Attempt: Retry your functions

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Kyek

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Posted 11 June 2012 - 11:01 AM (#1)

Attempt: Retry your functions

My first NPM-published lib!

So I made a quick library called Attempt because I am friggin sick of webservice APIs that fail for no good reason (cough loggly cough). Here's what it looks like:

Instead of this...

logToLoggly("My log message", function(err) {
    if (err) console.log("IT FAILED AGAIN DAMNIT");
    else console.log("Holy crap it worked for once.");
});

Just wrap it in an Attempt, and use 'this' for the callback!

var attempt = require('attempt');
attempt(function() {
    logToLoggly("My log message", this);
}, function(err) {
    if (err) console.log("logToLoggly() failed after 5 attempts.");
    else console.log("Success!");
});

It's way more customizable, but if you want the details, check the readme

Attempt on GitHub

Hope this is useful for more people than just me ;-)

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callumacrae

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Posted 11 June 2012 - 11:17 AM (#2)

Looks helpful! ~~How about an "attempts" parameter?~~just read docs…

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Kyek

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Posted 11 June 2012 - 11:24 AM (#3)

callumacrae, on 11 June 2012 - 11:17 AM, said:

Looks helpful! ~~How about an "attempts" parameter?~~just read docs…

xD One thing I don't call out in the docs is that this is namespaced and usable in the browser, too. Haven't tested that yet, though.

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Fike

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Posted 13 June 2012 - 09:55 AM (#4)

Really interesting, I'm using it in my next project to retry MySQL queries if they happen to fail

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Posted 13 June 2012 - 05:53 PM (#5)

Fike, on 13 June 2012 - 09:55 AM, said:

Really interesting, I'm using it in my next project to retry MySQL queries if they happen to fail

Are you sure that's a good idea? Hitting your database server multiple times with the same query might not be too clever. Why would the query work the second (etc.) time?

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Kyek

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Posted 14 June 2012 - 12:10 PM (#6)

Koen, on 13 June 2012 - 05:53 PM, said:

Are you sure that's a good idea? Hitting your database server multiple times with the same query might not be too clever. Why would the query work the second (etc.) time?

It's handy for remote servers, especially in cases where the query isn't the thing that's likely to be failing. Everything from maxConnections being hit to DNS not responding before the timeout could benefit from a simply retry. With that said, though, I'd definitely set retries to 1 or maybe two for an SQL query.

I have attempt() wrapped around my JsonRPC client, every call that I make to DynamoDB (It's reliable, but prematurely closed connections have happened -- AND I can have onError refresh my auth token), and every call I make to a remote logging service -- but so far, since my remote MySQL server DNS resolves at the first router, I haven't really had a need to put it there yet. I could see it helping in a couple rare situations though

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Quinn

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Posted 19 June 2012 - 06:11 AM (#7)

I love that .gitignore file.

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Kyek, on 07 February 2011 - 07:11 AM, said:

Though anyone who thinks Europe is a country should be smacked in the face. By a train.

callumacrae

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Posted 19 June 2012 - 06:49 AM (#8)

Kyek, lrn2globalgitignore

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Kyek

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Posted 19 June 2012 - 07:26 AM (#9)

Quinn, on 19 June 2012 - 06:11 AM, said:

I love that .gitignore file.

lol, what about it?

callumacrae, on 19 June 2012 - 06:49 AM, said:

Kyek, lrn2globalgitignore

Noooo, that's a silly idea. Globals are convenient, sure, but you can't enforce your global gitignore on everyone who forks and maybe commits to the project. If you check it in, you potentially save yourself some annoyances later. Plus, while Attempt is a fairly simple lib, there are very very few projects I've worked on where I didn't have some project-specific stuff to throw in there

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callumacrae

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Posted 19 June 2012 - 07:28 AM (#10)

Kyek, on 19 June 2012 - 07:26 AM, said:

You're doing it wrong!

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Kyek

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Posted 19 June 2012 - 08:05 AM (#11)

callumacrae, on 19 June 2012 - 07:28 AM, said:

You're doing it wrong!

Your mom is doing it wrong!

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callumacrae

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Posted 19 June 2012 - 08:22 AM (#12)

Kyek, on 19 June 2012 - 08:05 AM, said:

Your mom is doing it wrong!

…

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Quinn

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Posted 19 June 2012 - 03:25 PM (#13)

Kyek, on 19 June 2012 - 07:26 AM, said:

lol, what about it?

Shouldn't you have git ignore that file?

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Kyek, on 07 February 2011 - 07:11 AM, said:

Though anyone who thinks Europe is a country should be smacked in the face. By a train.

gibbonweb

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Posted 19 June 2012 - 04:23 PM (#14)

Quinn, on 19 June 2012 - 03:25 PM, said:

Shouldn't you have git ignore that file?

If git ignored the .gitignore file, how could it ignore the files the .gitignore file tells it to ignore?
Some deep shit right here.

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Quinn

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Posted 19 June 2012 - 05:04 PM (#15)

gibbonweb, on 19 June 2012 - 04:23 PM, said:

If git ignored the .gitignore file, how could it ignore the files the .gitignore file tells it to ignore?
Some deep shit right here.

I don't really know much about Git, but it seems like it would make sense to read the file, ignore whatever the file says to ignore, and then ignore the file automatically.

Else just put .gitignore at the end.

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Kyek, on 07 February 2011 - 07:11 AM, said:

Though anyone who thinks Europe is a country should be smacked in the face. By a train.

Kyek

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Posted 19 June 2012 - 06:26 PM (#16)

That defeats the purpose, though. I *want* it in the repo. That way, others check it out when they fork, and they don't pollute the repo accidentally. If you take a gander through some of the more trafficked repos, the grand majority of them have a .gitignore. It's a very handy way to prevent really annoying mistakes.

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