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libcwtch-go
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Document Android edge case and clarify design of GetMessage
continuous-integration/drone/pr Build is passing Details

This commit is contained in:
Sarah Jamie Lewis 2021-06-30 11:10:08 -07:00
parent b0d8bb96c3
commit 750106496f
1 changed files with 36 additions and 25 deletions
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61
lib.go
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@ -493,36 +493,47 @@ type EnhancedMessage struct {
}
func GetMessage(profileOnion, handle string, message_index int) string {
profile := application.GetPeer(profileOnion)
ph := utils.NewPeerHelper(profile)
var message EnhancedMessage
if ph.IsGroup(handle) {
if len(profile.GetGroup(handle).Timeline.Messages) > message_index {
message.Message = profile.GetGroup(handle).Timeline.Messages[message_index]
message.ContactImage = ph.GetProfilePic(message.Message.PeerID)
} else {
// Message Index Request exceeded Timeline, most likely reason is this is a request for an
// unacknowledged sent message (it can take a many seconds for a message to be confirmed in the worst
// case).
offset := message_index - len(profile.GetGroup(handle).Timeline.Messages)
if len(profile.GetGroup(handle).UnacknowledgedMessages) > offset {
message.Message = profile.GetGroup(handle).UnacknowledgedMessages[offset]
// There is an edge case that can happen on Android when the app is shutdown while fetching messages...
// The worker threads that are spawned can become activated again when the app is opened attempt to finish their job...
// In that case we skip processing and just return the empty message...
// Note: This is far less likely to happen now that the UI only requests messages *after* syncing has happened and
// these requests complete almost immediately v.s. being stalled for seconds to minutes on large groups.
if application != nil {
profile := application.GetPeer(profileOnion)
ph := utils.NewPeerHelper(profile)
if ph.IsGroup(handle) {
// If we are safely within the limits of the timeline just grab the message at the index..
if len(profile.GetGroup(handle).Timeline.Messages) > message_index {
message.Message = profile.GetGroup(handle).Timeline.Messages[message_index]
message.ContactImage = ph.GetProfilePic(message.Message.PeerID)
} else {
log.Errorf("Couldn't find message in timeline or unacked messages, probably transient threading issue, but logging for visibility..")
// Message Index Request exceeded Timeline, most likely reason is this is a request for an
// unacknowledged sent message (it can take a many seconds for a message to be confirmed in the worst
// case).
offset := message_index - len(profile.GetGroup(handle).Timeline.Messages)
if len(profile.GetGroup(handle).UnacknowledgedMessages) > offset {
message.Message = profile.GetGroup(handle).UnacknowledgedMessages[offset]
message.ContactImage = ph.GetProfilePic(message.Message.PeerID)
} else {
log.Errorf("Couldn't find message in timeline or unacked messages, probably transient threading issue, but logging for visibility..")
}
}
}
} else {
if message_index < len(profile.GetContact(handle).Timeline.Messages) {
message.Message = profile.GetContact(handle).Timeline.Messages[message_index]
message.ContactImage = ph.GetProfilePic(handle)
} else {
log.Errorf("peerpeercontact getmessage out of range; sending counter resync just in case")
eventHandler.Push(event.NewEvent(event.MessageCounterResync, map[event.Field]string{
event.Identity: profileOnion,
event.RemotePeer: handle,
event.Data: strconv.Itoa(len(profile.GetContact(handle).Timeline.Messages)),
}))
// If we are safely within the limits of the timeline just grab the message at the index..
if len(profile.GetContact(handle).Timeline.Messages) > message_index {
message.Message = profile.GetContact(handle).Timeline.Messages[message_index]
message.ContactImage = ph.GetProfilePic(handle)
} else {
// Otherwise Send a counter resync event...this shouldn't really happen for p2p messages so we
// throw an error.
log.Errorf("peerpeercontact getmessage out of range; sending counter resync just in case")
eventHandler.Push(event.NewEvent(event.MessageCounterResync, map[event.Field]string{
event.Identity: profileOnion,
event.RemotePeer: handle,
event.Data: strconv.Itoa(len(profile.GetContact(handle).Timeline.Messages)),
}))
}
}
}
bytes, _ := json.Marshal(message)