Join devRant
Do all the things like
++ or -- rants, post your own rants, comment on others' rants and build your customized dev avatar
Sign Up
Pipeless API
From the creators of devRant, Pipeless lets you power real-time personalized recommendations and activity feeds using a simple API
Learn More
-
That would probably be implementing multithreading in shell scripts.
https://gitlab.com/netikras/bthread
The idea (though not the project itself) was born back when I still was a sysadmin. Maintaining 30k servers 24/7 was quite something for a team of merely ~14 people. That includes 1st line support as well.
So I built a script to automate most of my BAU chores. You could feed a list of servers - tens or hundreds or more - and execute the same action on each of them (actions could be custom or predefined in the list of templates). Neither Puppet nor Chef or Ansible or anything of sorts was consistently deployed in that zoo, not to mention the corp processes made use of those tools even a slower approach than the manual one, so I needed my own solution.
The problem was the timing. I needed all those commands to execute on all the servers. However, as you might expect, some servers could be frozen, others could be in DMZ, some could be long decommed (and not removed from the listings), etc. And these buggars would cause my solution to freeze for longer than I'd like. Not to mention that running something like `sar -q 1 10` on 200 servers is quite time-consuming itself :)
And how do I get that output neatly and consistently (not something you'd easily get with moving the task to a background with '&'. And even with that you would not know when are all the iterations complete!)?
So many challenges...
I started building the threading solution that would
- execute all the tasks in parallel
- do not write anything to disks
- assign a title to each of the tasks
- wait for all the tasks to complete in either
> the same sequence as started
> as soon as the task finishes
- keep track of each task's
> return code
> output
> command
> sequence ID
> title
- execute post-finish actions (e.g. print to the console) for each of the tasks -- all the tracked properties are to be accessible by the post-finish actions.
The biggest challenges were:
a) how do I collect all that output without trashing my filesystems?
b) how do I synchronize all those tasks
c) how do I make the inception possible (threads creating threads that create their own threads and so on).
Took me some time, but I finally got there and created the libbthread library. It utilizes file descriptors, subshells and some piping magic to concentrate the output while keeping track of all the tasks' properties. I now use it extensively in my new tools - the ones where I can't use already existing tools and can't use higher-level languages.4 -
I told a guy to implement an algorithm in cpp. He wrote this weird 600+ lines of code which contains only global variables and void functions then I told him to make it object oriented and he just put all those garbage in the class and gave me back and on top of that class name is Template and file name is template.cpp. I don't have words to describe his code. May be this picture can help you understand my state. Oh, if you think this matchOn_r1, r2,r3 are different then you are mistaken they are just different with one argument (one global argument). This is just part of the code. He has this shit all over the place. Why the fuck this kind of people exists?
13 -
oh, I have a few mini-projects I'm proud of. Most of them are just handy utilities easing my BAU Dev/PerfEng/Ops life.
- bthread - multithreading for bash scripts: https://gitlab.com/netikras/bthread
- /dev/rant - a devRant client/device for Linux: https://gitlab.com/netikras/...
- JDBCUtil - a command-line utility to connect to any DB and run arbitrary queries using a JDBC driver: https://gitlab.com/netikras/...
- KubiCon - KuberneterInContainer - does what it says: runs kubernetes inside a container. Makes it super simple to define and extend k8s clusters in simple Dockerfiles: https://gitlab.com/netikras/KubICon
- ws2http - a stateful proxy server simplifying testing websockets - allows you to communicate with websockets using simple HTTP (think: curl, postman or even netcat (nc)): https://gitlab.com/netikras/ws2http -
Why the f*ck do you want custom cursor on the site? It's annoying when suddenly your cursor changes from default. If that's not enough they are increasing size by 2-3 times. I understand if it's a gaming site or web game but why do you want to put this crap on a business site? No need to change the cursor for branding. That's stupid.2
-
A guy asked on an online channel of programmers about buying a laptop and here's the perfect guide from an experienced programmer.
8 -
Fuck Java because java is one of the worst first languages you could pick. In the following I’ll highlight two main issues. One issue, the complexity of Java, will make life more difficult for you immediately, and the other, the danger of developing myopia regarding programming languages and their capabilities, has the potential to hurt you for many years to come and possibly your entire career9
-
Today, I found this in our upstream repo. How the fuck does it even get merged?
No use of tempfile, instead of idiomatic it's idiotic. I have changed that system, now I am hoping i don't have to refactor thia shit.
11 -
A JavaScript developer want to understand my 1000+ lines pythonic python code without any prior knowledge about python and he just want to understand it so that he can translate it into js. What should i do?19
-
I have started a freelance full-stack project with some existing code-base and it was horrible. They only have API endpoints for fetching whole data. No limit, No sort, No filter. They are doing all this shit on the front end. They are even aggregating data on the front end. Seriously who the fuck does that? On top of that the guy who has coded it was a senior developer. I am wondering now, did he write that kind of code purposefully or this kind of shitty devs actually exists?2
-
Why the hell every IT/CS professor teach pattern codes like pyramid, star and many weird kind of designs to do on console? just why? Why don't teach basic implementation Problems which are really going to ask for SDE jobs in most of the companies.8
-
Online Multiplayer Mafia party game built on Ethereum.
Project Type: Existing open source project
Description: I found that most of the blockchain game projects in this space are using traditional web2 technology for hosting gameplay. So, we decided to create a game that utilizes web3 technologies as much as possible for our project and create services like real-time chat, game rooms, player profiles that can be used by other games. These services are very common among modern online multiplayer games and we need a reliable and scalable alternative that uses a web3 tech stack. So, we have decided to create a game that incorporates all these features.
Blockchain smart contracts development is complete. I need help in backend and frontend development. You don't need to have any experience in Blockchain.
Tech Stack: Express.js + React.js + IPFS + Solidity
Current Team Size: 1
URL: https://github.com/cryptomafias/...
Note: We are eligible for a grant from the protocol labs - the company behind IPFS.8 -
I have participated in a hackathon this weekend and one of the theme of hackathon was blockchain and being a blockchain dev i have created a DApps which follows token standard and other security standard but our UI was kind of basic cause we didn't have any designer in our team but one participated team's UI was far better than us but has serious flaws in the smart contract and guess what they are the one being selected and that's not it there wasn't a single judge who has basic knowledge of blockchain.I was using DApp term very often while presenting our idea and one of a judge literally asked us what is dapp? I mean WTF? Now i am regretting why did i participated in this shitty hackathon? On top of all that they juat give a single sticker for whole team. Wtf we are supposed to do? Cut it ? If you are a blockchain dev don't forget to see this beautiful function i found in the token contract of the selected team from the github.
1 -
I spent 2-3 days on debugging code written in assembly script. Apparently, you need to initialise an array using new method otherwise it re-uses the previous array from the same scope and it has created infinitely large array. Just wtf.
And I got error like "wasm blah blah blah blah blah blah".Just give proper error.
Running the environment locally wasn't an option because well it doesn't fucking work locally. So, I have to forcibly test on CI and they have created a site that can show you logs because you can't access or query data directly from server and while debugging you try to log something it randomly works sometimes and sometimes you get output from god knows which deployment. Just create a fucking API for displaying log or build a proper docker so that we test it locally.1 -
How do I get devrant sticker?
I have 50++ on a rant and i have mailed them but i didn't get any reply8 -
I want to learn front-end and i have offers of two bootcamps.please tell me which is better one-month or frontend-masters.
Note: i don't know anything about front-end1
Top Tags
Weekly Rant
View