sample code for filter plugin

filter.c

#include <unistd.h>
#include <fluent-bit.h>
#include <msgpack.h>

int my_stdout_json(void* data, size_t size)
{
    printf("[%s]",__FUNCTION__);
    printf("%s",(char*)data);
    printf("\n");

    /* User has to release the buffer. */
    flb_free(data);

    return 0;
}

int main()
{
    flb_ctx_t *ctx;
    int in_ffd;
    int out_ffd;
    int filter_ffd;

    /* Initialize library */
    ctx = flb_create();
    if (!ctx) {
        exit(EXIT_FAILURE);
    }

    in_ffd = flb_input(ctx, "cpu", NULL);
    flb_input_set(ctx, in_ffd, "tag", "test", NULL);
    out_ffd = flb_output(ctx, "lib", my_stdout_json);
    flb_output_set(ctx, out_ffd, "match", "test", "format", "json", NULL);

    filter_ffd = flb_filter(ctx, "stdout", NULL);
    flb_filter_set(ctx, filter_ffd, "match", "*", NULL);

    /* Start the background worker */
    flb_start(ctx);

    sleep(10);

    flb_stop(ctx);

    /* Release Resources */
    flb_destroy(ctx);

    return 0;
}