// replyTopicDescBasic loads minimal topic Desc when the requester is not subscribed to the topic
func replyTopicDescBasic(sess *Session, topic string, get *MsgClientGet) {
log.Printf("hub.replyTopicDescBasic: topic %s", topic)
now := time.Now().UTC().Round(time.Millisecond)
desc := &MsgTopicDesc{}
if strings.HasPrefix(topic, "grp") {
stopic, err := store.Topics.Get(topic)
if err == nil {
desc.CreatedAt = &stopic.CreatedAt
desc.UpdatedAt = &stopic.UpdatedAt
desc.Public = stopic.Public
} else {
sess.queueOut(ErrUnknown(get.Id, get.Topic, now))
return
}
} else {
// 'me' and p2p topics
var uid types.Uid
if strings.HasPrefix(topic, "usr") {
// User specified as usrXXX
uid = types.ParseUserId(topic)
} else if strings.HasPrefix(topic, "p2p") {
// User specified as p2pXXXYYY
uid1, uid2, _ := types.ParseP2P(topic)
if uid1 == sess.uid {
uid = uid2
} else if uid2 == sess.uid {
uid = uid1
}
}
if uid.IsZero() {
sess.queueOut(ErrMalformed(get.Id, get.Topic, now))
return
}
suser, err := store.Users.Get(uid)
if err == nil {
desc.CreatedAt = &suser.CreatedAt
desc.UpdatedAt = &suser.UpdatedAt
desc.Public = suser.Public
} else {
log.Printf("hub.replyTopicInfoBasic: sending error 3")
sess.queueOut(ErrUnknown(get.Id, get.Topic, now))
return
}
}
log.Printf("hub.replyTopicDescBasic: sending desc -- OK")
sess.queueOut(&ServerComMessage{
Meta: &MsgServerMeta{Id: get.Id, Topic: get.Topic, Timestamp: &now, Desc: desc}})
}
// validateTopicName expands session specific topic name to global name
// Returns
// topic: session-specific topic name the message recepient should see
// routeTo: routable global topic name
// err: *ServerComMessage with an error to return to the sender
func (s *Session) validateTopicName(msgId, topic string, timestamp time.Time) (string, string, *ServerComMessage) {
if topic == "" {
return "", "", ErrMalformed(msgId, "", timestamp)
}
if !strings.HasPrefix(topic, "grp") && s.uid.IsZero() {
// me and p2p topics require authentication
return "", "", ErrAuthRequired(msgId, topic, timestamp)
}
// Topic to route to i.e. rcptto: or s.subs[routeTo]
routeTo := topic
if topic == "me" {
routeTo = s.uid.UserId()
} else if topic == "fnd" {
routeTo = s.uid.FndName()
} else if strings.HasPrefix(topic, "usr") {
// Initiating a p2p topic
uid2 := types.ParseUserId(topic)
if uid2.IsZero() {
// Ensure the user id is valid
return "", "", ErrMalformed(msgId, topic, timestamp)
} else if uid2 == s.uid {
// Use 'me' to access self-topic
return "", "", ErrPermissionDenied(msgId, topic, timestamp)
}
routeTo = s.uid.P2PName(uid2)
topic = routeTo
} else if strings.HasPrefix(topic, "p2p") {
uid1, uid2, err := types.ParseP2P(topic)
if err != nil || uid1.IsZero() || uid2.IsZero() || uid1 == uid2 {
// Ensure the user ids are valid
return "", "", ErrMalformed(msgId, topic, timestamp)
} else if uid1 != s.uid && uid2 != s.uid {
// One can't access someone else's p2p topic
return "", "", ErrPermissionDenied(msgId, topic, timestamp)
}
}
return topic, routeTo, nil
}
// Save message
func (MessagesObjMapper) Save(msg *types.Message) error {
msg.InitTimes()
// Need a transaction here, RethinkDB does not support transactions
// An invite (message to 'me') may have a zero SeqId if 'me' was inactive at the time of generating the invite
if msg.SeqId == 0 {
if user, err := adaptr.UserGet(types.ParseUserId(msg.Topic)); err != nil {
return err
} else {
msg.SeqId = user.SeqId + 1
}
}
if err := adaptr.TopicUpdateOnMessage(msg.Topic, msg); err != nil {
return err
}
return adaptr.MessageSave(msg)
}
// replySetSub is a response to new subscription request or an update to a subscription {set.sub}:
// update topic metadata cache, save/update subs, reply to the caller as {ctrl} message, generate an invite
func (t *Topic) replySetSub(h *Hub, sess *Session, set *MsgClientSet) error {
now := time.Now().UTC().Round(time.Millisecond)
var uid types.Uid
if uid = types.ParseUserId(set.Sub.User); uid.IsZero() && set.Sub.User != "" {
// Invalid user ID
sess.queueOut(ErrMalformed(set.Id, set.Topic, now))
return errors.New("invalid user id")
}
// if set.User is not set, request is for the current user
if !uid.IsZero() {
uid = sess.uid
}
if uid == sess.uid {
return t.requestSub(h, sess, set.Id, set.Sub.Mode, set.Sub.Info, nil, false)
} else {
return t.approveSub(h, sess, uid, set)
}
}
func (t *Topic) run(hub *Hub) {
log.Printf("Topic started: '%s'", t.name)
keepAlive := TOPICTIMEOUT // TODO(gene): read keepalive value from the command line
killTimer := time.NewTimer(time.Hour)
killTimer.Stop()
// 'me' only
var uaTimer *time.Timer
var currentUA string
uaTimer = time.NewTimer(time.Minute)
uaTimer.Stop()
for {
select {
case sreg := <-t.reg:
// Request to add a conection to this topic
// The topic is alive, so stop the kill timer, if it's ticking. We don't want the topic to die
// while processing the call
killTimer.Stop()
if err := t.handleSubscription(hub, sreg); err == nil {
// give a broadcast channel to the connection (.read)
// give channel to use when shutting down (.done)
sreg.sess.subs[t.name] = &Subscription{
broadcast: t.broadcast,
done: t.unreg,
meta: t.meta,
ping: t.uaChange}
t.sessions[sreg.sess] = true
} else if len(t.sessions) == 0 {
// Failed to subscribe, the topic is still inactive
killTimer.Reset(keepAlive)
}
case leave := <-t.unreg:
// Remove connection from topic; session may continue to function
if leave.unsub {
// User wants to leave and unsubscribe.
