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/*
 * librdkafka - Apache Kafka C library
 *
 * Copyright (c) 2017, 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.
 */

/**
 * Simple Apache Kafka producer
 * using the Kafka driver from librdkafka
 * (https://github.com/edenhill/librdkafka)
 */

#include <stdio.h>
#include <signal.h>
#include <string.h>


#include <librdkafka/rdkafka.h>


static volatile sig_atomic_t run = 1;

/**
 * @brief Signal termination of program
 */
static void stop (int sig) {
    run = 0;
    fclose(stdin); /* abort fgets() */
}


/**
 * @brief Message delivery report callback.
 *
 * This callback is called exactly once per message, indicating if
 * the message was succesfully delivered
 * (rkmessage->err == RD_KAFKA_RESP_ERR_NO_ERROR) or permanently
 * failed delivery (rkmessage->err != RD_KAFKA_RESP_ERR_NO_ERROR).
 *
 * The callback is triggered from rd_kafka_poll() and executes on
 * the application's thread.
 */
static void dr_msg_cb (rd_kafka_t *rk,
                       const rd_kafka_message_t *rkmessage, void *opaque) {
    if (rkmessage->err)
        fprintf(stderr, "%% Message delivery failed: %s\\n",
                rd_kafka_err2str(rkmessage->err));
    else
        fprintf(stderr,
                "%% Message delivered (%zd bytes, "
                "partition %"PRId32")\\n",
            rkmessage->len, rkmessage->partition);

    /* The rkmessage is destroyed automatically by librdkafka */
}



int main (int argc, char **argv) {
    rd_kafka_t *rk;         /* Producer instance handle */
    rd_kafka_conf_t *conf;  /* Temporary configuration object */
    char errstr[512];       /* librdkafka API error reporting buffer */
    char buf[512];          /* Message value temporary buffer */
    const char *brokers;    /* Argument: broker list */
    const char *topic;      /* Argument: topic to produce to */
    const char *user;  	    /* Argument: sasl username */
    const char *passwd;     /* Argument: sasl password */

    /*
     * Argument validation
     */
    if (argc < 3) {
        fprintf(stderr, "%% Usage: %s <broker> <topic> <username> <password>  \\n Optional:username password\\n", argv[0]);
        return 1;
    }

    brokers = argv[1];
    topic   = argv[2];

    if(argc == 5) {
        user = argv[3];
        passwd = argv[4];
    }


    /*
     * Create Kafka client configuration place-holder
     */
    conf = rd_kafka_conf_new();

    /* Set bootstrap broker(s) as a comma-separated list of
     * host or host:port (default port 9092).
     * librdkafka will use the bootstrap brokers to acquire the full
     * set of brokers from the cluster. */
    if (rd_kafka_conf_set(conf, "bootstrap.servers", brokers,
                          errstr, sizeof(errstr)) != RD_KAFKA_CONF_OK) {
        fprintf(stderr, "%s\\n", errstr);
        return 1;
    }

    /* Set sasl config*/
    if( user && passwd ) {
        if(rd_kafka_conf_set(conf,"security.protocol","sasl_plaintext",errstr,sizeof(errstr)) !=RD_KAFKA_CONF_OK) {
            fprintf(stderr,"%s\\n",errstr);
            return 1;
        }
        if(rd_kafka_conf_set(conf, "sasl.mechanisms", "PLAIN", errstr, sizeof(errstr)) != RD_KAFKA_CONF_OK) {
            fprintf(stderr,"%s\\n",errstr);
            return 1;
        }
        if(rd_kafka_conf_set(conf,"sasl.username",user,errstr,sizeof(errstr)) !=RD_KAFKA_CONF_OK) {
            fprintf(stderr,"%s\\n",errstr);
            return 1;

        }
        if(rd_kafka_conf_set(conf,"sasl.password",passwd,errstr,sizeof(errstr)) !=RD_KAFKA_CONF_OK) {
            fprintf(stderr,"%s\\n",errstr);
            return 1;
        }

