uWSGI log encoder example

gistfile1.c

#include <uwsgi.h>

static char *log_encoder_add_worker(struct uwsgi_log_encoder *ule, char *msg, size_t len, size_t *rlen) {
        char *buf = NULL;
        // 64 bytes for worker id should be enough, btw the buffer will be adapted automatically
        struct uwsgi_buffer *ub = uwsgi_buffer_new(len + 64);
        // add current pid
        if (uwsgi_buffer_num64(ub, getpid())) goto end;
        // add a space
        if (uwsgi_buffer_byte(ub, ' ')) goto end;
        // append the original message
        if (uwsgi_buffer_append(ub, msg, len)) goto end;
        // set the size of the new string
        *rlen = ub->pos;
        // set the new log line
        buf = ub->buf;
        // avoid the memory to be destroyed
        ub->buf = NULL;
end:
        uwsgi_buffer_destroy(ub);
        return buf;
}

static void myencoder_register() {
        uwsgi_register_log_encoder("myencoder", log_encoder_add_worker);
}

struct uwsgi_plugin myencoder_plugin = {
        .name = "myencoder",
        .on_load = myencoder_register,
};