if err := t.replyLeaveUnsub(hub, leave.sess, leave.reqId, leave.topic); err != nil {
log.Panicln(err)
continue
}
} else {
now := time.Now().UTC().Round(time.Millisecond)
// Just leaving the topic without unsubscribing
delete(t.sessions, leave.sess)
pud := t.perUser[leave.sess.uid]
pud.online--
if t.cat == types.TopicCat_Me {
mrs := t.mostRecentSession()
if mrs == nil {
// Last session
mrs = leave.sess
} else {
// Change UA to the most recent live session
currentUA = mrs.userAgent
uaTimer.Reset(UA_TIMER_DELAY)
}
// Update user's last online timestamp & user agent
if err := store.Users.UpdateLastSeen(mrs.uid, mrs.userAgent, now); err != nil {
log.Println(err)
}
} else if t.cat == types.TopicCat_Grp && pud.online == 0 {
t.presPubChange(leave.sess.uid, "off")
}
t.perUser[leave.sess.uid] = pud
if leave.reqId != "" {
leave.sess.queueOut(NoErr(leave.reqId, leave.topic, now))
}
}
// If there are no more subscriptions to this topic, start a kill timer
if len(t.sessions) == 0 {
killTimer.Reset(keepAlive)
}
case msg := <-t.broadcast:
// Content message intended for broadcasting to recepients
// log.Printf("topic[%s].run: got message '%v'", t.name, msg)
// Record last message timestamp
if msg.Data != nil {
from := types.ParseUserId(msg.Data.From)
// msg.sessFrom is not nil when the message originated at the client.
// for internally generated messages, like invites, the akn is nil
if msg.sessFrom != nil {
userData := t.perUser[from]
if userData.modeWant&userData.modeGiven&types.ModePub == 0 {
msg.sessFrom.queueOut(ErrPermissionDenied(msg.id, t.original, msg.timestamp))
continue
}
}
if err := store.Messages.Save(&types.Message{
ObjHeader: types.ObjHeader{CreatedAt: msg.Data.Timestamp},
SeqId: t.lastId + 1,
Topic: t.name,
From: from.String(),
Content: msg.Data.Content}); err != nil {
log.Printf("topic[%s].run: failed to save message: %v", t.name, err)
msg.sessFrom.queueOut(ErrUnknown(msg.id, t.original, msg.timestamp))
continue
}
t.lastId++
msg.Data.SeqId = t.lastId
if msg.id != "" {
reply := NoErrAccepted(msg.id, t.original, msg.timestamp)
reply.Ctrl.Params = map[string]int{"seq": t.lastId}
msg.sessFrom.queueOut(reply)
}
t.presPubMessageSent(t.lastId)
} else if msg.Pres != nil {
// log.Printf("topic[%s].run: pres.src='%s' what='%s'", t.name, msg.Pres.Src, msg.Pres.What)
t.presProcReq(msg.Pres.Src, (msg.Pres.What == "on"), msg.Pres.wantReply)
if t.original != msg.Pres.Topic {
// This is just a request for status, don't forward it to sessions
continue
}
} else if msg.Info != nil {
if msg.Info.SeqId > t.lastId {
// Skip bogus read notification
continue
}
if msg.Info.What == "read" || msg.Info.What == "recv" {
uid := types.ParseUserId(msg.Info.From)
pud := t.perUser[uid]
var read, recv int
if msg.Info.What == "read" {
if msg.Info.SeqId > pud.readId {
pud.readId = msg.Info.SeqId
read = pud.readId
} else {
// No need to report stale or bogus read status
continue
}
} else if msg.Info.What == "recv" {
if msg.Info.SeqId > pud.recvId {
pud.recvId = msg.Info.SeqId
recv = pud.recvId
} else {
continue
}
}
if pud.readId > pud.recvId {
pud.recvId = pud.readId
recv = pud.recvId
}
if err := store.Subs.Update(t.name, uid,
map[string]interface{}{
"RecvSeqId": pud.recvId,
"ReadSeqId": pud.readId}); err != nil {
log.Printf("topic[%s].run: failed to update SeqRead/Recv counter: %v", t.name, err)
continue
}
t.presPubMessageCount(msg.sessSkip, 0, recv, read)
t.perUser[uid] = pud
}
}
// Broadcast the message. Only {data}, {pres}, {ping} are broadcastable.
