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package logic
import (
"regexp"
"rss_parrot/dal"
"rss_parrot/dto"
"rss_parrot/shared"
"strconv"
"time"
)
type IMessenger interface {
SendMessageAsync(byUser string, toInbox, msg string, mentions []*MsgMention, to, cc []string, inReplyTo string)
EnqueueBroadcast(user string, statusId string, tootedAt time.Time, msg string) error
}
type MsgMention struct {
Moniker string
UserUrl string
}
const maxParallelSends = 5
const tootLoopIdleWakeSec = 5
type messenger struct {
cfg *shared.Config
logger shared.ILogger
repo dal.IRepo
keyStore IKeyStore
sender IActivitySender
metrics IMetrics
idb shared.IdBuilder
reStatusId *regexp.Regexp
newTootsInQueue chan struct{}
tqProgress map[int]interface{}
}
func NewMessenger(
cfg *shared.Config,
logger shared.ILogger,
repo dal.IRepo,
keyStore IKeyStore,
sender IActivitySender,
metrics IMetrics,
) IMessenger {
m := messenger{
cfg: cfg,
logger: logger,
repo: repo,
keyStore: keyStore,
sender: sender,
metrics: metrics,
idb: shared.IdBuilder{Host: cfg.Host},
}
m.reStatusId = regexp.MustCompile("^https://[^/]+/u/[^/]+/status/([0-9]+)$")
m.newTootsInQueue = make(chan struct{})
m.tqProgress = make(map[int]interface{})
go m.tootQueueLoop()
return &m
}
func (m *messenger) SendMessageAsync(byUser string, toInbox, msg string,
mentions []*MsgMention, to, cc []string, inReplyTo string,
) {
go m.sendMessage(byUser, toInbox, msg, mentions, to, cc, inReplyTo)
}
func (m *messenger) sendMessage(byUser string, toInbox, msg string,
mentions []*MsgMention, to, cc []string, inReplyTo string,
) {
published := time.Now().UTC().Format(time.RFC3339)
var tags []dto.Tag
for _, mention := range mentions {
tags = append(tags, dto.Tag{Type: "Mention", Href: mention.UserUrl, Name: mention.Moniker})
}
var ptags *[]dto.Tag = nil
if len(tags) != 0 {
ptags = &tags
}
id := m.repo.GetNextId()
err := m.sendToInbox(byUser, id, to, cc, toInbox, &inReplyTo, published, msg, ptags)
if err != nil {
m.logger.Errorf("Failed to send message to inbox %s", toInbox)
}
}
func (m *messenger) EnqueueBroadcast(user string, statusId string, tootedAt time.Time, msg string) error {
followers, err := m.repo.GetFollowersByUser(user, true)
if err != nil {
return err
}
// Collect distinct shared inboxes
inboxes := make(map[string]struct{})
for _, f := range followers {
inboxName := f.SharedInbox
if inboxName == "" {
inboxName = f.UserInbox
}
if _, exists := inboxes[inboxName]; !exists {
inboxes[inboxName] = struct{}{}
}
}
if len(inboxes) == 0 {
return nil
}
// Create a queue item for each inbox
for inboxUrl := range inboxes {
err = m.repo.AddTootQueueItem(&dal.TootQueueItem{
SendingUser: user,
ToInbox: inboxUrl,
TootedAt: tootedAt,
StatusId: statusId,
Content: msg,
})
if err != nil {
return err
}
}
go func() {
m.newTootsInQueue <- struct{}{}
}()
return nil
}
func (m *messenger) tootQueueLoop() {
tootSent := make(chan int)
sendToots := func() {
if len(m.tqProgress) >= maxParallelSends {
return
}
maxId := -1
for id := range m.tqProgress {
maxId = max(maxId, id)
}
var err error
var items []*dal.TootQueueItem
var qlen int
items, qlen, err = m.repo.GetTootQueueItems(maxId, maxParallelSends-len(m.tqProgress))
if err != nil {
m.logger.Errorf("Failed to get toot queue items: %v", err)
return
}
m.metrics.TootQueueLength(qlen)
for _, item := range items {
m.tqProgress[item.Id] = struct{}{}
go m.sendQueuedToot(item, tootSent)
}
}
removeSentToot := func(id int) {
if err := m.repo.DeleteTootQueueItem(id); err != nil {
m.logger.Errorf("Failed to remove sent toot from queue: %d: %v", id, err)
}
delete(m.tqProgress, id)
}
for {
select {
case <-m.newTootsInQueue:
m.logger.Debug("New toots in queue")
sendToots()
case <-time.After(tootLoopIdleWakeSec * time.Second):
m.logger.Debug("Toot queue idle loop")
sendToots()
case id := <-tootSent:
m.logger.Debugf("Toot sent: %d", id)
removeSentToot(id)
sendToots()
}
}
}
func (m *messenger) getIdVal(statusIdUrl string) uint64 {
groups := m.reStatusId.FindStringSubmatch(statusIdUrl)
if groups == nil {
return m.repo.GetNextId()
}
idStr := groups[1]
var idVal int64
var err error
if idVal, err = strconv.ParseInt(idStr, 10, 64); err != nil {
return m.repo.GetNextId()
}
return uint64(idVal)
}
func (m *messenger) sendQueuedToot(item *dal.TootQueueItem, tootSent chan int) {
var err error
idb := shared.IdBuilder{Host: m.cfg.Host}
to := []string{shared.ActivityPublic}
userFollowers := idb.UserFollowers(item.SendingUser)
// This should never fail, but if it does, we just make up a new ID
idVal := m.getIdVal(item.StatusId)
err = m.sendToInbox(
item.SendingUser,
idVal,
to,
[]string{userFollowers},
item.ToInbox,
nil,
item.TootedAt.UTC().Format(time.RFC3339),
item.Content,
nil)
if err != nil {
m.logger.Errorf("Failed to send queued toot: %v", err)
}
m.metrics.FeedTootSent()
tootSent <- item.Id
}
func (m *messenger) sendToInbox(byUser string, idVal uint64, to, cc []string, toInbox string,
inReplyTo *string, published, message string, tag *[]dto.Tag) error {
m.logger.Infof("Sending to inbox: %s", toInbox)
privKey, err := m.keyStore.GetPrivKey(byUser)
if err != nil {
return err
}
note := &dto.Note{
Id: m.idb.UserStatus(byUser, idVal),
Type: "Note",
Published: published,
Summary: nil,
AttributedTo: m.idb.UserUrl(byUser),
InReplyTo: inReplyTo,
Content: message,
To: to,
Cc: cc,
Tag: tag,
}
act := &dto.ActivityOut{
Context: "https://www.w3.org/ns/activitystreams",
Id: m.idb.UserStatusActivity(byUser, idVal),
Type: "Create",
Actor: m.idb.UserUrl(byUser),
To: &to,
Cc: &cc,
Object: note,
}
m.sender.Send(privKey, byUser, toInbox, act)
return nil
}
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