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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