Log computer name on platform detail collection failure

Also adds tests to cover the platform detail collection failure message.

src/main/java/org/jvnet/hudson/plugins/platformlabeler/NodeLabelCache.java

@@ -65,20 +65,24 @@ public class NodeLabelCache extends ComputerListener {
      * @param computer agent whose labels will be cached
      * @param channel This is the channel object to talk to the agent
      * @param root The directory where this agent stores files. The same as Node.getRootPath(), except that method returns null until the agent is connected. So this parameter is passed explicitly instead.
-     * @param ignored TaskListener that is ignored
+     * @param listener logging destination for agent that is connecting
      * @throws java.io.IOException on IO error
      * @throws java.lang.InterruptedException on thread interrupt
      */
     @Override
-    public final void preOnline(final Computer computer, Channel channel, FilePath root, final TaskListener ignored)
+    public final void preOnline(final Computer computer, Channel channel, FilePath root, final TaskListener listener)
             throws IOException, InterruptedException {
         try {
             cacheAndRefreshModel(computer, channel);
         } catch (Exception e) {
-            LOGGER.log(
-                    Level.WARNING,
-                    "Unable to collect platform details during preOnline phase. Connecting the agent anyway.",
-                    e);
+            String name = "unnamed agent"; // built-in (and others) may not have a name during preOnline
+            if (computer != null && !computer.getName().isEmpty()) {
+                name = computer.getName();
+            }
+
+            listener.getLogger()
+                    .println("Ignored platform detail collection failure for '" + name + "' during preOnline phase. "
+                            + e);
         }
     }
 

src/test/java/org/jvnet/hudson/plugins/platformlabeler/NodeLabelCacheTest.java

@@ -7,6 +7,7 @@
 import static org.hamcrest.Matchers.in;
 import static org.hamcrest.Matchers.is;
 import static org.hamcrest.Matchers.not;
+import static org.hamcrest.Matchers.startsWith;
 
 import hudson.FilePath;
 import hudson.Launcher;
@@ -23,13 +24,18 @@
 import hudson.slaves.RetentionStrategy;
 import hudson.util.ClockDifference;
 import hudson.util.DescribableList;
+import hudson.util.LogTaskListener;
+import hudson.util.RingBufferLogHandler;
+import java.io.File;
 import java.io.IOException;
 import java.nio.charset.Charset;
 import java.util.Collection;
 import java.util.List;
 import java.util.Set;
 import java.util.concurrent.Future;
+import java.util.logging.Level;
 import java.util.logging.LogRecord;
+import java.util.logging.Logger;
 import javax.servlet.ServletException;
 import org.junit.After;
 import org.junit.Before;
@@ -152,7 +158,7 @@ public void testGetLabelsForNode_IsNull() throws Exception {
 
     @Test(expected = IOException.class)
     public void testRequestComputerPlatformDetails_ChannelThrows() throws Exception {
-        Computer throwingComputer = new NullingComputer(computer.getNode(), new IOException());
+        Computer throwingComputer = new NullingComputer(computer.getNode(), new IOException("Oops"));
         nodeLabelCache.requestComputerPlatformDetails(throwingComputer, throwingComputer.getChannel());
     }
 
@@ -166,6 +172,111 @@ public void testRequestComputerPlatformDetails_ChannelThrowsOnNullChannel() thro
         nodeLabelCache.requestComputerPlatformDetails(computer, null);
     }
 
+    @Test
+    public void testPreOnline_ChannelLogsDetailCollectionIgnoredOnInternalException() throws Exception {
+        // Setup a recorder for agent log
+        RingBufferLogHandler agentLogHandler = new RingBufferLogHandler(10);
+        Logger agentLogger = Logger.getLogger(NodeLabelCacheTest.class.getName());
+        agentLogger.addHandler(agentLogHandler);
+        TaskListener agentListener = new LogTaskListener(agentLogger, Level.INFO);
+
+        nodeLabelCache.preOnline(computer, null, new FilePath(new File(".")), agentListener);
+
+        assertThat(
+                agentLogHandler.getView().get(0).getMessage(),
+                startsWith("Ignored platform detail collection failure for 'unnamed agent' during preOnline phase."));
+    }
+
+    @Test
+    public void testPreOnline_ChannelLogsDetailCollectionIgnoredOnInternalExceptionForNullComputer() throws Exception {
+        // Setup a recorder for agent log
+        RingBufferLogHandler agentLogHandler = new RingBufferLogHandler(10);
+        Logger agentLogger = Logger.getLogger(NodeLabelCacheTest.class.getName());
+        agentLogger.addHandler(agentLogHandler);
+        TaskListener agentListener = new LogTaskListener(agentLogger, Level.INFO);
+
+        nodeLabelCache.preOnline(null, null, new FilePath(new File(".")), agentListener);
+
+        assertThat(
+                agentLogHandler.getView().get(0).getMessage(),
+                startsWith("Ignored platform detail collection failure for 'unnamed agent' during preOnline phase."));
+    }
+
+    @Test
+    public void testPreOnline_ChannelLogsDetailCollectionIgnoredOnInternalExceptionForComputer() throws Exception {
+        // Setup a recorder for agent log
+        RingBufferLogHandler agentLogHandler = new RingBufferLogHandler(10);
+        Logger agentLogger = Logger.getLogger(NodeLabelCacheTest.class.getName());
+        agentLogger.addHandler(agentLogHandler);
+        TaskListener agentListener = new LogTaskListener(agentLogger, Level.INFO);
+
+        Computer minimal = new MinimalComputer(computer.getNode());
+        String name = minimal.getName();
+        nodeLabelCache.preOnline(minimal, null, new FilePath(new File(".")), agentListener);
+
+        assertThat(
+                agentLogHandler.getView().get(0).getMessage(),
+                startsWith("Ignored platform detail collection failure for '" + name + "' during preOnline phase."));
+    }
+
+    /** A minimal Computer class for preOnline test. */
+    private class MinimalComputer extends Computer {
+        public MinimalComputer(Node node) {
+            super(node);
+        }
+
+        @Override
+        public Node getNode() {
+            return super.getNode();
+        }
+
+        @Override
+        public String getName() {
+            return "computer-test";
+        }
+
+        @Override
+        public VirtualChannel getChannel() {
+            return null;
+        }
+
+        @Override
+        public Charset getDefaultCharset() {
+            throw new UnsupportedOperationException("Unsupported");
+        }
+
+        @Override
+        public List<LogRecord> getLogRecords() throws IOException, InterruptedException {
+            throw new UnsupportedOperationException("Unsupported");
+        }
+
+        @Override
+        @RequirePOST
+        public void doLaunchSlaveAgent(StaplerRequest sr, StaplerResponse sr1) throws IOException, ServletException {
+            throw new UnsupportedOperationException("Unsupported");
+        }
+
+        @Override
+        protected Future<?> _connect(boolean bln) {
+            throw new UnsupportedOperationException("Unsupported");
+        }
+
+        @Override
+        public Boolean isUnix() {
+            throw new UnsupportedOperationException("Unsupported");
+        }
+
+        @Override
+        public boolean isConnecting() {
+            throw new UnsupportedOperationException("Unsupported");
+        }
+
+        @Override
+        public RetentionStrategy<?> getRetentionStrategy() {
+            throw new UnsupportedOperationException("Unsupported");
+        }
+    }
+
     /** Class that intentionally returns nulls for test purposes. */
     private class NullingComputer extends Computer {