Im relatively new to the MongoDB. At first I used mongoose, but now I decided to abandon it. Immediately I ran into the following problem: I can't understand how to print all the performed queries to the console.
In mongoose this could be done as simple as to write mongoose.set('debug', true), but how to do that using native driver?
I've read about Logger in the dcumentation, but the output seems completely unreadable for me. Is it possble to tune the output or i should just parse that somehow?
The Logger class no longer logs queries in version 4.0. You can do this instead:
const uri = "mongodb+srv://<user>:<password>#<cluster-url>?writeConcern=majority";
const client = new MongoClient(uri, { monitorCommands:true });
client.on('commandStarted', (event) => console.debug(event));
client.on('commandSucceeded', (event) => console.debug(event));
client.on('commandFailed', (event) => console.debug(event));
You should use the mongo's Logger class (see the official API doc):
const connect = async () => {
console.log("Connecting to database...");
try {
let client = await MongoClient.connect(uri, opts);
console.log("Database connected.");
Logger.setLevel("debug");
console.log("MongoDB Logger set to DEBUG");
} catch (e) {
console.log("ERROR: " + e.message);
}
};
The Logger class has multiple options (info, debug, error). They will log different types of database actions/events.
Related
I have an array of docs ids that I want to delete in using a cloud function, my code looks like the following :
//If the user decieds on deleting his account forever we need to make sure we wont have any thing left inside of db after this !!
// incoming payload array of 3 docs
data = {array : ['a302-5e9c8ae97b3b','92c8d309-090d','a302-5e932c8ae97b3b']}
export const deleteClients = functions.https.onCall(async (data, context) => {
try {
// declare batch
const batch = db.batch();
// set
data.arr.forEach((doc: string) => {
batch.delete(db.collection('Data'), doc);
});
// commit
await batch.commit();
} catch (e) {
console.log(e);
}
return null;
});
I am getting a syntax error on batch.delete how to pass the right arguments in to the batch delete to reference that doc I want to submit for deletion before commit ?
Delete takes a single param, the doc ref of the doc to be deleted.
data.arr.forEach((docId: string) => {
batch.delete(doc(db, "Data", docId));
});
There are several errors in your code:
data.arr.forEach() cannot work wince your data object contains one element with the key array and not the key arr.
You are mixing up the syntax of the JS SDK v9 and the Admin SDK. See the write batch Admin SDK syntax here.
You need to send back some data to the client when all the asynchronous work is complete, to correctly terminate your CF.
You do return null; AFTER the try/catch block: this means that, in most of the cases, your Cloud Function will be terminated before asynchronous work is complete (see the link above)
So the following should do the trick (untested):
const db = admin.firestore();
const data = {array : ['a302-5e9c8ae97b3b','92c8d309-090d','a302-5e932c8ae97b3b']};
export const deleteClients = functions.https.onCall(async (data, context) => {
try {
const batch = db.batch();
const parentCollection = db.collection('Data')
data.array.forEach((docId) => {
batch.delete(parentCollection.doc(docId));
});
// commit
await batch.commit();
return {result: 'success'} // IMPORTANT, see explanations above
} catch (e) {
console.log(e);
// IMPORTANT See https://firebase.google.com/docs/functions/callable#handle_errors
}
});
I followed several hundred links, most including stackoverflow links, to try to come up with a solution to this problem, but none yielded results.
I am simply trying to get the server to access client's detail via google. Ie, get the client's Google Sheets. I followed their documentation, but for the most part, its on client side only. I followed the instructions for server-side, but it has uncompleted work in it. I found out that the method to do is to have the client sign in via OAuth2.0 and then send the recieved code to the server to process to its very own access code. That is what I'm doing, however, when I try to query any data, I get that error in the title. Here is the code snippets, please let me know if there's anything I'm missing. RIP my rep.
server:
const Router=require("express").Router()
const auth=require("../utils/auth")
const fs= require("fs")
const {OAuth2Client}=require("google-auth-library")//I tried with this library instead, and it will give the exact same error.
