
/*
 * librdkafka - Apache Kafka C library
 *
 * Copyright (c) 2012-2015, 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.
 */

#include "test.h"

/* Typical include path would be <librdkafka/rdkafka.h>, but this program
 * is built from within the librdkafka source tree and thus differs. */
#include "rdkafka.h"  /* for Kafka driver */


/**
 * Verify that rd_kafka_(query|get)_watermark_offsets() works.
 */


int main_0031_get_offsets (int argc, char **argv) {
	const char *topic = test_mk_topic_name(__FUNCTION__, 1);
        const int msgcnt = 100;
	rd_kafka_t *rk;
	rd_kafka_topic_t *rkt;
	int64_t qry_low = -1234, qry_high = -1235;
	int64_t get_low = -1234, get_high = -1235;
	rd_kafka_resp_err_t err;
	test_timing_t t_qry, t_get;
	uint64_t testid;

        /* Produce messages */
        testid = test_produce_msgs_easy(topic, 0, 0, msgcnt);

	/* Get offsets */
	rk = test_create_consumer(NULL, NULL, NULL, NULL
);

	TIMING_START(&t_qry, "query_watermark_offsets");
	err = rd_kafka_query_watermark_offsets(rk, topic, 0,
					       &qry_low, &qry_high,
                                               tmout_multip(10*1000));
	TIMING_STOP(&t_qry);
	if (err)
		TEST_FAIL("query_watermark_offsets failed: %s\n",
			  rd_kafka_err2str(err));

	if (qry_low != 0 && qry_high != msgcnt)
		TEST_FAIL("Expected low,high %d,%d, but got "
			  "%"PRId64",%"PRId64,
			  0, msgcnt, qry_low, qry_high);

	TEST_SAY("query_watermark_offsets: "
		 "offsets %"PRId64", %"PRId64"\n", qry_low, qry_high);

	/* Now start consuming to update the offset cache, then query it
	 * with the get_ API. */
	rkt = test_create_topic_object(rk, topic, NULL);

	test_consumer_start("get", rkt, 0, RD_KAFKA_OFFSET_BEGINNING);
	test_consume_msgs("get", rkt, testid, 0, TEST_NO_SEEK,
			  0, msgcnt, 0);
	/* After at least one message has been consumed the
	 * watermarks are cached. */

	TIMING_START(&t_get, "get_watermark_offsets");
	err = rd_kafka_get_watermark_offsets(rk, topic, 0,
					     &get_low, &get_high);
	TIMING_STOP(&t_get);
	if (err)
		TEST_FAIL("get_watermark_offsets failed: %s\n",
			  rd_kafka_err2str(err));

	TEST_SAY("get_watermark_offsets: "
		 "offsets %"PRId64", %"PRId64"\n", get_low, get_high);

	if (get_high != qry_high)
		TEST_FAIL("query/get discrepancies: "
			  "low: %"PRId64"/%"PRId64", high: %"PRId64"/%"PRId64,
			  qry_low, get_low, qry_high, get_high);
	if (get_low >= get_high)
		TEST_FAIL("get_watermark_offsets: "
			  "low %"PRId64" >= high %"PRId64,
			  get_low, get_high);

	/* FIXME: We currently dont bother checking the get_low offset
	 *        since it requires stats to be enabled. */

	test_consumer_stop("get", rkt, 0);

	rd_kafka_topic_destroy(rkt);
	rd_kafka_destroy(rk);

        return 0;
}
