[GitHub] [pulsar] BewareMyPower opened a new issue, #16761: [C++] getLastMessageIdAsync returns ResultNotConnected after seek

[GitBox <gi...@apache.org>]

BewareMyPower opened a new issue, #16761:
URL: https://github.com/apache/pulsar/issues/16761

   **Describe the bug**
   When C++ client calls `ConsumerImpl::getLastMessageIdAsync`, if the connection is not established, the callback will complete with `ResultNotConnected`.
   
   **To Reproduce**
   Add the following test to `ReaderTest.cc` and run it.
   
   ```c++
   TEST(ReaderTest, testReceiveAfterSeek) {
       Client client(serviceUrl);
       const std::string topic = "reader-test-receive-after-seek-" + std::to_string(time(nullptr));
   
       Producer producer;
       ASSERT_EQ(ResultOk, client.createProducer(topic, producer));
   
       MessageId seekMessageId;
       for (int i = 0; i < 5; i++) {
           MessageId messageId;
           producer.send(MessageBuilder().setContent("msg-" + std::to_string(i)).build(), messageId);
           if (i == 3) {
               seekMessageId = messageId;
           }
       }
   
       Reader reader;
       ASSERT_EQ(ResultOk, client.createReader(topic, MessageId::latest(), {}, reader));
   
       reader.seek(seekMessageId);
   
       bool hasMessageAvailable;
       // it returns ResultNotConnected because hasMessageAvailable calls getLastMessageIdAsync internally
       ASSERT_EQ(ResultOk, reader.hasMessageAvailable(hasMessageAvailable));
   
       client.close();
   }
   ```
   
   **Expected behavior**
   `getLastMessageIdAsync` should wait until the connection is established like `ConsumerImpl#internalGetLastMessageIdAsync` in Java client.
   
   Currently, a workaround is to manually wait until `hasMessageAvailable` doesn't return `ResultNotConnected`, e.g.
   
   ```c++
       bool hasMessageAvailable;
       while (reader.hasMessageAvailable(hasMessageAvailable) == ResultNotConnected) {
           std::this_thread::sleep_for(std::chrono::milliseconds(100));
       }
   ```


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[GitHub] [pulsar] RobertIndie closed issue #16761: [C++] getLastMessageIdAsync returns ResultNotConnected after seek

[GitBox <gi...@apache.org>]

RobertIndie closed issue #16761: [C++] getLastMessageIdAsync returns ResultNotConnected after seek
URL: https://github.com/apache/pulsar/issues/16761


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