Stream live data to the viewer using WebSockets (#294)

1 files changed, 146 insertions, 0 deletions

diff --git a/spark-common/src/main/java11/me/lucko/spark/common/util/ws/BytesocksClientImpl.java b/spark-common/src/main/java11/me/lucko/spark/common/util/ws/BytesocksClientImpl.java
new file mode 100644
index 0000000..7adb809
--- /dev/null
+++ b/spark-common/src/main/java11/me/lucko/spark/common/util/ws/BytesocksClientImpl.java
@@ -0,0 +1,146 @@
+/*
+ * This file is part of spark.
+ *
+ *  Copyright (c) lucko (Luck) <luck@lucko.me>
+ *  Copyright (c) contributors
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package me.lucko.spark.common.util.ws;
+
+import java.net.URI;
+import java.net.http.HttpClient;
+import java.net.http.HttpRequest;
+import java.net.http.HttpResponse;
+import java.net.http.WebSocket;
+import java.time.Duration;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.CompletionStage;
+
+/**
+ * Java 11 implementation of {@link BytesocksClient}.
+ */
+class BytesocksClientImpl implements BytesocksClient {
+
+    private final HttpClient client;
+
+    /* The bytesocks urls */
+    private final String httpUrl;
+    private final String wsUrl;
+
+    /** The client user agent */
+    private final String userAgent;
+
+    BytesocksClientImpl(String host, String userAgent) {
+        this.client = HttpClient.newHttpClient();
+
+        this.httpUrl = "https://" + host + "/";
+        this.wsUrl = "wss://" + host + "/";
+        this.userAgent = userAgent;
+    }
+
+    @Override
+    public Socket createAndConnect(Listener listener) throws Exception {
+        HttpRequest createRequest = HttpRequest.newBuilder()
+                .uri(URI.create(this.httpUrl + "create"))
+                .header("User-Agent", this.userAgent)
+                .build();
+
+        HttpResponse<Void> resp = this.client.send(createRequest, HttpResponse.BodyHandlers.discarding());
+        if (resp.statusCode() != 201) {
+            throw new RuntimeException("Request failed: " + resp);
+        }
+
+        String channelId = resp.headers().firstValue("Location").orElse(null);
+        if (channelId == null) {
+            throw new RuntimeException("Location header not returned: " + resp);
+        }
+
+        return connect(channelId, listener);
+    }
+
+    @Override
+    public Socket connect(String channelId, Listener listener) throws Exception {
+        WebSocket socket = this.client.newWebSocketBuilder()
+                .header("User-Agent", this.userAgent)
+                .connectTimeout(Duration.ofSeconds(5))
+                .buildAsync(URI.create(this.wsUrl + channelId), new ListenerImpl(listener))
+                .join();
+
+        return new SocketImpl(channelId, socket);
+    }
+
+    private static final class SocketImpl implements Socket {
+        private final String id;
+        private final WebSocket ws;
+
+        private SocketImpl(String id, WebSocket ws) {
+            this.id = id;
+            this.ws = ws;
+        }
+
+        @Override
+        public String getChannelId() {
+            return this.id;
+        }
+
+        @Override
+        public boolean isOpen() {
+            return !this.ws.isOutputClosed() && !this.ws.isInputClosed();
+        }
+
+        @Override
+        public CompletableFuture<?> send(CharSequence msg) {
+            return this.ws.sendText(msg, true);
+        }
+
+        @Override
+        public void close(int statusCode, String reason) {
+            this.ws.sendClose(statusCode, reason);
+        }
+    }
+
+    private static final class ListenerImpl implements WebSocket.Listener {
+        private final Listener listener;
+
+        private ListenerImpl(Listener listener) {
+            this.listener = listener;
+        }
+
+        @Override
+        public void onOpen(WebSocket webSocket) {
+            this.listener.onOpen();
+            webSocket.request(1);
+        }
+
+        @Override
+        public CompletionStage<?> onClose(WebSocket webSocket, int statusCode, String reason) {
+            return CompletableFuture.runAsync(() -> this.listener.onClose(statusCode, reason));
+        }
+
+        @Override
+        public void onError(WebSocket webSocket, Throwable error) {
+            this.listener.onError(error);
+        }
+
+        @Override
+        public CompletionStage<?> onText(WebSocket webSocket, CharSequence data, boolean last) {
+            webSocket.request(1);
+            return CompletableFuture.runAsync(() -> this.listener.onText(data));
+        }
+    }
+
+
+}