init

.editorconfig

+# Editor configuration, see https://editorconfig.org
+root = true
+
+[*]
+charset = utf-8
+indent_style = space
+indent_size = 2
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.ts]
+quote_type = single
+
+[*.md]
+max_line_length = off
+trim_trailing_whitespace = false

.prettierrc.json

+{
+  "printWidth": 140,
+  "singleQuote": true
+}

main.coffee

-dgram = require 'dgram'
-assert = require 'assert'
-http = require 'http'
-
-Quality = require './quality'
-
-server_port = 495
-timeout = 10
-
-regions = [
-  {id: 0, name: "default"},
-  {id: 1, name: "ap"},
-  {id: 2, name: "cn"}
-]
-
-gateways = {
-  2: {
-    2: {server_id: 2, region_id: 2, delay: 0, jitter: 0, reliability: 1}
-  },
-  3: {
-    0: {server_id: 3, region_id: 0, delay: 0.1, jitter: 0, reliability: 1},
-    1: {server_id: 3, region_id: 1, delay: 0, jitter: 0, reliability: 1}
-  },
-  4: {
-    0: {server_id: 4, region_id: 0, delay: 0, jitter: 0, reliability: 1}
-  },
-  6: {
-    2: {server_id: 6, region_id: 2, delay: 0, jitter: 0, reliability: 1}
-  },
-  7: {
-    0: {server_id: 7, region_id: 0, delay: 0.1, jitter: 0, reliability: 1},
-    1: {server_id: 7, region_id: 1, delay: 0, jitter: 0, reliability: 1}
-  }
-}
-
-servers = {
-  2: {id: 2, inbound_cost: 0, outbound_cost: 0.8},
-  3: {id: 3, inbound_cost: 0, outbound_cost: 0.05},
-  4: {id: 4, inbound_cost: 0, outbound_cost: 0.03},
-  6: {id: 6, inbound_cost: 0, outbound_cost: 0.8},
-  7: {id: 7, inbound_cost: 0, outbound_cost: 1},
-}
-
-sequence = 0
-updating = null
-timeout_timer = null
-
-socket = dgram.createSocket('udp4')
-
-route_quality = (from, to, next_hop = servers[from].next_hop[to])->
-  assert next_hop?
-  assert from != next_hop
-  assert from != to
-
-  result = new Quality()
-
-  current = from
-  next = next_hop
-  route = [current, next]
-
-  while true
-    quality = servers[next].quality[current]
-    return Quality.unreachable if !quality or quality.reliability <= 0 # 网络不通，视为黑洞
-    result.concat(quality.delay, quality.jitter, quality.reliability, servers[current].outbound_cost + servers[next].inbound_cost)
-    return result if next == to # 到达
-
-    # 寻找下一跳
-    current = next
-    next = servers[current].next_hop[to]
-    assert next #to server_id 型路由，由于 server 两两相连，下一跳一定是存在的，最坏情况也是直达
-    if next in route # 环路
-      return Quality.unreachable
-    else
-      route.push next
-
-route_metric = (from, to, next_hop)->
-  route_quality(from, to, next_hop).metric()
-
-gateway_metric = (from, to, gateway)->
-  quality = gateways[gateway][to]
-  assert quality
-  result = new Quality(quality.delay, quality.jitter, quality.reliability, servers[gateway].outbound_cost + servers[gateway].inbound_cost)
-  if from != gateway
-    result.concat route_quality(from, gateway)
-    result.concat route_quality(gateway, from)
-  result.metric()
-
-update_route = (server, to)->
-  # 计算当前和最优路线
-  if to.name? # is region
-    type = 'gateway'
-    current_route = server[type][to.id]
-    if current_route
-      current_metric = gateway_metric(server.id, to.id, current_route)
-    else
-      current_metric = Number.POSITIVE_INFINITY
-    best_route = current_route
-    best_metric = current_metric
-    for index, route_server of servers when route_server.id != current_route and gateways[route_server.id]? and gateways[route_server.id][to.id]
-      metric = gateway_metric(server.id, to.id, route_server.id)
-      if metric < best_metric
-        best_route = route_server.id
-        best_metric = metric
