rdkafka_int.h

/*
 * librdkafka - Apache Kafka C library
 *
 * Copyright (c) 2012-2013, Magnus Edenhill
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met: 
 * 
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer. 
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution. 
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#pragma once

#include <sys/socket.h>
#include <netinet/in.h>
#include <fcntl.h>
#include <sys/queue.h>
#include <syslog.h>
#include <poll.h>

#include "rdkafka.h"
#include "rd.h"
#include "rdaddr.h"
#include "rdlog.h"


#define RD_POLL_INFINITE  -1
#define RD_POLL_NOWAIT     0


/*
 * Portability
 */

/* MacOSX does not have strndupa() */
#ifndef strndupa
#define strndupa(PTR,LEN) ({ int _L = (LEN); char *_x = alloca(_L+1); \
      memcpy(_x, (PTR), _L); *(_x+_L) = 0; _x;})
#endif

#ifndef strdupa
#define strdupa(PTR) ({ const char *_P = (PTR); int _L = strlen(_P); \
      char *_x = alloca(_L+1); memcpy(_x, _P, _L); *(_x+_L) = 0; _x;})
#endif

/* Some versions of MacOSX dont have IOV_MAX */
#ifndef IOV_MAX
#define IOV_MAX 1024
#endif





#include "rdkafka_proto.h"



/**
 * Protocol level sanity
 */
#define RD_KAFKAP_BROKERS_MAX     1000
#define RD_KAFKAP_TOPICS_MAX      10000
#define RD_KAFKAP_PARTITIONS_MAX  1000





struct rd_kafka_s;
struct rd_kafka_toppar_s;
struct rd_kafka_topic_s;
struct rd_kafka_msg_s;
struct rd_kafka_broker_s;
struct rd_kafka_conf_s;
struct rd_kafka_topic_conf_s;



/**
 * MessageSet compression codecs
 */
typedef enum {
	RD_KAFKA_COMPRESSION_NONE,
	RD_KAFKA_COMPRESSION_GZIP,   /* FIXME: not supported */
	RD_KAFKA_COMPRESSION_SNAPPY, /* FIXME: not supported */
} rd_kafka_compression_t;


/**
 * Optional configuration struct passed to rd_kafka_new*().
 *
 * The struct is populated ted through string properties
 * by calling rd_kafka_conf_set().
 *
 */
struct rd_kafka_conf_s {
	/*
	 * Generic configuration
	 */
	int     max_msg_size;
	int     metadata_request_timeout_ms;
	int     metadata_refresh_interval_ms;
	int     metadata_refresh_fast_cnt;
	int     metadata_refresh_fast_interval_ms;
	int     debug;
	int     broker_addr_ttl;
	int     socket_timeout_ms;
	char   *clientid;
	char   *brokerlist;
	int     stats_interval_ms;

	/*
	 * Consumer configuration
	 */
	int    queued_min_msgs;
	int    fetch_wait_max_ms;
	int    fetch_min_bytes;
	int    fetch_error_backoff_ms;
	/* Pre-built Fetch request header. */
	struct rd_kafkap_FetchRequest FetchRequest;


	/*
	 * Producer configuration
	 */
	int    queue_buffering_max_msgs;
	int    buffering_max_ms;
	int    max_retries;
	int    msg_send_max_retries;
	int    retry_backoff_ms;
	int    batch_num_messages;
	rd_kafka_compression_t compression_codec;

	/* Message delivery report callback.
	 * Called once for each produced message, either on
	 * successful and acknowledged delivery to the broker in which
	 * case 'err' is 0, or if the message could not be delivered
	 * in which case 'err' is non-zero (use rd_kafka_err2str()
	 * to obtain a human-readable error reason).
	 *
	 * If the message was produced with neither RD_KAFKA_MSG_F_FREE
	 * or RD_KAFKA_MSG_F_COPY set then 'payload' is the original
	 * pointer provided to rd_kafka_produce().
	 * rdkafka will not perform any further actions on 'payload'
	 * at this point and the application may free the payload data
	 * at this point.
	 *
	 * 'opaque' is 'conf.opaque', while 'msg_opaque' is
	 * the opaque pointer provided in the rd_kafka_produce() call.
	 */
	void (*dr_cb) (rd_kafka_t *rk,
		       void *payload, size_t len,
		       rd_kafka_resp_err_t err,
		       void *opaque, void *msg_opaque);

