Azure is driving me mad again. What I try to achieve is that the data that comes in through an Event Hub needs to be written to the database. What I got working thus far is that the data arrives at the Event Hub and that the Azure function is able to post data to the database. I would prefer to do this with Node.JS as the integration seems kind of nice in Azure. The script I use to send some bogus data to the database is as follows:
module.exports = async function (context, eventHubMessages){
const initOptions = {
query(e) {context.log(e.query)},
capSQL: true
//capSQL: true // capitalize all generated SQL
};
const pgp = require('pg-promise')(initOptions);
const db = pgp({
host: '####',
user: '####',
password: '####',
database: 'iotdemo',
port: 5432,
ssl: true
});
// our set of columns, to be created only once (statically), and then reused,
// to let it cache up its formatting templates for high performance:
const cs = new pgp.helpers.ColumnSet(['customer', 'tag', 'value', 'period'], {table: 'testtable'});
// generating a multi-row insert query:
const query = pgp.helpers.insert(JSON.parse(eventHubMessages), cs);
//=> INSERT INTO "tmp"("col_a","col_b") VALUES('a1','b1'),('a2','b2')
// executing the query:
db.none(query);
};
And yes, this is a snippet from somewhere else. The 'eventHubMessages' should contain the payload. A couple of issues that I have had thus far are:
I can send a payload defined within the script or whilst giving it a testing payload, but I cant send the payload of the actual message
pg-promise returns a 202 regardless of whether it fails or not, so debugging is 'blind' at the moment. Any tips on how to get proper logging would be much appreciated.
I used 'capture events' in the event hub instance to capture the actual messages. These were stored in a blob storage. In noticed that the format is Avro. Do I need to peel away at that object to get to the actual array?
The input should look something like this:
[{"customer": duderino, "tag": nice_rug, "value": 10, "period": 163249839}]
I think I have 2 issues:
I dont know how to get meaningful logging out of the Azure function using Node.JS
Something is off about how my payload is coming in.
A more deeper question is, how do I know whether the Azure function is getting the data that it should. I know that the Event Grid gets the data, but there is no throughput. Namespaces are consistent and the Azure Function should be triggered by that namespace and get the input as a string.
I am seriously lost and out of my depth. Apart from the solution I would also appreciate feedback on my request. I am not a pro on StackOverflow and don't want to waste your time.
Regards
Ok, so after some digging I found a few things to resolve the issue. First of all, I was receiving the payload as a string, meaning that I needed it to parse first, before I could make it a callable object. In terms of code its simple, and part of the base functions of node.js
var parsed_payload = JSON.parse(payload_that_is_a_string);
Lastly, to get meaningful logging I found that the PG-Promise module has great support for that, and that this can be configured when loading the module itself. I was particularly interested in errors, so I enabled that option like so:
const initOptions = {
query(e) {console.log(e.query)},
capSQL: true,
//capSQL: true // capitalize all generated SQL
error: function (error, e) {
if (e.cn) {
// A connection-related error;
// console.log("DC:", e.cn);
// console.log("EVENT:", error.message);
}
}
};
That then can be used as a settings object for loading PG-Promise:
const pgp = require('pg-promise')(initOptions);
Thanks for considering my ask for help. I hope this proves useful for anyone out there!
Regards Pieter
Related
I've been trying out GunJs for a couple of days now and I'm really enjoying it. As a starter project I've followed the Fireship chat dapp video aimed at building your own chat.
Here's the issue, now that I've finished the tutorial I would like to create my own chat. However, for some reason if I get a 'chat' node within my own app it seems to pick up on the same 'chat' node as the tutorial one that is online.
onMount(() => {
// Get Messages in large chat
db.get('chat')
.map()
.once(async (data, id) => {
if (data) {
// key for E2E - to do: change for web3
const key = '#foo';
var message = {
//transform the data
who: await db.user(data).get('alias'),
what: (await SEA.decrypt(data.what, key)) + '',
when: GUN.state.is(data, 'what'),
};
if (message.what) {
messages = [...messages.slice(-100), message]
}
}
})
})
This is also the case if I change the encryption key (then the messages just become undefined). Multiple questions arise from this:
Are graph node names unique within the whole of GunDb?
How do you handle conflicts where two gun-based apps call on the same node name?
Is this problem generally solved through filtering using 'header' props?
How do I make it pick up on only my data?
Even if I've read most of the docs, there seems to be something I'm missing in my comprehension of how the graph is generally seperated between apps. Any insight on how this works would be much appreciated.
Are graph node names unique within the whole of GunDb?
Yes.
How do you handle conflicts where two gun-based apps call on the same node name?
You don't. The expected result will be, they will overwrite each other.