-  else
-    assert(to.inbound_cost?) # is server
-    type = 'next_hop'
-    current_route = server[type][to.id]
-    assert(current_route) # 对于 to server 型路由，下一跳一定是存在的
-    current_metric = route_metric(server.id, to.id, current_route)
-    best_route = current_route
-    best_metric = current_metric
-    for index, route_server of servers when route_server.id != current_route and route_server.id != server.id # 对于 to server型路由，下一跳是自己是没有意义的
-      metric = route_metric(server.id, to.id, route_server.id)
-      if metric < best_metric
-        best_route = route_server.id
-        best_metric = metric
-
-  # 决定是否变更
-
-  now = new Date().getTime() / 1000
-  if current_route != best_route and (current_metric is Number.POSITIVE_INFINITY or (current_metric - best_metric - 0.01) * (now - server[type+'_updated_at'][to.id]) > 10)
-    console.log server[type+'_updated_at'][to.id],server[type+'_updated_at'], to.id
-    console.log "update ##{sequence}: #{type} server #{server.id} to #{to.id}: #{current_route}(#{current_metric}) -> #{best_route}(#{best_metric}) age #{now - server[type+'_updated_at'][to.id]}"
-    server[type][to.id] = best_route
-    server[type+'_updated_at'][to.id] = now
-    updating = setInterval ->
-      send_route server, to.id, best_route, type
-    , 1000
-    send_route server, to.id, best_route, type
-    timeout_timer = setTimeout ->
-      delete server.address
-      delete server.port
-      clearInterval(updating)
-      updating = null
-      console.log "server#{server.id} lost connection."
-    ,  timeout * 1000
-    return true
-
-  false
-
-send_route = (server, to, route, type)->
-  message = {sequence: sequence, to: to}
-  message[type] = route
-  message = JSON.stringify message
-  socket.send message, 0, message.length, server.port, server.address
-reset_route = (server)->
-  now = new Date().getTime() / 1000
-  server.quality = {}
-  server.next_hop = {}
-  server.next_hop_updated_at = {}
-  server.gateway = {}
-  server.gateway_updated_at = {}
-  for i,s of servers
-    server.next_hop[s.id] = s.id
-    server.next_hop_updated_at[s.id] = now
-  for region_id, region of regions when gateways[server.id]? and gateways[server.id][region_id]?
-    server.gateway[region_id] = server.id
-    server.gateway_updated_at[region_id] = now
-
-socket.on 'message', (message, rinfo) ->
-
-  message = JSON.parse(message)
-  server = servers[message.server_id]
-  return unless server?
-
-  if server.address != rinfo.address or server.port != rinfo.port # 重置 server 状态
-    server.address = rinfo.address
-    server.port = rinfo.port
-    console.log "server #{server.id} connected from #{server.address}:#{server.port}"
-    reset_route(server)
-
-  server.quality = message.quality
-
-  #console.log updating
-  if updating? and message.acknowledgement == sequence
-    #console.log "ack ##{sequence}: server#{server.id}"
-    clearInterval(updating)
-    clearTimeout(timeout_timer)
-    updating = null
-    sequence += 1
-
-  if !updating?
-    for i, server of servers when server.address?
-      for j, to_server of servers when server.id != to_server.id
-        return if update_route(server, to_server)
-      for j, to_region of regions
-        return if update_route(server, to_region)
-
-for server_id, server of servers
-  reset_route(server)
-
-socket.bind server_port
-
-http.createServer (req, res)->
-  res.writeHead 200, 'Content-Type': 'application/json'
-  res.end JSON.stringify(servers)
-.listen server_port
\ No newline at end of file

