Sync service complains about multiple connections from the same client

[alco]

Multiple people have reported this happen for different reasons.

Here's one such report:

When using the Dart client, after the app closes and Electric considers the client disconnected because of not responding to the ping, Electric will complain about multiple connections from the same client.
How is that possible? Maybe the service is not clearing the client_id connection that was closed due to the unresponded ping?

-- App disconnects, without gracefully closing the socket connection --
-- After a while, the server disconnects the client --

electric-1  | 16:00:17.172 pid=<0.4058.0> client_id=8c120869-9cc5-43cb-b8bb-c042e747e07a instance_id=4f15a93c-91b1-4f99-98da-3e916829b330 user_id=6bdd56fa-acd7-4349-8de8-7735859494bf [info] Client is not responding to ping, disconnecting

-- User reopens the app and reconnects --

electric-1  | 16:00:26.029 pid=<0.4063.0> [info] GET /ws
electric-1  | 16:00:26.030 pid=<0.4063.0> instance_id=4f15a93c-91b1-4f99-98da-3e916829b330 [info] Sent 101 in 343µs
electric-1  | 16:00:27.351 pid=<0.4063.0> client_id=8c120869-9cc5-43cb-b8bb-c042e747e07a instance_id=4f15a93c-91b1-4f99-98da-3e916829b330 [info] attempted multiple connections from the same client

Issue report on the Dart client with full client and server logs: SkillDevs/electric_dart#23

[linear]

VAX-1926 Sync service complains about multiple connections from the same client