// {meta} and {ctrl} are sent to the session only
if msg.Data != nil || msg.Pres != nil || msg.Info != nil {
var packet, _ = json.Marshal(msg)
for sess := range t.sessions {
if sess == msg.sessSkip {
continue
}
select {
case sess.send <- packet:
default:
log.Printf("topic[%s].run: connection stuck, detaching", t.name)
t.unreg <- &sessionLeave{sess: sess, unsub: false}
}
}
} else {
log.Printf("topic[%s].run: wrong message type for broadcasting", t.name)
}
case meta := <-t.meta:
log.Printf("topic[%s].run: got meta message '%v'", t.name, meta)
// Request to get/set topic metadata
if meta.pkt.Get != nil {
// Get request
if meta.what&constMsgMetaDesc != 0 {
t.replyGetDesc(meta.sess, meta.pkt.Get.Id, false, meta.pkt.Get.Desc)
}
if meta.what&constMsgMetaSub != 0 {
t.replyGetSub(meta.sess, meta.pkt.Get.Id, meta.pkt.Get.Sub)
}
if meta.what&constMsgMetaData != 0 {
t.replyGetData(meta.sess, meta.pkt.Get.Id, meta.pkt.Get.Data)
}
} else if meta.pkt.Set != nil {
// Set request
if meta.what&constMsgMetaDesc != 0 {
t.replySetDesc(meta.sess, meta.pkt.Set)
}
if meta.what&constMsgMetaSub != 0 {
t.replySetSub(hub, meta.sess, meta.pkt.Set)
}
} else if meta.pkt.Del != nil {
// Del request
if meta.what == constMsgDelMsg {
t.replyDelMsg(meta.sess, meta.pkt.Del)
} else if meta.what == constMsgDelTopic {
t.replyDelTopic(hub, meta.sess, meta.pkt.Del)
}
}
case ua := <-t.uaChange:
// process an update to user agent from one of the sessions
currentUA = ua
uaTimer.Reset(UA_TIMER_DELAY)
case <-uaTimer.C:
// Publish user agent changes after a delay
t.presPubUAChange(currentUA)
case <-killTimer.C:
// Topic timeout
log.Println("Topic timeout: ", t.name)
hub.unreg <- &topicUnreg{topic: t.name}
if t.cat == types.TopicCat_Me {
t.presPubMeChange("off", currentUA)
}
return
case sd := <-t.exit:
// Perform cleanup and database updates before server shuts down.
// FIXME(gene): save lastMessage value;
if t.cat == types.TopicCat_Me {
t.presPubMeChange("off", currentUA)
} else if t.cat == types.TopicCat_Grp {
if sd.del {
t.presPubTopicOnline("gone")
} else {
t.presPubTopicOnline("off")
}
} // not publishing online/offline to P2P topics
// Report completion back to sender, if 'done' is not nil.
if sd.done != nil {
sd.done <- true
}
return
}
}
}
// topicInit reads an existing topic from database or creates a new topic
func topicInit(sreg *sessionJoin, h *Hub) {
var t *Topic
timestamp := time.Now().UTC().Round(time.Millisecond)
t = &Topic{name: sreg.topic,
original: sreg.pkt.Topic,
sessions: make(map[*Session]bool),
broadcast: make(chan *ServerComMessage, 256),
reg: make(chan *sessionJoin, 32),
unreg: make(chan *sessionLeave, 32),
meta: make(chan *metaReq, 32),
perUser: make(map[types.Uid]perUserData),
exit: make(chan *shutDown, 1),
}
// Request to load a 'me' topic. The topic always axists.
if t.original == "me" {
log.Println("hub: loading 'me' topic")
t.cat = types.TopicCat_Me
// 'me' has no owner, t.owner = nil
// Ensure all requests to subscribe are automatically rejected
t.accessAuth = types.ModeBanned
t.accessAnon = types.ModeBanned
user, err := store.Users.Get(sreg.sess.uid)
if err != nil {
log.Println("hub: cannot load user object for 'me'='" + t.name + "' (" + err.Error() + ")")
sreg.sess.queueOut(ErrUnknown(sreg.pkt.Id, t.original, timestamp))
return
}
if err = t.loadSubscribers(); err != nil {
log.Println("hub: cannot load subscribers for '" + t.name + "' (" + err.Error() + ")")
sreg.sess.queueOut(ErrUnknown(sreg.pkt.Id, t.original, timestamp))
return
}
t.public = user.Public
t.created = user.CreatedAt
t.updated = user.UpdatedAt
t.lastId = user.SeqId
t.clearId = user.ClearId
// Initiate User Agent with the UA of the creating session to report it later
t.userAgent = sreg.sess.userAgent
// Request to load a 'find' topic. The topic always exists.
} else if t.original == "fnd" {
log.Println("hub: loading 'fnd' topic")
t.cat = types.TopicCat_Fnd
// 'fnd' has no owner, t.owner = nil
// The p2p topic cannot be accessed by anyone but the 2 participants. Access is checked at the session level.
// Set default access in case user leaves - joins.
t.accessAuth = types.ModeBanned
t.accessAnon = types.ModeBanned
if err := t.loadSubscribers(); err != nil {
log.Println("hub: cannot load subscribers for '" + t.name + "' (" + err.Error() + ")")
sreg.sess.queueOut(ErrUnknown(sreg.pkt.Id, t.original, timestamp))
return
}
// Public is not set.