main.js

-// Generated by CoffeeScript 1.9.3
-(function() {
-  var Quality, assert, dgram, gateway_metric, gateways, http, regions, reset_route, route_metric, route_quality, send_route, sequence, server, server_id, server_port, servers, socket, timeout, timeout_timer, update_route, updating,
-    indexOf = [].indexOf || function(item) { for (var i = 0, l = this.length; i < l; i++) { if (i in this && this[i] === item) return i; } return -1; };
-
-  dgram = require('dgram');
-
-  assert = require('assert');
-
-  http = require('http');
-
-  Quality = require('./quality');
-
-  server_port = 495;
-
-  timeout = 10;
-
-  regions = [
-    {
-      id: 0,
-      name: "default"
-    }, {
-      id: 1,
-      name: "ap"
-    }, {
-      id: 2,
-      name: "cn"
-    }
-  ];
-
-  gateways = {
-    2: {
-      2: {
-        server_id: 2,
-        region_id: 2,
-        delay: 0,
-        jitter: 0,
-        reliability: 1
-      }
-    },
-    3: {
-      0: {
-        server_id: 3,
-        region_id: 0,
-        delay: 0.1,
-        jitter: 0,
-        reliability: 1
-      },
-      1: {
-        server_id: 3,
-        region_id: 1,
-        delay: 0,
-        jitter: 0,
-        reliability: 1
-      }
-    },
-    4: {
-      0: {
-        server_id: 4,
-        region_id: 0,
-        delay: 0,
-        jitter: 0,
-        reliability: 1
-      }
-    },
-    6: {
-      2: {
-        server_id: 6,
-        region_id: 2,
-        delay: 0,
-        jitter: 0,
-        reliability: 1
-      }
-    },
-    7: {
-      0: {
-        server_id: 7,
-        region_id: 0,
-        delay: 0.1,
-        jitter: 0,
-        reliability: 1
-      },
-      1: {
-        server_id: 7,
-        region_id: 1,
-        delay: 0,
-        jitter: 0,
-        reliability: 1
-      }
-    }
-  };
-
-  servers = {
-    2: {
-      id: 2,
-      inbound_cost: 0,
-      outbound_cost: 0.8
-    },
-    3: {
-      id: 3,
-      inbound_cost: 0,
-      outbound_cost: 0.05
-    },
-    4: {
-      id: 4,
-      inbound_cost: 0,
-      outbound_cost: 0.03
-    },
-    6: {
-      id: 6,
-      inbound_cost: 0,
-      outbound_cost: 0.8
-    },
-    7: {
-      id: 7,
-      inbound_cost: 0,
-      outbound_cost: 1
-    }
-  };
-
-  sequence = 0;
-
-  updating = null;
-
-  timeout_timer = null;
-
-  socket = dgram.createSocket('udp4');
-
-  route_quality = function(from, to, next_hop) {
-    var current, next, quality, result, route;
-    if (next_hop == null) {
-      next_hop = servers[from].next_hop[to];
-    }
-    assert(next_hop != null);
-    assert(from !== next_hop);
-    assert(from !== to);
-    result = new Quality();
-    current = from;
-    next = next_hop;
-    route = [current, next];
-    while (true) {
-      quality = servers[next].quality[current];
-      if (!quality || quality.reliability <= 0) {
-        return Quality.unreachable;
-      }
-      result.concat(quality.delay, quality.jitter, quality.reliability, servers[current].outbound_cost + servers[next].inbound_cost);
-      if (next === to) {
-        return result;
-      }
-      current = next;
-      next = servers[current].next_hop[to];
-      assert(next);
-      if (indexOf.call(route, next) >= 0) {
-        return Quality.unreachable;
-      } else {
-        route.push(next);
-      }
-    }
-  };
-
-  route_metric = function(from, to, next_hop) {
-    return route_quality(from, to, next_hop).metric();
-  };
-
-  gateway_metric = function(from, to, gateway) {
-    var quality, result;
-    quality = gateways[gateway][to];
-    assert(quality);
-    result = new Quality(quality.delay, quality.jitter, quality.reliability, servers[gateway].outbound_cost + servers[gateway].inbound_cost);
-    if (from !== gateway) {
-      result.concat(route_quality(from, gateway));
-      result.concat(route_quality(gateway, from));
-    }
-    return result.metric();
-  };
-
-  update_route = function(server, to) {
-    var best_metric, best_route, current_metric, current_route, index, metric, now, route_server, type;
-    if (to.name != null) {
-      type = 'gateway';
-      current_route = server[type][to.id];
-      if (current_route) {
-        current_metric = gateway_metric(server.id, to.id, current_route);
-      } else {
-        current_metric = Number.POSITIVE_INFINITY;
-      }
-      best_route = current_route;
-      best_metric = current_metric;
-      for (index in servers) {
-        route_server = servers[index];
-        if (!(route_server.id !== current_route && (gateways[route_server.id] != null) && gateways[route_server.id][to.id])) {
-          continue;
-        }
-        metric = gateway_metric(server.id, to.id, route_server.id);
