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format.c
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format.c
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/*
* kafkacat - 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 "kafkacat.h"
static void fmt_add (fmt_type_t type, const char *str, int len) {
if (conf.fmt_cnt == KC_FMT_MAX_SIZE)
FATAL("Too many formatters & strings (KC_FMT_MAX_SIZE=%i)",
KC_FMT_MAX_SIZE);
conf.fmt[conf.fmt_cnt].type = type;
/* For STR types */
if (len) {
const char *s;
char *d;
conf.fmt[conf.fmt_cnt].str = d = malloc(len+1);
memcpy(d, str, len);
d[len] = '\0';
s = d;
/* Convert \.. sequences */
while (*s) {
if (*s == '\\' && *(s+1)) {
int base = 0;
const char *next;
s++;
switch (*s) {
case 't':
*d = '\t';
break;
case 'n':
*d = '\n';
break;
case 'r':
*d = '\r';
break;
case 'x':
s++;
base = 16;
/* FALLTHRU */
case '0'...'9':
*d = (char)strtoul(s, (char **)&next,
base);
if (next > s)
s = next-1;
break;
default:
*d = *s;
break;
}
} else {
*d = *s;
}
s++;
d++;
}
*d = '\0';
conf.fmt[conf.fmt_cnt].str_len =
strlen(conf.fmt[conf.fmt_cnt].str);
}
conf.fmt_cnt++;
}
/**
* Parse a format string to create a formatter list.
*/
void fmt_parse (const char *fmt) {
const char *s = fmt, *t;
while (*s) {
if ((t = strchr(s, '%'))) {
if (t > s)
fmt_add(KC_FMT_STR, s, (int)(t-s));
s = t+1;
switch (*s)
{
case 'o':
fmt_add(KC_FMT_OFFSET, NULL, 0);
break;
case 'k':
fmt_add(KC_FMT_KEY, NULL, 0);
break;
case 'K':
fmt_add(KC_FMT_KEY_LEN, NULL, 0);
break;
case 's':
fmt_add(KC_FMT_PAYLOAD, NULL, 0);
break;
case 'S':
fmt_add(KC_FMT_PAYLOAD_LEN, NULL, 0);
break;
case 't':
fmt_add(KC_FMT_TOPIC, NULL, 0);
break;
case 'p':
fmt_add(KC_FMT_PARTITION, NULL, 0);
break;
case '%':
fmt_add(KC_FMT_STR, s, 1);
break;
case '\0':
FATAL("Empty formatter");
break;
default:
FATAL("Unsupported formatter: %%%c", *s);
break;
}
s++;
} else {
fmt_add(KC_FMT_STR, s, strlen(s));
break;
}
}
}
void fmt_init (void) {
#ifdef ENABLE_JSON
if (conf.flags & CONF_F_FMT_JSON)
fmt_init_json();
#endif
}
void fmt_term (void) {
#ifdef ENABLE_JSON
if (conf.flags & CONF_F_FMT_JSON)
fmt_term_json();
#endif
}
/**
* Delimited output
*/
static void fmt_msg_output_str (FILE *fp,
const rd_kafka_message_t *rkmessage) {
int i;
for (i = 0 ; i < conf.fmt_cnt ; i++) {
int r = 1;
switch (conf.fmt[i].type)
{
case KC_FMT_OFFSET:
r = fprintf(fp, "%"PRId64, rkmessage->offset);
break;
case KC_FMT_KEY:
if (rkmessage->key_len)
r = fwrite(rkmessage->key,
rkmessage->key_len, 1, fp);
else if (conf.flags & CONF_F_NULL)
r = fwrite(conf.null_str,
conf.null_str_len, 1, fp);
break;
case KC_FMT_KEY_LEN:
r = fprintf(fp, "%zd",
/* Use -1 to indicate NULL keys */
rkmessage->key ? rkmessage->key_len : -1);
break;
case KC_FMT_PAYLOAD:
if (rkmessage->len)
r = fwrite(rkmessage->payload,
rkmessage->len, 1, fp);
else if (conf.flags & CONF_F_NULL)
r = fwrite(conf.null_str,
conf.null_str_len, 1, fp);
break;
case KC_FMT_PAYLOAD_LEN:
r = fprintf(fp, "%zd",
/* Use -1 to indicate NULL messages */
rkmessage->payload ? rkmessage->len : -1);
break;
case KC_FMT_STR:
r = fwrite(conf.fmt[i].str, conf.fmt[i].str_len, 1, fp);
break;
case KC_FMT_TOPIC:
r = fprintf(fp, "%s",
rd_kafka_topic_name(rkmessage->rkt));
break;
case KC_FMT_PARTITION:
r = fprintf(fp, "%"PRId32, rkmessage->partition);
break;
}
if (r < 1)
FATAL("Write error for message "
"of %zd bytes at offset %"PRId64"): %s",
rkmessage->len, rkmessage->offset,
strerror(errno));
}
}
/**
* Format and output a received message.
*/
void fmt_msg_output (FILE *fp, const rd_kafka_message_t *rkmessage) {
#ifdef ENABLE_JSON
if (conf.flags & CONF_F_FMT_JSON)
fmt_msg_output_json(fp, rkmessage);
else
#endif
fmt_msg_output_str(fp, rkmessage);
}