// t.public = nil
t.created = t.perUser[sreg.sess.uid].created
t.updated = t.perUser[sreg.sess.uid].updated
// Publishing to Find is not supported
// t.lastId = 0
// Request to attach to a firehause topic. Must be root.
} else if t.original == "fh" {
log.Println("hub: loading 'fh' topic")
t.cat = types.TopicCat_Fh
// 'fh' has no owner, t.owner = nil
// The fh can be accessed by anyone with root access
// t.accessAuth = types.ModeBanned
// t.accessAnon = types.ModeBanned
// Subscriptions are ephemeral, no need to load subscribers.
// TODO(gene): handle public more intelligently
// t.public = nil
// Publishing to Fh is not supported, history is not supported.
// t.lastId = 0
// Request to load an existing or create a new p2p topic, then attach to it.
} else if strings.HasPrefix(t.original, "usr") || strings.HasPrefix(t.original, "p2p") {
log.Println("hub: loading or creating p2p topic")
// Handle the following cases:
// 1. Neither topic nor subscriptions exist: create a new p2p topic & subscriptions.
// 2. Topic exists, one of the subscriptions is missing:
// 2.1 Requester's subscription is missing, recreate it.
// 2.2 Other user's subscription is missing, treat like a new request for user 2.
// 3. Topic exists, both subscriptions are missing: should not happen, fail.
// 4. Topic and both subscriptions exist: attach to topic
t.cat = types.TopicCat_P2P
// Check if the topic already exists
stopic, err := store.Topics.Get(t.name)
if err != nil {
log.Println("hub: error while loading topic '" + t.name + "' (" + err.Error() + ")")
sreg.sess.queueOut(ErrUnknown(sreg.pkt.Id, t.name, timestamp))
return
}
// If topic exists, load subscriptions
var subs []types.Subscription
if stopic != nil {
// Subs already have Public swapped
if subs, err = store.Topics.GetSubs(t.name); err != nil {
log.Println("hub: cannot load subscritions for '" + t.name + "' (" + err.Error() + ")")
sreg.sess.queueOut(ErrUnknown(sreg.pkt.Id, t.name, timestamp))
return
}
// Case 3, fail
if len(subs) == 0 {
log.Println("hub: missing both subscriptions for '" + t.name + "' (SHOULD NEVER HAPPEN!)")
sreg.sess.queueOut(ErrUnknown(sreg.pkt.Id, t.name, timestamp))
return
}
t.created = stopic.CreatedAt
t.updated = stopic.UpdatedAt
t.lastId = stopic.SeqId
}
// t.owner is blank for p2p topics
// Ensure that other users are automatically rejected
t.accessAuth = types.ModeP2P
t.accessAnon = types.ModeBanned
// t.public is not used for p2p topics since each user get a different public
// Custom default access levels set in sreg.pkt.Init.DefaultAcs are ignored
if stopic != nil && len(subs) == 2 {
// Case 4.
log.Println("hub: existing p2p topic")
// t.clearId is not used in P2P topics, may change later
for i := 0; i < 2; i++ {
uid := types.ParseUid(subs[i].User)
t.perUser[uid] = perUserData{
// Adapter already swapped the public values
public: subs[i].GetPublic(),
private: subs[i].Private,
// lastSeenTag: subs[i].LastSeen,
modeWant: subs[i].ModeWant,
modeGiven: subs[i].ModeGiven}
}
} else {
// Cases 1, 2
log.Println("hub: p2p new topic or one of the subs missing")
var userData perUserData
// Fetching records for both users.
// Requester.
userId1 := sreg.sess.uid
// The other user.
userId2 := types.ParseUserId(t.original)
var u1, u2 int
users, err := store.Users.GetAll(userId1, userId2)
if err != nil {
log.Println("hub: failed to load users for '" + t.name + "' (" + err.Error() + ")")
sreg.sess.queueOut(ErrUnknown(sreg.pkt.Id, t.name, timestamp))
return
} else if len(users) != 2 {
// Invited user does not exist
log.Println("hub: missing user for '" + t.name + "'")
sreg.sess.queueOut(ErrUserNotFound(sreg.pkt.Id, t.name, timestamp))
return
} else {
// User records are unsorted, make sure we know who is who.
if users[0].Uid() == userId1 {
u1, u2 = 0, 1
} else {
u1, u2 = 1, 0
}
}
// Figure out which subscriptions are missing: User1's, User2's or both.
