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Search - "recursive error"
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A sidebar.
Literally just a sidebar.
And yes, this was in Hell.
Its code was spread across at least 40 files, and it used a bunch of freaking global variables to unfurl accordion sections, hide other sections/items, highlight the active item, etc. These were set (and unset!) in controller actions, so if you didn’t unset one, it remained open and highlighted until another action unset it.
Some of the global variable checks (and permissions checks) were done in the individual views, some outside of the `render` statements that include them. Some of them inherited variables from the parent, some from the controller, some from globals. Getting a view to work was trial and error. Oh, and some had their own inline css, some used css classes.
Subsections were separate views, so were some individual items, both sometimes rendered using shared templates, and all of the views and templates had the exact. same. filename. (They were located in different directories, and thus located automagically via implicit relative paths.) So, it was a virtually endless parade of`render partial => “sidebar”`. Which file does that point to? Good luck figuring it out!
Also, comments in several places said adding a new section required a database migration. I never did figure out why.
Anyway, I discovered this because I had an innocuous-sounding ticket to rearrange the sidebar, group some sections/items under different permissions, move some items to another menu, and nest some others differently.
It took me two bloody weeks, and this was when I was extremely productive every day.
Afterward, I was so disgusted by it that I took a day and removed every trace of the sidebar I could find, and rewrote it. I defined the sidebar in a hash, and wrote a simple recursive builder to generate the markup. It supported optional icons, n-level nesting, automatic highlighting of the current item and all parent nodes, compound and inherited permissions, wrapping of long names, hover and unfurl animations, etc. Took me a couple hundred lines of Ruby at the most, plus about the same of css.
Felt so good to remove that blight.5 -
At an interview, the first round was an online coding round. Two questions, one easy one hard, 90 minutes, easy peasy.
I solved the hard one first.
A bit of good logic, followed MVC pattern, all done. Worked flawlessly.
Submitted code. Online compiler threw up an internal error citing java is an invalid command(jdk not found).
Called the invigilators. What I heard next, I couldn't believe this shit.
"We're not responsible for any errors you may be having. Figure it out yourself"
I was like WTF dude. This is not even a compilation or runtime error!
After a heated discussion, I made him look at the code.
Him - what is all this classes and all? Why haven't you written everything inside the main function?
Me - those are model classes. Those are different helper functions. That is a recursive function to avoid 5 for loops and use divide and conquer. Ever heard of OOP? what kind of person writes a 300 line program inside one function?
Him - no no we write it like that only. Correct this.
Me - I fit everything inside the main function. Still the same error, java not installed. Called the idiot to have a look at it.
Him - yeah your code is wrong.
Me - may I know what's wrong with it? Can you fix it please?
Him - no no we aren't allowed to see the code (he had already read it twice. It was compiling and running perfectly, locally) .
Yeah you solved only 1 problem, you were supposed to solve 2.
Me - yes because the rest of the time I had the pleasure of your company. (It isn't everyday that I see talking buffoons.)11 -
At work, all errors within the site are logged into our database with a subject and error column. SQL errors are logged in the subject field while the traceback is put in the error column. However, a lot of SQL errors are really large and exceed the max character width of the subject field, causing yet another SQL error, and the cycle repeats. This recursive error has been the bane of my existence, because 1) it times my local dev instance out and 2) the error doesn't end up getting logged because the server both freezes and the error can't be inserted in the database. You can't even begin to imagine how many hours I've wasted trying to find what line I changed cause total and utter failure with absolutely 0 error logging. Next thing on my todo list is to fix this fucking issue since the head dev refuses to get it done.2
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Usually, when I programme for myself or in a German-only team and they agree, I/we do it in German because it makes naming things much simpler (no naming conflicts, never, and a strict visible separation between your code and libraries).
This time, I thought: "Nooo, let's do it in English, because, you know, reasons and it fits into the situation"...
Booom, stack overflow!
"How in the hell did that happen?" I never had a stack overflow before outside of recursive programming.
