Set key for message when using function publish

pulsar-client-cpp/python/pulsar/functions/context.py

@@ -118,15 +118,43 @@ def get_secret(self, secret_name):
     """Returns the secret value associated with the name. None if nothing was found"""
     pass
 
+  @abstractmethod
+  def get_partition_key(self):
+    """Returns partition key of the input message is one exists"""
+    pass
+
+
   @abstractmethod
   def record_metric(self, metric_name, metric_value):
     """Records the metric_value. metric_value has to satisfy isinstance(metric_value, numbers.Number)"""
     pass
 
   @abstractmethod
   def publish(self, topic_name, message, serde_class_name="serde.IdentitySerDe", properties=None, compression_type=None, callback=None):
+    """
+
+    DEPRECATED
+
+    Publishes message to topic_name by first serializing the message using serde_class_name serde
+    The message will have properties specified if any
+    """
+    pass
+
+  @abstractmethod
+  def publish(self, topic_name, message, serde_class_name="serde.IdentitySerDe", compression_type=None, callback=None, message_conf=None):
     """Publishes message to topic_name by first serializing the message using serde_class_name serde
-    The message will have properties specified if any"""
+    The message will have properties specified if any
+
+    The available options for message_conf:
+
+      properties,
+      partition_key,
+      sequence_id,
+      replication_clusters,
+      disable_replication,
+      event_timestamp
+
+    """
     pass
 
   @abstractmethod

pulsar-functions/api-java/src/main/java/org/apache/pulsar/functions/api/Context.java

@@ -84,6 +84,7 @@ public interface Context {
 
     /**
      * The id of the function that we are executing
+     *
      * @return The function id
      */
     String getFunctionId();
@@ -119,16 +120,17 @@ public interface Context {
     /**
      * Increment the builtin distributed counter referred by key.
      *
-     * @param key The name of the key
+     * @param key    The name of the key
      * @param amount The amount to be incremented
      */
     void incrCounter(String key, long amount);
 
+
     /**
      * Increment the builtin distributed counter referred by key
      * but dont wait for the completion of the increment operation
      *
-     * @param key The name of the key
+     * @param key    The name of the key
      * @param amount The amount to be incremented
      */
     CompletableFuture<Void> incrCounterAsync(String key, long amount);
@@ -153,15 +155,15 @@ public interface Context {
     /**
      * Update the state value for the key.
      *
-     * @param key name of the key
+     * @param key   name of the key
      * @param value state value of the key
      */
     void putState(String key, ByteBuffer value);
 
     /**
      * Update the state value for the key, but don't wait for the operation to be completed
      *
-     * @param key name of the key
+     * @param key   name of the key
      * @param value state value of the key
      */
     CompletableFuture<Void> putStateAsync(String key, ByteBuffer value);
@@ -218,19 +220,17 @@ public interface Context {
      * Record a user defined metric.
      *
      * @param metricName The name of the metric
-     * @param value The value of the metric
+     * @param value      The value of the metric
      */
     void recordMetric(String metricName, double value);
 
     /**
-     * Publish an object using serDe for serializing to the topic.
+     * Publish an object using serDe or schema class for serializing to the topic.
      *
-     * @param topicName
-     *            The name of the topic for publishing
-     * @param object
-     *            The object that needs to be published
-     * @param schemaOrSerdeClassName
-     *            Either a builtin schema type (eg: "avro", "json", "protobuf") or the class name of the custom schema class
+     * @param topicName              The name of the topic for publishing
+     * @param object                 The object that needs to be published
+     * @param schemaOrSerdeClassName Either a builtin schema type (eg: "avro", "json", "protobuf") or the class name
+     *                               of the custom schema class
      * @return A future that completes when the framework is done publishing the message
      */
     <O> CompletableFuture<Void> publish(String topicName, O object, String schemaOrSerdeClassName);
@@ -239,9 +239,30 @@ public interface Context {
      * Publish an object to the topic using default schemas.
      *
      * @param topicName The name of the topic for publishing
-     * @param object The object that needs to be published
+     * @param object    The object that needs to be published
      * @return A future that completes when the framework is done publishing the message
      */
     <O> CompletableFuture<Void> publish(String topicName, O object);
 
+    /**
+     * Publish an object using serDe or schema class for serializing to the topic.
+     *
+     * @param topicName              The name of the topic for publishing
+     * @param object                 The object that needs to be published
+     * @param schemaOrSerdeClassName Either a builtin schema type (eg: "avro", "json", "protobuf") or the class name
+     *                               of the custom schema class
+     * @param messageConf      A map of configurations to set for the message that will be published
+     *                         The available options are:
+     *
+     *                         "key" - Parition Key
+     *                         "properties" - Map of properties
+     *                         "eventTime"
+     *                         "sequenceId"
+     *                         "replicationClusters"
+     *                         "disableReplication"
+     *
+     * @return A future that completes when the framework is done publishing the message
+     */
+    <O> CompletableFuture<Void> publish(String topicName, O object, String schemaOrSerdeClassName, Map<String, Object> messageConf);
+
 }

pulsar-functions/instance/src/main/java/org/apache/pulsar/functions/instance/ContextImpl.java

