[JENKINS-39150] report remoting diagnostics when it's available

Since this plugin cannot assume the version of core, access the method in question via reflection (and also report the failure to find that method, so that we have evidence either way.)
jenkinsci · Oct 21, 2016 · 1f43ffb · 1f43ffb
1 parent b7e93c4
commit 1f43ffb
Showing 1 changed file with 51 additions and 0 deletions.
diff --git a/src/main/java/com/cloudbees/jenkins/support/impl/RemotingDiagnostics.java b/src/main/java/com/cloudbees/jenkins/support/impl/RemotingDiagnostics.java
@@ -0,0 +1,51 @@
+package com.cloudbees.jenkins.support.impl;
+
+import com.cloudbees.jenkins.support.api.Component;
+import com.cloudbees.jenkins.support.api.Container;
+import com.cloudbees.jenkins.support.api.PrintedContent;
+import edu.umd.cs.findbugs.annotations.NonNull;
+import hudson.remoting.Channel;
+import hudson.security.Permission;
+import jenkins.model.Jenkins;
+
+import java.io.IOException;
+import java.io.PrintWriter;
+import java.lang.reflect.Method;
+import java.util.Collections;
+import java.util.Set;
+
+/**
+ * Captures diagnostics information from remoting channels.
+ *
+ * @author Kohsuke Kawaguchi
+ */
+public class RemotingDiagnostics extends Component {
+
+    @NonNull
+    @Override
+    public Set<Permission> getRequiredPermissions() {
+        return Collections.singleton(Jenkins.ADMINISTER);
+    }
+
+    @NonNull
+    @Override
+    public String getDisplayName() {
+        return "Remoting Channel Diagnostics";
+    }
+
+    @Override
+    public void addContents(@NonNull Container container) {
+        container.add(new PrintedContent("channel-diagnostics.md") {
+            @Override
+            protected void printTo(PrintWriter out) throws IOException {
+                // this method is new in remoting. see JENKINS-39150 change in remoting
+                try {
+                    Method m = Channel.class.getMethod("dumpDiagnosticsForAll", PrintWriter.class);
+                    m.invoke(null,out);
+                } catch (Exception e) {
+                    e.printStackTrace(out);
+                }
+            }
+        });
+    }
+}