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json.c
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json.c
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/*
* kcat - Apache Kafka consumer and producer
*
* Copyright (c) 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 "kcat.h"
#include <yajl/yajl_gen.h>
#define JS_STR(G, STR) do { \
const char *_s = (STR); \
yajl_gen_string(G, (const unsigned char *)_s, strlen(_s)); \
} while (0)
#define JS_INT(G, INT) yajl_gen_integer(g, INT)
void fmt_msg_output_json (FILE *fp, const rd_kafka_message_t *rkmessage) {
yajl_gen g;
const char *topic = rd_kafka_topic_name(rkmessage->rkt);
const unsigned char *buf;
size_t len;
g = yajl_gen_alloc(NULL);
yajl_gen_map_open(g);
JS_STR(g, "topic");
JS_STR(g, topic);
JS_STR(g, "partition");
yajl_gen_integer(g, (int)rkmessage->partition);
JS_STR(g, "offset");
yajl_gen_integer(g, (long long int)rkmessage->offset);
#if RD_KAFKA_VERSION >= 0x000902ff
{
rd_kafka_timestamp_type_t tstype;
int64_t ts = rd_kafka_message_timestamp(rkmessage, &tstype);
if (tstype != RD_KAFKA_TIMESTAMP_NOT_AVAILABLE) {
JS_STR(g, "tstype");
if (tstype == RD_KAFKA_TIMESTAMP_CREATE_TIME)
JS_STR(g, "create");
else if (tstype == RD_KAFKA_TIMESTAMP_LOG_APPEND_TIME)
JS_STR(g, "logappend");
else
JS_STR(g, "unknown");
JS_STR(g, "ts");
yajl_gen_integer(g, (long long int)ts);
}
}
#else
JS_STR(g, "tstype");
JS_STR(g, "unknown");
JS_STR(g, "ts");
yajl_gen_integer(g, 0);
#endif
JS_STR(g, "broker");
#if RD_KAFKA_VERSION >= 0x010500ff
yajl_gen_integer(g, (int)rd_kafka_message_broker_id(rkmessage));
#else
yajl_gen_integer(g, -1);
#endif
#if HAVE_HEADERS
{
rd_kafka_headers_t *hdrs;
if (!rd_kafka_message_headers(rkmessage, &hdrs)) {
size_t idx = 0;
const char *name;
const void *value;
size_t size;
JS_STR(g, "headers");
yajl_gen_array_open(g);
while (!rd_kafka_header_get_all(hdrs, idx++, &name,
&value, &size)) {
JS_STR(g, name);
if (value)
yajl_gen_string(g, value, size);
else
yajl_gen_null(g);
}
yajl_gen_array_close(g);
}
}
#endif
JS_STR(g, "key");
if (rkmessage->key) {
#if ENABLE_AVRO && YAJL_HAS_GEN_VERBATIM
if (conf.flags & CONF_F_FMT_AVRO_KEY) {
char errstr[256];
int schema_id = -1;
char *json = kc_avro_to_json(
rkmessage->key,
rkmessage->key_len,
&schema_id,
errstr, sizeof(errstr));
if (!json) {
KC_ERROR("Failed to deserialize key in "
"message in %s [%"PRId32"] at "
"offset %"PRId64": %s",
rd_kafka_topic_name(rkmessage->rkt),
rkmessage->partition,
rkmessage->offset, errstr);
yajl_gen_null(g);
JS_STR(g, "key_error");
JS_STR(g, errstr);
} else {
yajl_gen_verbatim(g, json, strlen(json));
JS_STR(g, "key_schema_id");
JS_INT(g, schema_id);
}
free(json);
} else
#endif
yajl_gen_string(g,
(const unsigned char *)rkmessage->key,
rkmessage->key_len);
} else
yajl_gen_null(g);
JS_STR(g, "payload");
if (rkmessage->payload) {
#if ENABLE_AVRO && YAJL_HAS_GEN_VERBATIM
if (conf.flags & CONF_F_FMT_AVRO_VALUE) {
char errstr[256];
int schema_id = -1;
char *json = kc_avro_to_json(
rkmessage->payload,
rkmessage->len,
&schema_id,
errstr, sizeof(errstr));
if (!json) {
KC_ERROR("Failed to deserialize value in "
"message in %s [%"PRId32"] at "
"offset %"PRId64": %s",
rd_kafka_topic_name(rkmessage->rkt),
rkmessage->partition,
rkmessage->offset, errstr);
yajl_gen_null(g);
JS_STR(g, "payload_error");
JS_STR(g, errstr);
} else {
yajl_gen_verbatim(g, json, strlen(json));
JS_STR(g, "value_schema_id");
JS_INT(g, schema_id);
}
free(json);
} else
#endif
yajl_gen_string(g,
(const unsigned char *)
rkmessage->payload,
rkmessage->len);
} else
yajl_gen_null(g);
yajl_gen_map_close(g);
yajl_gen_get_buf(g, &buf, &len);
if (fwrite(buf, len, 1, fp) != 1 ||
(conf.fmt[0].str_len > 0 &&
fwrite(conf.fmt[0].str, conf.fmt[0].str_len, 1, fp) != 1))
KC_FATAL("Output write error: %s", strerror(errno));
yajl_gen_free(g);
}
/**
* Print metadata information
*/
void metadata_print_json (const struct rd_kafka_metadata *metadata,
int32_t controllerid) {
yajl_gen g;
int i, j, k;
