Detect build scans in pipeline logs

by using a separate step.

build.gradle

@@ -56,18 +56,20 @@ jenkinsPlugin {
   disabledTestInjection = false
 }
 
-sourceCompatibility = '1.7'
+sourceCompatibility = '1.8'
 
 dependencies {
   compile 'org.jenkins-ci.lib:dry-run-lib:0.1'
-  jenkinsPlugins 'org.jenkins-ci.plugins:structs:1.3'
+  jenkinsPlugins 'org.jenkins-ci.plugins:structs:1.5'
+  jenkinsPlugins 'org.jenkins-ci.plugins.workflow:workflow-api:2.20'
 
-  signature 'org.codehaus.mojo.signature:java17:1.0@signature'
+  signature 'org.codehaus.mojo.signature:java18:1.0@signature'
 
   testFixturesImplementation 'org.jenkins-ci.main:jenkins-test-harness:2.44'
 
   jenkinsTest 'org.jenkins-ci.main:jenkins-test-harness:2.44'
   jenkinsTest 'org.jenkins-ci.main:jenkins-test-harness-tools:2.2'
+  jenkinsPlugins 'org.jenkins-ci.plugins.workflow:workflow-aggregator:2.5'
 
   testImplementation 'org.spockframework:spock-core:0.7-groovy-1.8'
 

src/main/java/hudson/plugins/gradle/BuildScanAction.java

@@ -32,7 +32,9 @@ public String getUrlName() {
     }
 
     public void addScanUrl(String scanUrl) {
-        scanUrls.add(scanUrl);
+        if (!scanUrls.contains(scanUrl)) {
+            scanUrls.add(scanUrl);
+        }
     }
 
     @Exported

src/main/java/hudson/plugins/gradle/BuildScanLogScanner.java

@@ -0,0 +1,33 @@
+package hudson.plugins.gradle;
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public class BuildScanLogScanner {
+    private final BuildScanPublishedListener listener;
+    private int linesSinceBuildScanPublishingMessage = Integer.MAX_VALUE;
+    private static final Pattern BUILD_SCAN_PATTERN = Pattern.compile("Publishing (build scan|build information)\\.\\.\\.");
+    private static final Pattern URL_PATTERN = Pattern.compile("https?://\\S*");
+
+    public static final int MAX_PUBLISHED_MESSAGE_LENGTH = 70;
+
+    public BuildScanLogScanner(BuildScanPublishedListener listener) {
+        this.listener = listener;
+    }
+
+    void scanLine(String line) {
+        if (linesSinceBuildScanPublishingMessage < 10) {
+            linesSinceBuildScanPublishingMessage++;
+            Matcher matcher = URL_PATTERN.matcher(line);
+            if (matcher.find()) {
+                linesSinceBuildScanPublishingMessage = Integer.MAX_VALUE;
+                String buildScanUrl = matcher.group();
+                listener.onBuildScanPublished(buildScanUrl);
+            }
+        }
+        if (line.length() < MAX_PUBLISHED_MESSAGE_LENGTH && BUILD_SCAN_PATTERN.matcher(line).find()) {
+            linesSinceBuildScanPublishingMessage = 0;
+        }
+
+    }
+}