Is this problem generally solved through filtering using 'header' props?
I don't think it's the right way to do it.
How do I make it pick up on only my data?
Use your own relay server.
Conclusion :
gunDB doesn't really care about the who fetch / put the data. If you want to protect your data, use your own relay server (not a public one), and put data in your user space. user space is readonly to the public, but read/write for the owner.
I am having some issues trying to connect to a matrix server using the matrix-js-sdk in a react app.
I have provided a simple code example below, and made sure that credentials are valid (login works) and that the environment variable containing the URL for the matrix client is set. I have signed into element in a browser and created two rooms for testing purposes, and was expecting these two rooms would be returned from matrixClient.getRooms(). However, this simply returns an empty array. With some further testing it seems like the asynchronous functions provided for fetching room, member and group ID's only, works as expected.
According to https://matrix.org/docs/guides/usage-of-the-matrix-js-sd these should be valid steps for setting up the matrix-js-sdk, however the sync is never executed either.
const matrixClient = sdk.createClient(
process.env.REACT_APP_MATRIX_CLIENT_URL!
);
await matrixClient.long("m.login.password", credentials);
matrixClient.once('sync', () => {
debugger; // Never hit
}
for (const room of matrixClient.getRooms()) {
debugger; // Never hit
}
I did manage to use the roomId's returned from await matrixClient.roomInitialSync(roomId, limit, callback), however this lead me to another issue where I can't figure out how to decrypt messages, as the events containing the messages sent in the room seems to be of type 'm.room.encrypted' instead of 'm.room.message'.
Does anyone have any good examples of working implementations for the matrix-js-sdk, or any other good resources for properly understanding how to put this all together? I need to be able to load rooms, persons, messages etc. and display these respectively in a ReactJS application.
It turns out I simply forgot to run startClient on the matrix client, resulting in it not fetching any data.
I just wanted to know if there's a way to count how many times a message has been sent in my Discord server, so the bot can send a message. I'm new with coding, so I don't know many things. Thank you in advance!
Explanation
To store the amount of messages sent in a guild, you'll have to keep track of a count somehow. Each time a message is sent, you can increment it by 1. Then, upon a user's request, you can display that number.
One easy option would be to store this "message count" for each guild inside of a JSON file. However, this would greatly impact performance. Consider a database for much better speeds and reliability.
Example Setup
Before using this system, create a guilds.json file with a blank object ({}).
Declaring the necessary variables...
const fs = require('fs'); // fs is the built-in Node.js file system module.
const guilds = require('./guilds.json'); // This path may vary.
Adding the system to the message event listener...
client.on('message', message => {
// If the author is NOT a bot...
if (!message.author.bot) {
// If the guild isn't in the JSON file yet, set it up.
if (!guilds[message.guild.id]) guilds[message.guild.id] = { messageCount: 1 };
// Otherwise, add one to the guild's message count.
else guilds[message.guild.id].messageCount++;
// Write the data back to the JSON file, logging any errors to the console.
try {
fs.writeFileSync('./guilds.json', JSON.stringify(guilds)); // Again, path may vary.
} catch(err) {
console.error(err);
}
}
});
Using the system in a command...
// Grab the message count.
const messageCount = guilds[message.guild.id].messageCount;
// Send the message count in a message. The template literal (${}) adds an 's' if needed.
message.channel.send(`**${messageCount}** message${messageCount !== 1 ? 's' : ''} sent.`)
.catch(console.error);
JSON is highly prone to corruption if a queue system is not created that will make sure multiple reads and writes are not happening to a file all at the same time. For the purpose of what you want, I would use something like SQLite that requires minimal setup, is easy to learn, and has helper frameworks to make it easier to use such as Keyv and Sequelize.
Here is a good guide on how to use sqlite in the nodejs runtime environment.
In the VSTS Rest API, there's a piece of documentation showing me how to create a folder. Specifically, I would like to create a folder within the Shared Queries folder. It seems like I can do this with the REST API.
I would like to do the same thing with the VSTS Node API (vso-node-api). The closest analogous function I can seem to find would be WorkItemTrackingApi.createQuery. Is this the correct function to use?
When I try to use this function, I'm getting an error:
Failed request: (405)
That seems strange, since a "Method Not Allowed" error doesn't seem like the right error here. In other words, I'm not the person deciding what method (GET/POST/...etc) to use, I'm just calling the VSTS Node API's function which should be using the correct HTTP Request Method.
I think the error code would/should be different if something about my request is wrong (like providing bad parameters/data).
