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// Copyright (c) 2016-present Mattermost, Inc. All Rights Reserved.
// See License.txt for license information.
package app
import (
"fmt"
"html/template"
"strconv"
"time"
"github.com/mattermost/mattermost-server/model"
"github.com/mattermost/mattermost-server/utils"
"net/http"
l4g "github.com/alecthomas/log4go"
"github.com/nicksnyder/go-i18n/i18n"
)
const (
EMAIL_BATCHING_TASK_NAME = "Email Batching"
)
func (a *App) InitEmailBatching() {
if *a.Config().EmailSettings.EnableEmailBatching {
if a.EmailBatching == nil {
a.EmailBatching = NewEmailBatchingJob(a, *a.Config().EmailSettings.EmailBatchingBufferSize)
}
// note that we don't support changing EmailBatchingBufferSize without restarting the server
a.EmailBatching.Start()
}
}
func (a *App) AddNotificationEmailToBatch(user *model.User, post *model.Post, team *model.Team) *model.AppError {
if !*a.Config().EmailSettings.EnableEmailBatching {
return model.NewAppError("AddNotificationEmailToBatch", "api.email_batching.add_notification_email_to_batch.disabled.app_error", nil, "", http.StatusNotImplemented)
}
if !a.EmailBatching.Add(user, post, team) {
l4g.Error(utils.T("api.email_batching.add_notification_email_to_batch.channel_full.app_error"))
return model.NewAppError("AddNotificationEmailToBatch", "api.email_batching.add_notification_email_to_batch.channel_full.app_error", nil, "", http.StatusInternalServerError)
}
return nil
}
type batchedNotification struct {
userId string
post *model.Post
teamName string
}
type EmailBatchingJob struct {
app *App
newNotifications chan *batchedNotification
pendingNotifications map[string][]*batchedNotification
}
func NewEmailBatchingJob(a *App, bufferSize int) *EmailBatchingJob {
return &EmailBatchingJob{
app: a,
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"), *job.app.Config().EmailSettings.EmailBatchingInterval)
model.CreateRecurringTask(EMAIL_BATCHING_TASK_NAME, job.CheckPendingEmails, time.Duration(*job.app.Config().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(), job.app.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)) {
for userId, notifications := range job.pendingNotifications {
batchStartTime := notifications[0].post.CreateAt
inspectedTeamNames := make(map[string]string)
for _, notification := range notifications {
// at most, we'll do one check for each team that notifications were sent for
if inspectedTeamNames[notification.teamName] != "" {
continue
}
tchan := job.app.Srv.Store.Team().GetByName(notifications[0].teamName)
if result := <-tchan; result.Err != nil {
l4g.Error("Unable to find Team id for notification", result.Err)
continue
} else if team, ok := result.Data.(*model.Team); ok {
inspectedTeamNames[notification.teamName] = team.Id
}
// if the user has viewed any channels in this team since the notification was queued, delete
// all queued notifications
mchan := job.app.Srv.Store.Channel().GetMembersForUser(inspectedTeamNames[notification.teamName], userId)
if result := <-mchan; result.Err != nil {
l4g.Error("Unable to find ChannelMembers for user", result.Err)
continue
} else if channelMembers, ok := result.Data.(*model.ChannelMembers); ok {
for _, channelMember := range *channelMembers {
if channelMember.LastViewedAt >= batchStartTime {
l4g.Debug("Deleted notifications for user %s", userId)
delete(job.pendingNotifications, userId)
break
}
}
}
}
// get how long we need to wait to send notifications to the user
var interval int64
pchan := job.app.Srv.Store.Preference().Get(userId, model.PREFERENCE_CATEGORY_NOTIFICATIONS, model.PREFERENCE_NAME_EMAIL_INTERVAL)
if result := <-pchan; result.Err != nil {
// use the default batching interval if an error ocurrs while fetching user preferences
interval, _ = strconv.ParseInt(model.PREFERENCE_EMAIL_INTERVAL_BATCHING_SECONDS, 10, 64)
} else {
preference := result.Data.(model.Preference)
