base.c

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/*
 *   This program is is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or (at
 *   your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */
 
/**
 * $Id: 1c5b31927d4e569cd934a3f2d567d2a70091105c $
 * @file kafka/base.c
 * @brief Kafka global structures
 *
 * @copyright 2022 Arran Cudbard-Bell (a.cudbardb@freeradius.org)
 */
 
#include <freeradius-devel/kafka/base.h>
#include <freeradius-devel/server/cf_parse.h>
#include <freeradius-devel/server/tmpl.h>
#include <freeradius-devel/util/value.h>
#include <freeradius-devel/util/sbuff.h>
#include <freeradius-devel/util/size.h>
 
typedef struct {
        rd_kafka_conf_t         *conf;
} fr_kafka_conf_t;
 
typedef struct {
        rd_kafka_topic_conf_t   *conf;
} fr_kafka_topic_conf_t;
 
typedef struct {
        fr_table_ptr_sorted_t   *mapping;               //!< Mapping table between string constant.
 
        size_t                  *mapping_len;           //!< Length of the mapping tables
 
        bool                    empty_default;          //!< Don't produce messages saying the default is missing.
 
        size_t                  size_scale;             //!< Divide/multiply FR_TYPE_SIZE by this amount.
 
        char const              *property;              //!< Kafka configuration property.
 
        char const              *string_sep;            //!< Used for multi-value configuration items.
                                                        //!< Kafka uses ', ' or ';' seemingly at random.
} fr_kafka_conf_ctx_t;
 
/** Destroy a kafka configuration handle
 *
 * @param[in] kc        To destroy.
 * @return 0
 */
static int _kafka_conf_free(fr_kafka_conf_t *kc)
{
        rd_kafka_conf_destroy(kc->conf);
        return 0;
}
 
static inline CC_HINT(always_inline)
fr_kafka_conf_t *kafka_conf_from_cs(CONF_SECTION *cs)
{
        CONF_DATA const *cd;
        fr_kafka_conf_t *kc;
 
        cd = cf_data_find(cs, fr_kafka_conf_t, "conf");
        if (cd) {
                kc = cf_data_value(cd);
        } else {
                MEM(kc = talloc(NULL, fr_kafka_conf_t));
                MEM(kc->conf = rd_kafka_conf_new());
                talloc_set_destructor(kc, _kafka_conf_free);
                cf_data_add(cs, kc, "conf", true);
        }
 
        return kc;
}
 
/** Destroy a kafka topic configuration handle
 *
 * @param[in] ktc       To destroy.
 * @return 0
 */
static int _kafka_topic_conf_free(fr_kafka_topic_conf_t *ktc)
{
        rd_kafka_topic_conf_destroy(ktc->conf);
        return 0;
}
 
static inline CC_HINT(always_inline)
fr_kafka_topic_conf_t *kafka_topic_conf_from_cs(CONF_SECTION *cs)
{
        CONF_DATA const         *cd;
        fr_kafka_topic_conf_t   *ktc;
 
        cd = cf_data_find(cs, fr_kafka_topic_conf_t, "conf");
        if (cd) {
                ktc = cf_data_value(cd);
        } else {
                MEM(ktc = talloc(NULL, fr_kafka_topic_conf_t));
                MEM(ktc->conf = rd_kafka_topic_conf_new());
                talloc_set_destructor(ktc, _kafka_topic_conf_free);
                cf_data_add(cs, ktc, "conf", true);
        }
 
        return ktc;
}
 
/** Perform any conversions necessary to map kafka defaults to our values
 *
 * @param[out] out      Where to write the pair.
 * @param[in] parent    being populated.
 * @param[in] cs        to allocate the pair in.
 * @param[in] value     to convert.
 * @param[in] quote     to use when allocing the pair.
 * @param[in] rule      UNUSED.
 * @return
 *      - 0 on success.
 *      - -1 on failure.
 */
static int kafka_config_dflt_single(CONF_PAIR **out, UNUSED void *parent, CONF_SECTION *cs, char const *value,
                                    fr_token_t quote, conf_parser_t const *rule)
{
        char                            tmp[sizeof("18446744073709551615b")];
        fr_kafka_conf_ctx_t const       *kctx = rule->uctx;
        fr_type_t                       type = rule->type;
 
        /*
         *      Apply any mappings available, but default back
         *      to the raw value if we don't have a match.
         */
        if (kctx->mapping) {
                fr_table_ptr_sorted_t   *mapping = kctx->mapping;
                size_t                  mapping_len = *kctx->mapping_len;
 
                value = fr_table_str_by_str_value(mapping, value, value);
        }
        /*
         *      Convert time delta as an integer with ms precision
         */
        switch (type) {
        case FR_TYPE_TIME_DELTA:
        {
                fr_sbuff_t      value_elem = FR_SBUFF_IN(tmp, sizeof(tmp));
                fr_time_delta_t delta;
 
                if (fr_time_delta_from_str(&delta, value, strlen(value), FR_TIME_RES_MSEC) < 0) {
                        cf_log_perr(cs, "Failed parsing default \"%s\"", value);
                        return -1;
                }
 
                fr_time_delta_to_str(&value_elem, delta, FR_TIME_RES_SEC, true);
                value = fr_sbuff_start(&value_elem);
        }
                break;
 
        case FR_TYPE_SIZE:
        {
                fr_sbuff_t      value_elem = FR_SBUFF_IN(tmp, sizeof(tmp));
                size_t          size;
 
                if (fr_size_from_str(&size, &FR_SBUFF_IN(value, strlen(value))) < 0) {
                        cf_log_perr(cs, "Failed parsing default \"%s\"", value);
                        return -1;
                }
 