And what was it? I had made a class to encapsulate an API, added a property with getter and setter, naming in English and similar to the said API... very similar... in fact, the property had the same name as the API function, resulting in a getter calling itself over and over again.
This was a harmless mistake, and found very quickly, but it's interesting so see how a habit (or working method) probably prevented similar or worse sources of error in the past.3 -
Try to finish some of the projects I've started in 2018. Right now I have a todo list text file, along with multiple written lists (the written ones are more focused on a single project normally).
-Finish the startpage I've been doing off and on for at least a month now. I ended up making a lot of it command based (just need to write the scripts for the commands..). I had a little config menu but I just got tired of it and the text box is autofocus anyways, so I figured I'd make it command focused.
-Nice little root safety script as I call it. I've made very stupid mistakes as root before. I once made a typo and ran "chmod --recursive 644 /" while half asleep. I believe I was trying to run that on the current directory I was in, but as you know, the . and / are right next to each other. Basically the script would see what you're doing and echo "you're about to do x, are you sure that's what you want to do?". Something I know I could knock out in a day, but I've been putting it off for at least a year now.
-Compiling notification. I saw something similar once a few years ago, and it was so fucking cool. I remember it being a Mac, and it had a notification that would basically tell you how many files and shit you had left to compile if you were building something. Kinda want to build something for polybar.
-FUCKING RUBBER DUCK DEBUGGING TO THE EXTREME! This one was inspired by a comment someone made once months ago. Might have been here, or reddit, or in real life, not sure. Basically a big ass fucking rubber duck with LEDs in it that will like glow red if your code wouldn't compile (I think Visual Studio has like an automatic error detecting thing in there?? Maybe something similar if I can figure that out). Honestly not sure how the fuck I'd do this one, but I love the idea and I really want to fucking do it
There's more shit. These are just the main ones I want to attempt sometime in the near future. -
You might need to take a break when you get a "max recursion depth exceeded" error when you weren't even trying to build a recursive function.5
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Possibly my favourite function is Clojure's "recur", which isn't really a function at all, but a special form that gives you a guaranteed tail-position call to the current function.
Basically what that means is you can write recursive functions (functions that call themselves) and know that you're not creating a potential stack overflow.
Um. Okay, I can feel people looking at me like 🤔 Basically what *that* means is: normally when a function calls another function, a "stack frame" is allocated, holding all the local variables for that call. If a function calls itself 1000 times, 1000 stack frames get allocated. "Tail call optimisation" is a process by which if you call yourself as the very last thing in a function, the language doesn't need to remember the current frame; it just has to pass the return value upwards. The trouble is, it's sometimes hard to notice that you've turned a tail-call optimisable function into a non-optimisable one. Clojure's recur keyword makes it explicit, and therefore safe: if you try to do anything with the return value of recur, it's an error.
PS I'm sure another language did explicit TCR first, but Clojure is where I first saw it.6 -
So I have this code written in node:
Function connect(){
const client = net.blahblah
client.on('close', () => {
Connect()
}
}
As the connect is called from within the close call back, it wouldn't be recursive right? Like if it disconnected a million times, it shouldn't throw a recursion error or use up a bunch of memory right? Or am I thinking about it wrong?2 -
Mount an azure file share in an app service container? Sounds handy. Nice clicky-draggy wizard to set it up, pick your file share, type a path to mount it to, hit save.
And does it work?
Does it buggery.
And is there a helpful error message so you can see what you've done wrong?
In a pig's arse is there a helpful fucking error message.
"Application error", and a link to some "diagnostic resources" that displays the exact same error message, including the same link, so a link to itself, in an infinite recursive loop of rank, inhuman stupidity.
Let me see what's in the logs. Absolutely fuck all. No, wait! There's the html markup for the fucking useless error message I'm looking at in the browser. So the UI is telling me to fuck off, and the logs are recording that I have been told to fuck off.
But this is Azure. So there isn't just one place to look at the logs, there are many places to look at the logs. And they are all geologically slow and most of them don't work.