-        if (metric < best_metric) {
-          best_route = route_server.id;
-          best_metric = metric;
-        }
-      }
-    } else {
-      assert(to.inbound_cost != null);
-      type = 'next_hop';
-      current_route = server[type][to.id];
-      assert(current_route);
-      current_metric = route_metric(server.id, to.id, current_route);
-      best_route = current_route;
-      best_metric = current_metric;
-      for (index in servers) {
-        route_server = servers[index];
-        if (!(route_server.id !== current_route && route_server.id !== server.id)) {
-          continue;
-        }
-        metric = route_metric(server.id, to.id, route_server.id);
-        if (metric < best_metric) {
-          best_route = route_server.id;
-          best_metric = metric;
-        }
-      }
-    }
-    now = new Date().getTime() / 1000;
-    if (current_route !== best_route && (current_metric === Number.POSITIVE_INFINITY || (current_metric - best_metric - 0.01) * (now - server[type + '_updated_at'][to.id]) > 10)) {
-      console.log(server[type + '_updated_at'][to.id], server[type + '_updated_at'], to.id);
-      console.log("update #" + sequence + ": " + type + " server " + server.id + " to " + to.id + ": " + current_route + "(" + current_metric + ") -> " + best_route + "(" + best_metric + ") age " + (now - server[type + '_updated_at'][to.id]));
-      server[type][to.id] = best_route;
-      server[type + '_updated_at'][to.id] = now;
-      updating = setInterval(function() {
-        return send_route(server, to.id, best_route, type);
-      }, 1000);
-      send_route(server, to.id, best_route, type);
-      timeout_timer = setTimeout(function() {
-        delete server.address;
-        delete server.port;
-        clearInterval(updating);
-        updating = null;
-        return console.log("server" + server.id + " lost connection.");
-      }, timeout * 1000);
-      return true;
-    }
-    return false;
-  };
-
-  send_route = function(server, to, route, type) {
-    var message;
-    message = {
-      sequence: sequence,
-      to: to
-    };
-    message[type] = route;
-    message = JSON.stringify(message);
-    return socket.send(message, 0, message.length, server.port, server.address);
-  };
-
-  reset_route = function(server) {
-    var i, now, region, region_id, results, s;
-    now = new Date().getTime() / 1000;
-    server.quality = {};
-    server.next_hop = {};
-    server.next_hop_updated_at = {};
-    server.gateway = {};
-    server.gateway_updated_at = {};
-    for (i in servers) {
-      s = servers[i];
-      server.next_hop[s.id] = s.id;
-      server.next_hop_updated_at[s.id] = now;
-    }
-    results = [];
-    for (region_id in regions) {
-      region = regions[region_id];
-      if (!((gateways[server.id] != null) && (gateways[server.id][region_id] != null))) {
-        continue;
-      }
-      server.gateway[region_id] = server.id;
-      results.push(server.gateway_updated_at[region_id] = now);
-    }
-    return results;
-  };
-
-  socket.on('message', function(message, rinfo) {
-    var i, j, server, to_region, to_server;
-    message = JSON.parse(message);
-    server = servers[message.server_id];
-    if (server == null) {
-      return;
-    }
-    if (server.address !== rinfo.address || server.port !== rinfo.port) {
-      server.address = rinfo.address;
-      server.port = rinfo.port;
-      console.log("server " + server.id + " connected from " + server.address + ":" + server.port);
-      reset_route(server);
-    }
-    server.quality = message.quality;
-    if ((updating != null) && message.acknowledgement === sequence) {
-      clearInterval(updating);
-      clearTimeout(timeout_timer);
-      updating = null;
-      sequence += 1;
-    }
-    if (updating == null) {
-      for (i in servers) {
-        server = servers[i];
-        if (!(server.address != null)) {
-          continue;
-        }
-        for (j in servers) {
-          to_server = servers[j];
-          if (server.id !== to_server.id) {
-            if (update_route(server, to_server)) {
-              return;
-            }
-          }
-        }
-        for (j in regions) {
-          to_region = regions[j];
-          if (update_route(server, to_region)) {
-            return;
-          }
-        }
-      }
-    }
-  });
-
-  for (server_id in servers) {
-    server = servers[server_id];
-    reset_route(server);
-  }
-
-  socket.bind(server_port);
-
-  http.createServer(function(req, res) {
-    res.writeHead(200, {
-      'Content-Type': 'application/json'
-    });
-    return res.end(JSON.stringify(servers));
-  }).listen(server_port);
-
-}).call(this);
-
-//# sourceMappingURL=main.js.map

