *Message, address ...string) error {
fmt.Printf("FROM: %s <%s>\nTO: %s\nTEXT: %s\n", fromName, fromAddr, strings.Join(address, ", "), email.Text)
return nil
}
// Mailgun client implements EmailClient.
type Mailgun struct {
client *mailgun.MailgunImpl
}
func (mg *Mailgun) Send(fromName, fromAddr string, email *Message, address ...string) error {
message := mg.client.NewMessage(
fmt.Sprintf("%s <%s>", fromName, fromAddr),
email.Subject,
email.Text,
)
for _, a := range address {
// Adding variable tells mailgun to do a batch send, so users don't see other recipients.
message.AddRecipientAndVariables(a, map[string]interface{}{"unique_id": a})
}
message.SetHtml(email.HTML)
ctx, cancel := context.WithTimeout(context.Background(), time.Second*10)
defer cancel()
_, _, err := mg.client.Send(ctx, message)
return err
}
// SMTP supports SSL/TLS and STARTTLS; implements EmailClient.
type SMTP struct {
Client *sMail.SMTPServer
}
func (sm *SMTP) Send(fromName, fromAddr string, email *Message, address ...string) error {
from := fmt.Sprintf("%s <%s>", fromName, fromAddr)
var cli *sMail.SMTPClient
var err error
cli, err = sm.Client.Connect()
if err != nil {
return err
}
defer cli.Close()
var wg sync.WaitGroup
for _, addr := range address {
wg.Add(1)
go func(addr string) {
defer wg.Done()
e := sMail.NewMSG()
e.SetFrom(from)
e.SetSubject(email.Subject)
e.AddTo(addr)
if email.HTML == "" {
e.SetBody(sMail.TextPlain, email.Text)
} else {
e.SetBody(sMail.TextHTML, email.HTML)
e.AddAlternative(sMail.TextPlain, email.Text)
}
err = e.Send(cli)
// e := jEmail.NewEmail()
// e.Subject = email.Subject
// e.From = from
// e.Text = []byte(email.Text)
// e.HTML = []byte(email.HTML)
// e.To = []string{addr}
// err = sm.Pool.Send(e, 15*time.Second)
// if sm.sslTLS {
// err = sm.Pool.S
// err = e.SendWithTLS(server, sm.auth, sm.tlsConfig)
// } else {
// err = e.SendWithStartTLS(server, sm.auth, sm.tlsConfig)
// }
}(addr)
}
wg.Wait()
return err
}
// Emailer contains the email sender, translations, and methods to construct messages.
type Emailer struct {
fromAddr, fromName string
@ -175,18 +96,17 @@ func NewEmailer(app *appContext) *Emailer {
return emailer
}
// NewMailgun returns a Mailgun emailClient.
func (emailer *Emailer) NewMailgun(url, key string) {
sender := &Mailgun{
client: mailgun.NewMailgun(strings.Split(emailer.fromAddr, "@")[1], key),
// DummyClient just logs the email to the console for debugging purposes. It can be used by settings [email]/method to "dummy".
type DummyClient struct{}
func (dc *DummyClient) Send(fromName, fromAddr string, email *Message, address ...string) error {
fmt.Printf("FROM: %s <%s>\nTO: %s\nTEXT: %s\n", fromName, fromAddr, strings.Join(address, ", "), email.Text)
return nil
}
// Mailgun client takes the base url, so we need to trim off the end (e.g 'v3/messages')
if strings.Contains(url, "messages") {
url = url[0:strings.LastIndex(url, "/")]
url = url[0:strings.LastIndex(url, "/")]
}
sender.client.SetAPIBase(url)
emailer.sender = sender
// SMTP supports SSL/TLS and STARTTLS; implements EmailClient.
type SMTP struct {
Client *sMail.SMTPServer
}
// NewSMTP returns an SMTP emailClient.
@ -237,6 +157,65 @@ func (emailer *Emailer) NewSMTP(server string, port int, username, password stri
return
}
func (sm *SMTP) Send(fromName, fromAddr string, email *Message, address ...string) error {
from := fmt.Sprintf("%s <%s>", fromName, fromAddr)
var cli *sMail.SMTPClient
var err error
cli, err = sm.Client.Connect()
if err != nil {
return err
}
defer cli.Close()
e := sMail.NewMSG()
e.SetFrom(from)
e.SetSubject(email.Subject)
e.AddTo(address...)
if email.HTML == "" {
e.SetBody(sMail.TextPlain, email.Text)
} else {
e.SetBody(sMail.TextHTML, email.HTML)
e.AddAlternative(sMail.TextPlain, email.Text)
}
err = e.Send(cli)
return err
}
// Mailgun client implements EmailClient.
type Mailgun struct {
client *mailgun.MailgunImpl
}
// NewMailgun returns a Mailgun emailClient.
func (emailer *Emailer) NewMailgun(url, key string) {
sender := &Mailgun{
client: mailgun.NewMailgun(strings.Split(emailer.fromAddr, "@")[1], key),
}
// Mailgun client takes the base url, so we need to trim off the end (e.g 'v3/messages')
if strings.Contains(url, "messages") {
url = url[0:strings.LastIndex(url, "/")]
url = url[0:strings.LastIndex(url, "/")]
}
sender.client.SetAPIBase(url)
emailer.sender = sender
}
func (mg *Mailgun) Send(fromName, fromAddr string, email *Message, address ...string) error {
message := mg.client.NewMessage(
fmt.Sprintf("%s <%s>", fromName, fromAddr),
email.Subject,
email.Text,
)
for _, a := range address {
// Adding variable tells mailgun to do a batch send, so users don't see other recipients.
message.AddRecipientAndVariables(a, map[string]interface{}{"unique_id": a})
}
message.SetHtml(email.HTML)
ctx, cancel := context.WithTimeout(context.Background(), time.Second*10)
defer cancel()
_, _, err := mg.client.Send(ctx, message)
return err
}
type templ interface {
Execute(wr io.Writer, data interface{}) error
}