Fix a file descriptor leak with wrong user:pass

Set SO_LINGER to 0 in tests that produce many outgoing connections,
because so many sockets in the TIME_WAIT state can lead to
'java.net.NoRouteToHostException: Cannot assign requested address
(Address not available)' exceptions on Travis-CI.

Fixes #132.

Author: Totktonada

src/main/java/org/tarantool/TarantoolBase.java

@@ -40,11 +40,13 @@ public TarantoolBase() {
     public TarantoolBase(String username, String password, Socket socket) {
         super();
         try {
-            this.is = new DataInputStream(cis = new CountInputStreamImpl(socket.getInputStream()));
+            cis = new CountInputStreamImpl(socket.getInputStream());
+            is = new DataInputStream(cis);
             byte[] bytes = new byte[64];
             is.readFully(bytes);
             String firstLine = new String(bytes);
             if (!firstLine.startsWith(WELCOME)) {
+                closeStreams();
                 close();
                 throw new CommunicationException("Welcome message should starts with tarantool but starts with '" + firstLine + "'", new IllegalStateException("Invalid welcome packet"));
             }
@@ -56,23 +58,15 @@ public TarantoolBase(String username, String password, Socket socket) {
                 OutputStream os = socket.getOutputStream();
                 os.write(authPacket.array(), 0, authPacket.remaining());
                 os.flush();
-                readPacket(is);
+                readPacket();
                 Long code = (Long) headers.get(Key.CODE.getId());
                 if (code != 0) {
+                    closeStreams();
                     throw serverError(code, body.get(Key.ERROR.getId()));
                 }
             }
         } catch (IOException e) {
-            try {
-                is.close();
-            } catch (IOException ignored) {
-
-            }
-            try {
-                cis.close();
-            } catch (IOException ignored) {
-
-            }
+            closeStreams();
             throw new CommunicationException("Couldn't connect to tarantool", e);
         }
     }
@@ -130,7 +124,7 @@ protected ByteBuffer createPacket(Code code, Long syncId, Long schemaId, Object.
         return buffer;
     }
 
-    protected void readPacket(DataInputStream is) throws IOException {
+    protected void readPacket() throws IOException {
         int size = ((Number) msgPackLite.unpack(is)).intValue();
         long mark = cis.getBytesRead();
         headers = (Map<Integer, Object>) msgPackLite.unpack(is);
@@ -185,7 +179,6 @@ protected List<Map<String, Object>> readSqlResult(List<List<?>> data) {
         return values;
     }
 
-
     protected Long getSqlRowCount() {
         Map<Key, Object> info = (Map<Key, Object>) body.get(Key.SQL_INFO.getId());
         Number rowCount;
@@ -220,6 +213,21 @@ protected void closeChannel(SocketChannel channel) {
         }
     }
 
+    protected void closeStreams() {
+        if (is != null) {
+            try {
+                is.close();
+            } catch (IOException ignored) {
+            }
+        }
+        if (cis != null) {
+            try {
+                cis.close();
+            } catch (IOException ignored) {
+            }
+        }
+    }
+
     protected void validateArgs(Object[] args) {
         if (args != null) {
             for (int i = 0; i < args.length; i += 2) {

src/main/java/org/tarantool/TarantoolClientImpl.java

@@ -132,40 +132,34 @@ protected void reconnect(int retry, Throwable lastError) {
     }
 
     protected void connect(final SocketChannel channel) throws Exception {
+        closeStreams();
         try {
-            DataInputStream is = new DataInputStream(cis = new ByteBufferInputStream(channel));
+            cis = new ByteBufferInputStream(channel);
+            is = new DataInputStream(cis);
             byte[] bytes = new byte[64];
             is.readFully(bytes);
             String firstLine = new String(bytes);
             if (!firstLine.startsWith("Tarantool")) {
                 CommunicationException e = new CommunicationException("Welcome message should starts with tarantool " +
                         "but starts with '" + firstLine + "'", new IllegalStateException("Invalid welcome packet"));
 
