Javascript 我的节点脚本在函数完成后挂起
我正在调用三个函数,在这些函数完成后,我希望我的脚本自己关闭,但它只是挂起 我尝试过使函数异步/基于承诺,在每个“mongodb”类型的函数之后关闭数据库,并在函数中使用process.exit()作为对上次调用函数的回调 连接到(本地-非Atlas)数据库:Javascript 我的节点脚本在函数完成后挂起,javascript,node.js,mongodb,Javascript,Node.js,Mongodb,我正在调用三个函数,在这些函数完成后,我希望我的脚本自己关闭,但它只是挂起 我尝试过使函数异步/基于承诺,在每个“mongodb”类型的函数之后关闭数据库,并在函数中使用process.exit()作为对上次调用函数的回调 连接到(本地-非Atlas)数据库: MongoClient.connect(local, {useNewUrlParser: true, useUnifiedTopology: true}, function(err, db) { if (err) { cons
MongoClient.connect(local, {useNewUrlParser: true, useUnifiedTopology: true}, function(err, db) {
if (err) {
console.log(err)
}
else {
console.log('Connected to MongoDB...')
//Read in data from jsonfiles and store each file's contents into the database : This is where the functions are being called... within a successful connect to the MongoDB
insertJSON(db, jsonfiles, 'requests', jsonfilesSource)
insertJSON(db, issuedfiles, 'issuedLicenses', isssuedfilesSource)
insertLicenses(db)
}
db.close()
})
职能1:
function insertJSON(db, dirBuf,collection, sourceFolder) {
var database = db.db('license-server')
var collection = database.collection(collection)
fs.readdir(dirBuf, function(err, files) {
if (err) {
console.log(err.message)
}
else {
files.forEach(function(filename) {
var text = fs.readFileSync(sourceFolder + filename);
var filecontents = JSON.parse(text)
//collection.insertOne(filecontents)
collection.findOne({"DisplayTitle" : filecontents.DisplayTitle, "NodeInformation" : filecontents.NodeInformation, "Date": filecontents.Date})
.then(function(result) {
if(result) {
console.log(`An Item could already be in the database: A file is unique if its display title, nodeinformation, and date are different.
the items display title is ${result.DisplayTitle}`)
return
}
else {
collection.insertOne(filecontents)
console.log(`Added ${filecontents.DisplayTitle} to database`)
}
})
.catch(function(error) {
console.log(error)
})
})
}
})
}
职能2:
function insertLicenses(db) {
// Set up GridFS to import .lic and .licx files into the database
var database = db.db('license-server')
var collection = database.collection('fs.files')
var bucket = new mongodb.GridFSBucket(database);
var dirBuf = Buffer.from('../license-server/private/licenses')
fs.readdir(dirBuf, function(err, files) {
if (err) {
console.log(err.message)
}
else {
files.forEach(function(filename) {
collection.findOne({"filename": filename}).
then(function(result) {
if(result) {
console.log(`The file ${filename} is already in the database`)
return
}
else {
fs.createReadStream('./private/licenses/' + filename).
pipe(bucket.openUploadStream(filename)).
on('error', function(error) {
assert.ifError(error)
}).
on('finish', function() {
console.log(`Uploaded ${filename}`)
})
}
})
})
}
})
// I tried calling db.close() here since this is the last function to be called. No luck.
}
我猜这与mongodb函数有自己的关闭方式有关,但我似乎找不到我在以前解决这个问题的尝试中所寻找的内容
预期的结果应该是脚本自身关闭,实际的结果是处理脚本。所有这些数据库调用都是异步的——运行此代码的结果是立即调用
db.close
,然后在insertJSON
和insertLicenses
中执行工作。如果要重写此命令以使用async/await
(您还需要更新其他函数),db.close
调用将关闭数据库,这将允许脚本退出:
await insertJSON(db, jsonfiles, 'requests', jsonfilesSource)
await insertJSON(db, issuedfiles, 'issuedLicenses', isssuedfilesSource)
await insertLicenses(db)
db.close()