Questions tagged [async-await]
This covers the asynchronous programming model supported by various programming languages, using the async and await keywords.
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0answers
55 views
Putting a Queue Between HTTP Request/Response
We currently have two legacy systems: the Consumer and the Worker. These systems are massively complex in ways that are not important to this review, but it is enough to say that a large-scale re-...
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0answers
36 views
Limit concurrent calls per period in C#
I have an external API which is rate limited, so I can call it only 50 times per second with the same auth token.
I have many auth tokens, so I need throttling per auth token, which will not allow me ...
4
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0answers
78 views
Safely executing background tasks in parallel in ASP.NET Core
Context and initial idea
I'm trying to teach myself the CQRS and Event Sourcing patterns by developing a simple ASP.NET Core application, loosely following Greg Young's example CQRS implementation on ...
3
votes
1answer
41 views
Separating Fetch Calls and using in Promise Chain
I´m currently working on a small microservice application, which will in it´s simplest form just receive a Request from a Formular and and based on containing information perform several other Server-...
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3answers
69 views
Class constructor with async properties set from poke-api
So, this is for a clicker game I'm trying to build with Pokémon data drawn from the PokéAPI. Since I'm using Vue.js for the project, ...
0
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1answer
26 views
Displaying multiple objects on map and calculating distances using google api
I am quite new to Javascript. For a school project we wrote a website that displays the user's location on a google map alongside with some objects such as vehicles or passengers.
I rewrote my code ...
1
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1answer
76 views
Parallel FTP client
I was given the task to download files for a FTP server. The download should be fairly fast. 15 parallel connections can be used.
I have used FluentFTP as the ...
2
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0answers
62 views
Scheduler built with observables v3 (follow-up) - now testable
This is a 2nd follow-up to my previous one about a Scheduler built with observables.
Although the last one was working correctly, it was only possible to see this ...
3
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1answer
34 views
JavaScript that deletes everything inside a folder on Box.com
I just finished a simple script for Node that will delete all the folders and files inside a specified folder ID through Box's API. It works by getting a list of items inside a folder, then generating ...
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2answers
65 views
Get an array of currency exchange prices based on asset
Function getMarkets
Makes a call to get Cryptocurrency Exchange data based on asset (USD, USDC, USDT)
It calls the endpoint 3 times to return 3 arrays which are then returned to the callee.
I have ...
1
vote
0answers
53 views
C# Async/Await networking server
I made a simple async networking server and I'd like to get some input on the code, whether things can be done better and whether the code is stable (able to hold more than 1000 connections without ...
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0answers
111 views
Async SelectMany implementation
Async SelectMany takes an enumeration (length unknown) of tasks, each of which returns another enumeration (length unknown and likely different from one another), and returns results from the second ...
3
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0answers
95 views
TCP client reading socket asynchronously
I'm relatively new to .Net/UWP networking and have been trying to make sense of the APIs. I'd like to implement a TCP client that is capable of reading and sending messages independently (there is no ...
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0answers
56 views
Aggregate sensor readings from multiple sources
I've developed a toy example to investigate how async works in C#. Though I've learned a lot this week, I'm still unsure of the finer details, as this is my first C#...
0
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1answer
50 views
Enforcing C# Task to exist only once at any given point of time for a given ID
There were multiple times in different applications that I needed to accomplish the following behavior with C# Task and I did it in a certain way, and would like to ...
2
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0answers
32 views
Porting python's 'with' construct to TypeScript
Now that async generators are available in the platforms I care about, I figured I'd try porting Python's ingenious with construct to JS as a utility. My first stab ...
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0answers
70 views
Using up to 15 connections to synchronize files from a FTP server with local files
Task: Create a service which will synchronize files on FTP server with files on local drive.
FTP server allows up to 15 concurent connections
Synchronize the files as fast as possible
Files on FTP ...
2
votes
0answers
135 views
MVVM Databinding, Commands, Async - MVVM.Light [closed]
I'm new to C#, WPF and MVVM and I don't want to make common mistakes right from the beginning and get used to them. I already read some similar questions on best practices for WPF/MVVM but none of ...
2
votes
1answer
55 views
Await socket Response
I wrote this to make the "callback hell" more manageable on the part of the coder when using Socket IO, so that there wasn't really any callback hell to go with, just a simple await.
This should work ...
3
votes
0answers
460 views
Sending notifications with Django channels
I have project on Django wich use Django Channels. I use Django Channel for sending notifications to users who are subscribed to articles changes (adding/editing/deleting comments on article).
So I'...
2
votes
1answer
37 views
Chart of answered CR posts percentages over time - Part 2
I created a graph to show the change in the percentage of questions answered over time and the first version fetched data from chat transcripts using PHP. The sub-domain I have registered for my ...
0
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1answer
45 views
3
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1answer
276 views
Executing query until there is nothing more left
I often query a database to get a batch of items to procees. I do this as long as the query returns some items. I use this pattern quite a lot so I thought I create a small helper so that I don't have ...
1
vote
1answer
649 views
Extension method to to run any async method synchronously
Sometimes I need to call async code from a synchronous method. This leads to repetition in code to wait for the task to complete, then ensure that the expected ...
