Add Lineage metrics to PubsubIO (apache#32037)

* Add Lineage metrics to PubsubIO

* fix format and add test

* make getDatacatalogname fail safe

sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/pubsub/PubsubClient.java

@@ -39,12 +39,15 @@
 import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.base.Splitter;
 import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.ImmutableMap;
 import org.checkerframework.checker.nullness.qual.Nullable;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 /** An (abstract) helper class for talking to Pubsub via an underlying transport. */
 @SuppressWarnings({
   "nullness" // TODO(https://github.com/apache/beam/issues/20497)
 })
 public abstract class PubsubClient implements Closeable {
+  private static final Logger LOG = LoggerFactory.getLogger(PubsubClient.class);
   private static final Map<String, SerializableFunction<String, Schema>>
       schemaTypeToConversionFnMap =
           ImmutableMap.of(
@@ -257,6 +260,10 @@ public String getFullPath() {
       return String.format("/subscriptions/%s/%s", projectId, subscriptionName);
     }
 
+    public String getDataCatalogName() {
+      return String.format("pubsub:subscription:%s.%s", projectId, subscriptionName);
+    }
+
     @Override
     public boolean equals(@Nullable Object o) {
       if (this == o) {
@@ -293,6 +300,7 @@ public static SubscriptionPath subscriptionPathFromName(
 
   /** Path representing a Pubsub topic. */
   public static class TopicPath implements Serializable {
+    // Format: "projects/<project>/topics/<topic>"
     private final String path;
 
     TopicPath(String path) {
@@ -310,6 +318,26 @@ public String getName() {
       return splits.get(3);
     }
 
+    /**
+     * Returns the data catalog name. Format "pubsub:topic:`project`.`topic`" This method is
+     * fail-safe. If topic path is malformed, it returns an empty string.
+     */
+    public String getDataCatalogName() {
+      List<String> splits = Splitter.on('/').splitToList(path);
+      if (splits.size() == 4) {
+        // well-formed path
+        return String.format("pubsub:topic:%s.%s", splits.get(1), splits.get(3));
+      } else {
+        // Mal-formed path. It is either a test fixture or user error and will fail on publish.
+        // We do not throw exception instead return empty string here.
+        LOG.warn(
+            "Cannot get data catalog name for malformed topic path {}. Expected format: "
+                + "projects/<project>/topics/<topic>",
+            path);
+        return "";
+      }
+    }
+
     public String getFullPath() {
       List<String> splits = Splitter.on('/').splitToList(path);
       checkState(splits.size() == 4, "Malformed topic path %s", path);

sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/pubsub/PubsubIO.java

@@ -49,6 +49,7 @@
 import org.apache.beam.sdk.io.gcp.pubsub.PubsubClient.OutgoingMessage;
 import org.apache.beam.sdk.io.gcp.pubsub.PubsubClient.SubscriptionPath;
 import org.apache.beam.sdk.io.gcp.pubsub.PubsubClient.TopicPath;
+import org.apache.beam.sdk.metrics.Lineage;
 import org.apache.beam.sdk.options.ValueProvider;
 import org.apache.beam.sdk.options.ValueProvider.NestedValueProvider;
 import org.apache.beam.sdk.options.ValueProvider.StaticValueProvider;
@@ -512,6 +513,10 @@ public String asPath() {
       }
     }
 
+    public String dataCatalogName() {
+      return String.format("pubsub:topic:%s.%s", project, topic);
+    }
+
     @Override
     public String toString() {
       return asPath();
@@ -1617,6 +1622,10 @@ public void finishBundle() throws IOException {
         for (Map.Entry<PubsubTopic, OutgoingData> entry : output.entrySet()) {
           publish(entry.getKey(), entry.getValue().messages);
         }
+        // Report lineage for all topics seen
+        for (PubsubTopic topic : output.keySet()) {
+          Lineage.getSinks().add(topic.dataCatalogName());
+        }
         output = null;
         pubsubClient.close();
         pubsubClient = null;

sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/pubsub/PubsubUnboundedSink.java

@@ -41,6 +41,7 @@
 import org.apache.beam.sdk.io.gcp.pubsub.PubsubClient.PubsubClientFactory;
 import org.apache.beam.sdk.io.gcp.pubsub.PubsubClient.TopicPath;
 import org.apache.beam.sdk.metrics.Counter;
+import org.apache.beam.sdk.metrics.Lineage;
 import org.apache.beam.sdk.metrics.Metrics;
 import org.apache.beam.sdk.metrics.SinkMetrics;
 import org.apache.beam.sdk.options.ValueProvider;
@@ -69,6 +70,7 @@
 import org.apache.beam.sdk.values.TypeDescriptors;
 import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.annotations.VisibleForTesting;
 import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.base.Preconditions;
+import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.base.Strings;
 import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.hash.Hashing;
 import org.checkerframework.checker.nullness.qual.Nullable;
 import org.joda.time.Duration;
@@ -231,6 +233,9 @@ private static class WriterFn extends DoFn<Iterable<OutgoingMessage>, Void> {
     /** Client on which to talk to Pubsub. Null until created by {@link #startBundle}. */
     private transient @Nullable PubsubClient pubsubClient;
 
