git ssb

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'use strict'
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var pull = require('pull-stream')
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var Notify = require('pull-notify')
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var mdm = require('mdmanifest')
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var valid = require('../../lib/validators')
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var apidoc = require('../../lib/apidocs').gossip
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var u = require('../../lib/util')
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var ref = require('ssb-ref')
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var ping = require('pull-ping')
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var stats = require('statistics')
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var Schedule = require('./schedule')
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var Init = require('./init')
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var AtomicFile = require('atomic-file')
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var path = require('path')
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var deepEqual = require('deep-equal')
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function isFunction (f) {
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  return 'function' === typeof f
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}
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function stringify(peer) {
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  return [peer.host, peer.port, peer.key].join(':')
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}
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/*
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Peers : [{
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  key: id,
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  host: ip,
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  port: int,
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  //to be backwards compatible with patchwork...
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  announcers: {length: int}
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  source: 'pub'|'manual'|'local'
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}]
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*/
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module.exports = {
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  name: 'gossip',
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  version: '1.0.0',
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  manifest: mdm.manifest(apidoc),
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  permissions: {
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    anonymous: {allow: ['ping']}
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  },
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  init: function (server, config) {
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    var notify = Notify()
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    var conf = config.gossip || {}
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    var home = ref.parseAddress(server.getAddress())
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    var stateFile = AtomicFile(path.join(config.path, 'gossip.json'))
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    //Known Peers
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    var peers = []
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    function getPeer(id) {
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      return u.find(peers, function (e) {
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        return e && e.key === id
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      })
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    }
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    var timer_ping = 5*6e4
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    var gossip = {
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      wakeup: 0,
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      peers: function () {
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        return peers
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      },
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      get: function (addr) {
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        addr = ref.parseAddress(addr)
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        return u.find(peers, function (a) {
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          return (
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            addr.port === a.port
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            && addr.host === a.host
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            && addr.key === a.key
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          )
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        })
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      },
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      connect: valid.async(function (addr, cb) {
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        addr = ref.parseAddress(addr)
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        if (!addr || typeof addr != 'object')
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          return cb(new Error('first param must be an address'))
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        if(!addr.key) return cb(new Error('address must have ed25519 key'))
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        // add peer to the table, incase it isn't already.
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        gossip.add(addr, 'manual')
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        var p = gossip.get(addr)
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        if(!p) return cb()
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        p.stateChange = Date.now()
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        p.state = 'connecting'
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        server.connect(p, function (err, rpc) {
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          if (err) {
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            p.state = undefined
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            p.failure = (p.failure || 0) + 1
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            p.stateChange = Date.now()
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            notify({ type: 'connect-failure', peer: p })
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            server.emit('log:info', ['SBOT', p.host+':'+p.port+p.key, 'connection failed', err.message || err])
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            p.duration = stats(p.duration, 0)
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            return (cb && cb(err))
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          }
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          else {
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            p.state = 'connected'
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            p.failure = 0
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          }
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          cb && cb(null, rpc)
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        })
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      }, 'string|object'),
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      disconnect: valid.async(function (addr, cb) {
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        var peer = this.get(addr)
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        peer.state = 'disconnecting'
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        peer.stateChange = Date.now()
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        if(!peer || !peer.disconnect) cb && cb()
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        else peer.disconnect(null, function (err) {
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          peer.stateChange = Date.now()
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        })
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      }, 'string|object'),
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      changes: function () {
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        return notify.listen()
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      },
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      //add an address to the peer table.
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      add: valid.sync(function (addr, source) {
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        addr = ref.parseAddress(addr)
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        if(!ref.isAddress(addr))
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          throw new Error('not a valid address:' + JSON.stringify(addr))
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        // check that this is a valid address, and not pointing at self.
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        if(addr.key === home.key) return
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        if(addr.host === home.host && addr.port === home.port) return
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        var f = gossip.get(addr)
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        if(!f) {
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          // new peer
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          addr.source = source
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          addr.announcers = 1
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          addr.duration = addr.duration || null
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          peers.push(addr)
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          notify({ type: 'discover', peer: addr, source: source || 'manual' })
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          return addr
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        } else if (source === 'friends' || source === 'local') {
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          // this peer is a friend or local, override old source to prioritize gossip
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          f.source = source
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        }
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        //don't count local over and over
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        else if(f.source != 'local')
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          f.announcers ++
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        return f
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      }, 'string|object', 'string?'),
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      ping: function (opts) {
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        var timeout = config.timers && config.timers.ping || 5*60e3
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        //between 10 seconds and 30 minutes, default 5 min
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        timeout = Math.max(10e3, Math.min(timeout, 30*60e3))
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        return ping({timeout: timeout})
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      },
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      reconnect: function () {
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        for(var id in server.peers)
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          if(id !== server.id) //don't disconnect local client
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            server.peers[id].forEach(function (peer) {
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              peer.close(true)
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            })
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        return gossip.wakeup = Date.now()
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      }
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    }
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    Schedule (gossip, config, server)
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    Init (gossip, config, server)
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    //get current state
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    server.on('rpc:connect', function (rpc, isClient) {
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      var peer = getPeer(rpc.id)
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      //don't track clients that connect, but arn't considered peers.
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      //maybe we should though?
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      if(!peer) return
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      console.log('Connected', stringify(peer))
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      //means that we have created this connection, not received it.
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      peer.client = !!isClient
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      peer.state = 'connected'
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      peer.stateChange = Date.now()
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      peer.disconnect = function (err, cb) {
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        if(isFunction(err)) cb = err, err = null
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        rpc.close(err, cb)
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      }
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      if(isClient) {
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        //default ping is 5 minutes...
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        var pp = ping({serve: true, timeout: timer_ping}, function (_) {})
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        peer.ping = {rtt: pp.rtt, skew: pp.skew}
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        pull(
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          pp,
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          rpc.gossip.ping({timeout: timer_ping}, function (err) {
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            if(err.name === 'TypeError') peer.ping.fail = true
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          }),
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          pp
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        )
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      }
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      rpc.on('closed', function () {
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        console.log('Disconnected', stringify(peer))
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        //track whether we have successfully connected.
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        //or how many failures there have been.
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        var since = peer.stateChange
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        peer.stateChange = Date.now()
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//        if(peer.state === 'connected') //may be "disconnecting"
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        peer.duration = stats(peer.duration, peer.stateChange - since)
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//        console.log(peer.duration)
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        peer.state = undefined
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        notify({ type: 'disconnect', peer: peer })
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        server.emit('log:info', ['SBOT', rpc.id, 'disconnect'])
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      })
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      notify({ type: 'connect', peer: peer })
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    })
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    var last
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    stateFile.get(function (err, ary) {
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      last = ary || []
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      if(Array.isArray(ary))
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        ary.forEach(function (v) {
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          delete v.state
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          // don't add local peers (wait to rediscover)
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          if(v.source !== 'local') {
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            gossip.add(v, 'stored')
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          }
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        })
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    })
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    var int = setInterval(function () {
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      var copy = JSON.parse(JSON.stringify(peers))
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      copy.forEach(function (e) {
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        delete e.state
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      })
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      if(deepEqual(copy, last)) return
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      last = copy
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      stateFile.set(copy, function(err) {
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        if (err) console.log(err)
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      })
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    }, 10*1000)
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    if(int.unref) int.unref()
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    return gossip
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  }
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}
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