                /*
                 *      Some options are in kbytes *sigh*
                 */
                if (kctx->size_scale) size *= kctx->size_scale;
 
                /*
                 *      reprint the size with an appropriate unit
                 */
                if (fr_size_to_str(&value_elem, size) < 0) {
                        cf_log_perr(cs, "Failed size reprint");
                        return -1;
                }
                value = fr_sbuff_start(&value_elem);
        }
                break;
 
        default:
                break;
        }
 
        MEM(*out = cf_pair_alloc(cs, rule->name1, value, T_OP_EQ, T_BARE_WORD, quote));
        cf_pair_mark_parsed(*out);      /* Don't re-parse this */
 
        return 0;
}
 
/** Return the default value from the kafka client library
 *
 * @param[out] out      Where to write the pair.
 * @param[in] parent    being populated.
 * @param[in] cs        to allocate the pair in.
 * @param[in] quote     to use when allocing the pair.
 * @param[in] rule      UNUSED.
 * @return
 *      - 0 on success.
 *      - -1 on failure.
 */
static int kafka_config_dflt(CONF_PAIR **out, void *parent, CONF_SECTION *cs, fr_token_t quote, conf_parser_t const *rule)
{
        char                            buff[1024];
        size_t                          buff_len = sizeof(buff);
        char const                      *value;
 
        fr_kafka_conf_t                 *kc;
        fr_kafka_conf_ctx_t const       *kctx = rule->uctx;
        rd_kafka_conf_res_t             ret;
 
        kc = kafka_conf_from_cs(cs);
        fr_assert(kc);
 
        if ((ret = rd_kafka_conf_get(kc->conf, kctx->property, buff, &buff_len)) != RD_KAFKA_CONF_OK) {
                if (ret == RD_KAFKA_CONF_UNKNOWN) {
                        if (kctx->empty_default) return 0;
 
                        cf_log_debug(cs, "No default available for \"%s\" - \"%s\"", rule->name1, kctx->property);
                        return 0;       /* Not an error */
                }
 
                cf_log_err(cs, "Failed retrieving kafka property \"%s\"", kctx->property);
                return -1;
        }
#if 0
        cf_log_debug(cs, "Retrieved dflt \"%s\" for \"%s\" - \"%s\"", buff, rule->name1, kctx->property);
#endif
        value = buff;
 
        /*
         *      If it's multi we need to break the string apart on the string separator
         *      and potentially unescape the separator.
         */
        if (fr_rule_multi(rule)) {
                fr_sbuff_t                      value_in = FR_SBUFF_IN(value, buff_len);
                char                            tmp[256];
                fr_sbuff_t                      value_elem = FR_SBUFF_OUT(tmp, sizeof(tmp));
                fr_sbuff_term_t                 tt = FR_SBUFF_TERM(kctx->string_sep);
                fr_sbuff_unescape_rules_t       ue_rules = {
                                                        .name = __FUNCTION__,
                                                        .chr = '\\'
                                                };
                /*
                 *      Convert escaped separators back
                 */
                ue_rules.subs[(uint8_t)kctx->string_sep[0]] = kctx->string_sep[0];
 
                while (fr_sbuff_out_unescape_until(&value_elem, &value_in, SIZE_MAX, &tt, &ue_rules) > 0) {
                        if (kafka_config_dflt_single(out, parent, cs, fr_sbuff_start(&value_elem), quote, rule) < 0) return -1;
 
                        /*
                         *      Skip past the string separator
                         */
                        fr_sbuff_advance(&value_in, strlen(kctx->string_sep));
 
                        /*
                         *      Reset
                         */
                        fr_sbuff_set_to_start(&value_elem);
                }
                return 0;
        }
 
        /*
         *      Parse a single value
         */
        if (kafka_config_dflt_single(out, parent, cs, value, quote, rule) < 0) return -1;
 
        return 0;
}
 
/** Return the default value for a topic from the kafka client library
 *
 * @param[out] out      Where to write the pair.
 * @param[in] parent    being populated.
 * @param[in] cs        to allocate the pair in.
 * @param[in] quote     to use when allocing the pair.
 * @param[in] rule      UNUSED.
 * @return
 *      - 0 on success.
 *      - -1 on failure.
 */
static int kafka_topic_config_dflt(CONF_PAIR **out, void *parent, CONF_SECTION *cs, fr_token_t quote, conf_parser_t const *rule)
{
        char                            buff[1024];
        size_t                          buff_len = sizeof(buff);
        char const                      *value;
 
        fr_kafka_topic_conf_t           *ktc;
        fr_kafka_conf_ctx_t const       *kctx = rule->uctx;
        rd_kafka_conf_res_t             ret;
 
        ktc = kafka_topic_conf_from_cs(cs);
        fr_assert(ktc);
 
        if ((ret = rd_kafka_topic_conf_get(ktc->conf, kctx->property, buff, &buff_len)) != RD_KAFKA_CONF_OK) {
                if (ret == RD_KAFKA_CONF_UNKNOWN) {
                        if (kctx->empty_default) return 0;
 
