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/*
* kafkacat - Apache Kafka consumer and producer
*
* Copyright (c) 2019, 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"
#include <libserdes/serdes-avro.h>
static serdes_t *serdes;
static serdes_schema_t *key_schema, *value_schema;
/**
* @brief Load schema from file.
*
* @param name_and_path is in the format: "schema_name:path/to/schema.avsc"
*
* @returns the schema object on success, will KC_FATAL on error.
*/
static serdes_schema_t *load_schema (const char *name, const char *path) {
serdes_schema_t *schema;
FILE *fp;
char *buf;
long size;
char errstr[256];
if (!(fp = fopen(path, "r")))
KC_FATAL("Failed to open schema file %s: %s",
path, strerror(errno));
fseek(fp, 0, SEEK_END);
size = ftell(fp);
fseek(fp, 0, SEEK_SET);
if (size <= 0)
KC_FATAL("Schema file %s is too small: %ld", path, size);
buf = malloc(size+1);
if (!buf)
KC_FATAL("Failed to allocate buffer for %s of %ld bytes: %s",
path, size, strerror(errno));
if (fread(buf, size, 1, fp) != 1)
KC_FATAL("Failed to read schema file %s: %s",
path, strerror(errno));
fclose(fp);
buf[size] = '\0';
schema = serdes_schema_add(serdes, name, -1, buf, (int)size,
errstr, sizeof(errstr));
if (!schema)
KC_FATAL("Failed parse schema file %s: %s", path, errstr);
return schema;
}
void kc_avro_init (const char *key_schema_name,
const char *key_schema_path,
const char *value_schema_name,
const char *value_schema_path) {
char errstr[512];
serdes = serdes_new(conf.srconf, errstr, sizeof(errstr));
if (!serdes)
KC_FATAL("Failed to create schema-registry client: %s", errstr);
conf.srconf = NULL;
if (key_schema_path)
key_schema = load_schema(key_schema_name,
key_schema_path);
if (value_schema_path)
value_schema = load_schema(value_schema_name,
value_schema_path);
}
void kc_avro_term (void) {
if (value_schema)
serdes_schema_destroy(value_schema);
if (key_schema)
serdes_schema_destroy(key_schema);
if (serdes)
serdes_destroy(serdes);
}
/**
* @brief Decodes the schema-id framed Avro blob in \p data
* and encodes it as JSON, which is returned as a newly allocated
* buffer which the caller must free.
*
* @returns newly allocated JSON string, or NULL on error.
*/
char *kc_avro_to_json (const void *data, size_t data_len,
char *errstr, size_t errstr_size) {
avro_value_t avro;
serdes_schema_t *schema;
char *json;
serdes_err_t err;
err = serdes_deserialize_avro(serdes, &avro, &schema, data, data_len,
errstr, errstr_size);
if (err) {
if (err == SERDES_ERR_FRAMING_INVALID ||
strstr(errstr, "Invalid CP1 magic byte")) {
static const char badframing[] =
": message not produced with "
"Schema-Registry Avro framing";
int len = strlen(errstr);
if (len + sizeof(badframing) < errstr_size)
snprintf(errstr+len, errstr_size-len,
"%s", badframing);
}
return NULL;
}
if (avro_value_to_json(&avro, 1/*one-line*/, &json)) {
snprintf(errstr, errstr_size, "Failed to encode Avro as JSON");
avro_value_decref(&avro);
return NULL;
}
avro_value_decref(&avro);
return json;
}
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