There are a couple of hardcoded UA checks targeted at iOS endpoints
introduced circa 2.2-beta. One of those pops up an "unsupported" toast
when the device joins a conference - the other blocks camera
sharing.
Those checks are outdated since we transitioned to minBrowserVersions
approach that redirects the client to an unsupported view upon join. I
also assume the checks are bugged since, in some environments, it flags
iPadOS endpoints as iOS and version-checks it to a hardcoded "12.2"
threshold (which is incompatible with iPadOS versioning). That caused
camera sharing not to work, which is a false negative.
I consider the checks to be outdated, so I removed all references to
them.
There's a scenario where remote streams won't be attached again if the
sharer experienced a Meteor/client disconnection.
The disconnection empties some necessary user data temporarily, which
causes the corresponding video-list-item to be unmounted while the peer
persists for a little longer.
If the sharer re-connects fast enough, video-list-item will re-mount but
will 1) miss the current stream state (ie stuck in loading) 2) fail to
re-attach the streams since the peer was already flagged as attached.
Ensure remote camera streams are always attached and shown by:
- always propagating the current stream state on attachment
- refactoring the attachment pre-requisites away from a static boolean
to a required data + diff check (based on target and current
attached streams)
There's a very rare scenario where the client may crash if a video
publisher is released before the source stream had its inactivation
listener callback set up.
This adds a type check to the inactivation handler before trying to
clean it up.
There's an edge case in finnicky networks where ALG-like firewalls
tamper with USE-CANDIDATE STUN packets and, consequently, bork ICE-lite
connectivity establishment. The odd part is that client-side gathering
seems to complete if intermediate STUN bindings work (before the final
USE-CANDIDATE), which may cause the peer not to generate relay
candidates == connectivity fails.
This adds the `public.kurento.gatheringTimeout` option to forcefully extend
the candidate gathering window in peers that act as offerers. The
behavior is as follows: if the flag is set (ms), the peer will wait
either the gathering completed stage or, _at most_,
public.kurento.gatheringTimeout ms before proceeding with calls chained
to setLocalDescription.
This option is disabled by default and intentionally ommited from the
base settings.yml file as to not encourage its use. Don't use it unless
you know what you're doing :).
There are still a bunch of edge cases and issues with reconnection
scenarios for video:
- Signaling socket refuses to reconnect once maxRetries expire
- Race conditions on local stream attachment: local camera wouldn't be
correctly rendered _if_ the attached stream existed _without_ video
tracks yet
- Video tracks leak on local streams when replacing them (virtual bgs)
- Completely ignoring Meteor state when trying to reconnect cameras
- Streams aren't proactively stopped when the signaling socket dies
- Outbound request queues aren't isolated by stream nor are they
flushed when a newer peer with the same ID is created
- Server originated negotiation errors won't trigger a local peer
cleanup - thus leaving dangling peers that take way too long to
reconnect
This commit fixes or improves all of the aforementioned issues, +:
- Remove unused arguments in the peer (client->SFU) 'start' request
- Prevent crashes when trying to render video-list-items without user
data (which might happen on re-connections)
video-provider's current ping-pong is as good as nothing in 2.5+. We
were counting on Meteor's (and consequently the component's mount state)
before 2.5 to act as a "heartbeat" as far as the socket is concerned.
The ping-pong served only to sustain traffic for finnicky,
traffic-dependant firewall.
Since 2.5, the component's state is _kind of_ detached from Meteor's -
which means it won't unmount when Meteor disconnects. That causes the
video-provider websocket to lose its borrowed heartbeat and leads to a
bunch of reconnectiong inconsistencies, the worst of them being a stuck,
useless signaling socket that will cause cameras not to work until a
client refresh.
This commit does the following:
- Implements actual heartbeat checks to trigger signaling socket
reconnects when necessary, all within the scope of video-provider
- Remove borked, eons old 'offline'/'online' event handlers: they were
causing unnecessary camera drops AND causing video-provider to
generate a stuck signaling socket
- Properly catch WebSockets.send errors
The stream state change handler in video-list-item is using a component
state reference inside a DOM event callback - which means it is always
presuming `isStreamHealthy` is false (initial value). That prevents the
health state from actually transitioning when necessary (and
consequently rendering the reconnecting view in video-list item).
This commit removes the state-based transition check in the state change
handler and unifies the reconnecting view to use the username
placeholde (replacing the loading spinners).