var sub1, sub2 *types.Subscription
// Set to true if only requester's subscription was created
var user1only bool
if len(subs) == 1 {
if subs[0].Uid() == userId1 {
// User2's subscription is missing
sub1 = &subs[0]
} else {
// User1's is missing
sub2 = &subs[0]
user1only = true
}
}
if sub1 == nil {
if sreg.pkt.Set != nil && sreg.pkt.Set.Desc != nil && !isNullValue(sreg.pkt.Set.Desc.Private) {
userData.private = sreg.pkt.Set.Desc.Private
// Init.DefaultAcs and Init.Public are ignored for p2p topics
}
// User may set non-default access to topic, just make sure it's no higher than the default
if sreg.pkt.Set != nil && sreg.pkt.Set.Sub != nil && sreg.pkt.Set.Sub.Mode != "" {
if err := userData.modeWant.UnmarshalText([]byte(sreg.pkt.Set.Sub.Mode)); err != nil {
log.Println("hub: invalid access mode for topic '" + t.name + "': '" + sreg.pkt.Set.Sub.Mode + "'")
userData.modeWant = types.ModeP2P
} else {
// FIXME(gene): check for Mode.Banned
userData.modeWant &= types.ModeP2P
}
} else if users[u1].Access.Auth != types.ModeNone {
userData.modeWant = users[u1].Access.Auth
} else {
userData.modeWant = types.ModeP2P
}
sub1 = &types.Subscription{
User: userId1.String(),
Topic: t.name,
ModeWant: userData.modeWant,
ModeGiven: types.ModeP2P,
Private: userData.private}
// Swap Public to match swapped Public in subs returned from store.Topics.GetSubs
sub1.SetPublic(users[u2].Public)
}
if sub2 == nil {
sub2 = &types.Subscription{
User: userId2.String(),
Topic: t.name,
ModeWant: users[u2].Access.Auth,
ModeGiven: types.ModeP2P,
Private: nil}
// Swap Public to match swapped Public in subs returned from store.Topics.GetSubs
sub2.SetPublic(users[u1].Public)
}
// Create everything
if stopic == nil {
if err = store.Topics.CreateP2P(sub1, sub2); err != nil {
log.Println("hub: databse error in creating subscriptions '" + t.name + "' (" + err.Error() + ")")
sreg.sess.queueOut(ErrUnknown(sreg.pkt.Id, t.name, timestamp))
return
}
t.created = sub1.CreatedAt
t.updated = sub1.UpdatedAt
// t.lastId is not set (default 0) for new topics
} else {
// Recreate one of the subscriptions
var subToMake *types.Subscription
if user1only {
subToMake = sub1
} else {
subToMake = sub2
}
if err = store.Subs.Create(subToMake); err != nil {
log.Println("hub: databse error in re-subscribing user '" + t.name + "' (" + err.Error() + ")")
sreg.sess.queueOut(ErrUnknown(sreg.pkt.Id, t.name, timestamp))
return
}
}
// t.clearId is not currently used for p2p topics
// Publics is already swapped
userData.public = sub1.GetPublic()
userData.modeWant = sub1.ModeWant
userData.modeGiven = sub1.ModeGiven
t.perUser[userId1] = userData
t.perUser[userId2] = perUserData{
public: sub2.GetPublic(),
modeWant: sub2.ModeWant,
modeGiven: sub2.ModeGiven,
}
sreg.created = !user1only
}
t.original = t.name
// Processing request to create a new generic (group) topic:
} else if t.original == "new" {
log.Println("hub: new group topic")
t.cat = types.TopicCat_Grp
// Generic topics have parameters stored in the topic object
t.owner = sreg.sess.uid
t.accessAuth = DEFAULT_AUTH_ACCESS
t.accessAnon = DEFAULT_ANON_ACCESS
// Owner/creator gets full access to the topic. Owner may change the default modeWant through 'set'.
userData := perUserData{
modeGiven: types.ModeFull,
modeWant: types.ModeFull}
if sreg.pkt.Set != nil {
// User sent initialization parameters
if sreg.pkt.Set.Desc != nil {
if !isNullValue(sreg.pkt.Set.Desc.Public) {
t.public = sreg.pkt.Set.Desc.Public
}
if !isNullValue(sreg.pkt.Set.Desc.Private) {
userData.private = sreg.pkt.Set.Desc.Private
}
// set default access
if sreg.pkt.Set.Desc.DefaultAcs != nil {
if auth, anon, err := parseTopicAccess(sreg.pkt.Set.Desc.DefaultAcs, t.accessAuth, t.accessAnon); err != nil {
log.Println("hub: invalid access mode for topic '" + t.name + "': '" + err.Error() + "'")
} else if auth&types.ModeOwner != 0 || anon&types.ModeOwner != 0 {
log.Println("hub: OWNER default access in topic '" + t.name)
} else {
t.accessAuth, t.accessAnon = auth, anon
}
}
}
// Owner/creator may restrict own access to topic
if sreg.pkt.Set.Sub == nil || sreg.pkt.Set.Sub.Mode == "" {
userData.modeWant = types.ModeFull
} else {
if err := userData.modeWant.UnmarshalText([]byte(sreg.pkt.Set.Sub.Mode)); err != nil {
log.Println("hub: invalid access mode for topic '" + t.name + "': '" + sreg.pkt.Set.Sub.Mode + "'")
}
}
}
t.perUser[t.owner] = userData
t.created = timestamp
t.updated = timestamp
// t.lastId & t.clearId are not set for new topics
