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// Copyright (c) 2016 Mattermost, Inc. All Rights Reserved.
// See License.txt for license information.
package app
import (
"database/sql"
"fmt"
"html/template"
"strconv"
"time"
"github.com/mattermost/platform/model"
"github.com/mattermost/platform/utils"
l4g "github.com/alecthomas/log4go"
"github.com/nicksnyder/go-i18n/i18n"
)
const (
EMAIL_BATCHING_TASK_NAME = "Email Batching"
)
var emailBatchingJob *EmailBatchingJob
func InitEmailBatching() {
if *utils.Cfg.EmailSettings.EnableEmailBatching {
if emailBatchingJob == nil {
emailBatchingJob = MakeEmailBatchingJob(*utils.Cfg.EmailSettings.EmailBatchingBufferSize)
}
// note that we don't support changing EmailBatchingBufferSize without restarting the server
emailBatchingJob.Start()
}
}
func AddNotificationEmailToBatch(user *model.User, post *model.Post, team *model.Team) *model.AppError {
if !*utils.Cfg.EmailSettings.EnableEmailBatching {
return model.NewLocAppError("AddNotificationEmailToBatch", "api.email_batching.add_notification_email_to_batch.disabled.app_error", nil, "")
}
if !emailBatchingJob.Add(user, post, team) {
l4g.Error(utils.T("api.email_batching.add_notification_email_to_batch.channel_full.app_error"))
return model.NewLocAppError("AddNotificationEmailToBatch", "api.email_batching.add_notification_email_to_batch.channel_full.app_error", nil, "")
}
return nil
}
type batchedNotification struct {
userId string
post *model.Post
teamName string
}
type EmailBatchingJob struct {
newNotifications chan *batchedNotification
pendingNotifications map[string][]*batchedNotification
}
func MakeEmailBatchingJob(bufferSize int) *EmailBatchingJob {
return &EmailBatchingJob{
newNotifications: make(chan *batchedNotification, bufferSize),
pendingNotifications: make(map[string][]*batchedNotification),
}
}
func (job *EmailBatchingJob) Start() {
if task := model.GetTaskByName(EMAIL_BATCHING_TASK_NAME); task != nil {
task.Cancel()
}
l4g.Debug(utils.T("api.email_batching.start.starting"), *utils.Cfg.EmailSettings.EmailBatchingInterval)
model.CreateRecurringTask(EMAIL_BATCHING_TASK_NAME, job.CheckPendingEmails, time.Duration(*utils.Cfg.EmailSettings.EmailBatchingInterval)*time.Second)
}
func (job *EmailBatchingJob) Add(user *model.User, post *model.Post, team *model.Team) bool {
notification := &batchedNotification{
userId: user.Id,
post: post,
teamName: team.Name,
}
select {
case job.newNotifications <- notification:
return true
default:
// return false if we couldn't queue the email notification so that we can send an immediate email
return false
}
}
func (job *EmailBatchingJob) CheckPendingEmails() {
job.handleNewNotifications()
// it's a bit weird to pass the send email function through here, but it makes it so that we can test
// without actually sending emails
job.checkPendingNotifications(time.Now(), sendBatchedEmailNotification)
l4g.Debug(utils.T("api.email_batching.check_pending_emails.finished_running"), len(job.pendingNotifications))
}
func (job *EmailBatchingJob) handleNewNotifications() {
receiving := true
// read in new notifications to send
for receiving {
select {
case notification := <-job.newNotifications:
userId := notification.userId
if _, ok := job.pendingNotifications[userId]; !ok {
job.pendingNotifications[userId] = []*batchedNotification{notification}
} else {
job.pendingNotifications[userId] = append(job.pendingNotifications[userId], notification)
}
default:
receiving = false
}
}
}
func (job *EmailBatchingJob) checkPendingNotifications(now time.Time, handler func(string, []*batchedNotification)) {
// look for users who've acted since pending posts were received
for userId, notifications := range job.pendingNotifications {
schan := Srv.Store.Status().Get(userId)
pchan := Srv.Store.Preference().Get(userId, model.PREFERENCE_CATEGORY_NOTIFICATIONS, model.PREFERENCE_NAME_EMAIL_INTERVAL)
batchStartTime := notifications[0].post.CreateAt
// check if the user has been active and would've seen any new posts
if result := <-schan; result.Err != nil {
l4g.Error(utils.T("api.email_batching.check_pending_emails.status.app_error"), result.Err)
delete(job.pendingNotifications, userId)
continue
} else if status := result.Data.(*model.Status); status.LastActivityAt >= batchStartTime {
delete(job.pendingNotifications, userId)
continue