	/* Error callback */
	void (*error_cb) (rd_kafka_t *rk, int err,
			  const char *reason, void *opaque);

	/* Stats callback */
	int (*stats_cb) (rd_kafka_t *rk,
			 char *json,
			 size_t json_len,
			 void *opaque);


	/* Opaque passed to callbacks. */
	void  *opaque;
};



struct rd_kafka_topic_conf_s {
	int16_t required_acks;
	int32_t request_timeout_ms;
	int     message_timeout_ms;

	int32_t (*partitioner) (const rd_kafka_topic_t *rkt,
				const void *keydata, size_t keylen,
				int32_t partition_cnt,
				void *rkt_opaque,
				void *msg_opaque);

	/* Application provided opaque pointer (this is rkt_opaque) */
	void   *opaque;
};



typedef struct rd_kafka_msg_s {
	TAILQ_ENTRY(rd_kafka_msg_s)  rkm_link;
	int        rkm_flags;
	size_t     rkm_len;
	void      *rkm_payload;
	void      *rkm_opaque;
	int32_t    rkm_partition;  /* partition specified */
	rd_kafkap_bytes_t *rkm_key;
	rd_ts_t    rkm_ts_timeout;
} rd_kafka_msg_t;

typedef struct rd_kafka_msgq_s {
	TAILQ_HEAD(, rd_kafka_msg_s) rkmq_msgs;
	int        rkmq_msg_cnt;
	uint64_t   rkmq_msg_bytes;
} rd_kafka_msgq_t;

#define RD_KAFKA_MSGQ_INITIALIZER(rkmq) \
	{ rkmq_msgs: TAILQ_HEAD_INITIALIZER((rkmq).rkmq_msgs) }

#define RD_KAFKA_MSGQ_FOREACH(elm,head) \
	TAILQ_FOREACH(elm, &(head)->rkmq_msgs, rkm_link)


typedef struct rd_kafka_buf_s {
	TAILQ_ENTRY(rd_kafka_buf_s) rkbuf_link;

	int32_t rkbuf_corrid;
	
	rd_ts_t rkbuf_ts_retry;    /* Absolute send retry time */

	int     rkbuf_flags; /* RD_KAFKA_OP_F */
	struct msghdr rkbuf_msg;
	struct iovec *rkbuf_iov;
	int           rkbuf_iovcnt;
	size_t  rkbuf_of;          /* recv/send: byte offset */
	size_t  rkbuf_len;         /* send: total length */
	size_t  rkbuf_size;        /* allocated size */

	char   *rkbuf_buf;         /* Main buffer */
	char   *rkbuf_buf2;        /* Aux buffer */
	struct rd_kafkap_reqhdr rkbuf_reqhdr;
	struct rd_kafkap_reshdr rkbuf_reshdr;

	int32_t rkbuf_expected_size;  /* expected size of message */

	/* Response callback */
	void  (*rkbuf_cb) (struct rd_kafka_broker_s *,
			   int err,
			   struct rd_kafka_buf_s *reprkbuf,
			   struct rd_kafka_buf_s *reqrkbuf,
			   void *opaque);

	int     rkbuf_refcnt;
	void   *rkbuf_opaque;

	int     rkbuf_retries;

	rd_ts_t rkbuf_ts_enq;
	rd_ts_t rkbuf_ts_sent;
	rd_ts_t rkbuf_ts_timeout;

	rd_kafka_msgq_t rkbuf_msgq;
} rd_kafka_buf_t;


typedef struct rd_kafka_bufq_s {
	TAILQ_HEAD(, rd_kafka_buf_s) rkbq_bufs;
	int                          rkbq_cnt;
} rd_kafka_bufq_t;


typedef enum {
	RD_KAFKA_OP_FETCH,    /* Kafka thread -> Application */
	RD_KAFKA_OP_ERR,      /* Kafka thread -> Application */
	RD_KAFKA_OP_DR,       /* Kafka thread -> Application
			       * Produce message delivery report */
	RD_KAFKA_OP_STATS,    /* Kafka thread -> Application */