stopic := &types.Topic{
ObjHeader: types.ObjHeader{Id: sreg.topic, CreatedAt: timestamp},
Access: types.DefaultAccess{Auth: t.accessAuth, Anon: t.accessAnon},
Public: t.public}
// store.Topics.Create will add a subscription record for the topic creator
stopic.GiveAccess(t.owner, userData.modeWant, userData.modeGiven)
err := store.Topics.Create(stopic, t.owner, t.perUser[t.owner].private)
if err != nil {
log.Println("hub: cannot save new topic '" + t.name + "' (" + err.Error() + ")")
// Error sent on "new" topic
sreg.sess.queueOut(ErrUnknown(sreg.pkt.Id, t.original, timestamp))
return
}
t.original = t.name // keeping 'new' as original has no value to the client
sreg.created = true
} else {
log.Println("hub: existing group topic")
t.cat = types.TopicCat_Grp
// TODO(gene): check and validate topic name
stopic, err := store.Topics.Get(t.name)
if err != nil {
log.Println("hub: error while loading topic '" + t.name + "' (" + err.Error() + ")")
sreg.sess.queueOut(ErrUnknown(sreg.pkt.Id, t.original, timestamp))
return
} else if stopic == nil {
log.Println("hub: topic '" + t.name + "' does not exist")
sreg.sess.queueOut(ErrTopicNotFound(sreg.pkt.Id, t.original, timestamp))
return
}
if err = t.loadSubscribers(); err != nil {
log.Println("hub: cannot load subscribers for '" + t.name + "' (" + err.Error() + ")")
sreg.sess.queueOut(ErrUnknown(sreg.pkt.Id, t.original, timestamp))
return
}
// t.owner is set by loadSubscriptions
t.accessAuth = stopic.Access.Auth
t.accessAnon = stopic.Access.Anon
t.public = stopic.Public
t.created = stopic.CreatedAt
t.updated = stopic.UpdatedAt
t.lastId = stopic.SeqId
t.clearId = stopic.ClearId
}
log.Println("hub: topic created or loaded: " + t.name)
h.topicPut(t.name, t)
h.topicsLive.Add(1)
go t.run(h)
sreg.loaded = true
// Topic will check access rights, send invite to p2p user, send {ctrl} message to the initiator session
t.reg <- sreg
}
func (h *Hub) run() {
for {
select {
case sreg := <-h.join:
// Handle a subscription request:
// 1. Init topic
// 1.1 If a new topic is requested, create it
// 1.2 If a new subscription to an existing topic is requested:
// 1.2.1 check if topic is already loaded
// 1.2.2 if not, load it
// 1.2.3 if it cannot be loaded (not found), fail
// 2. Check access rights and reject, if appropriate
// 3. Attach session to the topic
t := h.topicGet(sreg.topic) // is the topic already loaded?
if t == nil {
// Topic does not exist or not loaded
go topicInit(sreg, h)
} else {
// Topic found.
// Topic will check access rights and send appropriate {ctrl}
t.reg <- sreg
}
case msg := <-h.route:
// This is a message from a connection not subscribed to topic
// Route incoming message to topic if topic permits such routing
timestamp := time.Now().UTC().Round(time.Millisecond)
if dst := h.topicGet(msg.rcptto); dst != nil {
// Everything is OK, sending packet to known topic
//log.Printf("Hub. Sending message to '%s'", dst.name)
if dst.broadcast != nil {
select {
case dst.broadcast <- msg:
default:
log.Printf("hub: topic's broadcast queue is full '%s'", dst.name)
}
}
} else {
if msg.Data != nil {
// Normally the message is persisted at the topic. If the topic is offline,
// persist message here. The only case of sending to offline topics is invites/info to 'me'
// The 'me' must receive them, so ignore access settings
if err := store.Messages.Save(&types.Message{
ObjHeader: types.ObjHeader{CreatedAt: msg.Data.Timestamp},
Topic: msg.rcptto,
// SeqId is assigned by the store.Mesages.Save
From: types.ParseUserId(msg.Data.From).String(),
Content: msg.Data.Content}); err != nil {
msg.sessFrom.queueOut(ErrUnknown(msg.id, msg.Data.Topic, timestamp))
return
}
// TODO(gene): validate topic name, discarding invalid topics
log.Printf("Hub. Topic[%s] is unknown or offline", msg.rcptto)
for tt, _ := range h.topics {
log.Printf("Hub contains topic '%s'", tt)
}
msg.sessFrom.queueOut(NoErrAccepted(msg.id, msg.rcptto, timestamp))
}
}
case meta := <-h.meta:
log.Println("hub.meta: got message")
// Request for topic info from a user who is not subscribed to the topic
if dst := h.topicGet(meta.topic); dst != nil {
// If topic is already in memory, pass request to topic
dst.meta <- meta
} else if meta.pkt.Get != nil {
// If topic is not in memory, fetch requested description from DB and reply here
go replyTopicDescBasic(meta.sess, meta.topic, meta.pkt.Get)
}
case unreg := <-h.unreg:
// The topic is being garbage collected or deleted.