    }
    /* Tencent Cloud recommended configuration parameters
      * https://www.tencentcloud.com/document/product/597/30203?from_cn_redirect=1
      */
    //if(rd_kafka_conf_set(conf,"debug","none",errstr,sizeof(errstr))!= RD_KAFKA_CONF_OK) {  // Note that you need to carefully evaluate whether to enable debugging in the production environment
        //fprintf(stderr,"%s\\n",errstr);
        //return 1;
    //}

    if(rd_kafka_conf_set(conf,"acks","1",errstr,sizeof(errstr)) != RD_KAFKA_CONF_OK) {
        fprintf(stderr,"%s\\n",errstr);
        return 1;
    }
    if(rd_kafka_conf_set(conf,"request.timeout.ms","30000",errstr,sizeof(errstr)) != RD_KAFKA_CONF_OK) {
        fprintf(stderr,"%s\\n",errstr);
        return 1;
    }
    if(rd_kafka_conf_set(conf,"retries","3",errstr,sizeof(errstr)) != RD_KAFKA_CONF_OK) {
        fprintf(stderr,"%s\\n",errstr);
        return 1;
    }

    if(rd_kafka_conf_set(conf,"retry.backoff.ms","1000",errstr,sizeof(errstr)) != RD_KAFKA_CONF_OK) {
        fprintf(stderr,"%s\\n",errstr);
        return 1;
    }

    /* Set the delivery report callback.
     * This callback will be called once per message to inform
     * the application if delivery succeeded or failed.
     * See dr_msg_cb() above.
     * The callback is only triggered from rd_kafka_poll() and
     * rd_kafka_flush(). */
    rd_kafka_conf_set_dr_msg_cb(conf, dr_msg_cb);

    /*
     * Create producer instance.
     *
     * NOTE: rd_kafka_new() takes ownership of the conf object
     *       and the application must not reference it again after
     *       this call.
     */
    rk = rd_kafka_new(RD_KAFKA_PRODUCER, conf, errstr, sizeof(errstr));
    if (!rk) {
        fprintf(stderr,
                "%% Failed to create new producer: %s\\n", errstr);
        return 1;
    }

    /* Signal handler for clean shutdown */
    signal(SIGINT, stop);

    fprintf(stderr,
            "%% Type some text and hit enter to produce message\\n"
            "%% Or just hit enter to only serve delivery reports\\n"
            "%% Press Ctrl-C or Ctrl-D to exit\\n");

    while (run && fgets(buf, sizeof(buf), stdin)) {
        size_t len = strlen(buf);
        rd_kafka_resp_err_t err;

        if (buf[len-1] == '\\n') /* Remove newline */
            buf[--len] = '\\0';

        if (len == 0) {
            /* Empty line: only serve delivery reports */
            rd_kafka_poll(rk, 0/*non-blocking */);
            continue;
        }

        /*
         * Send/Produce message.
         * This is an asynchronous call, on success it will only
         * enqueue the message on the internal producer queue.
         * The actual delivery attempts to the broker are handled
         * by background threads.
         * The previously registered delivery report callback
         * (dr_msg_cb) is used to signal back to the application
         * when the message has been delivered (or failed).
         */
        retry:
        err = rd_kafka_producev(
                /* Producer handle */
                rk,
                /* Topic name */
                RD_KAFKA_V_TOPIC(topic),
                /* Make a copy of the payload. */
                RD_KAFKA_V_MSGFLAGS(RD_KAFKA_MSG_F_COPY),
                /* Message value and length */
                RD_KAFKA_V_VALUE(buf, len),
                /* Per-Message opaque, provided in
                 * delivery report callback as
                 * msg_opaque. */
                RD_KAFKA_V_OPAQUE(NULL),
                /* End sentinel */
                RD_KAFKA_V_END);

        if (err) {
            /*
             * Failed to *enqueue* message for producing.
             */
            fprintf(stderr,
                    "%% Failed to produce to topic %s: %s\\n",
                    topic, rd_kafka_err2str(err));

            if (err == RD_KAFKA_RESP_ERR__QUEUE_FULL) {
                /* If the internal queue is full, wait for
                 * messages to be delivered and then retry.
                 * The internal queue represents both
                 * messages to be sent and messages that have
                 * been sent or failed, awaiting their
                 * delivery report callback to be called.
                 *
                 * The internal queue is limited by the
                 * configuration property
                 * queue.buffering.max.messages */
                rd_kafka_poll(rk, 1000/*block for max 1000ms*/);
                goto retry;
            }
        } else {
            fprintf(stderr, "%% Enqueued message (%zd bytes) "
                            "for topic %s\\n",
                    len, topic);
        }


        /* A producer application should continually serve
         * the delivery report queue by calling rd_kafka_poll()
         * at frequent intervals.
         * Either put the poll call in your main loop, or in a
         * dedicated thread, or call it after every
         * rd_kafka_produce() call.
         * Just make sure that rd_kafka_poll() is still called
         * during periods where you are not producing any messages
         * to make sure previously produced messages have their
         * delivery report callback served (and any other callbacks
         * you register). */
        rd_kafka_poll(rk, 0/*non-blocking*/);
    }


