task(persistence): implement persisting sessions when delivery fails

[rich-bugsnag]

Goal

implement persisting sessions when delivery fails

Design

The flow is as follows.
1: When a session is recorded it gets added to a list of pending session payloads in memory
2: If the session is sent successfully then the pending session is removed
3: If the sessio fails to send it is written to disk, then on next startup or when the app comes back into focus we try and send it again

Changeset

• Added FileManager class
• Added config value MaxPersistedSessions and pass the value through to Android and Cocoa
• Display MaxPersistedSessions in the bugsnag config unity window
• Try sending cached payloads on launch and when app regains focus

Testing

Added CI tests for Windows and WebGL

[nickdowell]

Was persisting sessions prior to sending a deliberate design decision?

We not too long ago changed the Cocoa notifier to only persist sessions if sending failed, in order to reduce disk activity...

[rich-bugsnag]

Was persisting sessions prior to sending a deliberate design decision?

We not too long ago changed the Cocoa notifier to only persist sessions if sending failed, in order to reduce disk activity...

Good thinking, i changed to so that it now has a list of pending sessions saved in memory, and it only writes them to disk if they fail to send 👍