BewareMyPower opened a new pull request, #219:
URL: https://github.com/apache/pulsar-client-node/pull/219
There is a segmentation fault reported by the user.
> So, I recompiled the extension with `node-gyp rebuild --debug` then
attached a debugger and it crashed because of this
>
> ```
> (gdb) l
> 60 void MessageListenerProxy(Napi::Env env, Napi::Function
jsCallback, MessageListenerProxyData *data) {
> 61 Napi::Object msg = Message::NewInstance({}, data->cMessage);
> 62 Consumer *consumer = data->consumer;
> 63 delete data;
> 64
> 65 jsCallback.Call({msg, consumer->Value()});
> 66 }
> 67
> 68 void MessageListener(pulsar_consumer_t *cConsumer,
pulsar_message_t *cMessage, void *ctx) {
> 69 ListenerCallback *listenerCallback = (ListenerCallback *)ctx;
> (gdb)
> ```
The `consumer` field is assigned from `MessageListenerCallback` and the
initial value is `nullptr`. This field could only be modified in
`Consumer::SetListenerCallback`. I didn't look deeper into where it's invoked,
but I think it's better to add the null check here for safety.
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