                        cf_log_debug(cs, "No default available for \"%s\" - \"%s\"", rule->name1, kctx->property);
                        return 0;       /* Not an error */
                }
 
                fr_assert(ret == RD_KAFKA_CONF_UNKNOWN);
                cf_log_err(cs, "Failed retrieving kafka property '%s'", kctx->property);
                return -1;
        }
#if 0
        cf_log_debug(cs, "Retrieved dflt \"%s\" for \"%s\" - \"%s\"", buff, rule->name1, kctx->property);
#endif
        value = buff;
 
        /*
         *      Parse a single value
         */
        if (kafka_config_dflt_single(out, parent, cs, value, quote, rule) < 0) return -1;
 
        return 0;
}
 
static int kafka_config_parse_single(char const **out, CONF_PAIR *cp, conf_parser_t const *rule)
{
        fr_value_box_t                  vb = FR_VALUE_BOX_INITIALISER_NULL(vb);
        fr_kafka_conf_ctx_t const       *kctx = rule->uctx;
        fr_type_t                       type = rule->type;
        static _Thread_local char       buff[sizeof("18446744073709551615")];
        static _Thread_local fr_sbuff_t sbuff;
 
        /*
         *      Map string values if possible, and if there's
         *      no match then just pass the original through.
         *
         *      We count this as validation...
         */
        if (kctx->mapping) {
                fr_table_ptr_sorted_t   *mapping = kctx->mapping;
                size_t                  mapping_len = *kctx->mapping_len;
 
                *out = fr_table_value_by_str(mapping, cf_pair_value(cp), cf_pair_value(cp));
                return 0;
        } else if (fr_type_is_string(type)) {
                *out = cf_pair_value(cp);
                return 0;
        }
 
        /*
         *      Parse as a box for basic validation
         */
        if (cf_pair_to_value_box(NULL, &vb, cp, rule) < 0) return -1;
 
        /*
         *      In kafka all the time deltas are in ms
         *      resolution, so we need to take the parsed value,
         *      scale it, and print it back to a string.
         */
        switch (type) {
        case FR_TYPE_TIME_DELTA:
        {
                uint64_t                        delta;
 
                sbuff = FR_SBUFF_IN(buff, sizeof(buff));
                delta = fr_time_delta_to_msec(vb.vb_time_delta);
                if (fr_sbuff_in_sprintf(&sbuff, "%" PRIu64, delta) < 0) {
                error:
                        fr_value_box_clear(&vb);
                        return -1;
                }
                *out = fr_sbuff_start(&sbuff);
        }
                break;
 
        case FR_TYPE_SIZE:
        {
                size_t size = vb.vb_size;
 
                sbuff = FR_SBUFF_IN(buff, sizeof(buff));
 
                /*
                 *      Most options are in bytes, but some are in kilobytes
                 */
                if (kctx->size_scale) size /= kctx->size_scale;
 
                /*
                 *      Kafka doesn't want units...
                 */
                if (fr_sbuff_in_sprintf(&sbuff, "%zu", size) < 0) goto error;
                *out = fr_sbuff_start(&sbuff);
        }
                break;
 
        /*
         *      Ensure bool is always mapped to the string constants
         *      "true" or "false".
         */
        case FR_TYPE_BOOL:
                *out = vb.vb_bool ? "true" : "false";
                break;
 
        default:
                *out = cf_pair_value(cp);
                break;
        }
 
        fr_value_box_clear(&vb);
 
        return 0;
}
 
/** Translate config items directly to settings in a kafka config struct
 *
 * @param[in] ctx       to allocate fr_kafka_conf_t in.
 * @param[out] out      Unused.
 * @param[in] base      Unused.
 * @param[in] ci        To parse.
 * @param[in] rule      describing how to parse the item.
 * @return
 *      - 0 on success.
 *      - -1 on failure
 */
static int kafka_config_parse(TALLOC_CTX *ctx, UNUSED void *out, UNUSED void *base,
                              CONF_ITEM *ci, conf_parser_t const *rule)
{
        fr_kafka_conf_ctx_t const       *kctx = rule->uctx;
        CONF_ITEM                       *parent = cf_parent(ci);
        CONF_SECTION                    *cs = cf_item_to_section(parent);
        CONF_PAIR                       *cp = cf_item_to_pair(ci);
 
        fr_kafka_conf_t                 *kc;
        char const                      *value;
 
        kc = kafka_conf_from_cs(cf_item_to_section(parent));
 
        /*
         *      Multi rules require us to concat the values together before handing them off
         */
        if (fr_rule_multi(rule)) {
                unsigned int    i;
                CONF_PAIR       *cp_p;
                size_t          count;
                char const      **array;
                fr_sbuff_t      *agg;
                fr_slen_t       slen;
 
                FR_SBUFF_TALLOC_THREAD_LOCAL(&agg, 256, SIZE_MAX);
 
                count = cf_pair_count(cs,  rule->name1);
                if (count <= 1) goto do_single;
 