main.js.map

-{
-  "version": 3,
-  "file": "main.js",
-  "sourceRoot": "",
-  "sources": [
-    "main.coffee"
-  ],
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+    }
+  }
+}

package.json

 {
   "name": "application-name",
-  "version": "0.0.1"
+  "version": "0.0.1",
+  "devDependencies": {
+    "@types/node": "^14.14.19"
+  },
+  "dependencies": {
+    "@types/lodash": "^4.14.172",
+    "lodash": "^4.17.21",
+    "ts-node": "^9.1.1",
+    "typescript": "^4.1.3"
+  }
 }

quality.coffee

-assert = require 'assert'
-
-module.exports = class Quality
-  constructor: (@delay=0, @jitter=0, @reliability=1, @cost=0)->
-
-  @unreachable: new Quality(0,0,0,0)
-
-
-  concat: (delay, jitter, reliability, cost)->
-    if delay instanceof Quality
-      @concat(delay.delay, delay.jitter, delay.reliability, delay.cost)
-    else
-      @delay += delay
-      @jitter += jitter
-      @reliability *= reliability
-      @cost += cost
-    this
-
-  # 若 reliability = 0，metric 应为 +∞
-  # 对于两条路线，同时连接任何一个相同的(reliability > 0的)线路，大小关系不变
-  metric: ()->
-    assert(@jitter >= 0)
-    assert(0 <= @reliability <= 1)
-    assert(@cost >= 0)
-    if @reliability == 0
-      Number.POSITIVE_INFINITY
-    else
-      @delay + (1 - @reliability) * 6 + @cost * 0.1

quality.js

-// Generated by CoffeeScript 1.9.3
-(function() {
-  var Quality, assert;
-
-  assert = require('assert');
-
-  module.exports = Quality = (function() {
-    function Quality(delay1, jitter1, reliability1, cost1) {
-      this.delay = delay1 != null ? delay1 : 0;
-      this.jitter = jitter1 != null ? jitter1 : 0;
-      this.reliability = reliability1 != null ? reliability1 : 1;
-      this.cost = cost1 != null ? cost1 : 0;
-    }
-
-    Quality.unreachable = new Quality(0, 0, 0, 0);
-
-    Quality.prototype.concat = function(delay, jitter, reliability, cost) {
-      if (delay instanceof Quality) {
-        this.concat(delay.delay, delay.jitter, delay.reliability, delay.cost);
-      } else {
-        this.delay += delay;
-        this.jitter += jitter;
-        this.reliability *= reliability;
-        this.cost += cost;
-      }
-      return this;
-    };
-
-    Quality.prototype.metric = function() {
-      var ref;
-      assert(this.jitter >= 0);
-      assert((0 <= (ref = this.reliability) && ref <= 1));
-      assert(this.cost >= 0);
-      if (this.reliability === 0) {
-        return Number.POSITIVE_INFINITY;
-      } else {
-        return this.delay + (1 - this.reliability) * 6 + this.cost * 0.1;
-      }
-    };
-
-    return Quality;
-
-  })();
-
-}).call(this);
-
-//# sourceMappingURL=quality.js.map

