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<FromGitter>
<sdogruyol> a quite day here :P
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<FromGitter>
<bew> crystal is so intuitive no question needed :p
<FromGitter>
<jwoertink> lol. I wish I could say that. I have a question about something every 5 seconds. I'm just trying not to get kicked out of the chat from a load of stupid questions hahah
<FromGitter>
<bew> ahahah >< :D
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<FromGitter>
<bew> feel free to ask @jwoertink
<FromGitter>
<sdogruyol> Yeah
<FromGitter>
<jwoertink> I'll actually move over to the kemal chat for some of these
<wmoxam>
~~~]
<wmoxam>
~~~*
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<FromGitter>
<redcodefinal> Is there a way to do type restrictions for generics? I want to do something like ⏎ ⏎ ``` code paste, see link``` ⏎ ⏎ I get the error that "T is not a class, T is a T" so I figured that if there was a way to restrict T to be of type A.class or typeof(A) that it would allow this. [https://gitter.im/crystal-lang/crystal?at=58ee61d8a0e4856242fa467e]
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<FromGitter>
<redcodefinal> Well I guess I should start with can you inherit from a generic?
<FromGitter>
<asterite> You can, but the compiler is very buggy in that respect, I would advise against that
<FromGitter>
<redcodefinal> Darn I guess I'
<FromGitter>
<redcodefinal> I'll have to figure out another way
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<FromGitter>
<redcodefinal> is there a way to find out if a class responds_to? an instance variably inside the class? `:@instance_variable` doesn't work since I guess `@` isnt allowed in symbols. ⏎ ⏎ ``` code paste, see link``` [https://gitter.im/crystal-lang/crystal?at=58ee730ab52518ed4d0659ec]
<FromGitter>
<Sija> @redcodefinal you can check existence of a method, not an ivar
<FromGitter>
<redcodefinal> ok ty i guess I'll have to go about it a different way
<FromGitter>
<Sija> why not `responds_to?(:test)`?
<FromGitter>
<redcodefinal> Yeah that was my second option but it would have been a little cleaner to test an ivar instead but ultimately I guess I'll need to expose it. I'm playing around with some DSL stuff right now
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<FromGitter>
<KCreate> Hey, I have a question about fibers in general and also have a concrete issue I'm trying to solve.
<FromGitter>
<KCreate> Suppose I have a while-loop which does some expensive computations and a signal handler for `Signal::USR1`, the signal handler is never called because the main fiber doesn't give control back to the signal handler ⏎ ⏎ How could I make that work? ⏎ ⏎ ``` code paste, see link``` [https://gitter.im/crystal-lang/crystal?at=58ee78e5bdf4acc11252e8af]
<FromGitter>
<chuckremes> @KCreate You are going to need to call `Fiber.yield` somewhere in your `do_something_expensive` call. If it’s a single monolithic computation that can’t be interrupted then you are SOL. If you can divide it up into steps, call yield between the steps to give other fibers a chance to run. Remember that fibers are *cooperatively* scheduled so you need to be a good citizen.
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<FromGitter>
<KCreate> > Remember that fibers are cooperatively scheduled so you need to be a good citizen. ⏎ That made it super clear to me, I'll see what I can do
<FromGitter>
<KCreate> damnit markdown formatting
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<crystal-gh>
[crystal] asterite pushed 3 new commits to master: https://git.io/vSDpO
<FromGitter>
<asterite> When parallelism lands that will work well, because the signal handler will probably run in another thread
<FromGitter>
<fridgerator> :thumbsup:
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<FromGitter>
<KCreate> Super hyped for that!
<FromGitter>
<chuckremes> @asterite Is the `thread-support` branch in good enough shape for early adopters to start testing code? I note that the last commit was a little over a month ago… maybe you guys have a bunch of local branches with changes that haven’t been pushed yet.
<FromGitter>
<asterite> There's single-msqueue too, but it's not ready for testing yet
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<RX14>
@asterite what's the single-msqueue branch for?
<FromGitter>
<carsonbaker> Hi.. can someone help me figure out how to implement .shutdown in the code I just posted? I'm a little confused.
<RX14>
`@server.close`
<FromGitter>
<carsonbaker> I don't know how to break out of the loop in the #start method. Because @server.accept blocks, it seems weird. I want to sort of.. cancel the @server.accept call.
<FromGitter>
<carsonbaker> Oh, duh. So @server.close will make the #accept method return. Sorry, I don't know why I didn't see that.
<RX14>
accept will raise when you call `@server.close`
<RX14>
if you want it to return use accept?
<FromGitter>
<carsonbaker> Gotcha. Thanks much. I feel silly.
<RX14>
I find the best way to accept sockets is this:
<FromGitter>
<bew> @RX14 you see it as another constructor? Or as THE constructor (replacing the one with host/port)?