	RD_KAFKA_OP_METADATA_REQ, /* any -> Broker thread: request metadata */
} rd_kafka_op_type_t;

typedef struct rd_kafka_op_s {
	TAILQ_ENTRY(rd_kafka_op_s) rko_link;

	rd_kafka_op_type_t rko_type;
	int       rko_flags;
#define RD_KAFKA_OP_F_FREE        0x1  /* Free the payload when done with it. */
#define RD_KAFKA_OP_F_FLASH       0x2  /* Internal: insert at head of queue */
#define RD_KAFKA_OP_F_NO_RESPONSE 0x4  /* rkbuf: Not expecting a response */
	rd_kafka_msgq_t rko_msgq;

	/* For PRODUCE */
	rd_kafka_msg_t *rko_rkm;

	/* For ERR */
#define rko_err     rko_rkmessage.err
#define rko_payload rko_rkmessage.payload
#define rko_len     rko_rkmessage.len

	/* For FETCH */
	rd_kafka_message_t rko_rkmessage;
	rd_kafka_buf_t    *rko_rkbuf;

	/* For METADATA */
#define rko_rkt  rko_rkmessage.rkt

	/* For STATS */
#define rko_json      rko_rkmessage.payload
#define rko_json_len  rko_rkmessage.len

} rd_kafka_op_t;


typedef struct rd_kafka_q_s {
	pthread_mutex_t rkq_lock;
	pthread_cond_t  rkq_cond;
	TAILQ_HEAD(, rd_kafka_op_s) rkq_q;
	int             rkq_qlen;
} rd_kafka_q_t;





typedef enum {
	RD_KAFKA_CONFIGURED,
	RD_KAFKA_LEARNED,
} rd_kafka_confsource_t;


typedef struct rd_kafka_broker_s {
	TAILQ_ENTRY(rd_kafka_broker_s) rkb_link;

	int32_t             rkb_nodeid;
#define RD_KAFKA_NODEID_UA -1

	rd_sockaddr_list_t *rkb_rsal;
	time_t              rkb_t_rsal_last;
	int                 rkb_s; /* TCP socket */

	struct pollfd       rkb_pfd;

	uint32_t            rkb_corrid;

	rd_kafka_q_t        rkb_ops;

	TAILQ_HEAD(, rd_kafka_toppar_s) rkb_toppars;
	pthread_rwlock_t    rkb_toppar_lock;
	int                 rkb_toppar_cnt;

	rd_ts_t             rkb_ts_fetch_backoff;
	int                 rkb_fetching;

#define rd_kafka_broker_toppars_rdlock(rkb) \
	pthread_rwlock_rdlock(&(rkb)->rkb_toppar_lock)
#define rd_kafka_broker_toppars_wrlock(rkb) \
	pthread_rwlock_wrlock(&(rkb)->rkb_toppar_lock)
#define rd_kafka_broker_toppars_unlock(rkb) \
	pthread_rwlock_unlock(&(rkb)->rkb_toppar_lock)

	enum {
		RD_KAFKA_BROKER_STATE_DOWN,
		RD_KAFKA_BROKER_STATE_CONNECTING,
		RD_KAFKA_BROKER_STATE_UP,
	} rkb_state;

	rd_kafka_confsource_t  rkb_source;
	struct {
		uint64_t tx_bytes;
		uint64_t tx;    /* Kafka-messages (not payload msgs) */
		uint64_t tx_err;
		uint64_t tx_retries;

		uint64_t rx_bytes;
		uint64_t rx;    /* Kafka messages (not payload msgs) */
		uint64_t rx_err;
	} rkb_c;

