Ember Web Socket Client

[danghieutrung]

Complete PR of ember-wsclient implementation.

Snapshot

Published as 0.23.23-101-eb5dd80-SNAPSHOT. Supports JVM, Node.js, Native — please give it a try!

libraryDependencies += "org.http4s" %% "http4s-ember-client" % "0.23.23-101-eb5dd80-SNAPSHOT"
resolvers += "s01-oss-sonatype-org-snapshots" at "https://s01.oss.sonatype.org/content/repositories/snapshots"

https://github.com/http4s/http4s/actions/runs/6000578477/attempts/1#summary-16274325476

Demo

//> using repository https://s01.oss.sonatype.org/content/repositories/snapshots/
//> using dep org.http4s::http4s-ember-client::0.23.23-101-eb5dd80-SNAPSHOT

import cats.effect.*
import org.http4s.ember.client.EmberClientBuilder
import org.http4s.client.websocket.*
import org.http4s.syntax.all.*

object App extends IOApp.Simple:
  def run = EmberClientBuilder .default[IO].buildWebSocket.use { (client, wsClient) =>
    wsClient
      .connectHighLevel(WSRequest(uri"wss://ws.postman-echo.com/raw"))
      .use { conn =>
        conn.send(WSFrame.Text("hello from ember websockets")) *>
          conn.receive.flatMap(IO.println(_))
      }
    }

[armanbilge]

Nice!! We can now move this suite from jvm-only to shared :)

[armanbilge]

If the Ember client is created withHttp2 enabled, then it causes the java.lang.RuntimeException: Not an Ember client error. This is because the connection upgrades to HTTP/2 but we don't support upgrading to WebSockets over HTTP/2.

To fix this we need some way to force Ember to always use HTTP/1 when negotiating a WebSocket upgrade 🤔

[armanbilge]

Update: I think we're almost ready to merge this, but there is still at least one bug that needs to be investigated. The kubernetes-client is attempting to adopt the Ember WS client but it's not 100% working yet.

• WIP: Support Scala Native joan38/kubernetes-client#239

Help would be very appreciated!!