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| 1 | +/****************************************************************************** |
| 2 | + * $Id$ |
| 3 | + * |
| 4 | + * Project: MapServer |
| 5 | + * Purpose: MapCache tile caching support file: Mapserver Mapfile datasource |
| 6 | + * Author: Thomas Bonfort and the MapServer team. |
| 7 | + * |
| 8 | + ****************************************************************************** |
| 9 | + * Copyright (c) 1996-2011 Regents of the University of Minnesota. |
| 10 | + * |
| 11 | + * Permission is hereby granted, free of charge, to any person obtaining a |
| 12 | + * copy of this software and associated documentation files (the "Software"), |
| 13 | + * to deal in the Software without restriction, including without limitation |
| 14 | + * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| 15 | + * and/or sell copies of the Software, and to permit persons to whom the |
| 16 | + * Software is furnished to do so, subject to the following conditions: |
| 17 | + * |
| 18 | + * The above copyright notice and this permission notice shall be included in |
| 19 | + * all copies of this Software or works derived from this Software. |
| 20 | + * |
| 21 | + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
| 22 | + * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 23 | + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 24 | + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 25 | + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| 26 | + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
| 27 | + * DEALINGS IN THE SOFTWARE. |
| 28 | + *****************************************************************************/ |
| 29 | + |
| 30 | + |
| 31 | +#include "mapcache.h" |
| 32 | +#include "ezxml.h" |
| 33 | +#include <apr_tables.h> |
| 34 | +#include <apr_strings.h> |
| 35 | + |
| 36 | +typedef struct mapcache_source_fallback mapcache_source_fallback; |
| 37 | +struct mapcache_source_fallback { |
| 38 | + mapcache_source source; |
| 39 | + apr_array_header_t *sources; |
| 40 | +}; |
| 41 | + |
| 42 | +/** |
| 43 | + * \private \memberof mapcache_source_fallback |
| 44 | + * \sa mapcache_source::render_map() |
| 45 | + */ |
| 46 | +void _mapcache_source_fallback_render_map(mapcache_context *ctx, mapcache_source *psource, mapcache_map *map) |
| 47 | +{ |
| 48 | + mapcache_source_fallback *source = (mapcache_source_fallback*)psource; |
| 49 | + mapcache_source *subsource; |
| 50 | + int i; |
| 51 | + subsource = APR_ARRAY_IDX(source->sources,0,mapcache_source*); |
| 52 | + mapcache_source_render_map(ctx, subsource, map); |
| 53 | + |
| 54 | + if(GC_HAS_ERROR(ctx)) { |
| 55 | + int first_error = ctx->get_error(ctx); |
| 56 | + char *first_error_message = ctx->get_error_message(ctx); |
| 57 | + ctx->log(ctx,MAPCACHE_INFO, |
| 58 | + "failed render on primary source \"%s\" on tileset \"%s\". Falling back on secondary sources", |
| 59 | + subsource->name,map->tileset->name); |
| 60 | + ctx->clear_errors(ctx); |
| 61 | + for(i=1; i<source->sources->nelts; i++) { |
| 62 | + subsource = APR_ARRAY_IDX(source->sources,i,mapcache_source*); |
| 63 | + mapcache_source_render_map(ctx, subsource, map); |
| 64 | + if(GC_HAS_ERROR(ctx)) { |
| 65 | + ctx->log(ctx,MAPCACHE_INFO, |
| 66 | + "failed render on fallback source \"%s\" of tileset \"%s\". Continuing with other fallback sources if available", |
| 67 | + subsource->name,map->tileset->name); |
| 68 | + ctx->clear_errors(ctx); |
| 69 | + continue; |
| 70 | + } else { |
| 71 | + return; |
| 72 | + } |
| 73 | + } |
| 74 | + /* all backends failed, return primary error message */ |
| 75 | + ctx->set_error(ctx,first_error,first_error_message); |
| 76 | + return; |
| 77 | + } |
| 78 | +} |
| 79 | + |
| 80 | +void _mapcache_source_fallback_query(mapcache_context *ctx, mapcache_source *psource, mapcache_feature_info *fi) |
| 81 | +{ |
| 82 | + mapcache_source_fallback *source = (mapcache_source_fallback*)psource; |
| 83 | + mapcache_source *subsource; |