+                closeStreams();
                 close(e);
                 throw e;
             }
             is.readFully(bytes);
             this.salt = new String(bytes);
             if (config.username != null && config.password != null) {
                 writeFully(channel, createAuthPacket(config.username, config.password));
-                readPacket(is);
+                readPacket();
                 Long code = (Long) headers.get(Key.CODE.getId());
                 if (code != 0) {
+                    closeStreams();
                     throw serverError(code, body.get(Key.ERROR.getId()));
                 }
             }
-            this.is = is;
         } catch (IOException e) {
-            try {
-                is.close();
-            } catch (IOException ignored) {
-
-            }
-            try {
-                cis.close();
-            } catch (IOException ignored) {
-
-            }
+            closeStreams();
             throw new CommunicationException("Couldn't connect to tarantool", e);
         }
         channel.configureBlocking(false);
@@ -358,7 +352,7 @@ protected void readThread() {
             while (!Thread.currentThread().isInterrupted()) {
                 try {
                     long code;
-                    readPacket(is);
+                    readPacket();
                     code = (Long) headers.get(Key.CODE.getId());
                     Long syncId = (Long) headers.get(Key.SYNC.getId());
                     CompletableFuture<?> future = futures.remove(syncId);

src/main/java/org/tarantool/TarantoolConnection.java

@@ -28,7 +28,7 @@ protected List<?> exec(Code code, Object... args) {
             ByteBuffer packet = createPacket(code, syncId.incrementAndGet(), null, args);
             out.write(packet.array(), 0, packet.remaining());
             out.flush();
-            readPacket(is);
+            readPacket();
             Long c = (Long) headers.get(Key.CODE.getId());
             if (c == 0) {
                 return (List) body.get(Key.DATA.getId());

src/test/java/org/tarantool/AbstractTarantoolConnectorIT.java

@@ -135,6 +135,10 @@ protected TarantoolClient makeClient() {
         return new TarantoolClientImpl(socketChannelProvider, makeClientConfig());
     }
 
+    protected TarantoolClient makeClient(SocketChannelProvider provider) {
+        return new TarantoolClientImpl(provider, makeClientConfig());
+    }
+
     protected static TarantoolClientConfig makeClientConfig() {
         return fillClientConfig(new TarantoolClientConfig());
     }

src/test/java/org/tarantool/ClientReconnectIT.java

@@ -20,6 +20,7 @@
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNull;
 import static org.junit.jupiter.api.Assertions.assertNotNull;
 import static org.junit.jupiter.api.Assertions.assertThrows;
 import static org.junit.jupiter.api.Assertions.assertTrue;
@@ -215,19 +216,27 @@ public void run() {
 
     /**
      * Test concurrent operations, reconnects and close.
+     *
      * Expected situation is nothing gets stuck.
+     *
+     * The test sets SO_LINGER to 0 for outgoing connections to avoid producing
+     * many TIME_WAIT sockets, because an available port range can be
+     * exhausted.
      */
     @Test
     public void testLongParallelCloseReconnects() {
         int numThreads = 4;
         int numClients = 4;
         int timeBudget = 30*1000;
 
+        SocketChannelProvider provider = new TestSocketChannelProvider(host,
+            port, RESTART_TIMEOUT).setSoLinger(0);
+
         final AtomicReferenceArray<TarantoolClient> clients =
             new AtomicReferenceArray<TarantoolClient>(numClients);
 
         for (int idx = 0; idx < clients.length(); idx++) {
-            clients.set(idx, makeClient());
+            clients.set(idx, makeClient(provider));
         }
 
         final Random rnd = new Random();
@@ -256,7 +265,7 @@ public void run() {
 
                             cli.close();
 
