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mandrill_sender.go
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mandrill_sender.go
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package mail
import (
"encoding/json"
"errors"
"time"
"github.com/coretrix/hitrix/pkg/entity"
"github.com/xorcare/pointer"
"github.com/latolukasz/beeorm"
"github.com/mattbaird/gochimp"
)
const (
templateCachePrefix = "mandrill_template_"
// ref: https://github.com/shawnmclean/Mandrill-dotnet/blob/05f26c917264751a903e3bcf83ca7153b5656526/src/Mandrill/Models/EmailMessage.cs#L19
mergeLanguageHandlebars = "handlebars"
mergeLanguageMailchimp = "mailchimp"
)
type Mandrill struct {
client *gochimp.MandrillAPI
defaultFromEmail string
fromName string
}
func NewMandrill(apiKey, defaultFromEmail, fromName string) *Mandrill {
mandrillAPI, err := gochimp.NewMandrill(apiKey)
if err != nil {
panic(err)
}
return &Mandrill{client: mandrillAPI, defaultFromEmail: defaultFromEmail, fromName: fromName}
}
func (s *Mandrill) SendTemplate(ormService *beeorm.Engine, message *Message) error {
return s.sendTemplate(ormService, message.From, message.To, message.Subject, message.TemplateName, message.TemplateData, nil, false)
}
func (s *Mandrill) SendTemplateAsync(ormService *beeorm.Engine, message *Message) error {
return s.sendTemplate(ormService, message.From, message.To, message.Subject, message.TemplateName, message.TemplateData, nil, true)
}
func (s *Mandrill) SendTemplateWithAttachments(ormService *beeorm.Engine, message *MessageAttachment) error {
return s.sendTemplate(ormService, message.From, message.To, message.Subject, message.TemplateName, message.TemplateData, message.Attachments, false)
}
func (s *Mandrill) SendTemplateWithAttachmentsAsync(ormService *beeorm.Engine, message *MessageAttachment) error {
return s.sendTemplate(ormService, message.From, message.To, message.Subject, message.TemplateName, message.TemplateData, message.Attachments, true)
}
func (s *Mandrill) sendTemplate(ormService *beeorm.Engine, from string, to string, subject string, templateName string, templateData interface{}, attachments []gochimp.Attachment, async bool) error {
if from == "" {
from = s.defaultFromEmail
}
message := gochimp.Message{
MergeLanguage: mergeLanguageHandlebars,
Subject: subject,
FromEmail: from,
Attachments: attachments,
To: []gochimp.Recipient{
{Email: to},
},
}
mailTrackerEntity := &entity.MailTrackerEntity{
Status: entity.MailTrackerStatusNew,
From: from,
To: to,
Subject: subject,
TemplateFile: templateName,
}
templateDataAsByte, err := json.Marshal(templateData)
if err != nil {
mailTrackerEntity.SenderError = "Cannot marshal TemplateData"
mailTrackerEntity.Status = entity.MailTrackerStatusError
ormService.Flush(mailTrackerEntity)
return err
}
mailTrackerEntity.TemplateData = string(templateDataAsByte)
var templateContent []gochimp.Var
if templateData != nil {
for key, value := range templateData.(map[string]interface{}) {
templateContent = append(templateContent, *gochimp.NewVar(key, value))
}
}
message.AddMergeVar(gochimp.MergeVars{Recipient: to, Vars: templateContent})
responses, err := s.client.MessageSendTemplate(templateName, templateContent, message, async)
if err != nil {
mailTrackerEntity.SenderError = err.Error()
mailTrackerEntity.Status = entity.MailTrackerStatusError
ormService.Flush(mailTrackerEntity)
return err
}
if responses != nil {
for _, response := range responses {
if response.RejectedReason != "" {
mailTrackerEntity.SenderError += response.RejectedReason + " | "
}
}
if mailTrackerEntity.SenderError != "" {
mailTrackerEntity.Status = entity.MailTrackerStatusError
ormService.Flush(mailTrackerEntity)
return errors.New(mailTrackerEntity.SenderError)
}
}
if async {
mailTrackerEntity.Status = entity.MailTrackerStatusQueued
} else {
mailTrackerEntity.Status = entity.MailTrackerStatusSuccess
}
mailTrackerEntity.SentAt = pointer.Time(time.Now())
ormService.Flush(mailTrackerEntity)
return nil
}
func (s *Mandrill) GetTemplateHTMLCode(ormService *beeorm.Engine, templateName string, ttl int) (string, error) {
key := templateCachePrefix + templateName
redisCache := ormService.GetRedis()
htmlCode, has := redisCache.Get(key)
if has {
return htmlCode, nil
}
template, err := s.client.TemplateInfo(templateName)
if err != nil {
return "", err
}
redisCache.Set(key, template.Code, ttl)
return template.Code, nil
}