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format.c
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format.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 "rdendian.h"
#include "base64.h"
static void fmt_add (fmt_type_t type, const char *str, int len) {
if (conf.fmt_cnt == KC_FMT_MAX_SIZE)
KC_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 */
default:
if (*s >= '0' && *s <= '9') {
*d = (char)strtoul(
s, (char **)&next,
base);
if (next > s)
s = next - 1;
} else {
*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 'a':
fmt_add(KC_FMT_KEY_BASE64, 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 'b':
fmt_add(KC_FMT_PAYLOAD_BASE64, NULL, 0);
break;
case 'S':
fmt_add(KC_FMT_PAYLOAD_LEN, NULL, 0);
break;
case 'R':
fmt_add(KC_FMT_PAYLOAD_LEN_BINARY, NULL, 0);
break;
case 't':
fmt_add(KC_FMT_TOPIC, NULL, 0);
break;
case 'p':
fmt_add(KC_FMT_PARTITION, NULL, 0);
break;
case 'T':
fmt_add(KC_FMT_TIMESTAMP, NULL, 0);
conf.flags |= CONF_F_APIVERREQ;
break;
#if HAVE_HEADERS
case 'h':
fmt_add(KC_FMT_HEADERS, NULL, 0);
conf.flags |= CONF_F_APIVERREQ;
break;
#endif
case '%':
fmt_add(KC_FMT_STR, s, 1);
break;
case '\0':
KC_FATAL("Empty formatter");
break;
default:
KC_FATAL("Unsupported formatter: %%%c", *s);
break;
}
s++;
} else {
fmt_add(KC_FMT_STR, s, strlen(s));
break;
}
}
}
void fmt_init (void) {
#if ENABLE_JSON
if (conf.flags & CONF_F_FMT_JSON)
fmt_init_json();
#endif
}
void fmt_term (void) {
#if ENABLE_JSON
if (conf.flags & CONF_F_FMT_JSON)
fmt_term_json();
#endif
}
#if HAVE_HEADERS
static int print_headers (FILE *fp, const rd_kafka_headers_t *hdrs) {
size_t idx = 0;
const char *name;
const void *value;
size_t size;
while (!rd_kafka_header_get_all(hdrs, idx++, &name, &value, &size)) {
fprintf(fp, "%s%s=", idx > 1 ? "," : "", name);
if (value && size > 0)
fprintf(fp, "%.*s", (int)size, (const char *)value);
else if (!value)
fprintf(fp, "NULL");
}
return 1;
}
#endif
/**
* @brief Check that the pack-format string is valid.
*/
void pack_check (const char *what, const char *fmt) {
const char *f = fmt;
static const char *valid = " <>bBhHiIqQcs$";
if (!*fmt)
KC_FATAL("%s pack-format must not be empty", what);
while (*f) {
if (!strchr(valid, (int)(*f)))
KC_FATAL("Invalid token '%c' in %s pack-format, "
"see -s usage.",
(int)(*f), what);
f++;
}
}
/**
* @brief Unpack (deserialize) the data at \p buf using the
* pack-format string \p fmt.
* \p fmt must be a valid pack-format string.
* Prints result to \p fp.
*
* Format is inspired by Python's struct.unpack()
*
* @returns 0 on success or -1 on error.
