librdkafka 0.8 logger callback error

[zbweng]

Hi, Magnus.
librdkafka 0.8 provides a callback for logger. The comment of function "rd_kafka_set_logger" mentions that "Alternatively the application may provide its own logger callback".
However, when I provide my logger callback, some compiler errors occur.

error: invalid use of incomplete type ‘const rd_kafka_t {aka const struct rd_kafka_s}’
/usr/local/include/librdkafka/rdkafka.h:59:16: error: forward declaration of ‘const rd_kafka_t {aka const struct rd_kafka_s}’

I wonder whether I use logger callback correctly.

Thanks.

[edenhill]

I cant reproduce this issue, could you provide the relevant parts of your code?

This works for me:

#include <librdkafka/rdkafka.h>
...
static void logger (const rd_kafka_t *rk, int level,
const char *fac, const char *buf) {
fprintf(stderr, "RDKAFKA-%i-%s: %s: %s\n",
level, fac, rd_kafka_name(rk), buf);
}

....

int main (...) {
...
rk = rd_kafka_new(....);
rd_kafka_set_logger(rk, logger);
...

[zbweng]

Hi, Magnus.
Thank you for your reply.

I find that I used "rk->rk_name" in my c++ code. This causes the compilation error above since the compiler could not find the definition of "rd_kafka_t". What a stupid mistake!
When I use "rd_kafka_name(const_cast<rd_kafka_t *>(rk))" instead, the compilation error disappears.

[edenhill]

Did you mean to reopen this issue?

[zbweng]

No. Actually, I am new to Github. This is a misoperation. I hope you don't mind. :)
Thank you for solving my problem.