@@ -32,6 +32,7 @@
 import org.apache.pulsar.client.api.PulsarClient;
 import org.apache.pulsar.client.api.PulsarClientException;
 import org.apache.pulsar.client.api.Schema;
+import org.apache.pulsar.client.api.TypedMessageBuilder;
 import org.apache.pulsar.client.impl.ProducerBuilderImpl;
 import org.apache.pulsar.common.util.FutureUtil;
 import org.apache.pulsar.functions.api.Context;
@@ -258,7 +259,7 @@ public String getSecret(String secretName) {
             return null;
         }
     }
-
+    
     private void ensureStateEnabled() {
         checkState(null != stateContext, "State is not enabled.");
     }
@@ -336,11 +337,17 @@ public <O> CompletableFuture<Void> publish(String topicName, O object) {
     @SuppressWarnings("unchecked")
     @Override
     public <O> CompletableFuture<Void> publish(String topicName, O object, String schemaOrSerdeClassName) {
-        return publish(topicName, object, (Schema<O>) topicSchema.getSchema(topicName, object, schemaOrSerdeClassName, false));
+        return publish(topicName, object, schemaOrSerdeClassName, null);
+    }
+
+    @SuppressWarnings("unchecked")
+    @Override
+    public <O> CompletableFuture<Void> publish(String topicName, O object, String schemaOrSerdeClassName, Map<String, Object> messageConf) {
+        return publish(topicName, object, (Schema<O>) topicSchema.getSchema(topicName, object, schemaOrSerdeClassName, false), messageConf);
     }
 
     @SuppressWarnings("unchecked")
-    public <O> CompletableFuture<Void> publish(String topicName, O object, Schema<O> schema) {
+    public <O> CompletableFuture<Void> publish(String topicName, O object, Schema<O> schema, Map<String, Object> messageConf) {
         Producer<O> producer = (Producer<O>) publishProducers.get(topicName);
 
         if (producer == null) {
@@ -382,7 +389,11 @@ public <O> CompletableFuture<Void> publish(String topicName, O object, Schema<O>
             }
         }
 
-        CompletableFuture<Void> future = producer.sendAsync(object).thenApply(msgId -> null);
+        TypedMessageBuilder<O> messageBuilder = producer.newMessage();
+        if (messageConf != null) {
+            messageBuilder.loadConf(messageConf);
+        }
+        CompletableFuture<Void> future = messageBuilder.value(object).sendAsync().thenApply(msgId -> null);
         future.exceptionally(e -> {
             this.statsManager.incrSysExceptions(e);
             logger.error("Failed to publish to topic {} with error {}", topicName, e);

pulsar-functions/instance/src/main/python/contextimpl.py

@@ -90,6 +90,9 @@ def get_message_properties(self):
   def get_current_message_topic_name(self):
     return self.message.topic_name()
 
+  def get_partition_key(self):
+    return self.message.partition_key()
+
   def get_function_name(self):
     return self.instance_config.function_details.name
 
@@ -147,6 +150,9 @@ def callback_wrapper(self, callback, topic, message_id, result, msg):
       callback(result, msg)
 
   def publish(self, topic_name, message, serde_class_name="serde.IdentitySerDe", properties=None, compression_type=None, callback=None):
+    self.publish(topic_name, message, serde_class_name=serde_class_name, compression_type=compression_type, callback=callback, message_conf={"properties": properties})
+
+  def publish(self, topic_name, message, serde_class_name="serde.IdentitySerDe", compression_type=None, callback=None, message_conf=None):
     # Just make sure that user supplied values are properly typed
     topic_name = str(topic_name)
     serde_class_name = str(serde_class_name)
@@ -172,7 +178,13 @@ def publish(self, topic_name, message, serde_class_name="serde.IdentitySerDe", p
       self.publish_serializers[serde_class_name] = serde_klass()
 
     output_bytes = bytes(self.publish_serializers[serde_class_name].serialize(message))
-    self.publish_producers[topic_name].send_async(output_bytes, partial(self.callback_wrapper, callback, topic_name, self.get_message_id()), properties=properties)
+
+    if message_conf:
+      self.publish_producers[topic_name].send_async(
+        output_bytes, partial(self.callback_wrapper, callback, topic_name, self.get_message_id()), **message_conf)
+    else:
+      self.publish_producers[topic_name].send_async(
+        output_bytes, partial(self.callback_wrapper, callback, topic_name, self.get_message_id()))
 
   def ack(self, msgid, topic):
     topic_consumer = None

pulsar-functions/instance/src/test/java/org/apache/pulsar/functions/instance/ContextImplTest.java

