k2la opened a new pull request #159:
URL: https://github.com/apache/pulsar-client-node/pull/159
### Motivation
I run the following code with valgrind and it looks like there are a memory
leak in MessageId::ToString.
```
// Receive messages
for (let i = 0; i < 1000; i += 1) {
const msg = await consumer.receive();
console.log(msg.getMessageId().toString());
console.log(msg.getData().toString());
consumer.acknowledge(msg);
}
```
```
...
==20476== 13,890 bytes in 1,000 blocks are definitely lost in loss record 68
of 68
==20476== at 0x4C29F73: malloc (vg_replace_malloc.c:309)
==20476== by 0x5B03BD9: strndup (in /usr/lib64/libc-2.17.so)
==20476== by 0x9EA3D74: pulsar_message_id_str (in
/usr/lib/libpulsar.so.2.7.1)
==20476== by 0x9A73E6A: MessageId::ToString(Napi::CallbackInfo const&)
(in /home/k2la/pulsar-client-node/build/Release/Pulsar.node)
==20476== by 0x9A7BFE0:
Napi::ObjectWrap<MessageId>::InstanceMethodCallbackWrapper(napi_env__*,
napi_callback_info__*) (in
/home/k2la/pulsar-client-node/build/Release/Pulsar.node)
==20476== by 0x9D1E04: v8impl::(anonymous
namespace)::FunctionCallbackWrapper::Invoke(v8::FunctionCallbackInfo<v8::Value>
const&) (in /usr/bin/node)
==20476== by 0xC065F8: v8::internal::MaybeHandle<v8::internal::Object>
v8::internal::(anonymous
namespace)::HandleApiCallHelper<false>(v8::internal::Isolate*,
v8::internal::Handle<v8::internal::HeapObject>,
v8::internal::Handle<v8::internal::HeapObject>,
v8::internal::Handle<v8::internal::FunctionTemplateInfo>,
v8::internal::Handle<v8::internal::Object>, v8::internal::BuiltinArguments) (in
/usr/bin/node)
==20476== by 0xC083E6: v8::internal::Builtin_HandleApiCall(int, unsigned
long*, v8::internal::Isolate*) (in /usr/bin/node)
==20476== by 0x140DF98: ??? (in /usr/bin/node)
==20476== by 0x1393723: ??? (in /usr/bin/node)
==20476== by 0x13BDFD2: ??? (in /usr/bin/node)
==20476== by 0x13E26D1: ??? (in /usr/bin/node)
...
```
### Modification
Free `char*` value obtained by `pulsar_message_id_str`.
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