-
Notifications
You must be signed in to change notification settings - Fork 473
/
format.c
585 lines (515 loc) · 21.5 KB
/
format.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
/*
* 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"
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 '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 '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
}
/**
* 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:
if (rkmessage->key_len) {
if (conf.flags & CONF_F_FMT_AVRO_KEY) {
#if ENABLE_AVRO
char *json = kc_avro_to_json(
rkmessage->key,
rkmessage->key_len,
NULL,
errstr, sizeof(errstr));
if (!json) {
what_failed =
"Avro/Schema-registry "
"key deserialization";
goto fail;
}
r = fprintf(fp, "%s", json);
free(json);
#else
KC_FATAL("NOTREACHED");
#endif
} 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:
if (rkmessage->len) {
if (conf.flags & CONF_F_FMT_AVRO_VALUE) {
#if ENABLE_AVRO
char *json = kc_avro_to_json(
rkmessage->payload,
rkmessage->len,
NULL,
errstr, sizeof(errstr));
if (!json) {
what_failed =
"Avro/Schema-registry "
"message "
"deserialization";
goto fail;
}
r = fprintf(fp, "%s", json);
free(json);
#else
KC_FATAL("NOTREACHED");
#endif
} 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);
}