    /* Wait for final messages to be delivered or fail.
     * rd_kafka_flush() is an abstraction over rd_kafka_poll() which
     * waits for all messages to be delivered. */
    fprintf(stderr, "%% Flushing final messages..\\n");
    rd_kafka_flush(rk, 10*1000 /* wait for max 10 seconds */);

    /* If the output queue is still not empty there is an issue
     * with producing messages to the clusters. */
    if (rd_kafka_outq_len(rk) > 0)
        fprintf(stderr, "%% %d message(s) were not delivered\\n",
                rd_kafka_outq_len(rk));

    /* Destroy the producer instance */
    rd_kafka_destroy(rk);

    return 0;
}

gcc -lrdkafka ./producer.c -o producer

./produce <broker> <topic> 

/*
 * librdkafka - Apache Kafka C library
 *
 * Copyright (c) 2019, 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.
 */

/**
 * Simple high-level balanced Apache Kafka consumer
 * using the Kafka driver from librdkafka
 * (https://github.com/edenhill/librdkafka)
 */

#include <stdio.h>
#include <signal.h>
#include <string.h>
#include <ctype.h>


#include <librdkafka/rdkafka.h>


static volatile sig_atomic_t run = 1;

/**
 * @brief Signal termination of program
 */
static void stop (int sig) {
    run = 0;
}



/**
 * @returns 1 if all bytes are printable, else 0.
 */
static int is_printable (const char *buf, size_t size) {
    size_t i;

    for (i = 0 ; i < size ; i++)
        if (!isprint((int)buf[i]))
            return 0;

    return 1;
}


int main (int argc, char **argv) {
    rd_kafka_t *rk;          /* Consumer instance handle */
    rd_kafka_conf_t *conf;   /* Temporary configuration object */
    rd_kafka_resp_err_t err; /* librdkafka API error code */
    char errstr[512];        /* librdkafka API error reporting buffer */
    const char *brokers;     /* Argument: broker list */
    const char *groupid;     /* Argument: Consumer group id */
    char **topics;           /* Argument: list of topics to subscribe to */
    int topic_cnt;           /* Number of topics to subscribe to */
    rd_kafka_topic_partition_list_t *subscription; /* Subscribed topics */
    int i;

    /*
     * Argument validation
     */
    if (argc < 4) {
        fprintf(stderr,
                "%% Usage: "
                "%s <broker> <group.id> <topic1> <topic2>..\\n",
                argv[0]);
        return 1;
    }

    brokers   = argv[1];
    groupid   = argv[2];
    topics    = &argv[3];
    topic_cnt = argc - 3;


    /*
     * Create Kafka client configuration place-holder
     */
    conf = rd_kafka_conf_new();

    /* Set bootstrap broker(s) as a comma-separated list of
     * host or host:port (default port 9092).
     * librdkafka will use the bootstrap brokers to acquire the full
     * set of brokers from the cluster. */
    if (rd_kafka_conf_set(conf, "bootstrap.servers", brokers,
                          errstr, sizeof(errstr)) != RD_KAFKA_CONF_OK) {
        fprintf(stderr, "%s\\n", errstr);
        rd_kafka_conf_destroy(conf);
        return 1;
    }

    /* Set the consumer group id.
     * All consumers sharing the same group id will join the same
     * group, and the subscribed topic' partitions will be assigned
     * according to the partition.assignment.strategy
     * (consumer config property) to the consumers in the group. */
    if (rd_kafka_conf_set(conf, "group.id", groupid,
                          errstr, sizeof(errstr)) != RD_KAFKA_CONF_OK) {
        fprintf(stderr, "%s\\n", errstr);
        rd_kafka_conf_destroy(conf);
        return 1;
    }

    /* If there is no previously committed offset for a partition
     * the auto.offset.reset strategy will be used to decide where
     * in the partition to start fetching messages.
     * By setting this to earliest the consumer will read all messages
     * in the partition if there was no previously committed offset. */
    if (rd_kafka_conf_set(conf, "auto.offset.reset", "earliest",
                          errstr, sizeof(errstr)) != RD_KAFKA_CONF_OK) {
        fprintf(stderr, "%s\\n", errstr);
        rd_kafka_conf_destroy(conf);
        return 1;
    }
    /* Tencent Cloud recommended configuration parameters
      * https://www.tencentcloud.com/document/product/597/30203?from_cn_redirect=1
      */
    if(rd_kafka_conf_set(conf,"debug","all",errstr,sizeof(errstr))!= RD_KAFKA_CONF_OK) {
        fprintf(stderr,"%s\\n",errstr);
        return 1;
    }

    if(rd_kafka_conf_set(conf,"session.timeout.ms","10000",errstr,sizeof(errstr)) != RD_KAFKA_CONF_OK) {
        fprintf(stderr,"%s\\n",errstr);
        return 1;
    }
    if(rd_kafka_conf_set(conf,"heartbeat.interval.ms","3000",errstr,sizeof(errstr)) != RD_KAFKA_CONF_OK) {
        fprintf(stderr,"%s\\n",errstr);
        return 1;
    }

