{
    "android": {
        "message": "消息体",
        "title": "消息标题",
        "payload": {...}
    },
    "apn": {
        "alert": {
            "body": "消息体",
            "title": "消息标题"
        }
    },
    "id": "rOW60mpqNLxY",
    "timestamp": 1511411873267
}

2017-11-23 12:37:53 worker:07 D/ArrivalStats addArrivalInfo  rOW60mpqNLxY { '$inc': { target_android: 1 },
  '$set':
   { notification: { body: '消息体', title: '消息标题' },
     timeStart: 1511411873285,
     ttl: 0,
     expireAt: 1514003873285,
     type: 'pushMany' },
  '$setOnInsert': { __v: 0 } } { ok: 0, n: 0, nModified: 0 } { MongooseError: Cast to string failed for value "{ body: '消息体', title: '消息标题' }" at path "notification"
    at CastError (/home/webedit/socket.io-push/push-server/node_modules/mongoose/lib/error/cast.js:26:11)
    at SchemaString.cast (/home/webedit/socket.io-push/push-server/node_modules/mongoose/lib/schema/string.js:458:9)
    at SchemaString.SchemaType._castForQuery (/home/webedit/socket.io-push/push-server/node_modules/mongoose/lib/schematype.js:1064:15)
    at SchemaString.SchemaType.castForQueryWrapper (/home/webedit/socket.io-push/push-server/node_modules/mongoose/lib/schematype.js:1019:17)
    at castUpdateVal (/home/webedit/socket.io-push/push-server/node_modules/mongoose/lib/services/query/castUpdate.js:308:19)
    at walkUpdatePath (/home/webedit/socket.io-push/push-server/node_modules/mongoose/lib/services/query/castUpdate.js:150:20)
    at castUpdate (/home/webedit/socket.io-push/push-server/node_modules/mongoose/lib/services/query/castUpdate.js:71:18)
    at model.Query._castUpdate (/home/webedit/socket.io-push/push-server/node_modules/mongoose/lib/query.js:2902:10)
    at _update (/home/webedit/socket.io-push/push-server/node_modules/mongoose/lib/query.js:2752:23)
    at model.Query.Query.update (/home/webedit/socket.io-push/push-server/node_modules/mongoose/lib/query.js:2547:10)
    at _update (/home/webedit/socket.io-push/push-server/node_modules/mongoose/lib/model.js:2453:16)
    at Function.update (/home/webedit/socket.io-push/push-server/node_modules/mongoose/lib/model.js:2369:10)
    at ArrivalStats.addArrivalInfo (/home/webedit/socket.io-push/push-server/lib/stats/arrivalStats.js:37:26)
    at ArrivalStats.addPushMany (/home/webedit/socket.io-push/push-server/lib/stats/arrivalStats.js:81:10)
    at NotificationService.sendByDevices (/home/webedit/socket.io-push/push-server/lib/service/notificationService.js:35:22)
    at ApiRouter.sendNotificationByDevices (/home/webedit/socket.io-push/push-server/lib/service/apiRouter.js:162:30)
  message: 'Cast to string failed for value "{ body: \'消息体\', title: \'消息标题\' }" at path "notification"',
  name: 'CastError',
  stringValue: '"{ body: \'消息体\', title: \'消息标题\' }"',
  kind: 'string',
  value: { body: '消息体', title: '消息标题' },
  path: 'notification',
  reason: undefined }

pushClient.on('push', function (data) {
           addChatMessage(data);
       })

  let spawn = (processType, count) => {
    if (count > 0) {
      const env = {
        processType,
        ip
      };
      for (let i = 0; i < count; i++) {
        const worker = cluster.fork(env);
        worker.on('exit', (code, signal) => {
          logger.error('worker(%s) exit, code:%s, signal:%s', worker.id, code, signal);
          setTimeout(() => {
            logger.info('respanw worker');
            spawn(env);
          }, 5000);
        });
      }
    }
  }

8/7/2017, 9:11:20 PM worker:03 I/Mongo query  socket-io-push_devices findAndModify { _id: 'v82ytThWiweosl60' }
8/7/2017, 9:11:20 PM worker:03 D/DeviceService connect  { id: 'v82ytThWiweosl60',
  version: 1,
  platform: 'browser',
  topics: [ 'noti', 'chatRoom' ],
  lastUnicastId: null,
  lastPacketIds: {} } { _id: 'v82ytThWiweosl60',
  __v: 0,
  updateTime: 2017-08-07T13:11:20.967Z,
  socketId: '192.168.70.31:6QdyZ84e-AzMsBmsAAAE',
  createTime: 2017-08-07T13:11:11.121Z,
  tags: [] } null
8/7/2017, 9:11:21 PM worker:01 I/Mongo query  socket-io-push_sessions update { _id: '192.168.70.31:1' }
8/7/2017, 9:11:21 PM worker:02 I/Mongo query  socket-io-push_sessions update { _id: '192.168.70.31:2' }
8/7/2017, 9:11:21 PM worker:01 E/TopicOnline topicOnline.update  { MongooseError: Path "_id" is not in schema, strict mode is `true`, and upsert is `true`.
    at StrictModeError (/Users/joecwu/node_modules/mongoose/lib/error/strict.js:21:11)
    at cast (/Users/joecwu/node_modules/mongoose/lib/cast.js:199:17)
    at model.Query.Query.cast (/Users/joecwu/node_modules/mongoose/lib/query.js:3103:12)
    at model.Query.Query._castConditions (/Users/joecwu/node_modules/mongoose/lib/query.js:1144:10)
    at model.Query.Query._execUpdate (/Users/joecwu/node_modules/mongoose/lib/query.js:2321:8)
    at /Users/joecwu/node_modules/kareem/index.js:250:8
    at /Users/joecwu/node_modules/kareem/index.js:23:7
    at _combinedTickCallback (internal/process/next_tick.js:131:7)
    at process._tickCallback (internal/process/next_tick.js:180:9)
  message: 'Path "_id" is not in schema, strict mode is `true`, and upsert is `true`.',
  name: 'StrictModeError',
  path: '_id' }