const unsigned char *buf;
size_t len;
g = yajl_gen_alloc(NULL);
yajl_gen_map_open(g);
JS_STR(g, "originating_broker");
yajl_gen_map_open(g);
JS_STR(g, "id");
yajl_gen_integer(g, (long long int)metadata->orig_broker_id);
JS_STR(g, "name");
JS_STR(g, metadata->orig_broker_name);
yajl_gen_map_close(g);
JS_STR(g, "query");
yajl_gen_map_open(g);
JS_STR(g, "topic");
JS_STR(g, conf.topic ? : "*");
yajl_gen_map_close(g);
JS_STR(g, "controllerid");
yajl_gen_integer(g, (long long int)controllerid);
/* Iterate brokers */
JS_STR(g, "brokers");
yajl_gen_array_open(g);
for (i = 0 ; i < metadata->broker_cnt ; i++) {
int blen = strlen(metadata->brokers[i].host);
char *host = alloca(blen+1+5+1);
sprintf(host, "%s:%i",
metadata->brokers[i].host, metadata->brokers[i].port);
yajl_gen_map_open(g);
JS_STR(g, "id");
yajl_gen_integer(g, (long long int)metadata->brokers[i].id);
JS_STR(g, "name");
JS_STR(g, host);
yajl_gen_map_close(g);
}
yajl_gen_array_close(g);
/* Iterate topics */
JS_STR(g, "topics");
yajl_gen_array_open(g);
for (i = 0 ; i < metadata->topic_cnt ; i++) {
const struct rd_kafka_metadata_topic *t = &metadata->topics[i];
yajl_gen_map_open(g);
JS_STR(g, "topic");
JS_STR(g, t->topic);
if (t->err) {
JS_STR(g, "error");
JS_STR(g, rd_kafka_err2str(t->err));
}
JS_STR(g, "partitions");
yajl_gen_array_open(g);
/* Iterate topic's partitions */
for (j = 0 ; j < t->partition_cnt ; j++) {
const struct rd_kafka_metadata_partition *p;
p = &t->partitions[j];
yajl_gen_map_open(g);
JS_STR(g, "partition");
yajl_gen_integer(g, (long long int)p->id);
if (p->err) {
JS_STR(g, "error");
JS_STR(g, rd_kafka_err2str(p->err));
}
JS_STR(g, "leader");
yajl_gen_integer(g, (long long int)p->leader);
/* Iterate partition's replicas */
JS_STR(g, "replicas");
yajl_gen_array_open(g);
for (k = 0 ; k < p->replica_cnt ; k++) {
yajl_gen_map_open(g);
JS_STR(g, "id");
yajl_gen_integer(g,
(long long int)p->replicas[k]);
yajl_gen_map_close(g);
}
yajl_gen_array_close(g);
/* Iterate partition's ISRs */
JS_STR(g, "isrs");
yajl_gen_array_open(g);
for (k = 0 ; k < p->isr_cnt ; k++) {
yajl_gen_map_open(g);
JS_STR(g, "id");
yajl_gen_integer(g, (long long int)p->isrs[k]);
yajl_gen_map_close(g);
}
yajl_gen_array_close(g);
yajl_gen_map_close(g);
}
yajl_gen_array_close(g);
yajl_gen_map_close(g);
}
yajl_gen_array_close(g);
yajl_gen_map_close(g);
yajl_gen_get_buf(g, &buf, &len);
if (fwrite(buf, len, 1, stdout) != 1)
KC_FATAL("Output write error: %s", strerror(errno));
yajl_gen_free(g);
}
/**
* @brief Generate (if json_gen is a valid yajl_gen), or print (if json_gen is NULL)
* a map of topic+partitions+offsets[+errors]
*
* { "<topic>": { "topic": "<topic>",
* "<partition>": { "partition": <partition>, "offset": <o>,
* ["error": "..."]},
* .. },
* .. }
*/
void partition_list_print_json (const rd_kafka_topic_partition_list_t *parts,
void *json_gen) {
yajl_gen g = (yajl_gen)json_gen;
int i;
const char *last_topic = "";
if (!g)
g = yajl_gen_alloc(NULL);
yajl_gen_map_open(g);
for (i = 0 ; i < parts->cnt ; i++) {
const rd_kafka_topic_partition_t *p = &parts->elems[i];
char partstr[16];
if (strcmp(last_topic, p->topic)) {
if (*last_topic)
yajl_gen_map_close(g); /* topic */
JS_STR(g, p->topic);
yajl_gen_map_open(g); /* topic */
JS_STR(g, "topic");
JS_STR(g, p->topic);
last_topic = p->topic;
}
snprintf(partstr, sizeof(partstr), "%"PRId32, p->partition);
JS_STR(g, partstr);
yajl_gen_map_open(g);
JS_STR(g, "partition");
yajl_gen_integer(g, p->partition);
JS_STR(g, "offset");
yajl_gen_integer(g, p->offset);
if (p->err) {
JS_STR(g, "error");
JS_STR(g, rd_kafka_err2str(p->err));
}
yajl_gen_map_close(g);
}
if (*last_topic)
yajl_gen_map_close(g); /* topic */
yajl_gen_map_close(g);
if (!json_gen) {
const unsigned char *buf;
size_t len;
yajl_gen_get_buf(g, &buf, &len);
(void)fwrite(buf, len, 1, stdout);
yajl_gen_free(g);
}
}
void fmt_init_json (void) {
}
void fmt_term_json (void) {
}
int json_can_emit_verbatim (void) {
#if YAJL_HAS_GEN_VERBATIM
return 1;
#else
return 0;
#endif
}