add websockets work

ktor/client/build.gradle

@@ -45,6 +45,7 @@ kotlin {
                 }
 
                 api "io.ktor:ktor-client-core:$ktor_version"
+                api "io.ktor:ktor-client-websockets:$ktor_version"
             }
         }
         commonTest {
@@ -58,6 +59,8 @@ kotlin {
                 implementation kotlin('stdlib-jdk8')
 
                 api "io.ktor:ktor-client:$ktor_version"
+                api "io.ktor:ktor-client-websockets-jvm:$ktor_version"
+                api "io.ktor:ktor-client-okhttp:$ktor_version"
             }
         }
         jvmTest {
@@ -70,6 +73,7 @@ kotlin {
                 implementation kotlin('stdlib-js')
 
                 api "io.ktor:ktor-client-js:$ktor_version"
+                api "io.ktor:ktor-client-websockets-js:$ktor_version"
             }
         }
         jsTest {

ktor/client/src/commonMain/kotlin/com/insanusmokrassar/postssystem/ktor/client/FlowsWebsockets.kt

@@ -0,0 +1,45 @@
+package com.insanusmokrassar.postssystem.ktor.client
+
+import com.insanusmokrassar.postssystem.ktor.*
+import com.insanusmokrassar.postssystem.utils.common.safely
+import io.ktor.client.HttpClient
+import io.ktor.client.features.websocket.ws
+import io.ktor.client.request.url
+import io.ktor.http.HttpMethod
+import io.ktor.http.cio.websocket.*
+import kotlinx.coroutines.flow.*
+import kotlinx.coroutines.isActive
+
+inline fun <reified T> createStandardWebsocketFlow(
+    client: HttpClient,
+    url: String,
+    crossinline conversation: suspend (ByteArray) -> T
+): Flow<T> {
+    val correctedUrl = url.asCorrectWebSocketUrl
+
+    return channelFlow {
+        val producerScope = this
+        safely(
+            {
+                producerScope.close()
+                throw it
+            }
+        ) {
+            client.ws(
+                correctedUrl
+            ) {
+                while (true) {
+                    when (val received = incoming.receive()) {
+                        is Frame.Binary -> producerScope.send(
+                            conversation(received.readBytes())
+                        )
+                        else -> {
+                            producerScope.close()
+                            return@ws
+                        }
+                    }
+                }
+            }
+        }
+    }
+}