-                            TarantoolClient next = makeClient();
+                            TarantoolClient next = makeClient(provider);
                             if (!clients.compareAndSet(idx, cli, next)) {
                                 next.close();
                             }
@@ -284,7 +293,9 @@ public void run() {
                 fail(e);
             }
             if (deadline > System.currentTimeMillis()) {
-                System.out.println("" + (deadline - System.currentTimeMillis())/1000 + "s remains.");
+                System.out.println("testLongParallelCloseReconnects: " +
+                    (deadline - System.currentTimeMillis()) / 1000 +
+                    "s remain");
             }
         }
 
@@ -302,4 +313,46 @@ public void run() {
 
         assertTrue(cnt.get() > threads.length);
     }
+
+    /**
+     * Verify that we don't exceed a file descriptor limit (and so likely don't
+     * leak file descriptors) when trying to connect to an existing node with
+     * wrong authentification credentials.
+     *
+     * The test sets SO_LINGER to 0 for outgoing connections to avoid producing
+     * many TIME_WAIT sockets, because an available port range can be
+     * exhausted.
+     */
+    @Test
+    public void testReconnectWrongAuth() throws Exception {
+        SocketChannelProvider provider = new TestSocketChannelProvider(host,
+            port, RESTART_TIMEOUT).setSoLinger(0);
+        TarantoolClientConfig config = makeClientConfig();
+        config.initTimeoutMillis = 100;
+        config.password = config.password + 'x';
+        for (int i = 0; i < 100; ++i) {
+            if (i % 10 == 0)
+                System.out.println("testReconnectWrongAuth: " + (100 - i) +
+                    " iterations remain");
+            CommunicationException e = assertThrows(CommunicationException.class,
+                new Executable() {
+                    @Override
+                    public void execute() throws Throwable {
+                        client = new TarantoolClientImpl(provider, config);
+                    }
+                }
+            );
+            assertEquals(e.getMessage(), "100ms is exceeded when waiting " +
+                "for client initialization. You could configure init " +
+                "timeout in TarantoolConfig");
+        }
+
+        /*
+         * Verify we don't exceed a file descriptor limit. If we exceed it, a
+         * client will not able to connect to tarantool.
+         */
+        TarantoolClient client = makeClient();
+        client.syncOps().ping();
+        client.close();
+    }
 }

src/test/java/org/tarantool/TestSocketChannelProvider.java

@@ -2,27 +2,42 @@
 
 import java.net.InetSocketAddress;
 import java.nio.channels.SocketChannel;
+import static java.net.StandardSocketOptions.SO_LINGER;
 
 /**
  * Socket channel provider to be used throughout the tests.
  */
 public class TestSocketChannelProvider implements SocketChannelProvider {
     String host;
     int port;
-    int restart_timeout;
+    int restartTimeout;
+    int soLinger;
 
-    public TestSocketChannelProvider(String host, int port, int restart_timeout) {
+    public TestSocketChannelProvider(String host, int port, int restartTimeout) {
         this.host = host;
         this.port = port;
-        this.restart_timeout = restart_timeout;
+        this.restartTimeout = restartTimeout;
+        this.soLinger = -1;
+    }
+
+    public TestSocketChannelProvider setSoLinger(int soLinger) {
+        this.soLinger = soLinger;
+        return this;
     }
 
     @Override
     public SocketChannel get(int retryNumber, Throwable lastError) {
-        long budget = System.currentTimeMillis() + restart_timeout;
+        long budget = System.currentTimeMillis() + restartTimeout;
         while (!Thread.currentThread().isInterrupted()) {
             try {
-                return SocketChannel.open(new InetSocketAddress(host, port));
+                SocketChannel channel = SocketChannel.open();
+                /*
+                 * A value less then zero means disable lingering (it is a
+                 * default behaviour).
+                 */
+                channel.setOption(SO_LINGER, soLinger);
+                channel.connect(new InetSocketAddress(host, port));
+                return channel;
             } catch (Exception e) {
                 if (budget < System.currentTimeMillis())
                     throw new RuntimeException(e);