@@ -21,9 +21,13 @@
 import io.prometheus.client.CollectorRegistry;
 import org.apache.pulsar.client.api.Producer;
 import org.apache.pulsar.client.api.Schema;
+import org.apache.pulsar.client.api.TypedMessageBuilder;
+import org.apache.pulsar.client.impl.ProducerBase;
 import org.apache.pulsar.client.impl.ProducerBuilderImpl;
 import org.apache.pulsar.client.impl.PulsarClientImpl;
+import org.apache.pulsar.client.impl.TypedMessageBuilderImpl;
 import org.apache.pulsar.client.impl.conf.ProducerConfigurationData;
+import org.apache.pulsar.functions.api.Record;
 import org.apache.pulsar.functions.instance.state.StateContextImpl;
 import org.apache.pulsar.functions.proto.Function.FunctionDetails;
 import org.apache.pulsar.functions.secretsprovider.EnvironmentBasedSecretsProvider;
@@ -38,10 +42,14 @@
 import java.util.concurrent.CompletableFuture;
 
 import static java.nio.charset.StandardCharsets.UTF_8;
+import static org.mockito.Matchers.any;
 import static org.mockito.Matchers.anyString;
 import static org.mockito.Matchers.eq;
 import static org.mockito.Matchers.same;
+import static org.mockito.Mockito.doNothing;
+import static org.mockito.Mockito.doReturn;
 import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.spy;
 import static org.mockito.Mockito.times;
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
@@ -72,12 +80,22 @@ public void setup() {
         when(client.getSchema(anyString())).thenReturn(CompletableFuture.completedFuture(Optional.empty()));
         when(producer.sendAsync(anyString())).thenReturn(CompletableFuture.completedFuture(null));
 
+        TypedMessageBuilder messageBuilder = spy(new TypedMessageBuilderImpl(mock(ProducerBase.class), Schema.STRING));
+        doReturn(new CompletableFuture<>()).when(messageBuilder).sendAsync();
+        when(producer.newMessage()).thenReturn(messageBuilder);
+
         context = new ContextImpl(
             config,
             logger,
             client,
             new EnvironmentBasedSecretsProvider(), new CollectorRegistry(), new String[0],
                 ComponentType.FUNCTION, null);
+        context.setCurrentMessageContext(new Record<String>() {
+            @Override
+            public String getValue() {
+                return null;
+            }
+        });
     }
 
     @Test(expectedExceptions = IllegalStateException.class)

pulsar-functions/instance/src/test/python/test_python_instance.py

@@ -62,6 +62,7 @@ def test_context_publish(self):
 
     msg = Message()
     msg.message_id = Mock(return_value="test_message_id")
+    msg.partition_key = Mock(return_value="test_key")
     context_impl.set_current_message_context(msg, "test_topic_name")
 
     context_impl.publish("test_topic_name", "test_message")

pulsar-functions/java-examples/src/main/java/org/apache/pulsar/functions/api/examples/PublishFunctionWithMessageConf.java

@@ -0,0 +1,52 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.pulsar.functions.api.examples;
+
+import org.apache.pulsar.client.api.TypedMessageBuilder;
+import org.apache.pulsar.functions.api.Context;
+import org.apache.pulsar.functions.api.Function;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * Example function that uses the built in publish function in the context
+ * to publish to a desired topic based on config and setting various message configurations to be passed along.
+ *
+ */
+public class PublishFunctionWithMessageConf implements Function<String, Void> {
+    @Override
+    public Void process(String input, Context context) {
+        String publishTopic = (String) context.getUserConfigValueOrDefault("publish-topic", "publishtopic");
+        String output = String.format("%s!", input);
+
+        Map<String, String> properties = new HashMap<>();
+        properties.put("input_topic", context.getCurrentRecord().getTopicName().get());
+        properties.putAll(context.getCurrentRecord().getProperties());
+
+        Map<String, Object> messageConf = new HashMap<>();
+        messageConf.put(TypedMessageBuilder.CONF_PROPERTIES, properties);
+        if (context.getCurrentRecord().getKey().isPresent()) {
+            messageConf.put(TypedMessageBuilder.CONF_KEY, context.getCurrentRecord().getKey().get());
+        }
+        messageConf.put(TypedMessageBuilder.CONF_EVENT_TIME, System.currentTimeMillis());
+        context.publish(publishTopic, output, null, messageConf);
+        return null;
+    }
+}

pulsar-functions/python-examples/publish_function_with_message_conf.py

@@ -0,0 +1,38 @@
+#!/usr/bin/env python
+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+#
+
+import time
+from pulsar import Function
+
+# Example function that uses the built in publish function in the context
+# to publish to a desired topic based on config
+class PublishFunctionWithMessageConf(Function):
+  def __init__(self):
+    pass
+
+  def process(self, input, context):
+    publish_topic = "publishtopic"
+    if "publish-topic" in context.get_user_config_map():
+      publish_topic = context.get_user_config_value("publish-topic")
+    context.publish(publish_topic, input + '!',
+                    message_conf={"properties": {k: v for d in [{"input_topic" : context.get_current_message_topic_name()}, context.get_message_properties()] for k, v in d.items()},
+                                  "partition_key": context.get_partition_key(),
+                                  "event_timestamp": int(time.time())})
+    return