It's probably a firewall issue. I'll have a look later on if I can be arsed, but frankly I'd rather be performing cunnilingus on a lion.1 -
My work product: Or why I learned to get twitchy around Java...
I maintain a Java based test system, that tests a raster image processor. The client is a Java swing project that contains CORBA bindings to the internal API of the raster image processor. It also has custom written UI elements and duplicated functionality that became available in later versions of Java, but because some of the third party tools we use don't work with later versions of Java for some reason, it's not possible to upgrade Java to gain things as simple as recursive directory deletion, yes the version of Java we have to use does not support something as simple as that and custom code had to be written to support it.
Because of the requirement to build the API bindings along with the client the whole application must be built with the raster image processor build chain, which is a heavily customised jam build system. So an ant task calls out to execute a jam task and jam does about 90% of the heavy lifting.
In addition to the Java code there's code for interpreting PostScript files, as these can be used to alter the behaviour of the raster image processor during testing.
As if that weren't enough, there's a beanshell interface to allow users to script the test system, but none of the users know Java well enough to feel confident writing interpreted Java scripts (and that's too close to JavaScript for my comfort). I once tried swapping this out for the Rhino JavaScript interpreter and got all the verbal support in the world but no developer time to design an API that'd work for all the departments.
The server isn't much better though. It's a tomcat based application that was written by someone who had never built a tomcat application before, or any web application for that matter and uses raw SQL strings instead of an orm, it doesn't use MVC in any way, and insane amount of functionality is dumped into the jsp files.
It too interacts with a raster image processor to create difference masks of the output, running PostScript as needed. It spawns off multiple threads and can spend days processing hundreds of gigabytes of image output (depending on the size of the tests).
We're stuck on Tomcat seven because we can't upgrade beyond Java 6, which brings a whole manner of security issues, but that eager little Java updated will break the tool chain if it gets its way.
Between these two components we have the Java RMI server (sometimes) working to help generate image data on the client side before all images are pulled across a UNC network path onto the server that processes test jobs (in PDF format), by reading into the xref table of said PDF, finding the embedded image data (for our server consumed test files are just flate encoded TIFF files wrapped around just enough PDF to make them valid) and uses a tool to create a difference mask of two images.
This tool is very error prone, it can't difference images of different sizes, colour spaces, orientations or pixel depths, but it's the best we have.
The tool is installed in both the client and server if the client can generate images it'll query from the server which ones it needs to and if it can't the server will use the tool itself.
Our shells have custom profiles for linking to a whole manner of third party tools and libraries, including a link to visual studio 2005 (more indirectly related build dependencies), the whole profile has to ensure that absolutely no operating system pollution gets into the shell, most of our apps are installed in our home directories and we have to ensure our paths are correct for every single application we add.
And... Fucking and!
Most of the tools are stored as source bundles in a version control system... Not got or mercurial, not perforce or svn, not even CVS... They use a custom built version control system that is built on top of RCS, it keeps a central database of locked files (using soft and hard locks along with write protecting the files in the file system) to ensure users can't get merge conflicts by preventing other users from writing to the files at all.
Branching is heavy weight and can take the best part of a day to create a new branch and populate the history.
Gathering the tools alone to build the Dev environment to build my project takes the best part of a week.
What should be a joy come hardware refresh year becomes a curse ("Well fuck, now I loose a week spending it setting up the Dev environment on ANOTHER machine").
Needless to say, I enjoy NOT working with Java. A lot of this isn't Javas fault, but there's a lot of things that Java (specifically the Java 6 version we're stuck on) does not make easy.
This is why I prefer to build my web apps in python or node, hell, I'd even take Lua... Just... Compiling web pages into executable Java classes, why? I mean I understand the implementation of how this happens, but why did my predecessor have to choose this? Why?2 -
I used to think that programming was just straight forward coding what you need.
But now I think it's describing the problem and writing code to solve that problem.
Example: recursive function. It calls itself till it finds a solution or till no options are left. You don't know the answer, but you code something that can find it for you.