                MEM(array = talloc_array(ctx, char const *, count));
                for (cp_p = cp, i = 0;
                     cp_p;
                     cp_p = cf_pair_find_next(cs, cp_p, rule->name1), i++) {
                        if (kafka_config_parse_single(&array[i], cp_p, rule) < 0) return -1;
                        cf_pair_mark_parsed(cp_p);
                }
 
                slen = talloc_array_concat(agg, array, kctx->string_sep);
                talloc_free(array);
                if (slen < 0) return -1;
 
                value = fr_sbuff_start(agg);
        } else {
        do_single:
                if (kafka_config_parse_single(&value, cp, rule) < 0) return -1;
        }
 
        {
                char errstr[512];
 
                if (rd_kafka_conf_set(kc->conf, kctx->property,
                                      value, errstr, sizeof(errstr)) != RD_KAFKA_CONF_OK) {
                        cf_log_perr(cp, "%s", errstr);
                        return -1;
                }
        }
 
        return 0;
}
 
 
/** Translate config items directly to settings in a kafka topic config struct
 *
 * @param[in] ctx       to allocate fr_kafka_conf_t in.
 * @param[out] out      Unused.
 * @param[in] base      Unused.
 * @param[in] ci        To parse.
 * @param[in] rule      describing how to parse the item.
 * @return
 *      - 0 on success.
 *      - -1 on failure
 */
static int kafka_topic_config_parse(UNUSED TALLOC_CTX *ctx, UNUSED void *out, UNUSED void *base,
                                    CONF_ITEM *ci, conf_parser_t const *rule)
{
        fr_kafka_conf_ctx_t const       *kctx = rule->uctx;
        CONF_ITEM                       *parent = cf_parent(ci);
        CONF_PAIR                       *cp = cf_item_to_pair(ci);
 
        fr_kafka_topic_conf_t           *ktc;
        char const                      *value;
 
        ktc = kafka_topic_conf_from_cs(cf_item_to_section(parent));
        if (kafka_config_parse_single(&value, cp, rule) < 0) return -1;
 
        {
                char errstr[512];
 
                if (rd_kafka_topic_conf_set(ktc->conf, kctx->property,
                                            value, errstr, sizeof(errstr)) != RD_KAFKA_CONF_OK) {
                        cf_log_perr(cp, "%s", errstr);
                        return -1;
                }
        }
 
        return 0;
}
 
#if 0
/** Configure a new topic for production or consumption
 *
 */
static int kafka_topic_new(UNUSED TALLOC_CTX *ctx, UNUSED void *out, UNUSED void *base,
                           CONF_ITEM *ci, conf_parser_t const *rule)
{
        fr_kafka_conf_ctx_t const       *kctx = rule->uctx;
        CONF_ITEM                       *parent = cf_parent(ci);
        CONF_PAIR                       *cp = cf_item_to_pair(ci);
 
        fr_kafka_topic_conf_t           *ktc;
        char const                      *value;
 
        ktc = kafka_topic_conf_from_cs(cf_item_to_section(parent));
 
        rd_kafka_topic_new (rd_kafka_t *rk, const char *topic, rd_kafka_topic_conf_t *conf)
}
#endif
 
static conf_parser_t const kafka_sasl_oauth_config[] = {
        { FR_CONF_FUNC("oauthbearer_conf", FR_TYPE_STRING, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "sasl.oauthbearer.config", .empty_default = true }},
 
        { FR_CONF_FUNC("unsecure_jwt", FR_TYPE_BOOL, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "enable.sasl.oauthbearer.unsecure.jwt" }},
 
        CONF_PARSER_TERMINATOR
};
 
static conf_parser_t const kafka_sasl_kerberos_config[] = {
        /*
         *      Service principal
         */
        { FR_CONF_FUNC("service_name", FR_TYPE_STRING, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "sasl.kerberos.service.name" }},
 
        /*
         *      Principal
         */
        { FR_CONF_FUNC("principal", FR_TYPE_STRING, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "sasl.kerberos.principal" }},
 
        /*
         *      knit cmd
         */
        { FR_CONF_FUNC("kinit_cmd", FR_TYPE_STRING, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "sasl.kerberos.kinit.cmd" }},
 
        /*
         *      keytab
         */
        { FR_CONF_FUNC("keytab", FR_TYPE_STRING, CONF_FLAG_FILE_INPUT, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "sasl.kerberos.kinit.keytab", .empty_default = true }},
 
        /*
         *      How long between key refreshes
         */
        { FR_CONF_FUNC("refresh_delay", FR_TYPE_TIME_DELTA, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "sasl.kerberos.min.time.before.relogin" }},
 
        CONF_PARSER_TERMINATOR
};
 
static conf_parser_t const kafka_sasl_config[] = {
        /*
         *      SASL mechanism
         */
        { FR_CONF_FUNC("mech", FR_TYPE_STRING, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "sasl.mechanism" }},
 
        /*
         *      Static SASL username
         */
        { FR_CONF_FUNC("username", FR_TYPE_STRING, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "sasl.username", .empty_default = true }},
 
        /*
         *      Static SASL password
         */
        { FR_CONF_FUNC("password", FR_TYPE_STRING, CONF_FLAG_SECRET, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "sasl.password", .empty_default = true }},
 