const {google} = require('googleapis');
var auths=[]
function oAuth2ClientGetToken(oAuth2Client, code) {
return new Promise((resolve, reject) => {
oAuth2Client.getToken(code, (err, token) => { // errors out here
if (err) reject(err);
resolve(token);
});
});
}
async function formAuthClient(code) {
const {client_secret, client_id,redirect_uris} = JSON.parse(fs.readFileSync(__dirname+"/credentials.json"))
const oAuth2Client = new google.auth.OAuth2( // form authObject
client_id, client_secret,redirect_uris[1]
);
// var oauth2Client = new OAuth2Client(client_id,client_secret,redirect_uris[1]); other method
const token = await oAuth2ClientGetToken(oAuth2Client, code).catch(console.err);
// oauth2Client.credentials=token other method of oauth2.0
oAuth2Client.setCredentials(token);
return oAuth2Client;
}
Router.get("/",(req,res)=>{
res.render("home")
})
Router.post("/sheet",async (req,res)=>{
try {
const requestBody = {
properties: {
title:"hello"
}
};
var sheets= google.sheets({version:"v4", auth: auths[req.session.id]})
await sheets.spreadsheets.create(requestBody)
} catch (error) {
res.json(error)
}
})
Router.post("/login",(req,res)=>{
console.log("token: ",req.body.token);
req.session.token=req.body.token
console.log("req.session.id:",req.session.id);
auths[req.session.id]=formAuthClient(req.body.token)
res.status(200).json()
})
module.exports=Router
the client scripts is a simple button that will trigger an "getOfflineAccess" command and ask the user to log in and then send that data to the server with "/login". then, once another button is pushed, it will call "/sheet". I appreciate all help with this. I ran out of links to click on trying to solve this problem
I tried to find the solutions over here but unable to get success while using $pull as the array values I have does not contain `mongo_id'.
So the scenario is that , I am trying to delete the specific comment of the particular user which I am passing through query params. M
My mongo data looks like this:
Now I am making API Delete request like this : http://localhost:8000/api/articles/learn-react/delete-comment?q=1 on my localhost .
ANd finally my code looks like this:
import express from "express";
import bodyParser from "body-parser";
import { MongoClient } from "MongoDB";
const withDB = async (operations, res) => {
try {
const client = await MongoClient.connect(
"mongodb://localhost:27017",
{ useNewUrlParser: true },
{ useUnifiedTopology: true }
);
const db = client.db("my-blog");
await operations(db);
client.close();
} catch (error) {
res.status(500).json({ message: "Error connecting to db", error });
}
};
app.delete("/api/articles/:name/delete-comment", (req, res) => {
const articleName = req.params.name;
const commentIndex = req.query.q;
withDB(async(db) => {
try{
const articleInfo = await db.collection('articles').findOne({name:articleName});
let articleAllComment = articleInfo.comments;
console.log("before =",articleAllComment)
const commentToBeDeleted = articleInfo.comments[commentIndex];
//console.log(commentToBeDeleted)
// articleAllComment.update({
// $pull: { 'comments':{username: commentToBeDeleted.username }}
// });
articleAllComment = articleAllComment.filter( (item) => item != commentToBeDeleted );
await articleAllComment.save();
console.log("after - ",articleAllComment);
//yaha per index chahiye per kaise milega pta nhi?
//articleInfo.comments = gives artcle comment
res.status(200).send(articleAllComment);
}
catch(err)
{
res.status(500).send("Error occurred")
}
},res);
});
I have used the filter function but it is not showing any error in terminal but also getting 500 status at postman.
Unable to figure out the error?
I believe you'll find a good answer here:
https://stackoverflow.com/a/4588909/9951599
Something to consider...
You can use MongoDB's built-in projection methods to simplify your code.
https://docs.mongodb.com/manual/reference/operator/projection/positional/#mongodb-projection-proj.-
By assigning a "unique ID" to each of your comments, you can find/modify the comment quickly using an update command instead of pulling out the comment by order in the array. This is more efficient, and much simpler. Plus, multiple read/writes at once won't interfere with this logic during busy times, ensuring that you're always deleting the right comment.