	rd_ts_t             rkb_ts_metadata_poll; /* Next metadata poll time */
	int                 rkb_metadata_fast_poll_cnt; /* Perform fast
							 * metadata polls. */
	pthread_mutex_t     rkb_lock;
	pthread_t           rkb_thread;

	int                 rkb_refcnt;

	struct rd_kafka_s  *rkb_rk;

	struct {
		char msg[512];
		int  err;  /* errno */
	} rkb_err;

	rd_kafka_buf_t     *rkb_recv_buf;

	rd_kafka_bufq_t     rkb_outbufs;
	rd_kafka_bufq_t     rkb_waitresps;
	rd_kafka_bufq_t     rkb_retrybufs;

	char                rkb_name[128];      /* Display name */
	char                rkb_nodename[128];  /* host:port */


} rd_kafka_broker_t;

#define rd_kafka_broker_keep(rkb) rd_atomic_add(&(rkb)->rkb_refcnt, 1)
#define rd_kafka_broker_lock(rkb)   pthread_mutex_lock(&(rkb)->rkb_lock)
#define rd_kafka_broker_unlock(rkb) pthread_mutex_unlock(&(rkb)->rkb_lock)

/* rd_kafka_topic_t */
struct rd_kafka_topic_s {
	TAILQ_ENTRY(rd_kafka_topic_s) rkt_link;

	int                rkt_refcnt;

	pthread_rwlock_t   rkt_lock;
	rd_kafkap_str_t   *rkt_topic;
	struct rd_kafka_toppar_s  *rkt_ua;  /* unassigned partition */
	struct rd_kafka_toppar_s **rkt_p;
	int32_t            rkt_partition_cnt;

	TAILQ_HEAD(, rd_kafka_toppar_s) rkt_desp; /* Desired partitions
						   * that are not yet seen
						   * in the cluster. */

	struct rd_kafka_s *rkt_rk;

	rd_kafka_topic_conf_t rkt_conf;
};

#define rd_kafka_topic_rdlock(rkt)     pthread_rwlock_rdlock(&(rkt)->rkt_lock)
#define rd_kafka_topic_wrlock(rkt)     pthread_rwlock_wrlock(&(rkt)->rkt_lock)
#define rd_kafka_topic_unlock(rkt)     pthread_rwlock_unlock(&(rkt)->rkt_lock)

/**
 * Topic + Partition combination
 */
typedef struct rd_kafka_toppar_s {
	TAILQ_ENTRY(rd_kafka_toppar_s) rktp_rklink;  /* rd_kafka_t link */
	TAILQ_ENTRY(rd_kafka_toppar_s) rktp_rkblink; /* rd_kafka_broker_t link*/
	TAILQ_ENTRY(rd_kafka_toppar_s) rktp_rktlink; /* rd_kafka_topic_t link */
	rd_kafka_topic_t  *rktp_rkt;
	int32_t            rktp_partition;
	rd_kafka_broker_t *rktp_leader;  /* Leader broker */
	int                rktp_refcnt;
	pthread_mutex_t    rktp_lock;

	rd_kafka_msgq_t    rktp_msgq;      /* application->rdkafka queue.
					    * protected by rktp_lock */
	rd_kafka_msgq_t    rktp_xmit_msgq; /* internal broker xmit queue */

	rd_ts_t            rktp_ts_last_xmit;

	/* Consumer */
	rd_kafka_q_t       rktp_fetchq;          /* Queue of fetched messages
						  * from broker. */

	enum {
		RD_KAFKA_TOPPAR_FETCH_NONE = 0,
		RD_KAFKA_TOPPAR_FETCH_OFFSET_QUERY,
		RD_KAFKA_TOPPAR_FETCH_OFFSET_WAIT,
		RD_KAFKA_TOPPAR_FETCH_ACTIVE,
	} rktp_fetch_state;

	rd_ts_t            rktp_ts_offset_req_next;
	int64_t            rktp_query_offset;
	int64_t            rktp_next_offset;     /* Next offset to fetch */
	int64_t            rktp_app_offset;      /* Last offset delivered to
						  * application */
	int64_t            rktp_commited_offset; /* Last commited offset */
	int64_t            rktp_eof_offset;      /* The last offset we reported
						  * EOF for. */