h.topicUnreg(unreg.sess, unreg.topic, unreg.msg, unreg.fromSession, unreg.del)
case hubdone := <-h.shutdown:
topicsdone := make(chan bool)
for _, topic := range h.topics {
topic.exit <- &shutDown{done: topicsdone}
}
for i := 0; i < len(h.topics); i++ {
<-topicsdone
}
log.Printf("Hub shutdown: terminated %d topics", len(h.topics))
// let the main goroutine know we are done with the cleanup
hubdone <- true
return
case <-time.After(IDLETIMEOUT):
}
}
}
// topicInit reads an existing topic from database or creates a new topic
func topicInit(sreg *sessionJoin, h *Hub) {
var t *Topic
timestamp := time.Now().UTC().Round(time.Millisecond)
t = &Topic{name: sreg.topic,
original: sreg.pkt.Topic,
sessions: make(map[*Session]bool),
broadcast: make(chan *ServerComMessage, 256),
reg: make(chan *sessionJoin, 32),
unreg: make(chan *sessionLeave, 32),
meta: make(chan *metaReq, 32),
perUser: make(map[types.Uid]perUserData),
shutdown: make(chan chan<- bool, 1),
}
// Request to load a me topic. The topic must exist
if t.original == "me" {
log.Println("hub: loading me topic")
t.cat = TopicCat_Me
// 'me' has no owner, t.owner = nil
// Ensure all requests to subscribe are automatically rejected
t.accessAuth = types.ModeBanned
t.accessAnon = types.ModeBanned
user, err := store.Users.Get(sreg.sess.uid)
if err != nil {
log.Println("hub: cannot load user object for 'me'='" + t.name + "' (" + err.Error() + ")")
sreg.sess.QueueOut(ErrUnknown(sreg.pkt.Id, t.original, timestamp))
return
}
if err = t.loadSubscribers(); err != nil {
log.Println("hub: cannot load subscribers for '" + t.name + "' (" + err.Error() + ")")
sreg.sess.QueueOut(ErrUnknown(sreg.pkt.Id, t.original, timestamp))
return
}
t.public = user.Public
t.created = user.CreatedAt
t.updated = user.UpdatedAt
t.lastId = user.SeqId
t.clearId = user.ClearId
// Initiate User Agent with the UA of the creating session so we don't report it later
t.userAgent = sreg.sess.userAgent
// Request to create a new p2p topic, then attach to it
} else if strings.HasPrefix(t.original, "usr") {
log.Println("hub: new p2p topic")
t.cat = TopicCat_P2P
// t.owner is blank for p2p topics
// Ensure that other users are automatically rejected
t.accessAuth = types.ModeBanned
t.accessAnon = types.ModeBanned
var userData perUserData
if sreg.pkt.Init != nil && !isNullValue(sreg.pkt.Init.Private) {
// t.public is not used for p2p topics since each user get a different public
userData.private = sreg.pkt.Init.Private
// Init.DefaultAcs and Init.Public are ignored for p2p topics
}
// Custom default access levels set in sreg.pkt.Init.DefaultAcs are ignored
// Fetch user's public and default access
userId1 := sreg.sess.uid
userId2 := types.ParseUserId(t.original)
users, err := store.Users.GetAll(userId1, userId2)
if err != nil {
log.Println("hub: failed to load users for '" + t.name + "' (" + err.Error() + ")")
sreg.sess.QueueOut(ErrUnknown(sreg.pkt.Id, t.name, timestamp))
return
} else if len(users) != 2 {
// invited user does not exist
log.Println("hub: missing user for '" + t.name + "'")
sreg.sess.QueueOut(ErrUserNotFound(sreg.pkt.Id, t.name, timestamp))
return
}
var u1, u2 int
if users[0].Uid() == userId1 {
u1 = 0
u2 = 1
} else {
u1 = 1
u2 = 0
}
// User may set non-default access to topic, just make sure it's no higher than the default
if sreg.pkt.Sub != nil && sreg.pkt.Sub.Mode != "" {
if err := userData.modeWant.UnmarshalText([]byte(sreg.pkt.Sub.Mode)); err != nil {
log.Println("hub: invalid access mode for topic '" + t.name + "': '" + sreg.pkt.Sub.Mode + "'")
userData.modeWant = types.ModeP2P
} else {
userData.modeWant &= types.ModeP2P
}
} else if users[u1].Access.Auth != types.ModeNone {
userData.modeWant = users[u1].Access.Auth
} else {
userData.modeWant = types.ModeP2P
}
user1 := &types.Subscription{
User: userId1.String(),
Topic: t.name,
ModeWant: userData.modeWant,
ModeGiven: types.ModeP2P,
Private: userData.private}
user1.SetPublic(users[u1].Public)
user2 := &types.Subscription{
User: userId2.String(),
Topic: t.name,
ModeWant: users[u2].Access.Auth,
ModeGiven: types.ModeP2P,
Private: nil}
user2.SetPublic(users[u2].Public)
err = store.Topics.CreateP2P(user1, user2)
if err != nil {
log.Println("hub: databse error in creating subscriptions '" + t.name + "' (" + err.Error() + ")")
sreg.sess.QueueOut(ErrUnknown(sreg.pkt.Id, t.name, timestamp))
return
}
// t.public is not used for p2p topics since each user gets a different public
t.created = user1.CreatedAt
t.updated = user1.UpdatedAt
// t.lastId is not set (default 0) for new topics
// t.clearId is not currently used for p2p topics
userData.public = user2.GetPublic()
userData.modeWant = user1.ModeWant
userData.modeGiven = user1.ModeGiven
t.perUser[userId1] = userData
t.perUser[userId2] = perUserData{
public: user1.GetPublic(),
modeWant: user2.ModeWant,
modeGiven: user2.ModeGiven,
}
t.original = t.name
sreg.created = true
// Load an existing p2p topic
} else if strings.HasPrefix(t.name, "p2p") {