*/
static int unpack (FILE *fp, const char *what, const char *fmt,
const char *buf, size_t len,
char *errstr, size_t errstr_size) {
const char *b = buf;
const char *end = buf+len;
const char *f = fmt;
enum {
big_endian,
little_endian
} endian = big_endian;
#define endian_swap(val,to_little,to_big) \
(endian == big_endian ? to_big(val) : to_little(val))
#define fup_copy(dst,sz) do { \
if ((sz) > remaining) { \
snprintf(errstr, errstr_size, \
"%s truncated, expected %d bytes " \
"to unpack %c but only %d bytes remaining", \
what, (int)(sz), (int)(*f), \
(int)remaining); \
return -1; \
} \
memcpy(dst, b, sz); \
b += (sz); \
} while (0)
while (*f) {
size_t remaining = (int)(end - b);
switch ((int)*f)
{
case ' ':
fprintf(fp, " ");
break;
case '<':
endian = little_endian;
break;
case '>':
endian = big_endian;
break;
case 'b':
{
int8_t v;
fup_copy(&v, sizeof(v));
fprintf(fp, "%d", (int)v);
}
break;
case 'B':
{
uint8_t v;
fup_copy(&v, sizeof(v));
fprintf(fp, "%u", (unsigned int)v);
}
break;
case 'h':
{
int16_t v;
fup_copy(&v, sizeof(v));
v = endian_swap(v, be16toh, be16toh);
fprintf(fp, "%hd", v);
}
break;
case 'H':
{
uint16_t v;
fup_copy(&v, sizeof(v));
v = endian_swap(v, be16toh, be16toh);
fprintf(fp, "%hu", v);
}
break;
case 'i':
{
int32_t v;
fup_copy(&v, sizeof(v));
v = endian_swap(v, be32toh, htobe32);
fprintf(fp, "%d", v);
}
break;
case 'I':
{
uint32_t v;
fup_copy(&v, sizeof(v));
v = endian_swap(v, be32toh, htobe32);
fprintf(fp, "%u", v);
}
break;
case 'q':
{
int64_t v;
fup_copy(&v, sizeof(v));
v = endian_swap(v, be64toh, htobe64);
fprintf(fp, "%"PRId64, v);
}
break;
case 'Q':
{
uint64_t v;
fup_copy(&v, sizeof(v));
v = endian_swap(v, be64toh, htobe64);
fprintf(fp, "%"PRIu64, v);
}
break;
case 'c':
fprintf(fp, "%c", (int)*b);
b++;
break;
case 's':
{
fprintf(fp, "%.*s", (int)remaining, b);
b += remaining;
}
break;
case '$':
{
if (remaining > 0) {
snprintf(errstr, errstr_size,
"expected %s end-of-input, "
"but %d bytes remaining",
what, (int)remaining);
return -1;
}
}
break;
default:
KC_FATAL("Invalid pack-format token '%c'", (int)*f);
break;
}
f++;
}
/* Ignore remaining input bytes, if any. */
return 0;
#undef endian_swap
#undef fup_copy
}
/**
* @brief Deserialize the Avro data in \p buf to JSON format, and print the
* result to \p fp. If an error occurs during Avro deserialization,
* \p errstr describes the Avro error itself, while \p field_errstr
* indicates which Kafka field (key or message) produced the error.
*
* @returns The number of chars written on success, or a negative value on error.
*/
static int fmt_avro (FILE *fp, const char *buf, size_t len,
char* errstr, size_t errstr_len,
kc_msg_field_t field, const char **field_errstr) {
#if ENABLE_AVRO
static const char* field_errstrs[KC_MSG_FIELD_CNT] = {
"Avro/Schema-registry message deserialization",
"Avro/Schema-registry key deserialization",
};
char *json = kc_avro_to_json(buf, len,NULL, errstr, errstr_len);
if (!json) {
*field_errstr = field_errstrs[field];
return -1;
}
int chars_written = fprintf(fp, "%s", json);
free(json);
return chars_written;
#else
KC_FATAL("NOTREACHED");
#endif
}
/**
* @brief Base64-encode the data in \p buf, and print the result to \p fp.
*
* @returns The number of chars written on success, or a negative value on error.
