Chat-application | server client chat application with GUI in python | Socket library
kandi X-RAY | Chat-application Summary
kandi X-RAY | Chat-application Summary
A server client chat application with GUI in python using Sockets and RSA cryptography algorithm for secure data transmission
Support
Quality
Security
License
Reuse
Top functions reviewed by kandi - BETA
- Send message to server
- Encrypt a plaintext message
- Generate a random keypair
- Compute the Euclidecd of a and b
- Return the inverse of the modulo mod m
- Greatest common divisor
- Generate a prime
- Receive messages from server
- Decrypts a msg_ciphertext with a given package key
Chat-application Key Features
Chat-application Examples and Code Snippets
Community Discussions
Trending Discussions on Chat-application
QUESTION
Just starting to understand reactive programming with Reactor and I've come across this code snippet from a tutorial here building-a-chat-application-with-angular-and-spring-reactive-websocket
...ANSWER
Answered 2021-May-20 at 13:21The difference is much more conventional rather than functional - the difference being side-effects vs a final consumer.
The doOnXXX series of methods are meant for user-designed side-effects as the reactive chain executes - logging being the most normal of these, but you may also have metrics, analytics, etc. that require a view into each element as it passes through. The key with all of these is that it doesn't make much sense to have any of these as a final consumer (such as the println() in your above example.)
On the contrary, the subscribe() consumers are meant to be a "final consumer", and usually called by your framework (such as Webflux) rather than by user code - so this case is a bit of an exception to that rule. In this case they're actively passing the messages in this reactive chain to another sink for further processing - so it doesn't make much sense to have this as a "side-effect" style method, as you wouldn't want the Flux to continue beyond this point.
(Addendum: As said above, the normal approach with reactor / Webflux is to let Webflux handle the subscription, which isn't what's happening here. I haven't looked in detail to see if there's a more sensible way to achieve this without a user subscription, but in my experience there usually is, and calling subscribe manually is usually a bit of a code smell as a result. You should certainly avoid it in your own code wherever you can.)
QUESTION
I'm trying to make a real-time socket.io app in Angular and Node, exactly like what is explained here. I set up the server and the client connection, but the connection is never made.
Server Code:
...ANSWER
Answered 2021-May-11 at 12:01This might be related to CORS problems. I had a similar issue where i had the socketio server running on port 5000, the angular app on 4200, which the CORS policy did not like at all. I solved this using a proxy configuration and starting the dev server with --proxy-config proxy.json.
proxy.json:
QUESTION
I am beginner and trying to build a simple chat application with socket.io but when I am connecting socket.io-client with the backend it is reproducing the above mentioned error. I am unable to understand the meaning of the above error so please help me debug my code and understand the meaning and cause of error.
ANSWER
Answered 2021-Apr-15 at 11:39You are starting the server on PORT 8000 but the client is trying to connect to PORT 8081.
Change this line,
QUESTION
I have a react application and I would like to setup a websocket connection to my backend for some realtime updates. I was going to deploy an EC2 or ECS-cluster to host websocket connections. Then I stumbled into some articles showing how websocket connection can be setup in a serverless manner.
One example: https://medium.com/@likhita507/real-time-chat-application-using-webscockets-in-apigateway-e3ed759c4740
However, I can't seem to figure out how this works for a few reasons.
- Lambda has a max runtime of 15 min
- How does the backend establish a connection when no lambda is running and the backend wants to invoke a message to the frontend
Does this entail that I have to keep a lambda alive all the time, if so, it no longer feels like a good idea. In the above example, what I can't grasp is that when creating that chat application, can each chat room only exist for 15 min? And if a user disconnects from the room, how will that user be updated on new messages.
Does anyone have any experience with this kind of solution?
...ANSWER
Answered 2021-Feb-15 at 09:35It's the API Gateway that keeps the websocket connection alive. The browser (or whatever your client is) is connecting to the Gateway, not the lambda function.
The gateway triggers the Lambda function. You hook this up by selecting LAMBDA_PROXY from Integration Request. You can connect each route to a separate function, or have them all dealt with by one, whichever you prefer. Unless you're doing something very complicated in the function, it should only be executing for a few ms.
Communicating from the function to the original client is done through the gateway too - with APIGatewayManagementAPI.postToConnection (or you could roll your own http version using the connection URL I guess).
QUESTION
I'm currently writing a chat-application for my Website and storing all the Messages in one database, by referring to sender and receiver with a Foreign-key. Is this really the smartest Idea? I think the site could become slow when everybody is trying to access the same database or when the number of sent messages gets big. Would it be smarter/faster, to use one database per user, storing his/her messages there? If yes, am i right that this is not really possible to achieve this with Django?
Thanks for your Answer!
...ANSWER
Answered 2020-Mar-10 at 12:18Would it be smarter/faster, to use one database per user
Probably not, because you will still have the same quantity of data and just have the overhead of have multiple database instances
this is not really possible to achieve this with Django?
Django is not a database manager, so the question does not really make sense. For example, Oracle or SQLite allow a single query to access multiple databases. So if you used Oracle with Django, you could have a different database per user. Anyway, even if by default Django only uses one single database connection, it can be configured to use multiple databases (thanks to @brunodesthuilliers for the info).
Database design is a rather complex operation: you have to design the tables to structure the data, the indexes, to speed up some accesses and/or enforce uniqueness, and optionaly views to easy request writing. Once this is done (and the database is used), you will have to define recurrent tasks to cleanup the database (index maintenance, archivage and purge of archived data).