Solution #1: The recommended way, with atomic operators
Here is how you can let MongoDB pull it for you if you give each of your comments an ID.
await db.collection('articles').updateOne({ name:articleName },
{
$pull:{ "comments.id":commentID }
});
// Or
await db.collection('articles').updateOne({ name:articleName, "comments.id":commentID },
{
$unset:{ "comments.$":0 }
});
Solution #2 - Not recommended
Alternatively, you could remove it by index:
// I'm using "3" here staticly, put the index of your comment there instead.
db.collection('articles').updateOne({ name:articleName }, {
$unset : { "comments.3":0 }
})
I do not know why your filter is erroring, but I would recommend bypassing the filter altogether and try to utilize MongoDB's atomic system for you.
So I've been searching for a long time on mqtt.js examples for structuring and best practices and haven't found anything worthwhile. thus [main] how do you structure your mqtt.js code in your node/express application?
[1] So the libraries mqttjs/async-MQTT provides some example on connecting and on-message but on a real app with lots of subscription and publishes how to structure code so that it initiliazes on the app.js and uses the same client (return from the mqtt.connect) for all the sub/pub in different files.
[2] and from the question[1] should my app only use 1 client for all the works or can use multiple clients as needed on multiple files (let's say I have 3 files mqttInit, subscriber, publisher. so if I use the init on subscriber and get a client should I export it or just make a new instance of a client on the publisher file)
[3] so the mqttjs API provides only an onMessage function so all subscribed topics message gets here thus I put a switch or a if else to manage this so if we have a lot of topics how do you manage this
[4] so my current setup is kind of messed up
this is the initializer file lets say'
mqttService.js
const mqtt = require("mqtt");
const { readFileSync } = require("fs");
module.exports = class mqttService {
constructor() {
this.client = mqtt.connect("mqtt://xxxxxxxxxxx", {
cert: readFileSync(process.cwd() + "/certificates/client.crt"),
key: readFileSync(process.cwd() + "/certificates/client.key"),
rejectUnauthorized: false,
});
this.client.on("error", (err) => {
console.log(err);
});
this.client.once("connect", () => {
console.log("connected to MQTT server");
});
}
};
subscriber.js
this is the function(subscribe()) that I call in app.js to init the mqtt thing
const { sendDeviceStatus, sendSensorStatus } = require("../socketApi");
const { client } = new (require("./mqttService"))();
function subscribe() {
let state = {
timer: false,
};
...
let topics = {
....
},
client.subscribe([...]);
client.on("message", async (topic, buffer) => {
if (topic) {
...
}
});
}
module.exports = {
subscribe,
client,
};
publish.js
const { AsyncClient } = require("async-mqtt");
const _client = require("./subscribe").client;
const client = new AsyncClient(_client);
async function sendSensorList(daqId) {
let returnVal = await client.publish(
`${daqId}-GSL-DFC`,
JSON.stringify(publishObject),
{ qos: 1 }
);
console.log(returnVal);
return publishObject;
}
.....
module.exports = {
sendSensorList,
.......
};
so as you can see from the above code everything is kind of linked with one another and messed up thus I need some expo on how you structure code
thanks for reading, please feel free to provide any info and any info is much appreciated
I'm new to react native moved from ReactJS I thought I can use same packages as my previous pure Reactjs app but I was wrong.
What I'm trying to do is to make a websocket connection.
I'm recently using autobahnJS package WAMP2 in my ReactJS app but when I moved to react native it seems autobahnJS doesn't support react-native
connectToSocketFunction = () =>{ // autobahn code
let connection = new autobahn.Connection({ url: 'wss://api.example.com/websocket/', realm: 'Realm1', authmethods: ['jwt'] });
connection.onopen = (session, detalis) => {
session.subscribe('ChannelName', (data)=>console.log(data));
};
Anyone know how does react native make socket connection based on my code?
I have tried react-native-autobahnjs doesn't work
The React Native documentation mentions support for WebSocket connections:
var ws = new WebSocket('ws://host.com/path');
ws.onopen = () => {
// connection opened
ws.send('something'); // send a message
};
ws.onmessage = (e) => {
// a message was received
console.log(e.data);
};
ws.onerror = (e) => {
// an error occurred
console.log(e.message);
};
ws.onclose = (e) => {
// connection closed
console.log(e.code, e.reason);
};
https://facebook.github.io/react-native/docs/network.html#websocket-support
You will most likely need to use other React Native based frameworks to fill in the gaps that Autobahn provided, e.g. session support and JWT authentication.