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feat: async peerstore backed by datastores (#1058)

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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
This commit is contained in:
Alex Potsides
2022-01-20 12:03:35 +00:00
committed by GitHub
parent 0a4dc54d08
commit 978eb3676f
94 changed files with 3263 additions and 4039 deletions
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2
examples/discovery-mechanisms/3.js
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@ -5,7 +5,7 @@ const Libp2p = require('../../')
const TCP = require('libp2p-tcp')
const Mplex = require('libp2p-mplex')
const { NOISE } = require('@chainsafe/libp2p-noise')
const Gossipsub = require('libp2p-gossipsub')
const Gossipsub = require('@achingbrain/libp2p-gossipsub')
const Bootstrap = require('libp2p-bootstrap')
const PubsubPeerDiscovery = require('libp2p-pubsub-peer-discovery')