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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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