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option.c
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option.c
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/*-------------------------------------------------------------------------
*
* option.c
* FDW option handling for mysql_fdw
*
* Portions Copyright (c) 2012-2014, PostgreSQL Global Development Group
* Portions Copyright (c) 2004-2021, EnterpriseDB Corporation.
*
* IDENTIFICATION
* option.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "access/reloptions.h"
#include "catalog/pg_foreign_server.h"
#include "catalog/pg_foreign_table.h"
#include "catalog/pg_user_mapping.h"
#include "catalog/pg_type.h"
#include "commands/defrem.h"
#include "miscadmin.h"
#include "mysql_fdw.h"
#include "utils/lsyscache.h"
/*
* Describes the valid options for objects that use this wrapper.
*/
struct MySQLFdwOption
{
const char *optname;
Oid optcontext; /* Oid of catalog in which option may appear */
};
/*
* Valid options for mysql_fdw.
*/
static struct MySQLFdwOption valid_options[] =
{
/* Connection options */
{"host", ForeignServerRelationId},
{"port", ForeignServerRelationId},
{"init_command", ForeignServerRelationId},
{"username", UserMappingRelationId},
{"password", UserMappingRelationId},
{"dbname", ForeignTableRelationId},
{"table_name", ForeignTableRelationId},
{"secure_auth", ForeignServerRelationId},
{"max_blob_size", ForeignTableRelationId},
{"use_remote_estimate", ForeignServerRelationId},
/* fetch_size is available on both server and table */
{"fetch_size", ForeignServerRelationId},
{"fetch_size", ForeignTableRelationId},
{"reconnect", ForeignServerRelationId},
{"ssl_key", ForeignServerRelationId},
{"ssl_cert", ForeignServerRelationId},
{"ssl_ca", ForeignServerRelationId},
{"ssl_capath", ForeignServerRelationId},
{"ssl_cipher", ForeignServerRelationId},
/* Sentinel */
{NULL, InvalidOid}
};
extern Datum mysql_fdw_validator(PG_FUNCTION_ARGS);
PG_FUNCTION_INFO_V1(mysql_fdw_validator);
/*
* Validate the generic options given to a FOREIGN DATA WRAPPER, SERVER,
* USER MAPPING or FOREIGN TABLE that uses file_fdw.
*
* Raise an ERROR if the option or its value is considered invalid.
*/
Datum
mysql_fdw_validator(PG_FUNCTION_ARGS)
{
List *options_list = untransformRelOptions(PG_GETARG_DATUM(0));
Oid catalog = PG_GETARG_OID(1);
ListCell *cell;
/*
* Check that only options supported by mysql_fdw, and allowed for the
* current object type, are given.
*/
foreach(cell, options_list)
{
DefElem *def = (DefElem *) lfirst(cell);
if (!mysql_is_valid_option(def->defname, catalog))
{
struct MySQLFdwOption *opt;
StringInfoData buf;
/*
* Unknown option specified, complain about it. Provide a hint
* with list of valid options for the object.
*/
initStringInfo(&buf);
for (opt = valid_options; opt->optname; opt++)
{
if (catalog == opt->optcontext)
appendStringInfo(&buf, "%s%s", (buf.len > 0) ? ", " : "",
opt->optname);
}
ereport(ERROR,
(errcode(ERRCODE_FDW_INVALID_OPTION_NAME),
errmsg("invalid option \"%s\"", def->defname),
errhint("Valid options in this context are: %s",
buf.len ? buf.data : "<none>")));
}
/* Validate fetch_size option value */
if (strcmp(def->defname, "fetch_size") == 0)
{
unsigned long fetch_size;
char *endptr;
char *inputVal = defGetString(def);
while(inputVal && isspace((unsigned char) *inputVal))
inputVal++;
if (inputVal && *inputVal == '-')
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("\"%s\" requires an integer value between 1 to %lu",
def->defname, ULONG_MAX)));
errno = 0;
fetch_size = strtoul(inputVal, &endptr, 10);
if (*endptr != '\0' ||
(errno == ERANGE && fetch_size == ULONG_MAX) ||
fetch_size == 0)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("\"%s\" requires an integer value between 1 to %lu",
def->defname, ULONG_MAX)));
}
else if (strcmp(def->defname, "reconnect") == 0)
{
/* accept only boolean values */
(void) defGetBoolean(def);
}
}
PG_RETURN_VOID();
}
/*
* Check if the provided option is one of the valid options.
