Question

我这里有这个Node应用程序，它向api发出请求以获取一些库存数据，循环遍历该库存数据，然后每5分钟将其写入Mongo数据库。我正在将PM2作为服务在Digital Ocean服务器上运行它。但是，让它运行了一天之后，我在数据库中看不到任何数据。我没有看到任何迹象表明该服务未运行或有任何错误，所以我想知道是否可能是因为PM 2服务无法写入数据库？也许是港口问题？任何指导都很棒！

// -- Dependancies --
// Request and MongoDB
const request = require('request');
const mongoose = require('mongoose');
const Schema = mongoose.Schema;


// Connect to database
mongoose.connect('mongodb://127.0.0.1:27017/stock-test')
    .then(() => {
        console.log('connected');
    })
    .catch(err => {
        console.error(err);
    });


// Setup stockMoment Schema
const StockMomentSchema = new Schema({
    symbol: String,
    price: Number,
    size: Number,
    time: {type: Date, default: Date.now}
});


// Create stockMoment model
StockMoment = mongoose.model('stockMoment', StockMomentSchema, 'stockPriceData');


// Setup Variables
const d = new Date();
let day = d.getDay()
let hour = d.getHours();



// Check time, run getMarketData function if market is open
function makeRequest() {
    if(day >= 1 && day <= 5) {
        if(hour >= 11 && hour <= 16) {
            getMarketData();
        }
    }
}


// Run request to get data, store data in MongoDB database
function getMarketData() {
    request({
        url: 'https://api.iextrading.com/1.0/tops/last',
        json: true
    }, (err, res, body) => {
        if(err) {
            return console.error(err);
        }

        for(let i = 0; i < body.length; i++) {
            const stockMoment = new StockMoment({
                symbol: body[i].symbol,
                price: body[i].price,
                size: body[i].size,
                time: body[i].time,
            });
            stockMoment.save((err) => {
                if(err) return handleError(err);
                console.log('Saved!', i);
            });
            console.log(body[i]);
        }
    });
}


setInterval(makeRequest, 300000);

PM2日志：

PM2        | [2018-08-27T23:05:42.936Z] PM2 log: RPC socket file      : /home/evadmin/.pm2/rpc.sock
PM2        | [2018-08-27T23:05:42.937Z] PM2 log: BUS socket file      : /home/evadmin/.pm2/pub.sock
PM2        | [2018-08-27T23:05:42.937Z] PM2 log: Application log path : /home/evadmin/.pm2/logs
PM2        | [2018-08-27T23:05:42.937Z] PM2 log: Process dump file    : /home/evadmin/.pm2/dump.pm2
PM2        | [2018-08-27T23:05:42.937Z] PM2 log: Concurrent actions   : 2
PM2        | [2018-08-27T23:05:42.937Z] PM2 log: SIGTERM timeout      : 1600
PM2        | [2018-08-27T23:05:42.937Z] PM2 log: ===============================================================================
PM2        | [2018-08-27T23:05:42.972Z] PM2 log: Starting execution sequence in -fork mode- for app name:priceTimeSeries id:0
PM2        | [2018-08-27T23:05:42.977Z] PM2 log: App name:priceTimeSeries id:0 online
PM2        | [2018-08-27T23:08:02.026Z] PM2 log: Process 0 in a stopped status, starting it
PM2        | [2018-08-27T23:08:02.027Z] PM2 log: Stopping app:priceTimeSeries id:0
PM2        | [2018-08-27T23:08:02.042Z] PM2 log: App [priceTimeSeries] with id [0] and pid [1927], exited with code [0] via signal [SIGINT]
PM2        | [2018-08-27T23:08:02.139Z] PM2 log: pid=1927 msg=process killed
PM2        | [2018-08-27T23:08:02.140Z] PM2 log: Starting execution sequence in -fork mode- for app name:priceTimeSeries id:0
PM2        | [2018-08-27T23:08:02.145Z] PM2 log: App name:priceTimeSeries id:0 online

/home/evadmin/.pm2/logs/priceTimeSeries-error.log last 15 lines:
0|priceTim | (node:1927) DeprecationWarning: current URL string parser is deprecated, and will be removed in a future version. To use the new parser, pass option { useNewUrlParser: true } to MongoClient.connect.
0|priceTim | (node:2001) DeprecationWarning: current URL string parser is deprecated, and will be removed in a future version. To use the new parser, pass option { useNewUrlParser: true } to MongoClient.connect.

/home/evadmin/.pm2/logs/priceTimeSeries-out.log last 15 lines:
0|priceTim | connected
0|priceTim | connected

Answer 1

我在具有mongoose / MongoDB的服务器上运行pm2，没有问题。看起来可能与如何处理猫鼬模型有关。

尝试做：

StockMoment.create({
                symbol: body[i].symbol,
                price: body[i].price,
                size: body[i].size,
                time: body[i].time,
            });

https://mongoosejs.com/docs/models.html

最初创建文档时不必使用保存。

此外，我不知道您对mongo有多熟悉，但是请确保在控制台中使用use stock-test选择数据库。在使用python读取数据库的更改中，由于python如何在其字典中处理该字符，因此您也可能会遇到“-”问题。

作为PM2服务运行时，节点应用程序可以连接/写入MongoDB吗？

1 个答案: