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/*-
* Public Domain 2014-present MongoDB, Inc.
* Public Domain 2008-2014 WiredTiger, Inc.
*
* This is free and unencumbered software released into the public domain.
*
* Anyone is free to copy, modify, publish, use, compile, sell, or
* distribute this software, either in source code form or as a compiled
* binary, for any purpose, commercial or non-commercial, and by any
* means.
*
* In jurisdictions that recognize copyright laws, the author or authors
* of this software dedicate any and all copyright interest in the
* software to the public domain. We make this dedication for the benefit
* of the public at large and to the detriment of our heirs and
* successors. We intend this dedication to be an overt act of
* relinquishment in perpetuity of all present and future rights to this
* software under copyright law.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
#include <string.h>
#include <limits.h>
#include <errno.h>
#include <stdlib.h>
#include <wiredtiger_ext.h>
/*
* A simple WiredTiger extractor that separates a single string field,
* interpreted as column separated values (CSV), into component pieces.
* When an index is configured with this extractor and app_metadata
* set to a number N, the Nth field is returned as a string.
*
* For example, if a value in the primary table is
* "Paris,France,CET,2273305"
* and this extractor is configured with app_metadata=2, then
* the extractor for this value would return "CET".
*/
/* Local extractor structure. */
typedef struct {
WT_EXTRACTOR extractor; /* Must come first */
WT_EXTENSION_API *wt_api; /* Extension API */
int field; /* Field to extract */
int format_isnum; /* Field contents are numeric */
} CSV_EXTRACTOR;
/*
* csv_error --
* Display an error from this module in a standard way.
*/
static int
csv_error(const CSV_EXTRACTOR *csv_extractor, WT_SESSION *session, int err, const char *msg)
{
WT_EXTENSION_API *wt_api;
wt_api = csv_extractor->wt_api;
(void)wt_api->err_printf(
wt_api, session, "csv extraction: %s: %s", msg, wt_api->strerror(wt_api, NULL, err));
return (err);
}
/*
* csv_extract --
* WiredTiger CSV extraction.
*/
static int
csv_extract(WT_EXTRACTOR *extractor, WT_SESSION *session, const WT_ITEM *key, const WT_ITEM *value,
WT_CURSOR *result_cursor)
{
const CSV_EXTRACTOR *csv_extractor;
WT_EXTENSION_API *wt_api;
size_t len;
int i, ret, val;
char *copy, *p, *pend, *valstr;
(void)key; /* Unused parameters */
csv_extractor = (const CSV_EXTRACTOR *)extractor;
wt_api = csv_extractor->wt_api;
/* Unpack the value. */
if ((ret = wt_api->struct_unpack(wt_api, session, value->data, value->size, "S", &valstr)) != 0)
return (ret);
p = valstr;
pend = strchr(p, ',');
for (i = 0; i < csv_extractor->field && pend != NULL; i++) {
p = pend + 1;
pend = strchr(p, ',');
}
if (i == csv_extractor->field) {
if (pend == NULL)
pend = p + strlen(p);
/*
* The key we must return is a null terminated string, but p is not necessarily
* NULL-terminated. So make a copy, just for the duration of the insert.
*/
len = (size_t)(pend - p);
if ((copy = malloc(len + 1)) == NULL)
return (errno);
strncpy(copy, p, len);
copy[len] = '\0';
if (csv_extractor->format_isnum) {
if ((val = atoi(copy)) < 0) {
ret = csv_error(csv_extractor, session, EINVAL, "invalid key value");
free(copy);
return (ret);
}
result_cursor->set_key(result_cursor, val);
} else
result_cursor->set_key(result_cursor, copy);
ret = result_cursor->insert(result_cursor);
free(copy);
if (ret != 0)
return (ret);
}
return (0);
}
/*
* csv_customize --
* The customize function creates a customized extractor, needed to save the field number and
* format.
*/
static int
csv_customize(WT_EXTRACTOR *extractor, WT_SESSION *session, const char *uri, WT_CONFIG_ITEM *appcfg,
WT_EXTRACTOR **customp)
{
const CSV_EXTRACTOR *orig;
CSV_EXTRACTOR *csv_extractor;
WT_CONFIG_ITEM field, format;
WT_CONFIG_PARSER *parser;
WT_EXTENSION_API *wt_api;
long field_num;
int ret;
(void)uri; /* Unused parameters */
orig = (const CSV_EXTRACTOR *)extractor;
wt_api = orig->wt_api;
parser = NULL;
if ((ret = wt_api->config_parser_open(wt_api, session, appcfg->str, appcfg->len, &parser)) != 0)
return (ret);
if ((ret = parser->get(parser, "field", &field)) != 0) {
if (ret == WT_NOTFOUND)
(void)wt_api->err_printf(wt_api, session, "field not found");
else
(void)wt_api->err_printf(wt_api, session, "WT_CONFIG_PARSER.get: field: %s",
wt_api->strerror(wt_api, session, ret));
goto err;
}
if ((ret = parser->get(parser, "format", &format)) != 0) {
if (ret == WT_NOTFOUND)
(void)wt_api->err_printf(wt_api, session, "format not found");
else
(void)wt_api->err_printf(wt_api, session, "WT_CONFIG_PARSER.get: format: %s",
wt_api->strerror(wt_api, session, ret));
goto err;
}
if (ret != 0) {
(void)wt_api->err_printf(
wt_api, session, "WT_CONFIG_PARSER.close: %s", wt_api->strerror(wt_api, session, ret));
}
field_num = strtol(field.str, NULL, 10);
if (field_num < 0 || field_num > INT_MAX) {
(void)wt_api->err_printf(wt_api, session, "field: invalid format");
ret = EINVAL;
goto err;
}
if (format.len != 1 || (format.str[0] != 'S' && format.str[0] != 'i')) {
(void)wt_api->err_printf(wt_api, session, "format: invalid format");
ret = EINVAL;
goto err;
}
if ((csv_extractor = calloc(1, sizeof(CSV_EXTRACTOR))) == NULL) {
ret = errno;
goto err;
}
*csv_extractor = *orig;
csv_extractor->field = (int)field_num;
csv_extractor->format_isnum = (format.str[0] == 'i');
*customp = (WT_EXTRACTOR *)csv_extractor;
return (0);
err:
if (parser != NULL)
(void)parser->close(parser);
return (ret);
}
/*
* csv_terminate --
* Terminate is called to free the CSV and any associated memory.
*/
static int
csv_terminate(WT_EXTRACTOR *extractor, WT_SESSION *session)
{
(void)session; /* Unused parameters */
/* Free the allocated memory. */
free(extractor);
return (0);
}
/*
* wiredtiger_extension_init --
* WiredTiger CSV extraction extension.
*/
int
wiredtiger_extension_init(WT_CONNECTION *connection, WT_CONFIG_ARG *config)
{
CSV_EXTRACTOR *csv_extractor;
int ret;
(void)config; /* Unused parameters */
if ((csv_extractor = calloc(1, sizeof(CSV_EXTRACTOR))) == NULL)
return (errno);
csv_extractor->extractor.extract = csv_extract;
csv_extractor->extractor.customize = csv_customize;
csv_extractor->extractor.terminate = csv_terminate;
csv_extractor->wt_api = connection->get_extension_api(connection);
if ((ret = connection->add_extractor(connection, "csv", (WT_EXTRACTOR *)csv_extractor, NULL)) ==
0)
return (0);
free(csv_extractor);
return (ret);
}
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