*/
static int fmt_base64 (FILE *fp, const char *buf, size_t len) {
size_t outlen;
char* outbuf = base64_encode(buf, len, &outlen);
if (!outbuf) {
KC_FATAL("Failed to allocate base64 output buffer\n");
return 0;
}
size_t chars_written = fwrite(outbuf, outlen, sizeof(char), fp);
free(outbuf);
return (int) chars_written;
}
/**
* Delimited output
*/
static void fmt_msg_output_str (FILE *fp,
const rd_kafka_message_t *rkmessage) {
int i;
char errstr[256];
*errstr = '\0';
for (i = 0 ; i < conf.fmt_cnt ; i++) {
int r = 1;
uint32_t belen;
const char *what_failed = "";
switch (conf.fmt[i].type)
{
case KC_FMT_OFFSET:
r = fprintf(fp, "%"PRId64, rkmessage->offset);
break;
case KC_FMT_KEY_BASE64:
if (rkmessage->key_len){
r = fmt_base64(fp, rkmessage->key, rkmessage->key_len);
} else if (conf.flags & CONF_F_NULL)
r = fwrite(conf.null_str,
conf.null_str_len, 1, fp);
break;
case KC_FMT_KEY:
if (rkmessage->key_len) {
if (conf.flags & CONF_F_FMT_AVRO_KEY) {
r = fmt_avro(fp, rkmessage->key, rkmessage->key_len,
errstr, sizeof(errstr),
KC_MSG_FIELD_KEY, &what_failed);
if (*what_failed)
goto fail;
} else if (conf.flags & CONF_F_FMT_BASE64_KEY) {
r = fmt_base64(fp, rkmessage->key, rkmessage->key_len);
} else if (conf.pack[KC_MSG_FIELD_KEY]) {
if (unpack(fp,
"key",
conf.pack[KC_MSG_FIELD_KEY],
rkmessage->key,
rkmessage->key_len,
errstr, sizeof(errstr)) ==
-1)
goto fail;
} else
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 ? (ssize_t)rkmessage->key_len : -1);
break;
case KC_FMT_PAYLOAD_BASE64:
if (rkmessage->len)
r = fmt_base64(fp, rkmessage->payload, rkmessage->len);
else if (conf.flags & CONF_F_NULL)
r = fwrite(conf.null_str,
conf.null_str_len, 1, fp);
break;
case KC_FMT_PAYLOAD:
if (rkmessage->len) {
if (conf.flags & CONF_F_FMT_AVRO_VALUE) {
r = fmt_avro(fp, rkmessage->payload, rkmessage->len,
errstr, sizeof(errstr),
KC_MSG_FIELD_VALUE, &what_failed);
if (*what_failed)
goto fail;
} else if (conf.flags & CONF_F_FMT_BASE64_VALUE) {
r = fmt_base64(fp, rkmessage->payload, rkmessage->len);
} else if (conf.pack[KC_MSG_FIELD_VALUE]) {
if (unpack(fp,
"value",
conf.pack[KC_MSG_FIELD_VALUE],
rkmessage->payload,
rkmessage->len,
errstr, sizeof(errstr)) ==
-1)
goto fail;
} else
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 ? (ssize_t)rkmessage->len : -1);
break;
case KC_FMT_PAYLOAD_LEN_BINARY:
/* Use -1 to indicate NULL messages */
belen = htobe32((uint32_t)(rkmessage->payload ?
(ssize_t)rkmessage->len :
-1));
r = fwrite(&belen, sizeof(uint32_t), 1, fp);
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;
case KC_FMT_TIMESTAMP:
{
#if RD_KAFKA_VERSION >= 0x000902ff
rd_kafka_timestamp_type_t tstype;
r = fprintf(fp, "%"PRId64,
rd_kafka_message_timestamp(rkmessage,
&tstype));
#else
r = fprintf(fp, "-1");
#endif
break;
}
case KC_FMT_HEADERS:
{
#if HAVE_HEADERS
rd_kafka_headers_t *hdrs;
rd_kafka_resp_err_t err;
err = rd_kafka_message_headers(rkmessage, &hdrs);
if (err == RD_KAFKA_RESP_ERR__NOENT) {
r = 1; /* Fake it to continue */
} else if (err != RD_KAFKA_RESP_ERR_NO_ERROR) {
what_failed = "Failed to parse headers";
snprintf(errstr, sizeof(errstr), "%s",
rd_kafka_err2str(err));
goto fail;
} else {
r = print_headers(fp, hdrs);
}
#endif
break;
}
}
if (r < 1)
KC_FATAL("Write error for message "
"of %zd bytes in %s [%"PRId32"] "
"at offset %"PRId64": %s",
rkmessage->len,
rd_kafka_topic_name(rkmessage->rkt),
rkmessage->partition,
rkmessage->offset,
strerror(errno));
continue;
fail:
KC_ERROR("Failed to format message in %s [%"PRId32"] "
"at offset %"PRId64": %s%s%s",
rd_kafka_topic_name(rkmessage->rkt),
rkmessage->partition,
rkmessage->offset,
what_failed, *what_failed ? ": " : "",
errstr);
return;
}
}
/**
* Format and output a received message.
*/
void fmt_msg_output (FILE *fp, const rd_kafka_message_t *rkmessage) {
#if ENABLE_JSON
if (conf.flags & CONF_F_FMT_JSON)
fmt_msg_output_json(fp, rkmessage);
else
#endif
fmt_msg_output_str(fp, rkmessage);
}