But, I would not be surprised if VSTS didn't like the data I provided with the request. I wrote the following test function:
async function createQueryFolder (QueryHeirarchyItem, projectId, query) {
let result = await (WorkItemTrackingApi.createQuery(QueryHeirarchyItem, projectId, query))
return result
}
I set some variables and called the function:
let projectID = properties.project // A previously set project ID that works in other API calls
let QueryHeirarchyItem = {
isFolder: true,
name: 'Test Shared Query Folder 1'
}
try {
let result = await createQueryFolder(QueryHeirarchyFunction, projectID, '')
Notice that I provided a blank string for the query - I have no idea what to provide there when all I want to create is a folder.
So, I think a lot of things could be wrong with my approach here, but also if my request parameters are wrong maybe I should be getting a 400 error? 405 leads me to believe that the VSTS Node API is making a REST call that the underlying VSTS REST API doesn't understand.
For the third parameter of the createQueryFolder, you should specify the folder path where you want to create the new folder.
Such as if you want to create a folder Test Shared Query Folder 1 under Shared Queries, you should specify parameters for createQueryFolder as:
let result = await createQueryFolder(QueryHeirarchyFunction, projectID, 'Shared Queries')
I'm trying to set up mongodb on Windows 8 using node.js, Does anyone know why im getting this error. C:\users\phill\node_modules\mongodb\lib\mongodb\mongo_client.js:359 it also says at collection = db collection,,, can't call method 'collection' of null. I'm having a hard time setting it up. My goal is to be able to add to mongo db, and see that I add or pull up what I added, but adding something is good enough for me for now. I'm trying every thing I can find, even straight from the website, I tried everything I see on here as well. Think it maybe it's the way I have things set up. My node.js is saved in my c: drive there is a file that says, program files(86x) in there I have node_modules, npm and such. The path ends up being, computer > windows (C:) > program files(86x) > nodejs. My Mongodb is saved right on my C: drive the path end up being windows (C:) > mongodb-win32-x86_64-2008plus-2.4.8. In my C: I also created a file data and in it created another db. I have been told i should just use mongoose, I'm just learning so i open to any advice, links or anything that will help. I have one last question as well, i learned php and then found out about sql injections and stuff like that, i am not seeing anything about security at all, should i expect the same as well. For this i get text not defined, but i have been getting errors with everthing i have done, best i did was get stuck on a right concern screen.
var MongoClient = require('mongodb').MongoClient;
MongoClient.connect("mongodb://localhost:27017/integration_test", function(err, db) {
test.equal(null, err);
test.ok(db != null);
db.collection("replicaset_mongo_client_collection").update({a:1},
{b:1}, {upsert:true}, function(err, result) {
test.equal(null, err);
test.equal(1, result);
db.close();
test.done();
});
});
Tried this as well and getting a error,C:\users\phill\node_modules\mongodb\lib\mongodb\mongo_client.js:359.... at collection = db collection,,, can't call method 'collection' of null. im calling it in command prompt node filename.js I'm saving it where my node.js file is, I have pulled up files before and created a server.
var Db = require('mongodb').Db,
MongoClient = require('mongodb').MongoClient,
Server = require('mongodb').Server,
ReplSetServers = require('mongodb').ReplSetServers,
ObjectID = require('mongodb').ObjectID,
Binary = require('mongodb').Binary,
GridStore = require('mongodb').GridStore,
Grid = require('mongodb').Grid,
Code = require('mongodb').Code,
BSON = require('mongodb').pure().BSON,
assert = require('assert');
var db = new Db('test', new Server('localhost', 27017));
// Fetch a collection to insert document into
db.open(function(err, db) {
var collection = db.collection("simple_document_insert_collection_no_safe");
// Insert a single document
collection.insert({hello:'world_no_safe'});
// Wait for a second before finishing up, to ensure we have written the item to disk
setTimeout(function() {
// Fetch the document
collection.findOne({hello:'world_no_safe'}, function(err, item) {
assert.equal(null, err);
assert.equal('world_no_safe', item.hello);
db.close();
})
}, 100);
});
In your first code example, you said:
For this i get text not defined
I assume you meant "test not defined?" Your script only requires the mongodb library, and I don't believe test is a core nodejs function, so that would explain the error.
To reference the driver documentation for db.collection(), an assert library is used, but also properly imported (as you did in your second example).
Within your callback to db.open(), you don't check if an error occurred. That might shed some light on why db is null in that function.
Regarding your question about the equivalent of SQL injection with MongoDB, the main areas of concern are places where you might pass untrusted input into evaluated JavaScript, or using such input to construct free-form query objects (not simply using a string, but more like dropping an object into your BSON query). Both of these links should provide more information on the subject:
What type of attacks can be used vs MongoDB?
How does MongoDB address SQL or Query injection?