Clojurians Log v2

Alright. Thankfully someone can help me out before I pull my hair out. I have this very odd issue. I'm using aleph/manifold to connect to a websocket, and s/consume doesn't seem to be triggering at all and I really don't know why. Evaluating each relevant line one at a time works from the repl, just not within a function. Here's the exact line that doesn't trigger: https://github.com/eslachance/dithcord/blob/master/src/dithcord/core.clj#L121

what's the manifold version?

@dm3 I just have [aleph "0.4.1"]

@eslachance what does printing the stream that you consume show?

e.g.

boot.user=> (manifold.stream/stream)
<< stream: {:pending-puts 0, :drained? false, :buffer-size 0, :permanent? false, :type "manifold", :sink? true, :closed? false, :pending-takes 0, :buffer-capacity 0, :source? true} >>

after you start consuming the stream, it should have a :pending-takes 1 and :closed? should be false

and :drained? should also be false

When I call that function (ws-connect) it returns the session, which has the stream as a socket

and printing out (:socket @session) does show that stream

ws is the stream you're consuming

yes which I have as (swap! session assoc :socket ws)

let me see about drained

what happens if you just do

(let [x @(http/websocket-client "<wss://gateway.discord.gg/v?6&amp;encoding=json>")]
  (s/consume #(println "DEBUG" %) x))

.... nothing

well sorry it returns nil to be precise

yes

which means you are not receiving anything on that URL?

nothing else, no message, not output.

what if you try another WS client?

like https://chrome.google.com/webstore/detail/simple-websocket-client/pfdhoblngboilpfeibdedpjgfnlcodoo?hl=en

But I am though if I do

(def conn @(http/websocket-client "<wss://gateway.discord.gg/?v=6&amp;encoding=json>"))
(s/on-closed conn (fn [] (prn "closed")))
(s/consume (fn [msg] (prn msg)) conn) 

I get a first packet, and then I get a closed message after a second or so because the websocket is expecting an identity packet

which, if I provide it, does work

So I'm receiving packets fine when I def the connection. But when I use let it doesn't work

that doesn't affect anything

I was previously using http.async.client , which worked fine except for the fact that it crashes the websocket on large packets (a bug in the java lib it uses)

so you have some code using aleph that works?

I do. those 3 lines work

That's the packet

and you are saying that

(let [conn @(http/websocket-client "<wss://gateway.discord.gg/?v=6&amp;encoding=json>"))]
  (s/on-closed conn (fn [] (prn "closed")))
  (s/consume (fn [msg] (prn msg)) conn))

hmm

wait a sec. no it does.

...

but...

(let [x @(http/websocket-client "<wss://gateway.discord.gg/v?6&amp;encoding=json>")]
  (s/consume #(println "DEBUG" %) x)) 

the heck?

maybe there was no packet?

try looking with wireshark or something?

I don't even know what that is >.<

but really I know this API

we're talkinga bout Discord here it always sends a packet

consistently

the URL is wrong

OH MY GOD

...

Thank you.

I shall take my shame and go fix the error

happens 🙂

Obviously, this does bring to light that aleph doesn't have an "on-error" event cough

(well manifold doesn't?)

it's probably closing the stream, no?

and there's https://github.com/ztellman/manifold/issues/95

which has no definite answer

True, but when a websocket closes, it has a reason to close. Getting that reason would be... useful.

agree

I mean we have s/on-close why not s/on-error. I feel that's expected, and consistent.

And also consistent with other libraries

you can contribute to the issue above

all thoughts welcome 🙂

Obviously!

Once I get this all working I'm planning a series of video tutorials on various things clojure-related in the shape of a development story for my library

But that's once I get it working ^_^

Any way to handle a zlib compressed packet? It shows up as #object["[B" 0x7282913c "[B@7282913c"] if I just print it to console, not exactly sure how to handle that

I guess you need to decompress it yourself

using e.g. http://docs.oracle.com/javase/7/docs/api/java/util/zip/Inflater.html

And the java interop adventure beings....

this seems like an approach - https://github.com/amatus/GNUnet-in-Clojure/blob/master/src/main/clojure/org/gnu/clojure/gnunet/zip.clj

Wait what about byte-streams?

ooooh

I feel like I'm so close though

"x?????0\fE??k???]?????A?t\"??K??\b??e2???vG?G???\n\rz??????B/;X/?&??\n??`??\r?Z???????z ??9?m??_?L??;?S??*8.??(?c4!8%????0?1/?}Y?B?i??\\???BY????E??\r?f??)i\fº?Z??$??u??+??2<?\r?B&\"5?1LIz?!*?Iz??,?l?`???/?????Y??t?Rh??R????y??2??+????????NGa???\r??R8?u??\b+c????*\n???k????ab??q?u?G??.\\?4?}??U?f?r???l?r"
 

Oh btw, @dm3 that approach did work, I included it in my project, and used the following line on the incoming packet:

(String. (byte-array (z/inflate msg))) 

Took a lot of mucking around and some help from other people but it works!