| 84 | + int i; |
| 85 | + subsource = APR_ARRAY_IDX(source->sources,0,mapcache_source*); |
| 86 | + mapcache_source_query_info(ctx, subsource, fi); |
| 87 | + |
| 88 | + if(GC_HAS_ERROR(ctx)) { |
| 89 | + int first_error = ctx->get_error(ctx); |
| 90 | + char *first_error_message = ctx->get_error_message(ctx); |
| 91 | + ctx->log(ctx,MAPCACHE_INFO, |
| 92 | + "failed query_info on primary source \"%s\" on tileset \"%s\". Falling back on secondary sources", |
| 93 | + subsource->name,fi->map.tileset->name); |
| 94 | + ctx->clear_errors(ctx); |
| 95 | + for(i=1; i<source->sources->nelts; i++) { |
| 96 | + subsource = APR_ARRAY_IDX(source->sources,i,mapcache_source*); |
| 97 | + mapcache_source_query_info(ctx, subsource, fi); |
| 98 | + if(GC_HAS_ERROR(ctx)) { |
| 99 | + ctx->log(ctx,MAPCACHE_INFO, |
| 100 | + "failed query_info on fallback source \"%s\" of tileset \"%s\". Continuing with other fallback sources if available", |
| 101 | + subsource->name,fi->map.tileset->name); |
| 102 | + ctx->clear_errors(ctx); |
| 103 | + continue; |
| 104 | + } else { |
| 105 | + return; |
| 106 | + } |
| 107 | + } |
| 108 | + /* all backends failed, return primary error message */ |
| 109 | + ctx->set_error(ctx,first_error,first_error_message); |
| 110 | + return; |
| 111 | + } |
| 112 | + ctx->set_error(ctx,500,"fallback source does not support queries"); |
| 113 | +} |
| 114 | + |
| 115 | +/** |
| 116 | + * \private \memberof mapcache_source_fallback |
| 117 | + * \sa mapcache_source::configuration_parse() |
| 118 | + */ |
| 119 | +void _mapcache_source_fallback_configuration_parse_xml(mapcache_context *ctx, ezxml_t node, mapcache_source *psource, mapcache_cfg *config) |
| 120 | +{ |
| 121 | + ezxml_t cur_node; |
| 122 | + mapcache_source_fallback *source = (mapcache_source_fallback*)psource; |
| 123 | + source->sources = apr_array_make(ctx->pool,3,sizeof(mapcache_source*)); |
| 124 | + for(cur_node = ezxml_child(node,"source"); cur_node; cur_node = cur_node->next) { |
| 125 | + mapcache_source *refsource = mapcache_configuration_get_source(config, cur_node->txt); |
| 126 | + if(!refsource) { |
| 127 | + ctx->set_error(ctx, 400, "fallback source \"%s\" references source \"%s\"," |
| 128 | + " but it is not configured (hint:referenced sources must be declared before this fallback source in the xml file)", psource->name, cur_node->txt); |
| 129 | + return; |
| 130 | + } |
| 131 | + APR_ARRAY_PUSH(source->sources,mapcache_source*) = refsource; |
| 132 | + } |
| 133 | + if(source->sources->nelts == 0) { |
| 134 | + ctx->set_error(ctx,400,"fallback source \"%s\" does not reference any child sources", psource->name); |
| 135 | + } |
| 136 | +} |
| 137 | + |
| 138 | +/** |
| 139 | + * \private \memberof mapcache_source_fallback |
| 140 | + * \sa mapcache_source::configuration_check() |
| 141 | + */ |
| 142 | +void _mapcache_source_fallback_configuration_check(mapcache_context *ctx, mapcache_cfg *cfg, |
| 143 | + mapcache_source *source) |
| 144 | +{ |
| 145 | +} |
| 146 | + |
| 147 | +mapcache_source* mapcache_source_fallback_create(mapcache_context *ctx) |
| 148 | +{ |
| 149 | + mapcache_source_fallback *source = apr_pcalloc(ctx->pool, sizeof(mapcache_source_fallback)); |
| 150 | + if(!source) { |
| 151 | + ctx->set_error(ctx, 500, "failed to allocate fallback source"); |
| 152 | + return NULL; |
| 153 | + } |
| 154 | + mapcache_source_init(ctx, &(source->source)); |
| 155 | + source->source.type = MAPCACHE_SOURCE_FALLBACK; |
| 156 | + source->source._render_map = _mapcache_source_fallback_render_map; |
| 157 | + source->source.configuration_check = _mapcache_source_fallback_configuration_check; |
| 158 | + source->source.configuration_parse_xml = _mapcache_source_fallback_configuration_parse_xml; |
| 159 | + source->source._query_info = _mapcache_source_fallback_query; |
| 160 | + return (mapcache_source*)source; |
| 161 | +} |
| 162 | + |
| 163 | + |
| 164 | +/* vim: ts=2 sts=2 et sw=2 |
| 165 | +*/ |
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