log.Println("hub: existing p2p topic")
t.cat = TopicCat_P2P
// t.owner no valid owner for p2p topics, leave blank
// Ensure that other users are automatically rejected
t.accessAuth = types.ModeBanned
t.accessAnon = types.ModeBanned
// Load the topic object
stopic, err := store.Topics.Get(t.name)
if err != nil {
log.Println("hub: error while loading topic '" + t.name + "' (" + err.Error() + ")")
sreg.sess.QueueOut(ErrUnknown(sreg.pkt.Id, t.original, timestamp))
return
} else if stopic == nil {
log.Println("hub: topic '" + t.name + "' does not exist")
sreg.sess.QueueOut(ErrTopicNotFound(sreg.pkt.Id, t.original, timestamp))
return
}
subs, err := store.Topics.GetSubs(t.name)
if err != nil {
log.Println("hub: cannot load subscritions for '" + t.name + "' (" + err.Error() + ")")
sreg.sess.QueueOut(ErrUnknown(sreg.pkt.Id, t.name, timestamp))
return
} else if len(subs) != 2 {
log.Println("hub: invalid number of subscriptions for '" + t.name + "'")
sreg.sess.QueueOut(ErrTopicNotFound(sreg.pkt.Id, t.name, timestamp))
return
}
// t.public is not used for p2p topics since each user gets a different public
t.created = stopic.CreatedAt
t.updated = stopic.UpdatedAt
t.lastId = stopic.SeqId
// t.clearId is not used in P2P topics, may change later
for i := 0; i < 2; i++ {
uid := types.ParseUid(subs[i].User)
t.perUser[uid] = perUserData{
// Based on other user
public: subs[(i+1)%2].GetPublic(),
private: subs[i].Private,
// lastSeenTag: subs[i].LastSeen,
modeWant: subs[i].ModeWant,
modeGiven: subs[i].ModeGiven}
}
// Processing request to create a new generic (group) topic:
} else if t.original == "new" {
log.Println("hub: new group topic")
t.cat = TopicCat_Grp
// Generic topics have parameters stored in the topic object
t.owner = sreg.sess.uid
t.accessAuth = DEFAULT_AUTH_ACCESS
t.accessAnon = DEFAULT_ANON_ACCESS
// Owner/creator gets full access to topic
userData := perUserData{modeGiven: types.ModeFull}
// User sent initialization parameters
if sreg.pkt.Init != nil {
if !isNullValue(sreg.pkt.Init.Public) {
t.public = sreg.pkt.Init.Public
}
if !isNullValue(sreg.pkt.Init.Private) {
userData.private = sreg.pkt.Init.Private
}
// set default access
if sreg.pkt.Init.DefaultAcs != nil {
if auth, anon, err := parseTopicAccess(sreg.pkt.Init.DefaultAcs, t.accessAuth, t.accessAnon); err != nil {
log.Println("hub: invalid access mode for topic '" + t.name + "': '" + err.Error() + "'")
} else if auth&types.ModeOwner != 0 || anon&types.ModeOwner != 0 {
log.Println("hub: OWNER default access in topic '" + t.name)
} else {
t.accessAuth, t.accessAnon = auth, anon
}
}
}
// Owner/creator may restrict own access to topic
if sreg.pkt.Sub == nil || sreg.pkt.Sub.Mode == "" {
userData.modeWant = types.ModeFull
} else {
if err := userData.modeWant.UnmarshalText([]byte(sreg.pkt.Sub.Mode)); err != nil {
log.Println("hub: invalid access mode for topic '" + t.name + "': '" + sreg.pkt.Sub.Mode + "'")
}
}
t.perUser[t.owner] = userData
t.created = timestamp
t.updated = timestamp
// t.lastId & t.clearId are not set for new topics
stopic := &types.Topic{
ObjHeader: types.ObjHeader{CreatedAt: timestamp},
Name: sreg.topic,
Access: types.DefaultAccess{Auth: t.accessAuth, Anon: t.accessAnon},
Public: t.public}
// store.Topics.Create will add a subscription record for the topic creator
stopic.GiveAccess(t.owner, userData.modeWant, userData.modeGiven)
err := store.Topics.Create(stopic, t.owner, t.perUser[t.owner].private)
if err != nil {
log.Println("hub: cannot save new topic '" + t.name + "' (" + err.Error() + ")")
// Error sent on "new" topic
sreg.sess.QueueOut(ErrUnknown(sreg.pkt.Id, t.original, timestamp))
return
}
t.original = t.name // keeping 'new' as original has no value to the client
sreg.created = true
} else {
log.Println("hub: existing group topic")
t.cat = TopicCat_Grp
// TODO(gene): check and validate topic name
stopic, err := store.Topics.Get(t.name)
if err != nil {
log.Println("hub: error while loading topic '" + t.name + "' (" + err.Error() + ")")
sreg.sess.QueueOut(ErrUnknown(sreg.pkt.Id, t.original, timestamp))
return
} else if stopic == nil {
log.Println("hub: topic '" + t.name + "' does not exist")
sreg.sess.QueueOut(ErrTopicNotFound(sreg.pkt.Id, t.original, timestamp))
return
}
if err = t.loadSubscribers(); err != nil {
log.Println("hub: cannot load subscribers for '" + t.name + "' (" + err.Error() + ")")
sreg.sess.QueueOut(ErrUnknown(sreg.pkt.Id, t.original, timestamp))
return
}
// t.owner is set by loadSubscriptions
t.accessAuth = stopic.Access.Auth
t.accessAnon = stopic.Access.Anon
t.public = stopic.Public
t.created = stopic.CreatedAt
t.updated = stopic.UpdatedAt
t.lastId = stopic.SeqId
t.clearId = stopic.ClearId
}
log.Println("hub: topic created or loaded: " + t.name)
h.topicPut(t.name, t)
h.topicsLive.Add(1)
go t.run(h)
sreg.loaded = true
// Topic will check access rights, send invite to p2p user, send {ctrl} message to the initiator session
t.reg <- sreg
}