if value, err := strconv.ParseInt(preference.Value, 10, 64); err != nil {
// // use the default batching interval if an error ocurrs while deserializing user preferences
interval, _ = strconv.ParseInt(model.PREFERENCE_EMAIL_INTERVAL_BATCHING_SECONDS, 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 {
job.app.Go(func(userId string, notifications []*batchedNotification) func() {
return func() {
handler(userId, notifications)
}
}(userId, notifications))
delete(job.pendingNotifications, userId)
}
}
}
func (a *App) sendBatchedEmailNotification(userId string, notifications []*batchedNotification) {
uchan := a.Srv.Store.User().Get(userId)
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)
displayNameFormat := *a.Config().TeamSettings.TeammateNameDisplay
var contents string
for _, notification := range notifications {
var sender *model.User
schan := a.Srv.Store.User().Get(notification.post.UserId)
if result := <-schan; result.Err != nil {
l4g.Warn(utils.T("api.email_batching.render_batched_post.sender.app_error"))
continue
} else {
sender = result.Data.(*model.User)
}
var channel *model.Channel
cchan := a.Srv.Store.Channel().Get(notification.post.ChannelId, true)
if result := <-cchan; result.Err != nil {
l4g.Warn(utils.T("api.email_batching.render_batched_post.channel.app_error"))
continue
} else {
channel = result.Data.(*model.Channel)
}
emailNotificationContentsType := model.EMAIL_NOTIFICATION_CONTENTS_FULL
if utils.IsLicensed() && *utils.License().Features.EmailNotificationContents {
emailNotificationContentsType = *a.Config().EmailSettings.EmailNotificationContentsType
}
contents += a.renderBatchedPost(notification, channel, sender, *a.Config().ServiceSettings.SiteURL, displayNameFormat, translateFunc, user.Locale, emailNotificationContentsType)
}
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": a.Config().TeamSettings.SiteName,
"Year": tm.Year(),
"Month": translateFunc(tm.Month().String()),
"Day": tm.Day(),
})
body := a.NewEmailTemplate("post_batched_body", user.Locale)
body.Props["SiteURL"] = *a.Config().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 := a.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 (a *App) renderBatchedPost(notification *batchedNotification, channel *model.Channel, sender *model.User, siteURL string, displayNameFormat string, translateFunc i18n.TranslateFunc, userLocale string, emailNotificationContentsType string) string {
// don't include message contents if email notification contents type is set to generic
var template *utils.HTMLTemplate
if emailNotificationContentsType == model.EMAIL_NOTIFICATION_CONTENTS_FULL {
template = a.NewEmailTemplate("post_batched_post_full", userLocale)
} else {
template = a.NewEmailTemplate("post_batched_post_generic", userLocale)
}
template.Props["Button"] = translateFunc("api.email_batching.render_batched_post.go_to_post")
template.Props["PostMessage"] = a.GetMessageForNotification(notification.post, translateFunc)
template.Props["PostLink"] = siteURL + "/" + notification.teamName + "/pl/" + notification.post.Id
template.Props["SenderName"] = sender.GetDisplayName(displayNameFormat)
tm := time.Unix(notification.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 channel.Type == model.CHANNEL_DIRECT {
template.Props["ChannelName"] = translateFunc("api.email_batching.render_batched_post.direct_message")
} else if channel.Type == model.CHANNEL_GROUP {
template.Props["ChannelName"] = translateFunc("api.email_batching.render_batched_post.group_message")
} else {
// don't include channel name if email notification contents type is set to generic
if emailNotificationContentsType == model.EMAIL_NOTIFICATION_CONTENTS_FULL {
template.Props["ChannelName"] = channel.DisplayName
} else {
template.Props["ChannelName"] = translateFunc("api.email_batching.render_batched_post.notification")
}
}
return template.Render()
}
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