feat: expose socket connected state

buildSrc/src/main/kotlin/Constants.kt

@@ -1,7 +1,7 @@
 object Consts {
   const val releaseGroup = "com.piasy"
   const val releaseName = "kmp-socketio"
-  const val releaseVersion = "1.4.3"
+  const val releaseVersion = "1.4.4"
 
   val androidNS = "$releaseGroup.${releaseName.replace('-', '.')}"
 }

kmp-socketio/src/commonMain/kotlin/com/piasy/kmp/socketio/socketio/Socket.kt

@@ -17,7 +17,11 @@ class Socket(
     private val auth: Map<String, String>,
     private val scope: CoroutineScope,
 ) : Emitter() {
-    private var connected = false
+    /**
+     * Whether this socket namespace is currently connected.
+     */
+    var connected = false
+        private set
     private val subs = ArrayList<On.Handle>()
     private val ack = HashMap<Int, Ack>()
     private var ackId = 0

kmp-socketio/src/commonTest/kotlin/com/piasy/kmp/socketio/socketio/ConnectionTest.kt

@@ -76,6 +76,31 @@ abstract class ConnectionTest {
         assertEquals(now.toString(), args[3])
     }
 
+    @Test
+    fun shouldExposeConnectionState() = doTest {
+        val isConnectedBeforeOpen = CompletableDeferred<Boolean>()
+        val isConnectedWhenConnectedEvent = CompletableDeferred<Boolean>()
+        val isConnectedWhenDisconnectedEvent = CompletableDeferred<Boolean>()
+
+        val opt = IO.Options()
+        opt.transports = listOf(WebSocket.NAME)
+        client(opt = opt) { socket ->
+            isConnectedBeforeOpen.complete(socket.connected)
+            socket.on(Socket.EVENT_CONNECT) {
+                isConnectedWhenConnectedEvent.complete(socket.connected)
+                socket.close()
+            }.on(Socket.EVENT_DISCONNECT) {
+                isConnectedWhenDisconnectedEvent.complete(socket.connected)
+            }
+
+            socket.open()
+        }
+
+        assertFalse(isConnectedBeforeOpen.await())
+        assertTrue(isConnectedWhenConnectedEvent.await())
+        assertFalse(isConnectedWhenDisconnectedEvent.await())
+    }
+
     @Test
     open fun shouldConnectUntrusted() = doTest {
         val trustAllCertsHttpClientFactory = DefaultHttpClientFactory(

kmp-socketio/src/jvmTest/kotlin/com/piasy/kmp/socketio/socketio/ConnectionTestJvm.kt

@@ -0,0 +1,99 @@
+package com.piasy.kmp.socketio.socketio
+
+import com.piasy.kmp.socketio.engineio.transports.WebSocket
+import com.piasy.kmp.xlog.Logging
+import java.io.BufferedReader
+import java.io.InputStreamReader
+import java.util.concurrent.CountDownLatch
+import java.util.concurrent.TimeUnit
+import kotlin.test.assertFalse
+import kotlin.test.assertTrue
+import kotlin.concurrent.thread
+import kotlin.test.Test
+import kotlin.test.AfterTest
+import kotlin.test.BeforeTest
+import kotlinx.coroutines.CompletableDeferred
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.test.runTest
+import kotlinx.coroutines.withContext
+import kotlin.time.Duration.Companion.seconds
+
+class ConnectionTestJvm {
+    private var server: Process? = null
+    private var serverOutputThread: Thread? = null
+    private val serverReady = CountDownLatch(1)
+
+    @BeforeTest
+    fun startServer() {
+        Logging.info(TAG, "startServer")
+        val process = ProcessBuilder("node", "src/jvmTest/resources/socket-server.js", "/")
+            .redirectErrorStream(true)
+            .start()
+        server = process
+        serverOutputThread = thread(start = true, isDaemon = true, name = "socket-server-jvm-test-stdout") {
+            BufferedReader(InputStreamReader(process.inputStream)).use { reader ->
+                while (true) {
+                    val line = reader.readLine() ?: break
+                    Logging.info(TAG, "SERVER OUT: $line")
+                    if (line.contains("Socket.IO server listening on port 3000")) {
+                        serverReady.countDown()
+                    }
+                }
+            }
+        }
+        check(serverReady.await(3, TimeUnit.SECONDS)) { "Socket.IO test server did not start in 3s" }
+        Logging.info(TAG, "startServer finish")
+    }
+
+    @AfterTest
+    fun stopServer() {
+        Logging.info(TAG, "stopServer")
+        serverReady.countDown()
+        server?.let { process ->
+            process.destroy()
+            if (!process.waitFor(3, TimeUnit.SECONDS)) {
+                process.destroyForcibly()
+                process.waitFor(3, TimeUnit.SECONDS)
+            }
+        }
+        server = null
+
+        serverOutputThread?.join(1000)
+        serverOutputThread = null
+        Logging.info(TAG, "stopServer finish")
+    }
+
+    @Test
+    fun shouldExposeConnectionState() = runTest(timeout = 10.seconds) {
+        withContext(Dispatchers.Default) {
+            delay(1000)
+        }
+
+        val isConnectedBeforeOpen = CompletableDeferred<Boolean>()
+        val isConnectedWhenConnectedEvent = CompletableDeferred<Boolean>()
+        val isConnectedWhenDisconnectedEvent = CompletableDeferred<Boolean>()
+
+        val opt = IO.Options()
+        opt.transports = listOf(WebSocket.NAME)
+        IO.socket("http://localhost:3000/", opt) { socket ->
+            isConnectedBeforeOpen.complete(socket.connected)
+            socket.on(Socket.EVENT_CONNECT) {
+                isConnectedWhenConnectedEvent.complete(socket.connected)
+                socket.close()
+            }.on(Socket.EVENT_DISCONNECT) {
+                isConnectedWhenDisconnectedEvent.complete(socket.connected)
+            }
+
+            socket.open()
+        }
+
+        assertFalse(isConnectedBeforeOpen.await())
+        assertTrue(isConnectedWhenConnectedEvent.await())
+        assertFalse(isConnectedWhenDisconnectedEvent.await())
+    }
+
+    companion object {
+        private const val TAG = "ConnectionTestJvm"
+    }
+}