42b52c6f51
buffer.c:gwbuf_make_contiguous: hint wasn't duplicated to new GWBUF struct. As a result hints were lost if query rewriting resulted in longer query than the original.
157 lines
3.2 KiB
C
157 lines
3.2 KiB
C
/*
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* This file is distributed as part of MaxScale. It is free
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* software: you can redistribute it and/or modify it under the terms of the
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* GNU General Public License as published by the Free Software Foundation,
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* version 2.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 51
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* Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Copyright MariaDB Corporation Ab 2014
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <hint.h>
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/**
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* @file hint.c generic support routines for hints.
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*
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* @verbatim
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* Revision History
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*
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* Date Who Description
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* 25/07/14 Mark Riddoch Initial implementation
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*
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* @endverbatim
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*/
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/**
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* Duplicate a list of hints
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*
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* @param hint The hint list to duplicate
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* @return A duplicate of the list
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*
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* Note : Optimize this to use version numbering instead of copying memory
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*/
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HINT *
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hint_dup(HINT *hint)
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{
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HINT *nlhead = NULL, *nltail = NULL, *ptr1, *ptr2;
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ptr1 = hint;
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while (ptr1)
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{
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if ((ptr2 = (HINT *)malloc(sizeof(HINT))) == NULL)
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return nlhead;
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ptr2->type = ptr1->type;
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if (ptr1->data)
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ptr2->data = strdup(ptr1->data);
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else
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ptr2->data = NULL;
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if (ptr1->value)
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ptr2->value = strdup(ptr1->value);
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else
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ptr2->value = NULL;
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ptr2->next = NULL;
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if (nltail)
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{
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nltail->next = ptr2;
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nltail = ptr2;
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}
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else
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{
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nlhead = ptr2;
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nltail = ptr2;
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}
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ptr1 = ptr1->next;
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}
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return nlhead;
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}
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/**
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* Create a ROUTE TO type hint
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*
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* @param head The current hint list
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* @param type The HINT_TYPE
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* @param data Data may be NULL or the name of a server to route to
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* @return The result hint list
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*/
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HINT *
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hint_create_route(HINT *head, HINT_TYPE type, char *data)
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{
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HINT *hint;
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if ((hint = (HINT *)malloc(sizeof(HINT))) == NULL)
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return head;
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hint->next = head;
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hint->type = type;
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if (data)
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hint->data = strdup(data);
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else
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hint->data = NULL;
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hint->value = NULL;
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return hint;
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}
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/**
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* Create name/value parameter hint
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*
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* @param head The current hint list
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* @param pname The parameter name
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* @param value The parameter value
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* @return The result hint list
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*/
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HINT *
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hint_create_parameter(HINT *head, char *pname, char *value)
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{
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HINT *hint;
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if ((hint = (HINT *)malloc(sizeof(HINT))) == NULL)
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return head;
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hint->next = head;
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hint->type = HINT_PARAMETER;
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hint->data = strdup(pname);
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hint->value = strdup(value);
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return hint;
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}
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/**
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* free_hint - free a hint
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*
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* @param hint The hint to free
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*/
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void
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hint_free(HINT *hint)
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{
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if (hint->data)
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free(hint->data);
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if (hint->value)
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free(hint->value);
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free(hint);
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}
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bool hint_exists(
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HINT** p_hint,
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HINT_TYPE type)
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{
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bool succp = false;
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while (*p_hint != NULL)
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{
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if ((*p_hint)->type == type)
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{
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succp = true;
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}
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p_hint = &(*p_hint)->next;
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}
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return succp;
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}
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