	int                rktp_flags;
#define RD_KAFKA_TOPPAR_F_DESIRED  0x1      /* This partition is desired
					     * by a consumer. */
#define RD_KAFKA_TOPPAR_F_UNKNOWN  0x2      /* Topic is (not yet) seen on
					     * a broker. */
	struct {
		uint64_t tx_msgs;
		uint64_t tx_bytes;
	} rktp_c;
} rd_kafka_toppar_t;

#define rd_kafka_toppar_keep(rktp) rd_atomic_add(&(rktp)->rktp_refcnt, 1)
#define rd_kafka_toppar_destroy(rktp) do {				\
	if (rd_atomic_sub(&(rktp)->rktp_refcnt, 1) == 0)		\
		rd_kafka_toppar_destroy0(rktp);				\
	} while (0)
#define rd_kafka_toppar_lock(rktp)     pthread_mutex_lock(&(rktp)->rktp_lock)
#define rd_kafka_toppar_unlock(rktp)   pthread_mutex_unlock(&(rktp)->rktp_lock)

static const char *rd_kafka_toppar_name (const rd_kafka_toppar_t *rktp)
	RD_UNUSED;
static const char *rd_kafka_toppar_name (const rd_kafka_toppar_t *rktp) {
	static __thread char ret[256];

	snprintf(ret, sizeof(ret), "%.*s [%"PRId32"]",
		 RD_KAFKAP_STR_PR(rktp->rktp_rkt->rkt_topic),
		 rktp->rktp_partition);

	return ret;
}


/**
 * Kafka handle. (rd_kafka_t)
 */
struct rd_kafka_s {
	rd_kafka_q_t rk_rep;   /* kafka -> application reply queue */

	TAILQ_HEAD(, rd_kafka_broker_s) rk_brokers;
	TAILQ_HEAD(, rd_kafka_topic_s)  rk_topics;
	int              rk_topic_cnt;

	char             rk_name[128];
	rd_kafkap_str_t *rk_clientid;
	rd_kafka_conf_t  rk_conf;
	int              rk_flags;
	int              rk_terminate;
	pthread_mutex_t  rk_lock;
	int              rk_refcnt;
	rd_kafka_type_t  rk_type;
	struct timeval   rk_tv_state_change;
	union {
		struct {
			char    *topic;
			int32_t  partition;
			uint64_t offset;
			uint64_t app_offset;
			int      offset_file_fd;
		} consumer;
		struct {
			int msg_cnt;  /* current message count */
		} producer;
	} rk_u;
#define rk_consumer rk_u.consumer
#define rk_producer rk_u.producer

	void (*rk_log_cb) (const rd_kafka_t *rk, int level,
			   const char *fac,
			   const char *buf);
	int    rk_log_level;

	pthread_t rk_thread;

	struct {
		char msg[512];
		int  err;  /* errno */
	} rk_err;
};

#define rd_kafka_lock(rk)    pthread_mutex_lock(&(rk)->rk_lock)
#define rd_kafka_unlock(rk)  pthread_mutex_unlock(&(rk)->rk_lock)















/**
 * Debug contexts
 */
#define RD_KAFKA_DBG_GENERIC    0x1
#define RD_KAFKA_DBG_BROKER     0x2
#define RD_KAFKA_DBG_TOPIC      0x4
#define RD_KAFKA_DBG_METADATA   0x8
#define RD_KAFKA_DBG_PRODUCER   0x10
#define RD_KAFKA_DBG_QUEUE      0x20
#define RD_KAFKA_DBG_MSG        0x40
#define RD_KAFKA_DBG_ALL        0xff


void rd_kafka_log0 (const rd_kafka_t *rk, const char *extra, int level,
		   const char *fac, const char *fmt, ...)
	__attribute__((format (printf, 5, 6)));
#define rd_kafka_log(rk,level,fac,fmt...) rd_kafka_log0(rk,NULL,level,fac,fmt)
#define rd_kafka_dbg(rk,ctx,fac,fmt...) do {				  \
		if (unlikely((rk)->rk_conf.debug & RD_KAFKA_DBG_ ## ctx)) \
			rd_kafka_log0(rk,NULL,LOG_DEBUG,fac,fmt);	  \
	} while (0)