src/main/java/hudson/plugins/gradle/BuildScanPublisher.java

@@ -0,0 +1,63 @@
+package hudson.plugins.gradle;
+
+import com.google.common.collect.ImmutableSet;
+import hudson.Extension;
+import hudson.model.Run;
+import org.jenkinsci.plugins.workflow.steps.Step;
+import org.jenkinsci.plugins.workflow.steps.StepContext;
+import org.jenkinsci.plugins.workflow.steps.StepDescriptor;
+import org.jenkinsci.plugins.workflow.steps.StepExecution;
+import org.jenkinsci.plugins.workflow.steps.SynchronousNonBlockingStepExecution;
+import org.kohsuke.stapler.DataBoundConstructor;
+
+import javax.annotation.Nonnull;
+import java.io.BufferedReader;
+import java.util.Set;
+
+public class BuildScanPublisher extends Step {
+    @DataBoundConstructor
+    public BuildScanPublisher() {
+    }
+
+    @Override
+    public StepExecution start(StepContext context) {
+        return new Execution(context);
+    }
+
+    static class Execution extends SynchronousNonBlockingStepExecution<Void> {
+        private static final long serialVersionUID = 1L;
+
+        protected Execution(@Nonnull StepContext context) {
+            super(context);
+        }
+
+        @Override
+        protected Void run() throws Exception {
+            Run run = getContext().get(Run.class);
+            BufferedReader logReader = new BufferedReader(run.getLogReader());
+            BuildScanLogScanner scanner = new BuildScanLogScanner(new DefaultBuildScanPublishedListener(run));
+            logReader.lines().forEach(scanner::scanLine);
+            return null;
+        }
+    }
+
+    @Extension
+    public static final class DescriptorImpl extends StepDescriptor {
+
+        @Override
+        public Set<? extends Class<?>> getRequiredContext() {
+            return ImmutableSet.of(Run.class);
+        }
+
+        @Nonnull
+        @Override
+        public String getDisplayName() {
+            return "Find published build scans";
+        }
+
+        @Override
+        public String getFunctionName() {
+            return "findBuildScans";
+        }
+    }
+}

src/main/java/hudson/plugins/gradle/GradleConsoleAnnotator.java

@@ -6,33 +6,25 @@
 import java.io.OutputStream;
 import java.nio.ByteBuffer;
 import java.nio.charset.Charset;
-import java.util.regex.Matcher;
-import java.util.regex.Pattern;
 
 /**
  * @author ikikko
  * @see <a href="https://github.com/jenkinsci/ant-plugin/blob/master/src/main/java/hudson/tasks/_ant/AntConsoleAnnotator.java">AntConsoleAnnotator</a>
  */
 public class GradleConsoleAnnotator extends LineTransformationOutputStream {
 
-    private static final Pattern BUILD_SCAN_PATTERN = Pattern.compile("Publishing (build scan|build information)\\.\\.\\.");
-    private static final Pattern URL_PATTERN = Pattern.compile("https?://\\S*");
-    private static final int MAX_PUBLISHED_MESSAGE_LENGTH = 70;
-
     private final OutputStream out;
     private final Charset charset;
     private final boolean annotateGradleOutput;
-    private final BuildScanPublishedListener buildScanListener;
     private final int maxLineLength;
-
-    private int linesSinceBuildScanPublishingMessage = Integer.MAX_VALUE;
+    private final BuildScanLogScanner buildScanLogScanner;
 
     public GradleConsoleAnnotator(OutputStream out, Charset charset, boolean annotateGradleOutput, BuildScanPublishedListener buildScanListener) {
         this.out = out;
         this.charset = charset;
         this.annotateGradleOutput = annotateGradleOutput;
-        this.buildScanListener = buildScanListener;
-        this.maxLineLength = annotateGradleOutput ? 500 : MAX_PUBLISHED_MESSAGE_LENGTH;
+        this.maxLineLength = annotateGradleOutput ? 500 : BuildScanLogScanner.MAX_PUBLISHED_MESSAGE_LENGTH;
+        this.buildScanLogScanner = new BuildScanLogScanner(buildScanListener);
     }
 
     @Override
@@ -55,18 +47,7 @@ protected void eol(byte[] b, int len) throws IOException {
                 }
             }
 
-            if (linesSinceBuildScanPublishingMessage < 10) {
-                linesSinceBuildScanPublishingMessage++;
-                Matcher matcher = URL_PATTERN.matcher(line);
-                if (matcher.find()) {
-                    linesSinceBuildScanPublishingMessage = Integer.MAX_VALUE;
-                    String buildScanUrl = matcher.group();
-                    buildScanListener.onBuildScanPublished(buildScanUrl);
-                }
-            }
-            if (len < MAX_PUBLISHED_MESSAGE_LENGTH && BUILD_SCAN_PATTERN.matcher(line).find()) {
-                linesSinceBuildScanPublishingMessage = 0;
-            }
+            buildScanLogScanner.scanLine(line);
         }
 
         out.write(b, 0, len);

src/main/resources/hudson/plugins/gradle/BuildScanPublisher/help.html

@@ -0,0 +1,4 @@
+<div>
+    Inspect build log for published Gradle build scans.
+    The build scans will be shown on the pipeline build page.
+</div>