crystal-lang/crystal

The Crystal programming language | http://crystal-lang.org | Fund Crystal's development: http://is.gd/X7PRtI | Docs: http://crystal-lang.org/docs/ | API: http://crystal-lang.org/api/

Jonathan Silverman

@mixflame

similar uploader for this feature tho

@me:ky.rs

[m]

just a wild guess from glancing at their api + all the api madness ive seen out there: maybe put formdata.field("type", "dtg") as the first field?

Jonathan Silverman

@mixflame

ok! i will try that

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@FromIRC

<Guest59> Hi

Ali Naqvi

@naqvis

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@FromIRC

<oz> v

<oz> oops, sorry. Wrong window.

G. Gibson

@mistergibson:matrix.org

[m]

is there a source build path for the arm64 arch?

I've got a Raspberry Pi 400 running Ubuntu and would like to add crystal

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@FromIRC

<straight-shoota> You can cross compile from a x86 system

<straight-shoota> https://danilafe.com/blog/crystal_on_arm/

<straight-shoota> @mistergibson ^

Daniel Worrall

@Daniel-Worrall

I've got a docker image of arm64 alpine https://hub.docker.com/r/danielworrall/crystal

Dockerfile in here https://github.com/Daniel-Worrall/crystal-build

Daniel Worrall

@Daniel-Worrall

Can either use it in rpi docker, or use it to build for ubuntu without cross compile

Daniel Worrall

@Daniel-Worrall

Okay, I don't have a Comp Sci background, so hopefully this isn't a dumb question. Would a binary cross compiled result in the same binary compiled locally assuming they're both static/release/etc/source version/target version

G. Gibson

@mistergibson:matrix.org

[m]

the arm procedure didn't work for me -- I'll keep trying. Any idea when an official arm64 build will be forthcoming?

Daniel Worrall

@Daniel-Worrall

If you check out the dockerfile, you can see the usual hardships with cross-compiling, specifically the compiler. libcrystal.a for example, which is being removed in future crystal builds

Also uses alpine to avoid problems with dynamic linking

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@FromIRC

<straight-shoota> > Would a binary cross compiled result in the same binary compiled locally assuming they're both static/release/etc/source version/target version

<straight-shoota> Yes, should have the same result AFAIK

<straight-shoota> Code is generated by LLVM and that should operate the same way, whether it's building for the native architecture or a different one

Daniel Worrall

@Daniel-Worrall

So, I had an answer in the crystal discord. Reproducability (byte-for-byte) is a complicated issue, but the programs will be "the same"

Isaac Sloan

@elorest

Is there a better way to do line 2 of this? A way to take advantage of the fact that the compiler already knows what type the value is supposed to be.
https://carc.in/#/r/bb91

Kirk Haines

@wyhaines

@elorest: I don't know if this qualifies as "better"....

class Array
  def t
    T
  end
end

arr = Array(Hash(String, String | UInt64 | Int64 | Float64)).new
arr << arr.t.new

It's shorter, but calling the method that was added to Array #t is not particularly clear, and it is dependent on implementation details, but it does take advantage of the type of the array already being known. It could maybe be made less objectionable with:

class Array
  def add_new_value(*args)
    self << T.new(*args)
  end
end

arr = Array(Hash(String, String | UInt64 | Int64 | Float64)).new
arr.add_new_value

Or something kind of similar to that.

Generally, reopening standard lib types to add things is risky business, especially when they depend on other implementation details.

Isaac Sloan

@elorest

@wyhaines Yeah I generally try to avoid that. I was hoping there was something more general with types and aliases. Thanks though.

Sung-Chul Lee

@sclee15

Will CrystalConf unvail videos on YouTube? I am a Crystal user from South Korea. Since the event time starts up at 12AM in my timezone. I cannot attend the live event.

Kirk Haines

@wyhaines

I don't know of any standard method that gives you the type that an array stores, unless you go and create one yourself as above.

You could finagle something with a macro and typeof, which might also be reasonable if you are repeating the above pattern A LOT, but it also won't be particularly pretty in implementation).

Ali Naqvi

@naqvis

@elorest https://carc.in/#/r/bbag

1 reply

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@FromIRC

<yxhuvud> @wyhaines: typeof(array.first), but yes, it is not super pretty.

3 replies

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@FromIRC

<yxhuvud> hrrm. Monkeypatching certain things would be easier if kernel.cr didn't execute as much directly in the top scope. :⁠(

ddd

@Dan-Do

Can we spawn fibers on GPU instead of CPU?

George Dietrich

@Blacksmoke16

i remember seeing a shard that allowed using GPU for stuff, but not sure if it's applicable here

ddd

@Dan-Do

:thought_balloon:

thinking :)

ddd

@Dan-Do

okay, can we do this?

done = Channel(Nil).new
spawn do
  call_next(context)
ensure
  done.send nil
end
select
when done.receive
  # print content
when timeout(34.seconds)
  # how to print stack trace to investigate which code causes long processing
  raise "Server could not process_request in 34 seconds"
end

George Dietrich

@Blacksmoke16

for what reason?

ddd

@Dan-Do

I don't know it is because of db, or pooling or business logic processing...

the call_next(context) is more or less like your Athena's Controller

Ali Naqvi

@naqvis

@Dan-Do there is no way, timeout will happen on channel, so it got no relation with any specific fiber

George Dietrich

@Blacksmoke16

not entirely, thats more of how the other frameworks work. I.e. an Array(HTTP::Handler)

Ali Naqvi

@naqvis

what you need is detailed logging inside your logic, so that you can capture detailed information and see what is happening or what is causing the delay

ddd

@Dan-Do

Ok I will go with logging. Can I narrow the log by just logging the fibers which has running time longer than ex 30.seconds

I don't see any method like Fiber.current.running_time

Ali Naqvi

@naqvis

simple approach would be

start the timer before you call call_next
Log fiber-id and other specific details like what work its doing
after method returns, log the time it took to process the request

ddd

@Dan-Do

Yes, thanks.

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