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Modularize storage - Use cookie instead of timestamp
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,60 @@ | ||
| 'use strict' | ||
|
|
||
| class NS { | ||
| constructor (name, que) { // name is a utf8 string | ||
| this.name = name | ||
| this.hexName = Buffer.from(name).toString('hex') // needed to prevent queue-dos attacks | ||
| this.que = que | ||
| this.id = {} | ||
| this.sorted = [] | ||
| } | ||
| addPeer (pi, ts, ttl, isOnline) { // isOnline returns a bool if the rpc connection still exists | ||
| const id = pi.id.toB58String() | ||
| this.id[id] = {pi, ts, ttl} | ||
| if (ttl) { | ||
| let expireAt = ts + ttl * 1000 | ||
| this.id[id].online = () => Date.now() >= expireAt | ||
| } else { | ||
| this.id[id].online = isOnline | ||
| } | ||
| this.update() | ||
| } | ||
| removePeer (pid) { | ||
| delete this.id[pid] | ||
| this.update() | ||
| } | ||
| update () { | ||
| this.que.add('sort@' + this.hexName, () => { | ||
| this.sorted = Object.keys(this.id).map(id => { return {id, ts: this.id[id].ts} }).sort((a, b) => a.ts - b.ts) | ||
| }) | ||
| } | ||
| getPeers (cookie, limit, ownId) { | ||
| cookie = cookie.length ? parseInt(cookie.toString(), 10) : 0 | ||
| let p = this.sorted.filter(p => p.ts > cookie && p.id !== ownId).slice(0, limit).map(p => this.id[p.id]) | ||
| let newCookie | ||
| if (p.length) { | ||
| newCookie = Buffer.from(p[p.length - 1].ts.toString()) | ||
| } else { | ||
| newCookie = Buffer.from('') | ||
| } | ||
| return {cookie: newCookie, peers: p} | ||
| } | ||
| gc () { | ||
| return Object.keys(this.id).filter(k => !this.id[k].online()).map(k => delete this.id[k]).length | ||
| } | ||
| get useless () { | ||
| return !Object.keys(this.id).length | ||
| } | ||
| } | ||
|
|
||
| class BasicStore { | ||
| constructor (main) { | ||
| this.main = main | ||
| } | ||
| create (name) { | ||
| return new NS(name, this.main.que) | ||
| } | ||
| } | ||
|
|
||
| module.exports = BasicStore | ||
| module.exports.NS = NS |