* context is the Oid of the catalog holding the object the option is for.
*/
bool
mysql_is_valid_option(const char *option, Oid context)
{
struct MySQLFdwOption *opt;
for (opt = valid_options; opt->optname; opt++)
{
if (context == opt->optcontext && strcmp(opt->optname, option) == 0)
return true;
}
return false;
}
/*
* Fetch the options for a mysql_fdw foreign table.
*/
mysql_opt *
mysql_get_options(Oid foreignoid, bool is_foreigntable)
{
ForeignTable *f_table;
ForeignServer *f_server;
UserMapping *f_mapping;
List *options;
ListCell *lc;
mysql_opt *opt;
opt = (mysql_opt *) palloc0(sizeof(mysql_opt));
/*
* Extract options from FDW objects.
*/
if (is_foreigntable)
{
f_table = GetForeignTable(foreignoid);
f_server = GetForeignServer(f_table->serverid);
}
else
{
f_table = NULL;
f_server = GetForeignServer(foreignoid);
}
f_mapping = GetUserMapping(GetUserId(), f_server->serverid);
options = NIL;
options = mysql_list_concat(options, f_server->options);
options = mysql_list_concat(options, f_mapping->options);
if (f_table)
options = mysql_list_concat(options, f_table->options);
/* Default secure authentication is true */
opt->svr_sa = true;
opt->use_remote_estimate = false;
opt->reconnect = false;
/* Loop through the options */
foreach(lc, options)
{
DefElem *def = (DefElem *) lfirst(lc);
if (strcmp(def->defname, "host") == 0)
opt->svr_address = defGetString(def);
if (strcmp(def->defname, "port") == 0)
opt->svr_port = atoi(defGetString(def));
if (strcmp(def->defname, "username") == 0)
opt->svr_username = defGetString(def);
if (strcmp(def->defname, "password") == 0)
opt->svr_password = defGetString(def);
if (strcmp(def->defname, "dbname") == 0)
opt->svr_database = defGetString(def);
if (strcmp(def->defname, "table_name") == 0)
opt->svr_table = defGetString(def);
if (strcmp(def->defname, "secure_auth") == 0)
opt->svr_sa = defGetBoolean(def);
if (strcmp(def->defname, "init_command") == 0)
opt->svr_init_command = defGetString(def);
if (strcmp(def->defname, "max_blob_size") == 0)
opt->max_blob_size = strtoul(defGetString(def), NULL, 0);
if (strcmp(def->defname, "use_remote_estimate") == 0)
opt->use_remote_estimate = defGetBoolean(def);
if (strcmp(def->defname, "fetch_size") == 0)
opt->fetch_size = strtoul(defGetString(def), NULL, 10);
if (strcmp(def->defname, "reconnect") == 0)
opt->reconnect = defGetBoolean(def);
if (strcmp(def->defname, "ssl_key") == 0)
opt->ssl_key = defGetString(def);
if (strcmp(def->defname, "ssl_cert") == 0)
opt->ssl_cert = defGetString(def);
if (strcmp(def->defname, "ssl_ca") == 0)
opt->ssl_ca = defGetString(def);
if (strcmp(def->defname, "ssl_capath") == 0)
opt->ssl_capath = defGetString(def);
if (strcmp(def->defname, "ssl_cipher") == 0)
opt->ssl_cipher = defGetString(def);
}
/* Default values, if required */
if (!opt->svr_address)
opt->svr_address = "127.0.0.1";
if (!opt->svr_port)
opt->svr_port = MYSQL_SERVER_PORT;
/*
* When we don't have a table name or database name provided in the
* FOREIGN TABLE options, then use a foreign table name as the target table
* name and the namespace of the foreign table as a database name.
*/
if (f_table)
{
if (!opt->svr_table)
opt->svr_table = get_rel_name(foreignoid);
if (!opt->svr_database)
opt->svr_database = get_namespace_name(get_rel_namespace(foreignoid));
}
/* Default value for fetch_size */
if (!opt->fetch_size)
opt->fetch_size = MYSQL_PREFETCH_ROWS;
return opt;
}