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/******************************************************************************
* $Id$
*
* Project: MapServer
* Purpose: MapCache tile caching support file: Mapserver Mapfile datasource
* Author: Thomas Bonfort and the MapServer team.
*
******************************************************************************
* Copyright (c) 1996-2011 Regents of the University of Minnesota.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies of this Software or works derived from this Software.
*
* 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 OR COPYRIGHT HOLDERS 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 "mapcache.h"
#include "ezxml.h"
#include <apr_tables.h>
#include <apr_strings.h>
typedef struct mapcache_source_fallback mapcache_source_fallback;
struct mapcache_source_fallback {
mapcache_source source;
apr_array_header_t *sources;
};
/**
* \private \memberof mapcache_source_fallback
* \sa mapcache_source::render_map()
*/
void _mapcache_source_fallback_render_map(mapcache_context *ctx, mapcache_source *psource, mapcache_map *map)
{
mapcache_source_fallback *source = (mapcache_source_fallback*)psource;
mapcache_source *subsource;
int i;
subsource = APR_ARRAY_IDX(source->sources,0,mapcache_source*);
mapcache_source_render_map(ctx, subsource, map);
if(GC_HAS_ERROR(ctx)) {
int first_error = ctx->get_error(ctx);
char *first_error_message = ctx->get_error_message(ctx);
ctx->log(ctx,MAPCACHE_INFO,
"failed render on primary source \"%s\" on tileset \"%s\". Falling back on secondary sources",
subsource->name,map->tileset->name);
ctx->clear_errors(ctx);
for(i=1; i<source->sources->nelts; i++) {
subsource = APR_ARRAY_IDX(source->sources,i,mapcache_source*);
mapcache_source_render_map(ctx, subsource, map);
if(GC_HAS_ERROR(ctx)) {
ctx->log(ctx,MAPCACHE_INFO,
"failed render on fallback source \"%s\" of tileset \"%s\". Continuing with other fallback sources if available",
subsource->name,map->tileset->name);
ctx->clear_errors(ctx);
continue;
} else {
return;
}
}
/* all backends failed, return primary error message */
ctx->set_error(ctx,first_error,"%s",first_error_message);
return;
}
}
void _mapcache_source_fallback_query(mapcache_context *ctx, mapcache_source *psource, mapcache_feature_info *fi)
{
mapcache_source_fallback *source = (mapcache_source_fallback*)psource;
mapcache_source *subsource;
int i;
subsource = APR_ARRAY_IDX(source->sources,0,mapcache_source*);
mapcache_source_query_info(ctx, subsource, fi);
if(GC_HAS_ERROR(ctx)) {
int first_error = ctx->get_error(ctx);
char *first_error_message = ctx->get_error_message(ctx);
ctx->log(ctx,MAPCACHE_INFO,
"failed query_info on primary source \"%s\" on tileset \"%s\". Falling back on secondary sources",
subsource->name,fi->map.tileset->name);
ctx->clear_errors(ctx);
for(i=1; i<source->sources->nelts; i++) {
subsource = APR_ARRAY_IDX(source->sources,i,mapcache_source*);
mapcache_source_query_info(ctx, subsource, fi);
if(GC_HAS_ERROR(ctx)) {
ctx->log(ctx,MAPCACHE_INFO,
"failed query_info on fallback source \"%s\" of tileset \"%s\". Continuing with other fallback sources if available",
subsource->name,fi->map.tileset->name);
ctx->clear_errors(ctx);
continue;
} else {
return;
}
}
/* all backends failed, return primary error message */
ctx->set_error(ctx,first_error,"%s",first_error_message);
return;
}
ctx->set_error(ctx,500,"fallback source does not support queries");
}
/**
* \private \memberof mapcache_source_fallback
* \sa mapcache_source::configuration_parse()
*/
void _mapcache_source_fallback_configuration_parse_xml(mapcache_context *ctx, ezxml_t node, mapcache_source *psource, mapcache_cfg *config)
{
ezxml_t cur_node;
mapcache_source_fallback *source = (mapcache_source_fallback*)psource;
source->sources = apr_array_make(ctx->pool,3,sizeof(mapcache_source*));
for(cur_node = ezxml_child(node,"source"); cur_node; cur_node = cur_node->next) {
mapcache_source *refsource = mapcache_configuration_get_source(config, cur_node->txt);
if(!refsource) {
ctx->set_error(ctx, 400, "fallback source \"%s\" references source \"%s\","
" but it is not configured (hint:referenced sources must be declared before this fallback source in the xml file)", psource->name, cur_node->txt);
return;
}
APR_ARRAY_PUSH(source->sources,mapcache_source*) = refsource;
}
if(source->sources->nelts == 0) {
ctx->set_error(ctx,400,"fallback source \"%s\" does not reference any child sources", psource->name);
}
}
/**
* \private \memberof mapcache_source_fallback
* \sa mapcache_source::configuration_check()
*/
void _mapcache_source_fallback_configuration_check(mapcache_context *ctx, mapcache_cfg *cfg,
mapcache_source *source)
{
}
mapcache_source* mapcache_source_fallback_create(mapcache_context *ctx)
{
mapcache_source_fallback *source = apr_pcalloc(ctx->pool, sizeof(mapcache_source_fallback));
if(!source) {
ctx->set_error(ctx, 500, "failed to allocate fallback source");
return NULL;
}
mapcache_source_init(ctx, &(source->source));
source->source.type = MAPCACHE_SOURCE_FALLBACK;
source->source._render_map = _mapcache_source_fallback_render_map;
source->source.configuration_check = _mapcache_source_fallback_configuration_check;
source->source.configuration_parse_xml = _mapcache_source_fallback_configuration_parse_xml;
source->source._query_info = _mapcache_source_fallback_query;
return (mapcache_source*)source;
}
/* vim: ts=2 sts=2 et sw=2
*/
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