+    /** Last TopicPath that reported Lineage. */
+    private transient @Nullable TopicPath reportedLineage;
+
     private final Counter batchCounter = Metrics.counter(WriterFn.class, "batches");
     private final Counter elementCounter = SinkMetrics.elementsWritten();
     private final Counter byteCounter = SinkMetrics.bytesWritten();
@@ -290,6 +295,14 @@ private void publishBatch(List<OutgoingMessage> messages, int bytes) throws IOEx
       batchCounter.inc();
       elementCounter.inc(messages.size());
       byteCounter.inc(bytes);
+      // Report Lineage multiple once for same topic
+      if (!topicPath.equals(reportedLineage)) {
+        String name = topicPath.getDataCatalogName();
+        if (!Strings.isNullOrEmpty(name)) {
+          Lineage.getSinks().add(topicPath.getDataCatalogName());
+        }
+        reportedLineage = topicPath;
+      }
     }
 
     @StartBundle

sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/pubsub/PubsubUnboundedSource.java

@@ -56,6 +56,7 @@
 import org.apache.beam.sdk.io.gcp.pubsub.PubsubClient.TopicPath;
 import org.apache.beam.sdk.io.gcp.pubsub.PubsubMessages.DeserializeBytesIntoPubsubMessagePayloadOnly;
 import org.apache.beam.sdk.metrics.Counter;
+import org.apache.beam.sdk.metrics.Lineage;
 import org.apache.beam.sdk.metrics.SourceMetrics;
 import org.apache.beam.sdk.options.ExperimentalOptions;
 import org.apache.beam.sdk.options.PipelineOptions;
@@ -1041,6 +1042,19 @@ public List<PubsubSource> split(int desiredNumSplits, PipelineOptions options)
         splitSource =
             new PubsubSource(
                 outer, StaticValueProvider.of(outer.createRandomSubscription(options)));
+        TopicPath topic = outer.getTopic();
+        if (topic != null) {
+          // is initial split on Read.fromTopic, report Lineage based on topic
+          Lineage.getSources().add(topic.getDataCatalogName());
+        }
+      } else {
+        if (subscriptionPath.equals(outer.getSubscriptionProvider())) {
+          SubscriptionPath sub = subscriptionPath.get();
+          if (sub != null) {
+            // is a split on Read.fromSubscription
+            Lineage.getSources().add(sub.getDataCatalogName());
+          }
+        }
       }
       for (int i = 0; i < desiredNumSplits * SCALE_OUT; i++) {
         // Since the source is immutable and Pubsub automatically shards we simply

sdks/java/io/google-cloud-platform/src/test/java/org/apache/beam/sdk/io/gcp/pubsub/PubsubClientTest.java

@@ -171,13 +171,15 @@ public void subscriptionPathFromNameWellFormed() {
     SubscriptionPath path = PubsubClient.subscriptionPathFromName("test", "something");
     assertEquals("projects/test/subscriptions/something", path.getPath());
     assertEquals("/subscriptions/test/something", path.getFullPath());
+    assertEquals("pubsub:subscription:test.something", path.getDataCatalogName());
   }
 
   @Test
   public void topicPathFromNameWellFormed() {
     TopicPath path = PubsubClient.topicPathFromName("test", "something");
     assertEquals("projects/test/topics/something", path.getPath());
     assertEquals("/topics/test/something", path.getFullPath());
+    assertEquals("pubsub:topic:test.something", path.getDataCatalogName());
   }
 
   @Test

sdks/java/io/google-cloud-platform/src/test/java/org/apache/beam/sdk/io/gcp/pubsub/PubsubIOTest.java

@@ -237,6 +237,9 @@ public void testValueProviderTopic() {
     assertThat(pubsubRead.getTopicProvider(), not(nullValue()));
     assertThat(pubsubRead.getTopicProvider().isAccessible(), is(true));
     assertThat(pubsubRead.getTopicProvider().get().asPath(), equalTo(provider.get()));
+    assertThat(
+        pubsubRead.getTopicProvider().get().dataCatalogName(),
+        equalTo("pubsub:topic:project.topic"));
   }
 
   @Test