<RX14>
how would it replace it?
<RX14>
there's no way to specify a host/port
<FromGitter>
<bew> Hmmrightmm, let's go to sleep now...
<FromGitter>
<jwoertink> but you could at least buy me dinner first :p
<FromGitter>
<elorest> @bew I believe that currently you just specify a port.
<FromGitter>
<carsonbaker> is there a built-in programmatic way to tell if i'm running "crystal spec" vs an ordinary execution? i guess I could make something up where I set ENV["testing"] = true in my spec_helper.cr file...
<FromGitter>
<bew> @carsonbaker why do you need that?
<FromGitter>
<carsonbaker> i just wanted to change my log level when testing.
<FromGitter>
<fridgerator> I usually set an env flag like you mentioned
<FromGitter>
<carsonbaker> sounds good.
<FromGitter>
<bew> Why we `can't reopen enum and add more constants to it` ?
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<FromGitter>
<jwoertink> Is there a way to get a list of valid encodings for a string?
<FromGitter>
<luislavena> @carsonbaker there is no differentiation. You can add something to `spec_helper.cr` (say override the default logging level)
<FromGitter>
<carsonbaker> cool. thanks luis.
<FromGitter>
<luislavena> @jwoertink can you provide a bit more of context on what you are trying to achieve?
<FromGitter>
<jwoertink> There's this string in ruby that I'm trying to match up in crystal
<FromGitter>
<jwoertink> if I call bytes on them, they are both the same
<FromGitter>
<jwoertink> but in ruby, the encoding is ASCII-8BIT
<FromGitter>
<jwoertink> I'm assuming in crystal it's UTF-8
<FromGitter>
<jwoertink> this string gets passed to `OpenSSL::Cipher`
<FromGitter>
<jwoertink> and I get different results between the two
<FromGitter>
<luislavena> @jwoertink Crystal default encoding is UTF-8, you can change encodings by using `.encode` or `.new(bytes, encoding)`
<FromGitter>
<elorest> that isprime hosting looks pretty good.
<FromGitter>
<elorest> is it much harder to use that digital ocean and aws?
<FromGitter>
<luislavena> @jwoertink the encoding names are the ones supported by iconv, let me find you a reference
<crystal-gh>
[crystal] MakeNowJust opened pull request #4280: Fixed #4278: String#underscore with digit (master...fix/string/underscore-with-digit) https://git.io/vSyaA
<FromGitter>
<luislavena> `iconv --list` on the console (Linux) should provide you a list of supported encondings. AFAIK `ASCII-8BIT` is simply `ASCII`
<FromGitter>
<luislavena> @jwoertink a direct link to sample array of bytes will be enough (honestly don't have the time to digest all the above links)
<FromGitter>
<jwoertink> in this case `secret` comes from `secret = key_generator.generate_key("encrypted cookie")`
<FromGitter>
<luislavena> @jwoertink please note that Ruby indicates ASCII-8BIT encoding sometimes to something that is a binary, it might not be a valid ASCII string
<FromGitter>
<jwoertink> not sure if that makes a difference or not
<FromGitter>
<luislavena> can we ignore for a second the encryption part?
<FromGitter>
<jwoertink> yeah
<FromGitter>
<luislavena> you're trying to build a string from the output of the encryption box, so the decrypted byte array should be the plain text you encrypted, that is correct?
<FromGitter>
<luislavena> I took the bytes you gave and did this:
<FromGitter>
<jwoertink> Ultimately, the goal here is that you log in to a rails app, rails created a session cookie, then you go to a kemal app, that cookie is deserialized
<FromGitter>
<jwoertink> and then vice/versa
<FromGitter>
<jwoertink> so I want to mimic what rails is doing when encoding the session, but I get different values
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<FromGitter>
<luislavena> @jwoertink you might want to read how the Splice folks worked that out. the first thing (and that is the new Rails default) is that the cookie is in JSON format, so can be serialized-deserialized across languages
<FromGitter>
<luislavena> (instead of Marshal)
<FromGitter>
<luislavena> Now, the encrypt+sign part shouldn't be complicated, but usage of strings to handle that part might lead into errors.
<FromGitter>
<jwoertink> right. I was reading that article by matt on that
<FromGitter>
<carsonbaker> I would think the print from server. cr should be "0x01 0x81" but instead I get "01 4a". What's up with that? I'm missing something important.
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<FromGitter>
<carsonbaker> This, interestingly, does *not* happen if I don't layer in SSL.
<FromGitter>
<carsonbaker> It's like every byte over 0x80 gets randomly changed to something else.
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<FromGitter>
<carsonbaker> If I send `01 02 03 79 7a 7b 7c 7f 80 81 82 83 84 85 86 87`, then I receive `01 02 03 79 7a 7b 7c 7f 01 c2 83 c4 85 c6 87`.