init

.gitignore

+/.idea/
\ No newline at end of file

main.coffee

+dgram = require 'dgram'
+assert = require 'assert'
+http = require 'http'
+
+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')
+
+caculate_metric = (delay, jitter, reliability, cost)->
+  assert(jitter >= 0)
+  assert(0 <= reliability <= 1, "reliability: #{reliability}")
+  assert(cost >= 0)
+
+  delay + (1 - reliability) * 6 + cost * 0.1
+
+route_metric = (server_id, from, to, next_hop)->
+
+  #console.log "route_metric(#{server_id}, #{from}, #{to}, #{next_hop})"
+
+
+  # delay 由于涉及时差问题，对内、对外、补偿权重必须是一致的。
+  # 其他几个变量对内、对外权重可以不一致。
+
+  delay = 0
+  internal_reliability = 1
+  internal_jitter = 0
+  internal_cost = 0
+
+  external_reliability = 1
+  external_jitter = 0
+  external_cost = 0
+
+  current = server_id
+  next = next_hop
+  route = [current, next]
+
+  # 正向路由
+  while true
+    if next == 0 # from server_id to region_id 型路由到达出口
+      assert(from != 0)
+      quality = gateways[current][to]
+      return Number.POSITIVE_INFINITY if !quality or quality.reliability <= 0 # 网络不通，视为黑洞
+      #console.log '-gateway-', current, to, quality
+      delay += quality.delay
+      external_reliability *= Math.sqrt(quality.reliability)
+      external_jitter += quality.jitter / 2
+      external_cost += servers[current].outbound_cost
+      internal_reliability *= Math.sqrt(quality.reliability)
+      internal_jitter += quality.jitter / 2
+      internal_cost += servers[current].inbound_cost
+      if current == from # 出口直达
+        return caculate_metric(delay, internal_jitter + external_jitter, internal_reliability * external_reliability, internal_cost + external_cost)
+      next = servers[current].routes[0][from]
+      route = [current, next]
+      while true # 计算返程路线
+        # 计算网络质量
+        quality = servers[next].quality[current]
+        return Number.POSITIVE_INFINITY if !quality or quality.reliability <= 0 # 网络不通，视为黑洞
+        #console.log '-2-', current, next, quality
+        delay += quality.delay
+        internal_jitter += quality.jitter
+        internal_reliability *= quality.reliability
+        internal_cost += servers[current].outbound_cost + servers[next].inbound_cost
+        # 寻找下一跳
+        if next == from # 往返路径结束
+          return caculate_metric(delay, internal_jitter + external_jitter, internal_reliability * external_reliability, internal_cost + external_cost)
+        else
+          current = next
+          next = servers[current].routes[0][from]
+          assert(next?) # 返程的目标是server，相当于 from all 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 Number.POSITIVE_INFINITY
+          else
+            route.push next
+    else
+      # 计算网络质量
+      quality = servers[next].quality[current]
+      return Number.POSITIVE_INFINITY if !quality or quality.reliability <= 0 # 网络不通，视为黑洞
+      #console.log '-3-', current, next, quality
+      delay += quality.delay
+
+      if from == 0 # 对内
+        internal_reliability *= quality.reliability
+        internal_jitter += quality.jitter
+        internal_cost += servers[current].outbound_cost + servers[next].inbound_cost
+        if next == to
+          return caculate_metric(delay, internal_jitter + external_jitter, internal_reliability * external_reliability, internal_cost + external_cost)
+      else
+        external_reliability *= quality.reliability
+        external_jitter += quality.jitter
+        external_cost += servers[current].outbound_cost + servers[next].inbound_cost
+
+      # 寻找下一跳
+      current = next
+      next = servers[current].routes[from][to]
+      if next?
+        if next in route # 环路
+          return Number.POSITIVE_INFINITY
+        else
+          route.push next
+      else
+        assert(from != 0) # from all 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
