Clean ShellFactoryImpl logging, add a test (fixes #1060)

remote-ssh/pom.xml

@@ -55,6 +55,12 @@
             <artifactId>junit-jupiter-api</artifactId>
             <scope>test</scope>
         </dependency>
+
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-jdk14</artifactId>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 
 </project>

remote-ssh/src/main/java/org/jline/builtins/ssh/ShellFactoryImpl.java

@@ -30,38 +30,23 @@
 import org.jline.terminal.Size;
 import org.jline.terminal.Terminal;
 import org.jline.terminal.TerminalBuilder;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 /**
  * SSHD {@link org.apache.sshd.server.command.Command} factory which provides access to
  * Shell.
  */
 public class ShellFactoryImpl implements ShellFactory {
+
+    private static final Logger LOGGER = LoggerFactory.getLogger(ShellFactoryImpl.class);
+
     private final Consumer<Ssh.ShellParams> shell;
 
     public ShellFactoryImpl(Consumer<Ssh.ShellParams> shell) {
         this.shell = shell;
     }
 
-    private static void flush(OutputStream... streams) {
-        for (OutputStream s : streams) {
-            try {
-                s.flush();
-            } catch (IOException e) {
-                // Ignore
-            }
-        }
-    }
-
-    static void close(Closeable... closeables) {
-        for (Closeable c : closeables) {
-            try {
-                c.close();
-            } catch (IOException e) {
-                // Ignore
-            }
-        }
-    }
-
     public Command createShell(ChannelSession session) {
         return new ShellImpl();
     }
@@ -95,20 +80,13 @@ public void setExitCallback(ExitCallback callback) {
 
         public void start(final ChannelSession session, final Environment env) throws IOException {
             try {
-                new Thread(() -> {
-                            try {
-                                ShellImpl.this.run(session, env);
-                            } catch (Throwable t) {
-                                t.printStackTrace();
-                            }
-                        })
-                        .start();
+                new Thread(() -> ShellImpl.this.run(session, env)).start();
             } catch (Exception e) {
                 throw new IOException("Unable to start shell", e);
             }
         }
 
-        public void run(ChannelSession session, Environment env) throws Exception {
+        public void run(ChannelSession session, Environment env) {
             try {
                 Attributes attributes = new Attributes();
                 for (Map.Entry<PtyMode, Integer> e : env.getPtyModes().entrySet()) {
@@ -222,7 +200,9 @@ public void run(ChannelSession session, Environment env) throws Exception {
 
                 shell.accept(new Ssh.ShellParams(env.getEnv(), session.getSession(), terminal, () -> destroy(session)));
             } catch (Throwable t) {
-                t.printStackTrace();
+                if (!closed) {
+                    LOGGER.error("Error occured while executing shell", t);
+                }
             }
         }
 
@@ -235,4 +215,24 @@ public void destroy(ChannelSession session) {
             }
         }
     }
+
+    static void flush(OutputStream... streams) {
+        for (OutputStream s : streams) {
+            try {
+                s.flush();
+            } catch (IOException e) {
+                LOGGER.debug("Error flushing " + s, e);
+            }
+        }
+    }
+
+    static void close(Closeable... closeables) {
+        for (Closeable c : closeables) {
+            try {
+                c.close();
+            } catch (IOException e) {
+                LOGGER.debug("Error closing " + c, e);
+            }
+        }
+    }
 }

remote-ssh/src/test/java/org/jline/builtins/ssh/SshdTest.java

@@ -0,0 +1,70 @@
+/*
+ * Copyright (c) 2002-2024, the original author(s).
+ *
+ * This software is distributable under the BSD license. See the terms of the
+ * BSD license in the documentation provided with this software.
+ *
+ * https://opensource.org/licenses/BSD-3-Clause
+ */
+package org.jline.builtins.ssh;
+
+import java.nio.file.Paths;
+
+import org.apache.sshd.client.SshClient;
+import org.apache.sshd.client.channel.ChannelShell;
+import org.apache.sshd.client.session.ClientSession;
+import org.apache.sshd.server.SshServer;
+import org.apache.sshd.server.keyprovider.SimpleGeneratorHostKeyProvider;
+import org.jline.reader.EndOfFileException;
+import org.jline.reader.LineReader;
+import org.jline.reader.LineReaderBuilder;
+import org.jline.reader.UserInterruptException;
+import org.junit.jupiter.api.Test;
+
+public class SshdTest {
+
+    @Test
+    void test() throws Exception {
+        SshServer sshd = SshServer.setUpDefaultServer();
+        sshd.setPort(0);
+        sshd.setKeyPairProvider(new SimpleGeneratorHostKeyProvider(Paths.get("target/hostkey.ser")));
+        sshd.setPasswordAuthenticator((username, password, session) -> true);
+        sshd.setShellFactory(new ShellFactoryImpl(shellParams -> {
+            LineReader reader = LineReaderBuilder.builder()
+                    .terminal(shellParams.getTerminal())
+                    .build();
+
+            try {
+                String line;
+                reader.printAbove("Welcome to SSH Server");
+                while ((line = reader.readLine("sshTest > ")) != null) {
+                    System.out.println(line);
+                }
+            } catch (UserInterruptException e) {
+                // Ignore
+            } catch (EndOfFileException e) {
+                // Ignore
+            } catch (Exception e) {
+                // ignore OTHER EXCEPTIONS
+            }
+        }));
+
+        // Start the server
+        sshd.start();
+        System.out.println("SSH Server started on port 2222");
+
+        SshClient client = SshClient.setUpDefaultClient();
+        client.start();
+        ClientSession session =
+                client.connect("test", "localhost", sshd.getPort()).verify().getClientSession();
+        session.addPasswordIdentity("foo");
+        session.auth().verify();
+        ChannelShell shell = session.createShellChannel();
+        shell.open().verify();
+        shell.getInvertedIn().write("echo foo\n".getBytes());
+        shell.close();
+        client.close();
+
+        Thread.sleep(1000);
+    }
+}