        { FR_CONF_SUBSECTION_GLOBAL("kerberos", 0, kafka_sasl_kerberos_config) },
 
        { FR_CONF_SUBSECTION_GLOBAL("oauth", 0, kafka_sasl_oauth_config) },
 
        CONF_PARSER_TERMINATOR
};
 
static fr_table_ptr_sorted_t kafka_check_cert_cn_table[] = {
        { L("false"),   "none"  },
        { L("no"),      "none"  },
        { L("true"),    "https" },
        { L("yes"),     "https" }
};
static size_t kafka_check_cert_cn_table_len = NUM_ELEMENTS(kafka_check_cert_cn_table);
 
static conf_parser_t const kafka_tls_config[] = {
        /*
         *      Cipher suite list in OpenSSL's format
         */
        { FR_CONF_FUNC("cipher_list", FR_TYPE_STRING, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "ssl.cipher.suites", .empty_default = true }},
 
        /*
         *      Curves list in OpenSSL's format
         */
        { FR_CONF_FUNC("curve_list", FR_TYPE_STRING, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "ssl.curves.list", .empty_default = true }},
 
        /*
         *      Curves list in OpenSSL's format
         */
        { FR_CONF_FUNC("sigalg_list", FR_TYPE_STRING, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "ssl.sigalgs.list", .empty_default = true }},
 
        /*
         *      Sets the full path to a CA certificate (used to validate
         *      the certificate the server presents).
         */
        { FR_CONF_FUNC("ca_file", FR_TYPE_STRING, CONF_FLAG_FILE_INPUT, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "ssl.ca.location", .empty_default = true }},
 
        /*
         *      Location of the CRL file.
         */
        { FR_CONF_FUNC("crl_file", FR_TYPE_STRING, CONF_FLAG_FILE_INPUT, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "ssl.crl.location", .empty_default = true }},
 
        /*
         *      Sets the path to the public certificate file we present
         *      to the servers.
         */
        { FR_CONF_FUNC("certificate_file", FR_TYPE_STRING, CONF_FLAG_FILE_INPUT, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "ssl.certificate.location", .empty_default = true }},
 
        /*
         *      Sets the path to the private key for our public
         *      certificate.
         */
        { FR_CONF_FUNC("private_key_file", FR_TYPE_STRING, CONF_FLAG_FILE_INPUT, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "ssl.key.location", .empty_default = true }},
 
        /*
         *      Enable or disable certificate validation
         */
        { FR_CONF_FUNC("require_cert", FR_TYPE_BOOL, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "enable.ssl.certificate.verification" }},
 
        { FR_CONF_FUNC("check_cert_cn", FR_TYPE_BOOL, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "ssl.endpoint.identification.algorithm",
                                          .mapping = kafka_check_cert_cn_table,
                                          .mapping_len = &kafka_check_cert_cn_table_len }},
        CONF_PARSER_TERMINATOR
};
 
static conf_parser_t const kafka_connection_config[] = {
        /*
         *      Socket timeout
         */
        { FR_CONF_FUNC("timeout", FR_TYPE_TIME_DELTA, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "socket.timeout.ms" }},
 
        /*
         *      Close broker connections after this period.
         */
        { FR_CONF_FUNC("idle_timeout", FR_TYPE_TIME_DELTA, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "connections.max.idle.ms" }},
 
        /*
         *      Maximum requests in flight (per connection).
         */
        { FR_CONF_FUNC("max_requests_in_flight", FR_TYPE_UINT64, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "max.in.flight.requests.per.connection" }},
 
        /*
         *      Socket send buffer.
         */
        { FR_CONF_FUNC("send_buff", FR_TYPE_UINT64, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "socket.send.buffer.bytes" }},
 
        /*
         *      Socket recv buffer.
         */
        { FR_CONF_FUNC("recv_buff", FR_TYPE_UINT64, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "socket.receive.buffer.bytes" }},
 
        /*
         *      If true, send TCP keepalives
         */
        { FR_CONF_FUNC("keepalive", FR_TYPE_BOOL, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "socket.keepalive.enable" }},
 
        /*
         *      If true, disable nagle algorithm
         */
        { FR_CONF_FUNC("nodelay", FR_TYPE_BOOL, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "socket.nagle.disable" }},
 
        /*
         *      How long the DNS resolver cache is valid for
         */
        { FR_CONF_FUNC("resolver_cache_ttl", FR_TYPE_TIME_DELTA, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "broker.address.ttl" }},
 
        /*
         *      Should we use A records, AAAA records or either
         *      when resolving broker addresses
         */
        { FR_CONF_FUNC("resolver_addr_family", FR_TYPE_STRING, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "broker.address.family" }},
 
        /*
         *      How many failures before we reconnect the connection
         */
        { FR_CONF_FUNC("reconnection_failure_count", FR_TYPE_UINT32, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "socket.max.fails" }},
 
        /*
         *      Initial time to wait before reconnecting.
         */
        { FR_CONF_FUNC("reconnection_delay_initial", FR_TYPE_TIME_DELTA, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "reconnect.backoff.ms" }},
 
        /*
         *      Max time to wait before reconnecting.
         */
        { FR_CONF_FUNC("reconnection_delay_max", FR_TYPE_TIME_DELTA, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "reconnect.backoff.max.ms" }},
 
        CONF_PARSER_TERMINATOR
};
 
static conf_parser_t const kafka_version_config[] = {
        /*
         *      Request the API version from connected brokers
         */
        { FR_CONF_FUNC("request", FR_TYPE_BOOL, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "api.version.request" }},
 