quality.js.map

-{
-  "version": 3,
-  "file": "quality.js",
-  "sourceRoot": "",
-  "sources": [
-    "quality.coffee"
-  ],
-  "names": [],
-  "mappings": ";AAAA;AAAA,MAAA;;EAAA,MAAA,GAAS,OAAA,CAAQ,QAAR;;EAET,MAAM,CAAC,OAAP,GAAuB;IACR,iBAAC,MAAD,EAAW,OAAX,EAAsB,YAAtB,EAAsC,KAAtC;MAAC,IAAC,CAAA,yBAAD,SAAO;MAAG,IAAC,CAAA,2BAAD,UAAQ;MAAG,IAAC,CAAA,qCAAD,eAAa;MAAG,IAAC,CAAA,uBAAD,QAAM;IAA5C;;IAEb,OAAC,CAAA,WAAD,GAAkB,IAAA,OAAA,CAAQ,CAAR,EAAU,CAAV,EAAY,CAAZ,EAAc,CAAd;;sBAGlB,MAAA,GAAQ,SAAC,KAAD,EAAQ,MAAR,EAAgB,WAAhB,EAA6B,IAA7B;MACN,IAAG,KAAA,YAAiB,OAApB;QACE,IAAC,CAAA,MAAD,CAAQ,KAAK,CAAC,KAAd,EAAqB,KAAK,CAAC,MAA3B,EAAmC,KAAK,CAAC,WAAzC,EAAsD,KAAK,CAAC,IAA5D,EADF;OAAA,MAAA;QAGE,IAAC,CAAA,KAAD,IAAU;QACV,IAAC,CAAA,MAAD,IAAW;QACX,IAAC,CAAA,WAAD,IAAgB;QAChB,IAAC,CAAA,IAAD,IAAS,KANX;;aAOA;IARM;;sBAYR,MAAA,GAAQ,SAAA;AACN,UAAA;MAAA,MAAA,CAAO,IAAC,CAAA,MAAD,IAAW,CAAlB;MACA,MAAA,CAAO,CAAA,CAAA,WAAK,IAAC,CAAA,YAAN,OAAA,IAAqB,CAArB,CAAP;MACA,MAAA,CAAO,IAAC,CAAA,IAAD,IAAS,CAAhB;MACA,IAAG,IAAC,CAAA,WAAD,KAAgB,CAAnB;eACE,MAAM,CAAC,kBADT;OAAA,MAAA;eAGE,IAAC,CAAA,KAAD,GAAS,CAAC,CAAA,GAAI,IAAC,CAAA,WAAN,CAAA,GAAqB,CAA9B,GAAkC,IAAC,CAAA,IAAD,GAAQ,IAH5C;;IAJM;;;;;AApBV"
-}
\ No newline at end of file

servers.json

+[
+  { "id": 2, "inbound_cost": 0, "outbound_cost": 0.8 },
+  { "id": 3, "inbound_cost": 0, "outbound_cost": 0.05 },
+  { "id": 4, "inbound_cost": 0, "outbound_cost": 0.03 },
+  { "id": 6, "inbound_cost": 0, "outbound_cost": 0.8 },
+  { "id": 7, "inbound_cost": 0, "outbound_cost": 1 }
+]

src/Quality.ts

+import assert from 'assert';
+
+export class Quality {
+  static unreachable = new Quality(0, 0, 0, 0);
+
+  constructor(public delay = 0, public jitter = 0, public reliability = 1, public cost = 0) {}
+
+  concat(delay: number, jitter: number, reliability: number, cost: number) {
+    this.delay += delay;
+    this.jitter += jitter;
+    this.reliability *= reliability;
+    this.cost += cost;
+    return this;
+  }
+
+  // 若 reliability = 0，metric 应为 +∞
+  // 对于两条路线，同时连接任何一个相同的(reliability > 0的)线路，大小关系不变
+  metric() {
+    assert(this.jitter >= 0);
+    assert(0 <= this.reliability && this.reliability <= 1);
+    assert(this.cost >= 0);
+    if (this.reliability === 0) {
+      return Infinity;
+    } else {
+      // 公式
+      return this.delay + (1 - this.reliability) * 6 + this.cost * 0.1;
+    }
+  }
+}