+        return Number.POSITIVE_INFINITY # 对于from server_id to region 型路由，如果下一跳不存在，意味着出口没有已知路线可达，是黑洞
+
+
+  # 返程 (下行) 路由
+  #console.log '-2-', next
+
+
+update_route = (server, from, to)->
+  current_next_hop = server.routes[from][to]
+
+  # 计算当前路线
+  if current_next_hop?
+    current_metric = route_metric(server.id, from, to, current_next_hop)
+  else
+    assert(from != 0) # from all 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
+    current_metric = Number.POSITIVE_INFINITY # 对于from server_id to region 型路由，如果下一跳不存在，意味着出口没有已知路线可达，是黑洞
+
+  # 计算更优路线
+  best_next_hop = current_next_hop
+  best_metric = current_metric
+
+  for index, next_hop_server of servers when next_hop_server.id != current_next_hop and next_hop_server != server and next_hop_server.id != from
+    #console.log parseInt(next_hop), server.id
+    #console.log next_hop,current_next_hop
+    metric = route_metric(server.id, from, to, next_hop_server.id)
+    if metric < best_metric
+      best_next_hop = next_hop_server.id
+      best_metric = metric
+  if from != 0
+    metric = route_metric(server.id, from, to, 0)
+    if metric < best_metric
+      best_next_hop = 0
+      best_metric = metric
+
+  now = new Date().getTime() / 1000
+  if current_next_hop != best_next_hop and (current_metric is Number.POSITIVE_INFINITY or (current_metric - best_metric - 0.01) * (now - server.updated_at[from][to]) > 10)
+    console.log "update ##{sequence}: server#{server.id} from #{from} to #{to} next hop #{current_next_hop}(#{current_metric}) -> #{best_next_hop}(#{best_metric})"
+    server.routes[from][to] = best_next_hop
+    server.updated_at[from][to] = now
+    updating = setInterval ->
+      send_route(server, from, to, best_next_hop)
+    , 1000
+    send_route(server, from, to, best_next_hop)
+    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, from, to, next_hop)->
+  message = {sequence: sequence, from: from, to: to, next_hop: next_hop}
+  if server == from
+    gateway = server
+    while next_hop != 0
+      gateway = next_hop
+      next_hop = servers[gateway].routes[from][to]
+    message.gateway = gateway
+  message = JSON.stringify message
+  socket.send message, 0, message.length, server.port, server.address
+reset_route = (server)->
+  now = new Date().getTime() / 1000
+  server.quality = {}
+  # 目标地址是 server 的 from all to server_id 型路由, routes[0][server_id], 对于直连目标节点的，next_hop = server_id
+  # 目标地址是 region 的 from server_id to region_id 型路由, routes[server_id][region_id], 对于直连出口的，next_hop = 0
+  server.routes = {}
+  server.updated_at = {}
+  server.routes[0] = {}
+  server.updated_at[0] = {}
+  for i,s of servers
+    server.routes[0][i] = parseInt(i)
+    server.updated_at[0][i] = now
+    server.routes[i] = {}
+    server.updated_at[i] = {}
+    for region_id, region of regions when gateways[server.id]? and gateways[server.id][region_id]?
+      server.routes[i][region_id] = 0
+      server.updated_at[i][region_id] = now
+
+socket.on 'message', (message, rinfo) ->
+
+  message = JSON.parse(message)
+  #console.log 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 server_id, server of servers when server.address?
+      for to of servers when to != server_id
+        return if update_route(server, 0, parseInt(to))
+      for from of servers
+        for region in regions
+          return if update_route(server, parseInt(from), region.id)
+
+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.map

+{
+  "version": 3,
+  "file": "main.js",
+  "sourceRoot": "",
+  "sources": [
+    "main.coffee"
+  ],
+  "names": [],
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+}
\ No newline at end of file

package.json

+{
+  "name": "application-name",
+  "version": "0.0.1"
+}