        /*
         *      How long to wait for a version response.
         */
        { FR_CONF_FUNC("timeout", FR_TYPE_TIME_DELTA, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "api.version.request.timeout.ms" }},
 
        /*
         *      How long to wait before retrying a version request.
         */
        { FR_CONF_FUNC("retry_delay", FR_TYPE_TIME_DELTA, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "api.version.fallback.ms" }},
 
        /*
         *      Default version to use if the version request fails.
         */
        { FR_CONF_FUNC("default", FR_TYPE_STRING, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "broker.version.fallback" }},
 
        CONF_PARSER_TERMINATOR
};
 
static conf_parser_t const kafka_metadata_config[] = {
        /*
         *      Interval between attempts to refresh metadata from brokers
         */
        { FR_CONF_FUNC("refresh_interval", FR_TYPE_TIME_DELTA, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "topic.metadata.refresh.interval.ms" }},
 
        /*
         *      Interval between attempts to refresh metadata from brokers
         */
        { FR_CONF_FUNC("max_age", FR_TYPE_TIME_DELTA, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "metadata.max.age.ms" }},
 
        /*
         *       Used when a topic loses its leader
         */
        { FR_CONF_FUNC("fast_refresh_interval", FR_TYPE_TIME_DELTA, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "topic.metadata.refresh.fast.interval.ms" }},
 
        /*
         *       Used when a topic loses its leader to prevent spurious metadata changes
         */
        { FR_CONF_FUNC("max_propagation", FR_TYPE_TIME_DELTA, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "topic.metadata.propagation.max.ms" }},
 
        /*
         *      Use sparse metadata requests which use less bandwidth maps
         */
        { FR_CONF_FUNC("refresh_sparse", FR_TYPE_BOOL, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "topic.metadata.refresh.sparse" }},
 
        /*
         *      List of topics to ignore
         */
        { FR_CONF_FUNC("blacklist", FR_TYPE_STRING, CONF_FLAG_MULTI, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "topic.blacklist", .string_sep = ",", .empty_default = true }},
 
        CONF_PARSER_TERMINATOR
};
 
#define BASE_CONFIG \
        { FR_CONF_FUNC("server", FR_TYPE_STRING, CONF_FLAG_REQUIRED | CONF_FLAG_MULTI, kafka_config_parse, kafka_config_dflt), \
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "metadata.broker.list", .string_sep = "," }}, \
        { FR_CONF_FUNC("client_id", FR_TYPE_STRING, 0, kafka_config_parse, kafka_config_dflt), \
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "client.id" }}, \
        { FR_CONF_FUNC("rack_id", FR_TYPE_STRING, 0, kafka_config_parse, kafka_config_dflt), \
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "client.rack" }}, \
        { FR_CONF_FUNC("request_max_size", FR_TYPE_SIZE, 0, kafka_config_parse, kafka_config_dflt), \
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "message.max.bytes" }}, \
        { FR_CONF_FUNC("request_copy_max_size", FR_TYPE_SIZE, 0, kafka_config_parse, kafka_config_dflt), \
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "message.copy.max.bytes" }}, \
        { FR_CONF_FUNC("response_max_size", FR_TYPE_SIZE, 0, kafka_config_parse, kafka_config_dflt), \
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "receive.message.max.bytes" }}, \
        { FR_CONF_FUNC("feature", FR_TYPE_STRING, CONF_FLAG_MULTI, kafka_config_parse, kafka_config_dflt), \
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "builtin.features", .string_sep = "," }}, \
        { FR_CONF_FUNC("debug", FR_TYPE_STRING, CONF_FLAG_MULTI, kafka_config_parse, kafka_config_dflt), \
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "debug", .string_sep = "," }}, \
        { FR_CONF_FUNC("plugin", FR_TYPE_STRING, CONF_FLAG_MULTI, kafka_config_parse, NULL), \
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "plugin.library.paths", .string_sep = ";" }}, \
        { FR_CONF_SUBSECTION_GLOBAL("metadata", 0, kafka_metadata_config) }, \
        { FR_CONF_SUBSECTION_GLOBAL("version", 0, kafka_version_config) }, \
        { FR_CONF_SUBSECTION_GLOBAL("connection", 0, kafka_connection_config) }, \
        { FR_CONF_SUBSECTION_GLOBAL("tls", 0, kafka_tls_config) }, \
        { FR_CONF_SUBSECTION_GLOBAL("sasl", 0, kafka_sasl_config) }
 
static conf_parser_t const kafka_consumer_group_config[] = {
        /*
         *      Group consumer is a member of
         */
        { FR_CONF_FUNC("id", FR_TYPE_STRING, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "group.id" }},
 
        /*
         *      A unique identifier of the consumer instance provided by the end user
         */
        { FR_CONF_FUNC("instance_id", FR_TYPE_STRING, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "group.instance.id" }},
 
        /*
         *      Range or roundrobin
         */
        { FR_CONF_FUNC("partition_assignment_strategy", FR_TYPE_STRING, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "partition.assignment.strategy" }},
 
        /*
         *      Client group session and failure detection timeout.
         */
        { FR_CONF_FUNC("session_timeout", FR_TYPE_TIME_DELTA, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "session.timeout.ms" }},
 