src/Router.ts

+import { RemoteInfo } from 'dgram';
+import { PeerQuality } from './protocol';
+import servers from '../servers.json';
+import assert from 'assert';
+import { Quality } from './Quality';
+
+export class Router {
+  static all: Router[] = servers.map(s => Object.assign(new Router(), s));
+
+  // config
+  id!: number;
+  inbound_cost!: number;
+  outbound_cost!: number;
+
+  //report
+  peers: Record<number, PeerQuality> = {};
+
+  // routing
+  next_hop: Map<Router, Router> = new Map();
+  rinfo?: RemoteInfo;
+
+  reset() {
+    this.peers = {};
+    for (const router of Router.all) {
+      this.next_hop.set(router, router);
+    }
+  }
+
+  lost() {
+    this.rinfo = undefined;
+    return console.log(`router ${this.id} lost connection.`);
+  }
+
+  route_quality(to: Router, next_hop = this.next_hop.get(to)!) {
+    assert(next_hop != null);
+    assert(this !== next_hop);
+    assert(this !== to);
+
+    const result = new Quality();
+
+    let current: Router = this;
+    let next = next_hop;
+    const route = [current, next];
+
+    while (true) {
+      const quality = next.peers[current.id];
+      if (!quality || quality.reliability <= 0) return Quality.unreachable; // 不通
+      result.concat(quality.delay, quality.jitter, quality.reliability, current.outbound_cost + current.inbound_cost);
+      if (next === to) return result; // 到达
+
+      // 寻找下一跳
+      current = next;
+      next = current.next_hop.get(to)!;
+      assert(next); //to server_id 型路由，由于 server 两两相连，下一跳一定是存在的，至少能直达
+      if (route.includes(next)) {
+        // 环路
+        return Quality.unreachable;
+      } else {
+        route.push(next);
+      }
+    }
+  }
+}
+
+for (const router of Router.all) {
+  router.reset();
+}

src/main.ts

+import dgram from 'dgram';
+import http from 'http';
+import peers from '../servers.json';
+import { ServerMessage } from './protocol';
+import assert from 'assert';
+import { Router } from './Router';
+import _ from 'lodash';
+
+const server_port = 495;
+const timeout = 10;
+
+let sequence = 0;
+let updating: any = null;
+let timeout_timer: any = null;
+
+export function send_route(router: Router, to: Router, next_hop: Router) {
+  const message = { sequence, to: to.id, next_hop: next_hop.id };
+  return socket.send(JSON.stringify(message), router.rinfo!.port, router.rinfo!.address);
+}
+
+
+const socket = dgram
+  .createSocket('udp4')
+  .on('message', function(message, rinfo) {
+    try {
+      const hello: ServerMessage = JSON.parse(message.toString());
+
+      assert(hello.id);
+      const router: Router = Router.all.find(r => r.id === hello.id)!;
+      assert(router);
+
+      if (_.isEqual(rinfo, router.rinfo)) {
+        router.rinfo = rinfo;
+        router.reset();
+      }
+
+      router.peers = hello.peers;
+
+      if (updating) {
+        if (hello.ack === sequence) {
+          clearInterval(updating);
+          clearTimeout(timeout_timer);
+          updating = null;
+          sequence++;
+        }
+        return;
+      }
+    } catch (e) {
+      console.warn(e);
+    }
+
+    for (const from of Router.all) {
+      for (const to of Router.all.filter(r => r.id !== from.id)) {
+        // 计算最优下一跳
+        const best_route = _.minBy(Router.all.filter(router => router.id !== from.id), (router) => from.route_quality(to, router).metric())!;
+
+        // 变更
+        if (from.next_hop.get(to) !== best_route) {
+          from.next_hop.set(to, best_route);
+          updating = setInterval(() => send_route(from, to, best_route), 1000);
+          send_route(from, to, best_route);
+          timeout_timer = setTimeout(function() {
+            from.lost();
+            clearInterval(updating);
+            updating = null;
+          }, timeout * 1000);
+          return;
+        }
+      }
+    }
+  });
+socket.bind(server_port);
+
+//web management api
+http
+  .createServer(function(req, res) {
+    res.writeHead(200, { 'Content-Type': 'application/json' });
+    return res.end(JSON.stringify(peers));
+  })
+  .listen(server_port);
+
+// setInterval(refresh(socket, routers), 1000)

src/protocol.ts

+export interface PeerQuality {
+  delay: number;
+  jitter: number;
+  reliability: number;
+}
+
+export interface ServerMessage {
+  id: number;
+  ack: number;
+  peers: PeerQuality[];
+}

tsconfig.json

+{
+  "compilerOptions": {
+    "module": "commonjs",
+    "target": "esnext",
+    "sourceMap": true,
+    "esModuleInterop": true,
+    "resolveJsonModule": true,
+    "strict": true
+  },
+  "exclude": ["node_modules"]
+}