00:03 <FromGitter> <kingsleyh> I would say - self

06:45 <FromGitter> <sam0x17> how do I "concatenate" two slices to get a new slice that is slice1 + slice 2?

06:59 <FromGitter> <proyb6> Slice of what type?

07:00 <FromGitter> <sam0x17> UInt8

07:01 <FromGitter> <sam0x17> all I actually need to do is prepend to the beginning of a Slice(UInt8)

07:02 <FromGitter> <sam0x17> I expected the compiler to let me + tem together but alas no, and the copy_to / copy_from methods don't seem to do what I want either

07:02 <FromGitter> <sam0x17> *them

07:45 <oprypin> sam0x17: again, what are you actually trying to do? I'm curious about the situation where you specifically need to prepend to a slice. and is it just once, or more?

07:47 <oprypin> probably could do some ugly combination of realloc, pointer math, copy_to

07:48 <oprypin> oh but that's just for appending. prepending is such a pain

08:01 <FromGitter> <sam0x17> some stuff involving AES encryption... adding a nonce to the beginning of the data in my encrypt method

08:07 <FromGitter> <sam0x17> the exact method: ⏎ ⏎ ```code paste, see link``` [https://gitter.im/crystal-lang/crystal?at=5c21e55923323d58bd20067c]

08:09 <FromGitter> <sam0x17> excuse the funky variable names -- I'm trying to maintain parity with a well known C++ example

08:09 <FromGitter> <sam0x17> @oprypin ^

09:04 <FromGitter> <sam0x17> for now I am appending instead of prepending, since it shouldn't really matter for a nonce, but still curious what the proper solution is

12:04 <oprypin> sam0x17, in C they dont have any way to prepend so i'd be really surprised that the API requires it. would it be possible to find an example in C and adapt it?

12:05 <oprypin> merging two slices could indeed be useful, strange that that's missing

12:07 <yxhuvud> sam0x17: refactor. Create an output buffer that you write to, that you start off by writing the nonce. Then write encrypted data to the buffer.

12:09 <oprypin> yea

14:26 <FromGitter> <proyb6> What is the Ruby JSON.dump equivalent in Crystal?

14:34 <FromGitter> <bararchy> parsed = JSON.parse(json_string) ⏎ parsed.to_s # this is the "dump"

14:44 <FromGitter> <proyb6> I see, thanks!

17:10 <FromGitter> <asterite> JSON.dump should be `to_json`...

18:35 <Jenz> kingsleyh, you here? I'm getting this "Warn ] receive invalid message, will be ignored" message, playing with the sushichain testnet

19:06 <FromGitter> <kingsleyh> Hi Jenz - what are you doing when that message occurs - it’s a warning so not a big problem unless you are expecting the message to be sent

19:10 <Jenz> sushim -n $testnet -w $wallet --testnet --process 32

19:14 <FromGitter> <kingsleyh> Wow 32 threads!

19:14 <FromGitter> <kingsleyh> 32 processes !!

19:15 <FromGitter> <kingsleyh> I’ll have a look

19:16 <Jenz> With cpu-usage limited to 256% though, hehe

19:34 <FromGitter> <kingsleyh> the warning occurs when the miner is communicating with the blockchain over a websocket - I'll try to reproduce it and see what the underlying Exception is

19:47 <Jenz> Ok, happened again, this time with 16 processes

19:58 <Jenz> Though it happened much later after launch, than with 32 processes

20:28 <Jenz> Should probably also mention all processes are cancelled together with that warning, so it should rather be an error shouldn't it?

21:32 <FromGitter> <kingsleyh> Yeah sounds like a communications problem

21:34 <FromGitter> <kingsleyh> You could try starting a local node and repeating the same test - this would help to understand if it’s a networking issue.

21:34 <FromGitter> <kingsleyh> I’ll investigate further tomorrow

22:19 <FromGitter> <sam0x17> @yxhuvud this is good advice -- thanks -- should I use a new slice as the output buffer? How do I write a slice at a particular position?

23:07 <literal> so why doesn't this work? https://gist.github.com/hinrik/37921b9b2cb1668be6843e32ace1eb78

23:07 <literal> what are the rules for how complex the conditional can be for Crystal to know which types the variables can be?

23:33 <FromGitter> <j8r> literal: https://play.crystal-lang.org/#/r/5urg

23:33 <FromGitter> <j8r> What's the prob?

23:34 <literal> j8r: uncomment the failing code: https://play.crystal-lang.org/#/r/5urh

23:42 <FromGitter> <j8r> I don't know :/

23:44 <FromGitter> <proyb6> @asterite Ah, I guess it as much thanks!