If you intend to use a large farm of servers to be able to handle thousands of simultaneous accesses, a SQL database can indeed become a bottleneck, and you should considere NoSQL databases to dispatch the load on independant servers. But in this use case, Django would just be a casting error. Anyway, I know no example of real world use case where multiple databases are used just for performance reasons.
QUESTION
I have started to study SSE and I found an example with php chat application (http://www.developphp.com/video/JavaScript/Server-Sent-Events-Simple-Chat-Application-Example). The video shows that the messages are not delayed. But when I tried the example on my own server (WAMP) I have a very long delay to the point that it is no longer a real-time application as it claims. I found that if I changed the retry:15000 to a value much much smaller (for example 100 millisecond) only then getting near real-time. But this is not good. This is polling and not truly real-time application. It seems that after each message the connection to the server is lost and resets accordingly to retry. It doesn't seem like a very smart application because we have not avoided constant requests from client to server like plain Ajax polling. Thanks
...ANSWER
Answered 2019-Dec-05 at 15:52It seems that we have to make an infinity loop to the server side code to keep connection opened with only one request. But this makes no sense because we turn again to old plain polling!! Or we have to write code that is synchronous waiting for something in each iteration like, for this particular example, an update of the chat.txt file.
QUESTION
I have seen this question, but it asks if it is okay to use http only and avoid websockets completely when building a chat app.
My situation is:
I have a simple chat app I am building. When sending a new message I am using an Http Post request(I am using Angular) to send the data to the server where it is persisted in the database, then is broadcasted via sockets to the appropriate clients. Are there any advantage or disadvantages of doing it like this? Instead of just using web sockets throughout?
According to this answer you should avoid using sockets where possible.
...ANSWER
Answered 2019-Nov-17 at 20:13You could do it either way, but since you want to make a simple chat app, then you should probably use HTTP to send messages and a web socket to receive channel updates.
On both the client and server side, this will avoid complexities involved in multiplexing both inbound and outbound events over the same connection. This often turns out to be non-trivial, especially if you have to fall back from web sockets to long polling.
QUESTION
I'm building a multiple chatbox messaging like Facebook's popup messenger windows. At the moment, the user can call up a chatbox, close it, minimize it, etc.
When I click on multiple users, say 3, I'm supposed to have three chatboxes pop up corresponding to those three different users. Currently, only one chatbox appears.
This screenshot illustrates what I want to achieve. On each user's button click, it's own chatbox will popup.
Here is the demo and download link for a jQuery equivalent: link.
This is the full React code which shows just one chat box:
...ANSWER
Answered 2019-Feb-15 at 21:18After series of efforts, the use of jquery and Reactjs is what solved my issue as per code below
QUESTION
I've tried this tutorial on how to set up a localhost, and some code worked, some didn't. But currently I am receiving strange experience with it:
Below in the code at res.sendfile it's important to mention that the terminal comments this command as deprecated.
Using res.sendFile gives however the following error.
I've tried to use .sendFile with the absolute path, but it didn't work:
ANSWER
Answered 2019-Jul-26 at 17:14You can use the __dirname variable which stores the absolute path of the current executing script. You can append this path in the sendFile function.
QUESTION
In this firestore official guide , it says that
Local writes in your app will invoke snapshot listeners immediately. This is because of an important feature called "latency compensation." When you perform a write, your listeners will be notified with the new data before the data is sent to the backend
- So Firestore client (that posted this data) will not fetch this data via listeners from server ?
- Will this still be charged as a Read Op (in case data is not fetched from server) ?
- Is this concept true for Realtime Database as well ?
I tested it with a client writing new object to /chats/chatRoomId/ and same client having listeners for child_added on /chats/chatRoomId/. I turned off the internet, still the pushing new data was reported OK (due to offline ability i guess), and listeners also reported receiving new data (even without server access)
I want to structure my chat app's DB, such that i can cut cost on unnecessary reads (if there are any) in chat DB structure given here and here recommended by @FrankVanPuffelen from Firebase.
...
ANSWER
Answered 2019-Apr-30 at 11:59
- So Firestore client (that posted this data) will not fetch this data via listeners from server ?
When you write some data locally a snapshot listener will be invoked immediately. This means that your listeners will be notified right away because you have added some new data. But rememer, this operation is happening before the data is sent to the Firebase servers.
- Will this still be charged as a Read Op (in case data is not fetched from server) ?
No. As long as you have cached data and there are no changed documents on the server, you won't be charged with any "Read Op" in Firestore.
- Is this concept true for Realtime Database as well ?
No, it's not. Firebase reltime database has different concept for pricing.
I want to structure my chat app's DB, such that i can cut cost on unnecessary reads (if there are any) in chat DB structure given here and here recommended by @FrankVanPuffelen from Firebase.
Both examples are for Firebase realtime database and both explain a very good way for creating a chat app. If you consider at some point to try using Cloud Firestore for a chat app, here you can find a tutorial on how to create a complete and functional Firestore Chat App.
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
Install Chat-application
You can use Chat-application like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.
Support
Reuse Trending Solutions
Find, review, and download reusable Libraries, Code Snippets, Cloud APIs from over 650 million Knowledge Items
Find more librariesStay Updated
Subscribe to our newsletter for trending solutions and developer bootcamps
Share this Page