}
// get how long we need to wait to send notifications to the user
var interval int64
if result := <-pchan; result.Err != nil {
// default to 30 seconds to match the send "immediate" setting
interval, _ = strconv.ParseInt(model.PREFERENCE_DEFAULT_EMAIL_INTERVAL, 10, 64)
} else {
preference := result.Data.(model.Preference)
if value, err := strconv.ParseInt(preference.Value, 10, 64); err != nil {
interval, _ = strconv.ParseInt(model.PREFERENCE_DEFAULT_EMAIL_INTERVAL, 10, 64)
} else {
interval = value
}
}
// send the email notification if it's been long enough
if now.Sub(time.Unix(batchStartTime/1000, 0)) > time.Duration(interval)*time.Second {
go handler(userId, notifications)
delete(job.pendingNotifications, userId)
}
}
}
func sendBatchedEmailNotification(userId string, notifications []*batchedNotification) {
uchan := Srv.Store.User().Get(userId)
pchan := Srv.Store.Preference().Get(userId, model.PREFERENCE_CATEGORY_DISPLAY_SETTINGS, model.PREFERENCE_NAME_DISPLAY_NAME_FORMAT)
var user *model.User
if result := <-uchan; result.Err != nil {
l4g.Warn("api.email_batching.send_batched_email_notification.user.app_error")
return
} else {
user = result.Data.(*model.User)
}
translateFunc := utils.GetUserTranslations(user.Locale)
var displayNameFormat string
if result := <-pchan; result.Err != nil && result.Err.DetailedError != sql.ErrNoRows.Error() {
l4g.Warn("api.email_batching.send_batched_email_notification.preferences.app_error")
return
} else if result.Err != nil {
// no display name format saved, so fall back to default
displayNameFormat = model.PREFERENCE_DEFAULT_DISPLAY_NAME_FORMAT
} else {
displayNameFormat = result.Data.(model.Preference).Value
}
var contents string
for _, notification := range notifications {
template := utils.NewHTMLTemplate("post_batched_post", user.Locale)
contents += renderBatchedPost(template, notification.post, notification.teamName, displayNameFormat, translateFunc)
}
tm := time.Unix(notifications[0].post.CreateAt/1000, 0)
subject := translateFunc("api.email_batching.send_batched_email_notification.subject", len(notifications), map[string]interface{}{
"SiteName": utils.Cfg.TeamSettings.SiteName,
"Year": tm.Year(),
"Month": translateFunc(tm.Month().String()),
"Day": tm.Day(),
})
body := utils.NewHTMLTemplate("post_batched_body", user.Locale)
body.Props["SiteURL"] = *utils.Cfg.ServiceSettings.SiteURL
body.Props["Posts"] = template.HTML(contents)
body.Props["BodyText"] = translateFunc("api.email_batching.send_batched_email_notification.body_text", len(notifications))
if err := utils.SendMail(user.Email, subject, body.Render()); err != nil {
l4g.Warn(utils.T("api.email_batchings.send_batched_email_notification.send.app_error"), user.Email, err)
}
}
func renderBatchedPost(template *utils.HTMLTemplate, post *model.Post, teamName string, displayNameFormat string, translateFunc i18n.TranslateFunc) string {
schan := Srv.Store.User().Get(post.UserId)
cchan := Srv.Store.Channel().Get(post.ChannelId, true)
template.Props["Button"] = translateFunc("api.email_batching.render_batched_post.go_to_post")
template.Props["PostMessage"] = GetMessageForNotification(post, translateFunc)
template.Props["PostLink"] = *utils.Cfg.ServiceSettings.SiteURL + "/" + teamName + "/pl/" + post.Id
tm := time.Unix(post.CreateAt/1000, 0)
timezone, _ := tm.Zone()
template.Props["Date"] = translateFunc("api.email_batching.render_batched_post.date", map[string]interface{}{
"Year": tm.Year(),
"Month": translateFunc(tm.Month().String()),
"Day": tm.Day(),
"Hour": tm.Hour(),
"Minute": fmt.Sprintf("%02d", tm.Minute()),
"Timezone": timezone,
})
if result := <-schan; result.Err != nil {
l4g.Warn(utils.T("api.email_batching.render_batched_post.sender.app_error"))
return ""
} else {
template.Props["SenderName"] = result.Data.(*model.User).GetDisplayNameForPreference(displayNameFormat)
}
if result := <-cchan; result.Err != nil {
l4g.Warn(utils.T("api.email_batching.render_batched_post.channel.app_error"))
return ""
} else if channel := result.Data.(*model.Channel); channel.Type == model.CHANNEL_DIRECT {
template.Props["ChannelName"] = translateFunc("api.email_batching.render_batched_post.direct_message")
} else {
template.Props["ChannelName"] = channel.DisplayName
}
return template.Render()
}
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