Or php, you don't create every single html page, that's done by php dynamically.
The great thing is, it's less work and it is easier to catch error scenarios.
The bad thing is it has become a bit more abstract. -
When an error page fails to download a file crucial to the error page and there's nothing in the logs2
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Ok. I GIVE UP! ...for at least a couple hours...
I'm not a big believer in... well anything suitable to the literal definition of believe. But there's only so much 'wtf? How is this even possible?' and any answer u can come up with is nearly statistically impossible...
I am a neuro-atypical (and just extremely atypical even if i somehkw was neurotypical) being, based on logic, finely calculated statistical probability and the most raw data and as unbiased as realistically possible, algorithms and interpretation (usually recursive pattern recognition with several highly detailed historical sources.
...but at some point statistical improbability and a collation of separate, yet relatively closely occuring events/circumstances makes logic, itself a primary suspect of corruption.
What was the breaking point that caused me to (temporarily) give up and tell logic to f off for a bit cuz maybe the illogical and mythical is the real logic, leaving me in a losing battle with 'the' fates?
Trying to get all my sourcing/purchase orders in/paid for/on the literal boats b4 end of the workday/week in china...
1st, had to drop a supplier cuz they have limited reps. When the one ive had 7+ years left, i got the aloof blonde girl societal trope of a rep... who for the 2nd time (despite the several very blunt complaints above her, incl me) she sent out a promotional update to the entire client list (ie, inherently competitors) as CC not BCC... over 200 business email accounts with tailored info of their sourcing.
2- totally diff company/ industry a former rep i was glad be rid of apparently just sfarted back for "awhile" as i needrf to restock/scale...apparently she forgot everything we discussed at length... lke if you want a chance on my business im not gonna be wasting time looking through your gui "mini store to then inquire about everything individually insead of a simple spreadsheet(which i print and put in a 3-ring binder rotating current catalogues in the same format i require everywhere)
3.dog was an ahole, my packed schedule got delayed and morphed.. a bunch of little bs thatd normally have no extra thought impact, hyperfocused forgetting one of my alarms til i realised my idiopathic fever was back and i didnt take/apply meds (pain/muscle relaxers mainly so despite this odd free time and needing to shower. I gotta sit on my rear, leg elevated/non-productive far 40min b4 i can shower (as functional legs and lack of syncope is almost a req to shower)
4. A new-ish rep of a company/factory i like/respect enough to not mention in relation... he makes invoice 1.. slight error thst was easily resolved...#2 was flawless... he goes to officially generate the contract(alibaba... verrrry simple with lots of extra explanation buttons). Price and all items match, its near workweek end so i was waiting for it so i could quickly pay/have it on the boat b4 it left and few fdav days are behind...
I put in card info, get to the 2 cbeck boxes (imo should be only 1 but whatever) asking if billing address is same ss delivery(its always default yes)... then i see a few lines in chinese (i can read enough for business negotiations... typical words/sentences innately look different than things like individual letters/address and postal indicators.) After a few loops of double checking, mentally trying to dismiss my i Intial judgement cuz it'd be too ridiculous... even resorted to google .... nope... initial wtf was spot on... recipient name/address was indeed the company(multi factory producer)i was purchasing a wholesale, via sea freight, bulk of products from.
Im pretty sure the system would've flagged it as an invalid contract within an hr... but seriously... ive been handling alibaba (and other) international sourcing since before high school(mainly small businesses i made sites/little tools for that found anything with a light up screen intimidating) and a purchase then shipment to the originating company/factory actually entered into a contract(the form is sooo simple)... im faced with ridiculously improbable obstacles actually existing and changing in such nonsensical statistically improbable ways so often that 1. I wouldn't trust a dr (or most humans) that didnt 1st assume i was crazy of some form...unfortunately im not, despite hkw much simpler and probable itd be 2. Id be super suspicious/converned if statistic norms were my norm for over a day.
But seriously wtf???
Someone give me some wisps of a frame of ref here... where's a typical 'fuck this, im out!' Breaking point?1