        /*
         *      Group session keepalive heartbeat interval.
         */
        { FR_CONF_FUNC("heartbeat_interval", FR_TYPE_TIME_DELTA, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "heartbeat.interval.ms" }},
 
        /*
         *      How often to query for the current client group coordinator
         */
        { FR_CONF_FUNC("coordinator_query_interval", FR_TYPE_TIME_DELTA, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "coordinator.query.interval.ms" }},
 
 
        CONF_PARSER_TERMINATOR
};
 
static conf_parser_t const kafka_base_consumer_topic_config[] = {
        /*
         *      How many messages we process at a time
         *
         *      High numbers may starve the worker thread
         */
        { FR_CONF_FUNC("max_messages_per_cycle", FR_TYPE_UINT32, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "consume.callback.max.messages" }},
 
        /*
         *      Action to take when there is no initial offset
         *      in offset store or the desired offset is out of range.
         */
        { FR_CONF_FUNC("auto_offset_reset", FR_TYPE_STRING, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "auto.offset.reset" }},
 
        CONF_PARSER_TERMINATOR
};
 
/*
 * Allows topic configurations in the format:
 *
 * topic {
 *   <name> {
 *     request_required_acks = ...
 *   }
 * }
 *
 */
static conf_parser_t const kafka_base_consumer_topics_config[] = {
        { FR_CONF_SUBSECTION_GLOBAL(CF_IDENT_ANY, CONF_FLAG_MULTI, kafka_base_consumer_topic_config) },
 
        CONF_PARSER_TERMINATOR
};
 
conf_parser_t const kafka_base_consumer_config[] = {
        BASE_CONFIG,
        { FR_CONF_SUBSECTION_GLOBAL("group", 0, kafka_consumer_group_config) },
 
        /*
         *      Maximum allowed time between calls to consume messages.
         */
        { FR_CONF_FUNC("max_poll_interval", FR_TYPE_TIME_DELTA, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "max.poll.interval.ms" }},
 
        /*
         *      Toggle auto commit
         */
        { FR_CONF_FUNC("auto_commit", FR_TYPE_BOOL, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "enable_auto.commit" }},
 
        /*
         *      Auto commit interval
         */
        { FR_CONF_FUNC("auto_commit_interval", FR_TYPE_TIME_DELTA, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "auto.commit.interval.ms" }},
 
        /*
         *      Automatically store offset of last message provided to application.
         */
        { FR_CONF_FUNC("auto_offset_store", FR_TYPE_BOOL, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "enable.auto.offset.store" }},
 
        /*
         *      Minimum number of messages per topic+partition librdkafka tries to
         *      maintain in the local consumer queue.
         */
        { FR_CONF_FUNC("queued_messages_min", FR_TYPE_UINT64, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "queued.min.messages" }},
 
        /*
         *      Maximum size of queued pre-fetched messages in the local consumer queue.
         */
        { FR_CONF_FUNC("queued_messages_max_size", FR_TYPE_SIZE, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "queued.max.messages.kbytes", .size_scale = 1024 }},
 
        /*
         *       Maximum time the broker may wait to fill the Fetch response.
         */
        { FR_CONF_FUNC("fetch_wait_max", FR_TYPE_TIME_DELTA, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "fetch.wait.max.ms" }},
 
        /*
         *      Initial maximum number of bytes per topic+partition to request when
         *      fetching messages from the broker.
         */
        { FR_CONF_FUNC("fetch_message_max_size", FR_TYPE_SIZE, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "fetch.message.max.bytes" }},
 
        /*
         *      Initial maximum number of bytes per topic+partition to request when
         *      fetching messages from the broker.
         */
        { FR_CONF_FUNC("fetch_partition_max_size", FR_TYPE_SIZE, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "max.partition.fetch.bytes" }},
 
        /*
         *      Maximum amount of data the broker shall return for a Fetch request.
         */
        { FR_CONF_FUNC("fetch_max_size", FR_TYPE_SIZE, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "fetch.max.bytes" }},
 
        /*
         *       Minimum number of bytes the broker responds with.
         */
        { FR_CONF_FUNC("fetch_min_size", FR_TYPE_SIZE, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "fetch.min.bytes" }},
 
        /*
         *      How long to postpone the next fetch request for a topic+partition
         *      in case of a fetch error.
         */
        { FR_CONF_FUNC("fetch_error_backoff", FR_TYPE_TIME_DELTA, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "fetch.error.backoff.ms" }},
 
        /*
         *      Controls how to read messages written transactionally
         */
        { FR_CONF_FUNC("isolation_level", FR_TYPE_STRING, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "isolation.level" }},
 
        /*
         *      Verify CRC32 of consumed messages, ensuring no on-the-wire or
         *      on-disk corruption to the messages occurred.
         */
        { FR_CONF_FUNC("check_crcs", FR_TYPE_BOOL, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "check.crcs" }},
 
        /*
         *      Allow automatic topic creation on the broker when subscribing
         *      to or assigning non-existent topics
         */
        { FR_CONF_FUNC("auto_create_topic", FR_TYPE_BOOL, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "allow.auto.create.topics" }},
 
        { FR_CONF_SUBSECTION_GLOBAL("topic", 0, kafka_base_consumer_topics_config) }, \
 
        CONF_PARSER_TERMINATOR
};
 
static conf_parser_t const kafka_base_producer_topic_config[] = {
        /*
         *      This field indicates the number of acknowledgements the leader
         *      broker must receive from ISR brokers before responding to the request.
         */
        { FR_CONF_FUNC("request_required_acks", FR_TYPE_INT16, 0, kafka_topic_config_parse, kafka_topic_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "request.required.acks" }},
 