#define rd_rkb_log(rkb,level,fac,fmt...)				\
	rd_kafka_log0((rkb)->rkb_rk, (rkb)->rkb_name, level, fac, fmt)

#define rd_rkb_dbg(rkb,ctx,fac,fmt...) do {				\
		if (unlikely((rkb)->rkb_rk->rk_conf.debug &		\
			     RD_KAFKA_DBG_ ## ctx))			\
			rd_kafka_log0((rkb)->rkb_rk, (rkb)->rkb_name,	\
				      LOG_DEBUG, fac, fmt);		\
	} while (0)


void rd_kafka_q_init (rd_kafka_q_t *rkq);
void rd_kafka_q_destroy (rd_kafka_q_t *rkq);

/**
 * Enqueue the 'rko' op at the tail of the queue 'rkq'.
 *
 * Locality: any thread.
 */
static inline RD_UNUSED
void rd_kafka_q_enq (rd_kafka_q_t *rkq, rd_kafka_op_t *rko) {
	pthread_mutex_lock(&rkq->rkq_lock);
	TAILQ_INSERT_TAIL(&rkq->rkq_q, rko, rko_link);
	(void)rd_atomic_add(&rkq->rkq_qlen, 1);
	pthread_cond_signal(&rkq->rkq_cond);
	pthread_mutex_unlock(&rkq->rkq_lock);
}

/**
 * Concat all elements of 'srcq' onto tail of 'rkq'.
 * 'dstq' will be be locked, but 'srcq' will not.
 *
 * Locality: any thread.
 */
static inline RD_UNUSED
void rd_kafka_q_concat (rd_kafka_q_t *rkq, rd_kafka_q_t *srcq) {
	pthread_mutex_lock(&rkq->rkq_lock);
	TAILQ_CONCAT(&rkq->rkq_q, &srcq->rkq_q, rko_link);
	(void)rd_atomic_add(&rkq->rkq_qlen, srcq->rkq_qlen);
	pthread_cond_signal(&rkq->rkq_cond);
	pthread_mutex_unlock(&rkq->rkq_lock);
}

#define rd_kafka_q_len(rkq) ((rkq)->rkq_qlen)

rd_kafka_op_t *rd_kafka_q_pop (rd_kafka_q_t *rkq, int timeout_ms);

void rd_kafka_q_purge (rd_kafka_q_t *rkq);

size_t rd_kafka_q_move_cnt (rd_kafka_q_t *dstq, rd_kafka_q_t *srcq,
			    size_t cnt);


void rd_kafka_op_destroy (rd_kafka_op_t *rko);
rd_kafka_op_t *rd_kafka_op_new (rd_kafka_op_type_t type);
void rd_kafka_op_reply2 (rd_kafka_t *rk, rd_kafka_op_t *rko);
void rd_kafka_op_reply0 (rd_kafka_t *rk, rd_kafka_op_t *rko,
			 rd_kafka_op_type_t type,
			 rd_kafka_resp_err_t err,
			 void *payload, int len);
void rd_kafka_op_reply (rd_kafka_t *rk,
			rd_kafka_op_type_t type,
			rd_kafka_resp_err_t err,
			void *payload, int len);

#define rd_kafka_keep(rk) rd_atomic_add(&(rk)->rk_refcnt, 1)
void rd_kafka_destroy0 (rd_kafka_t *rk);

void rd_kafka_conf_destroy (rd_kafka_conf_t *conf);
void rd_kafka_topic_conf_destroy (rd_kafka_topic_conf_t *topic_conf);

extern int rd_kafka_thread_cnt_curr;

#define RD_KAFKA_SEND_END -1