2
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0answers
45 views
Conditional AsyncLock implementation
I have a case where I match data from DB by the various filters. Until the match is updated in the DB, I don't want to accept requests for matching with the same criteria, as this could produce ...
3
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2answers
82 views
Streaming modified lines of a file from a Controller
I am writing a piece of software that aims at streaming the modified lines of an external file located at given uri (and retrieved as a QueryString parameter).
I am trying to minimize the impact of ...
2
votes
1answer
72 views
Simple but important function to check and retry given action's result
What I'm trying to achieve is
Given a predicate function and an action which returns the object to check,
check predicate, retry and fail after numTries .. or success .
Purpose of this function ...
-1
votes
1answer
42 views
#Error Handling- Propagating errors to calling function.
Im new to javascript programming and i am required to make a web app. Node.js will be used as the js runtime environment. In order to minimize the amount of time needed for debugging as the app ...
4
votes
2answers
101 views
Initializing multiple variables with different types using parallel calls
Consider the pattern below, where multiple async calls are made in parallel:
...
1
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0answers
45 views
Async API Function with Mongoose
I'm quite new to the language and I just started using async/await. I've written this function for an API that I'm developing. It checks what is sent by the user, specially the status that he wants to ...
2
votes
1answer
51 views
Javascript class to geocode Dutch addresses
I am relatively new to javascript ES6, the code I've written is working fine. However I am curious if this would be the best approach. I am trying to write a reusable module that I can use in multiple ...
5
votes
2answers
755 views
ForEachAsync extension method (a way to run an async operation on each item of a sequence in parallel)
In a recent project I worked on we faced some issues due to an excess of parallelization (thousands of threads were created and the overall result was a degradation of performance and several spikes ...
1
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0answers
170 views
React widget to display, sort and search remote data
I've created a React widget that pulls data on crypto-token pairs from a remote API and makes that data sortable by headers and searchable.
You can view a demo of it here.
Is this a maintainable way ...
0
votes
1answer
113 views
Asynchronously fetching data from the database
The following C# code is written to fetch the Categories data from SQL Server Database using Asynchronous Task for HttpGet. The Dapper library is used as ORM.
I ...
4
votes
0answers
68 views
pool of python coroutines
Task
control how much coroutines are running simultaneously with ability to stop the process from inside.
Use case
when scraping websites you want to control how much memory program consumes and ...
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0answers
86 views
An `async..await` based way to handle the output of a child process
I've recently answered a question on Stack Overflow where the asker was wondering how to read from the standard out of a child process he was spawning inside a ...
4
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1answer
78 views
Async/Await Computation Expression
When writing asynchronous code in F#, one often needs to call methods in the .NET BCL that return Task or Task<T> rather ...
2
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0answers
136 views
Server app: pinging up to 500 clients asynchronyosly
TCP/IP server which controls up to 500 clients. There's a list of added computers and the server gets this list, selects computers which are not already connected and ping them using host name.
...
1
vote
2answers
896 views
Starting a process asynchronous
For executing a Process I've created an separate class which binds the possibilities together, for example reading output, start as Admin, catch Exceptions and also start all this asynchronous.
Are ...
4
votes
1answer
149 views
CLI to bump package.json version and add git tags
I'm writing a command line app in node.js. At this stage, the app does the following:
Get the version from package.json
Update the package.json with a new version ...
5
votes
1answer
828 views
Asynchronous dictionary in Python
So I am working on writing a discord bot with discord.py.
I decided, rather than making a serie of if/elif, to map the messages to the functions in a dictionnary, like so:
...
8
votes
1answer
76 views
Creating API clients that are “async agnostic”
Python3's async/await syntax is great, but it does create a divide between libraries which are async-based and those which are ...
2
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0answers
570 views
Async/await Mysql wrapper
I used MySQL, but it was inconvenient so I made a wrapper.
It works, but I'm unsure if there are any issues.
Used node module - mysql2, bluebird
sqlWarpper.js
...
3
votes
1answer
1k views
Google Drive upload for large files
I'm using Google Drive API for uploading large disk image files ( >100 GB). My Code uses this wrapper to upload these large files in chunks of 40mb. The files are stored on NAS drive.
The code works ...
1
vote
1answer
138 views
Return combined DTO from async controller
I have an asynchronous controller.
It is supposed to make a couple async calls then return combined data from then as one DTO.
...
3
votes
0answers
44 views
Coordination function
This function started very clean but I had to add requirements:
Added a Stopwatch to only update the caller periodically. I guess that responsibility could be ...
3
votes
1answer
2k views
Simple server using async and HttpListener
I have a program that controls a custom machine. I wanted to add some simple HTTP comms so I could control it from the network or other programs.
My server class is:
...
-5
votes
1answer
140 views
Optimal way to iterate between await operator calls
Is there any cleaner way to implement the following?
...
6
votes
2answers
6k views
Task timer async
I had been still using BackGroundWorker and decided to learn async Task.
My test project is a simple timer that can be canceled.
The target project is to read instruments with a delay for sampling. ...
-2
votes
1answer
32 views
Convert this method into parallel await [closed]
I am using Node.js. I have two different classes. The first one is called Controller, the second is called ServerCommunicator. Controller calls a method in SC (sendDataToDolibarrAsync), which takes a ...
