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JSON and definable output formatting
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Original file line number | Diff line number | Diff line change |
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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. | ||
*/ | ||
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#include "kafkacat.h" | ||
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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); | ||
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conf.fmt[conf.fmt_cnt].type = type; | ||
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/* 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; | ||
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/* 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 ; | ||
} | ||
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*d = '\0'; | ||
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conf.fmt[conf.fmt_cnt].str_len = | ||
strlen(conf.fmt[conf.fmt_cnt].str); | ||
} | ||
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conf.fmt_cnt ; | ||
} | ||
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/** | ||
* Parse a format string to create a formatter list. | ||
*/ | ||
void fmt_parse (const char *fmt) { | ||
const char *s = fmt, *t; | ||
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while (*s) { | ||
if ((t = strchr(s, '%'))) { | ||
if (t > s) | ||
fmt_add(KC_FMT_STR, s, (int)(t-s)); | ||
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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 's': | ||
fmt_add(KC_FMT_PAYLOAD, 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; | ||
} | ||
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} | ||
} | ||
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void fmt_init (void) { | ||
#ifdef ENABLE_JSON | ||
if (conf.flags & CONF_F_FMT_JSON) | ||
fmt_init_json(); | ||
#endif | ||
} | ||
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void fmt_term (void) { | ||
#ifdef ENABLE_JSON | ||
if (conf.flags & CONF_F_FMT_JSON) | ||
fmt_term_json(); | ||
#endif | ||
} | ||
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/** | ||
* Delimited output | ||
*/ | ||
static void fmt_msg_output_str (FILE *fp, | ||
const rd_kafka_message_t *rkmessage) { | ||
int i; | ||
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for (i = 0 ; i < conf.fmt_cnt ; i ) { | ||
int r = 1; | ||
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switch (conf.fmt[i].type) | ||
{ | ||
case KC_FMT_OFFSET: | ||
r = fprintf(fp, "%"PRId64, rkmessage->offset); | ||
break; | ||
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case KC_FMT_KEY: | ||
if (rkmessage->key_len) | ||
r = fwrite(rkmessage->key, | ||
rkmessage->key_len, 1, fp); | ||
break; | ||
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case KC_FMT_PAYLOAD: | ||
if (rkmessage->len) | ||
r = fwrite(rkmessage->payload, | ||
rkmessage->len, 1, fp); | ||
break; | ||
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case KC_FMT_STR: | ||
r = fwrite(conf.fmt[i].str, conf.fmt[i].str_len, 1, fp); | ||
break; | ||
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case KC_FMT_TOPIC: | ||
r = fprintf(fp, "%s", | ||
rd_kafka_topic_name(rkmessage->rkt)); | ||
break; | ||
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case KC_FMT_PARTITION: | ||
r = fprintf(fp, "%"PRId32, rkmessage->partition); | ||
break; | ||
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} | ||
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if (r < 1) | ||
FATAL("Write error for message " | ||
"of %zd bytes at offset %"PRId64"): %s", | ||
rkmessage->len, rkmessage->offset, | ||
strerror(errno)); | ||
} | ||
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} | ||
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/** | ||
* Format and output a received message. | ||
*/ | ||
void fmt_msg_output (FILE *fp, const rd_kafka_message_t *rkmessage) { | ||
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#ifdef ENABLE_JSON | ||
if (conf.flags & CONF_F_FMT_JSON) | ||
fmt_msg_output_json(fp, rkmessage); | ||
else | ||
#endif | ||
fmt_msg_output_str(fp, rkmessage); | ||
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} |
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