feat: Support configure startMessageIdInclusive for the reader (#157)

Author: RobertIndie

pulsar/__init__.py

@@ -966,7 +966,8 @@ def create_reader(self, topic, start_message_id,
                       reader_name=None,
                       subscription_role_prefix=None,
                       is_read_compacted=False,
-                      crypto_key_reader=None
+                      crypto_key_reader=None,
+                      start_message_id_inclusive=False
                       ):
         """
         Create a reader on a particular topic
@@ -1025,6 +1026,8 @@ def my_listener(reader, message):
         crypto_key_reader: CryptoKeyReader, optional
             Symmetric encryption class implementation, configuring public key encryption messages for the producer
             and private key decryption messages for the consumer
+        start_message_id_inclusive: bool, default=False
+            Set the reader to include the startMessageId or given position of any reset operation like Reader.seek
         """
 
         # If a pulsar.MessageId object is passed, access the _pulsar.MessageId object
@@ -1039,6 +1042,7 @@ def my_listener(reader, message):
         _check_type_or_none(str, subscription_role_prefix, 'subscription_role_prefix')
         _check_type(bool, is_read_compacted, 'is_read_compacted')
         _check_type_or_none(CryptoKeyReader, crypto_key_reader, 'crypto_key_reader')
+        _check_type(bool, start_message_id_inclusive, 'start_message_id_inclusive')
 
         conf = _pulsar.ReaderConfiguration()
         if reader_listener:
@@ -1052,6 +1056,7 @@ def my_listener(reader, message):
         conf.read_compacted(is_read_compacted)
         if crypto_key_reader:
             conf.crypto_key_reader(crypto_key_reader.cryptoKeyReader)
+        conf.start_message_id_inclusive(start_message_id_inclusive)
 
         c = Reader()
         c._reader = self._client.create_reader(topic, start_message_id, conf)

src/config.cc

@@ -318,5 +318,7 @@ void export_config(py::module_& m) {
         .def("subscription_role_prefix", &ReaderConfiguration::setSubscriptionRolePrefix)
         .def("read_compacted", &ReaderConfiguration::isReadCompacted)
         .def("read_compacted", &ReaderConfiguration::setReadCompacted)
-        .def("crypto_key_reader", &ReaderConfiguration::setCryptoKeyReader, return_value_policy::reference);
+        .def("crypto_key_reader", &ReaderConfiguration::setCryptoKeyReader, return_value_policy::reference)
+        .def("start_message_id_inclusive", &ReaderConfiguration::isStartMessageIdInclusive)
+        .def("start_message_id_inclusive", &ReaderConfiguration::setStartMessageIdInclusive, return_value_policy::reference);
 }

tests/pulsar_test.py

@@ -19,6 +19,7 @@
 #
 
 
+import random
 import threading
 import logging
 from unittest import TestCase, main
@@ -685,6 +686,41 @@ def test_reader_is_connected(self):
         self.assertFalse(reader.is_connected())
         client.close()
 
+    def test_reader_seek_for_message_id(self):
+        client = pulsar.Client(self.serviceUrl)
+
+        topic = "test-seek-for-message-id-" + str(int(time.time()))
+
+        producer = client.create_producer(topic)
+
+        readerExclusive = client.create_reader(topic, MessageId.latest)
+        readerInclusive = client.create_reader(topic, MessageId.latest, start_message_id_inclusive=True)
+
+        numMessages = 100
+        seekMessageId = None
+
+        r = random.randint(0, numMessages - 2)
+        for i in range(numMessages):
+            msg_content = b"msg-%d" % i
+            id = producer.send(msg_content)
+
+            if i == r:
+                seekMessageId = id
+
+        readerExclusive.seek(seekMessageId)
+        msg0 = readerExclusive.read_next(timeout_millis=3000)
+
+        readerInclusive.seek(seekMessageId)
+        msg1 = readerInclusive.read_next(timeout_millis=3000)
+
+        self.assertEqual(msg0.data(), b"msg-%d" % (r + 1))
+        self.assertEqual(msg1.data(), b"msg-%d" % r)
+
+        readerExclusive.close()
+        readerInclusive.close()
+        producer.close()
+        client.close()
+
     def test_producer_sequence_after_reconnection(self):
         # Enable deduplication on namespace
         doHttpPost(self.adminUrl + "/admin/v2/namespaces/public/default/deduplication", "true")