* Switch to lower-level mdns library for more control during debugging
* Use avahi-browse with host avahi-daemon to circumvent musl (alpline) issues with mdns resolution https://johnsiu.com/blog/alpine-linux/
* Refactor credit parsing into two stages: joiner separation and credits parsing
* Break credit parsing into wrapped vs. non-wrapped for simpler regexes
* Implement suffix matching after credits
* Add tests for wrapped vs. non-wrapped credits and with suffixes
* Implement type/guard for node network error
* Refactor auth in sources & clients to flag if error is network or api based
* Retry auth on heartbeat if auth failure was caused by network
* Implement initial tests for testing client auth
* Fix tests hanging due to running async functions
* Move scrobble checking into client (out of client manager) for single responsibility
* Implement scrobble queue/deadletter
* Less chance of duplicate processing since sources can't scrobble concurrently
* Better throttling since multiple sources can't scrobble concurrently
* When scrobbling fails we can retry on delay just like polling and *keep* the failed scrobbles for later retry rather than dropping them
* Deadletter (to be fully implemented) for scrobbles that fail multiple times or are signalled as not upstream api issues by client
* Check for stale/orphaned/dead in independent loop so they are not dependent on getting source updates to update
* Only emit events if player state has updated
Addresses #5 and #65 -- in default config use-cases where:
* request/polling retry attempts are low
* source was initially OK (auth OK, initial communication OK)
* and there is a non-auth related *upstream* communication issue
there is no fallback path for restarting source polling after upstream has normalized.
This feat implements a scheduled heartbeat task that attempts to restart polling every 20 minutes if this scenario is valid so that a good source config will recover without user intervention.
* Rename to backend to better reflect what it is
* Move server functionality out of entry file and into own server subdirectory
* Rename 'apis' folder to 'vendor' to reflect usage and move into common
* Rename 'clients' folder to 'scrobblers' reflect usage and prevent ambiguity with client CRA folder