        /*
         *      medium  The ack timeout of the producer request in milliseconds
         */
        { FR_CONF_FUNC("request_timeout", FR_TYPE_TIME_DELTA, 0, kafka_topic_config_parse, kafka_topic_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "request.timeout.ms" }},
 
        /*
         *      Local message timeout
         */
        { FR_CONF_FUNC("message_timeout", FR_TYPE_TIME_DELTA, 0, kafka_topic_config_parse, kafka_topic_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "message.timeout.ms" }},
 
        /*
         *      Partitioning strategy
         */
        { FR_CONF_FUNC("partitioner", FR_TYPE_STRING, 0, kafka_topic_config_parse, kafka_topic_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "partitioner" }},
 
        /*
         *      compression codec to use for compressing message sets.
         */
        { FR_CONF_FUNC("compression_type", FR_TYPE_STRING, 0, kafka_topic_config_parse, kafka_topic_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "compression.type" }},
 
        /*
         *      compression level to use
         */
        { FR_CONF_FUNC("compression_level", FR_TYPE_INT8, 0, kafka_topic_config_parse, kafka_topic_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "compression.level" }},
 
        CONF_PARSER_TERMINATOR
};
 
/*
 * Allows topic configurations in the format:
 *
 * topic {
 *   <name> {
 *     request_required_acks = ...
 *   }
 * }
 *
 */
static conf_parser_t const kafka_base_producer_topics_config[] = {
        { FR_CONF_SUBSECTION_GLOBAL(CF_IDENT_ANY, 0, kafka_base_producer_topic_config) },
 
        CONF_PARSER_TERMINATOR
};
 
conf_parser_t const kafka_base_producer_config[] = {
        BASE_CONFIG,
 
        /*
         *      Enables the transactional producer
         */
        { FR_CONF_FUNC("transactional_id", FR_TYPE_STRING, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "transactional.id", .empty_default = true }},
 
        /*
         *      The maximum amount of time in milliseconds that the transaction
         *      coordinator will wait for a transaction status update from the
         *      producer before proactively aborting the ongoing transaction.
         */
        { FR_CONF_FUNC("transaction_timeout", FR_TYPE_TIME_DELTA, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "transaction.timeout.ms" }},
 
        /*
         *      When set to true, the producer will ensure that messages are
         *      successfully produced exactly once and in the original produce
         *      order.
         */
        { FR_CONF_FUNC("idempotence", FR_TYPE_BOOL, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "enable.idempotence" }},
 
        /*
         *      When set to true, any error that could result in a gap in the
         *      produced message series when a batch of messages fails.
         */
        { FR_CONF_FUNC("gapless_guarantee", FR_TYPE_BOOL, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "enable.gapless.guarantee" }},
 
        /*
         *      Maximum number of messages allowed on the producer queue.
         *      This queue is shared by all topics and partitions.
         */
        { FR_CONF_FUNC("queue_max_messages", FR_TYPE_UINT32, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "queue.buffering.max.messages" }},
 
        /*
         *      Maximum total message size sum allowed on the producer queue.
         */
        { FR_CONF_FUNC("queue_max_size", FR_TYPE_SIZE, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "queue.buffering.max.kbytes", .size_scale = 1024 }},
 
        /*
         *      How long we wait to aggregate messages
         */
        { FR_CONF_FUNC("queue_max_delay", FR_TYPE_TIME_DELTA, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "queue.buffering.max.ms" }},
 
        /*
         *      How many times we resend a message
         */
        { FR_CONF_FUNC("message_retry_max", FR_TYPE_UINT32, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "message.send.max.retries" }},
 
        /*
         *      The backoff time in milliseconds before retrying a protocol request.
         */
        { FR_CONF_FUNC("message_retry_interval", FR_TYPE_TIME_DELTA, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "retry.backoff.ms" }},
 
        /*
         *      The threshold of outstanding not yet transmitted broker requests
         *      needed to backpressure the producer's message accumulator.
         */
        { FR_CONF_FUNC("backpressure_threshold", FR_TYPE_UINT32, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "queue.buffering.backpressure.threshold" }},
 
        /*
         *      compression codec to use for compressing message sets.
         */
        { FR_CONF_FUNC("compression_type", FR_TYPE_STRING, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "compression.type" }},
 
        /*
         *      Maximum size (in bytes) of all messages batched in one MessageSet
         */
        { FR_CONF_FUNC("batch_size", FR_TYPE_SIZE, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "batch.size" }},
 
        /*
         *      Delay in milliseconds to wait to assign new sticky partitions for each topic
         */
        { FR_CONF_FUNC("sticky_partition_delay", FR_TYPE_TIME_DELTA, 0, kafka_config_parse, kafka_config_dflt),
          .uctx = &(fr_kafka_conf_ctx_t){ .property = "sticky.partitioning.linger.ms" }},
 
        { FR_CONF_SUBSECTION_GLOBAL("topic", CONF_FLAG_MULTI, kafka_base_producer_topics_config) }, \
 
        CONF_PARSER_TERMINATOR
};