We have a peerstore that keeps all data for all observed peers in memory with no eviction.
This is fine when you don't discover many peers but when using the DHT you encounter a significant number of peers so our peer storage grows and grows over time.
We have a persistent peer store, but it just periodically writes peers into the datastore to be read at startup, still keeping them in memory.
It also means a restart doesn't give you any temporary reprieve from the memory leak as the previously observed peer data is read into memory at startup.
This change refactors the peerstore to use a datastore by default, reading and writing peer info as it arrives. It can be configured with a MemoryDatastore if desired.
It was necessary to change the peerstore and *book interfaces to be asynchronous since the datastore api is asynchronous.
BREAKING CHANGE: `libp2p.handle`, `libp2p.registrar.register` and the peerstore methods have become async
BREAKING CHANGES:
top level types were updated, multiaddr@9.0.0 is used, dialer and keychain internal property names changed and connectionManager minPeers is not supported anymore
BREAKING CHANGE: all API methods with peer-info parameters or return values were changed. You can check the API.md document, in order to check the new values to use
* docs: add initial notes on stats
* feat: initial refactor of stats to metrics
* feat: add support for placeholder metrics
This is helpful for tracking metrics prior to knowing the remote peers id
* fix: add metrics tests and fix issues
* fix: always clear the dial timeout timer
* docs: add metrics to api doc
* chore: apply suggestions from code review
Co-Authored-By: Vasco Santos <vasco.santos@moxy.studio>
* docs: update metrics docs
* fix: call metrics.onDisconnect
* docs(config): add example headers so they appear in the TOC
* docs(config): add metrics configuration
* docs(relay): fix relay configuration docs
* refactor: add dialing over relay support
* chore: fix lint
* fix: dont clear listeners on close
* fix: if dial errors already have codes, just rethrow them
* fix: clear the registrar when libp2p stops
* fix: improve connection maintenance with circuit
* chore: correct feedback
* test: use chai as promised
* test(fix): reset multiaddrs on dial test