    /*
     * Create consumer instance.
     *
     * NOTE: rd_kafka_new() takes ownership of the conf object
     *       and the application must not reference it again after
     *       this call.
     */
    rk = rd_kafka_new(RD_KAFKA_CONSUMER, conf, errstr, sizeof(errstr));
    if (!rk) {
        fprintf(stderr,
                "%% Failed to create new consumer: %s\\n", errstr);
        return 1;
    }

    conf = NULL; /* Configuration object is now owned, and freed,
                      * by the rd_kafka_t instance. */


    /* Redirect all messages from per-partition queues to
     * the main queue so that messages can be consumed with one
     * call from all assigned partitions.
     *
     * The alternative is to poll the main queue (for events)
     * and each partition queue separately, which requires setting
     * up a rebalance callback and keeping track of the assignment:
     * but that is more complex and typically not recommended. */
    rd_kafka_poll_set_consumer(rk);


    /* Convert the list of topics to a format suitable for librdkafka */
    subscription = rd_kafka_topic_partition_list_new(topic_cnt);
    for (i = 0 ; i < topic_cnt ; i++)
        rd_kafka_topic_partition_list_add(subscription,
                                          topics[i],
                /* the partition is ignored
                 * by subscribe() */
                                          RD_KAFKA_PARTITION_UA);

    /* Subscribe to the list of topics */
    err = rd_kafka_subscribe(rk, subscription);
    if (err) {
        fprintf(stderr,
                "%% Failed to subscribe to %d topics: %s\\n",
                subscription->cnt, rd_kafka_err2str(err));
        rd_kafka_topic_partition_list_destroy(subscription);
        rd_kafka_destroy(rk);
        return 1;
    }

    fprintf(stderr,
            "%% Subscribed to %d topic(s), "
            "waiting for rebalance and messages...\\n",
            subscription->cnt);

    rd_kafka_topic_partition_list_destroy(subscription);


    /* Signal handler for clean shutdown */
    signal(SIGINT, stop);

    /* Subscribing to topics will trigger a group rebalance
     * which may take some time to finish, but there is no need
     * for the application to handle this idle period in a special way
     * since a rebalance may happen at any time.
     * Start polling for messages. */

    while (run) {
        rd_kafka_message_t *rkm;

        rkm = rd_kafka_consumer_poll(rk, 100);
        if (!rkm)
            continue; /* Timeout: no message within 100ms,
                                   *  try again. This short timeout allows
                                   *  checking for `run` at frequent intervals.
                                   */

        /* consumer_poll() will return either a proper message
         * or a consumer error (rkm->err is set). */
        if (rkm->err) {
            /* Consumer errors are generally to be considered
             * informational as the consumer will automatically
             * try to recover from all types of errors. */
            fprintf(stderr,
                    "%% Consumer error: %s\\n",
                    rd_kafka_message_errstr(rkm));
            rd_kafka_message_destroy(rkm);
            continue;
        }

        /* Proper message. */
        printf("Message on %s [%"PRId32"] at offset %"PRId64":\\n",
                rd_kafka_topic_name(rkm->rkt), rkm->partition,
                rkm->offset);

        /* Print the message key. */
        if (rkm->key && is_printable(rkm->key, rkm->key_len))
            printf(" Key: %.*s\\n",
                   (int)rkm->key_len, (const char *)rkm->key);
        else if (rkm->key)
            printf(" Key: (%d bytes)\\n", (int)rkm->key_len);

        /* Print the message value/payload. */
        if (rkm->payload && is_printable(rkm->payload, rkm->len))
            printf(" Value: %.*s\\n",
                   (int)rkm->len, (const char *)rkm->payload);
        else if (rkm->payload)
            printf(" Value: (%d bytes)\\n", (int)rkm->len);

        rd_kafka_message_destroy(rkm);
    }


    /* Close the consumer: commit final offsets and leave the group. */
    fprintf(stderr, "%% Closing consumer\\n");
    rd_kafka_consumer_close(rk);


    /* Destroy the consumer */
    rd_kafka_destroy(rk);

    return 0;
}