1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
|
/******************************************************************************
*
* Project: MapServer
* Purpose: MapCache tile caching: fallback cache backend.
* 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 fallbackriction, 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"
static int _mapcache_cache_fallback_tile_exists(mapcache_context *ctx, mapcache_cache *pcache, mapcache_tile *tile)
{
mapcache_cache_fallback *cache = (mapcache_cache_fallback*)pcache;
mapcache_cache *subcache = APR_ARRAY_IDX(cache->caches,0,mapcache_cache*);
return subcache->tile_exists(ctx, subcache, tile);
}
static void _mapcache_cache_fallback_tile_delete(mapcache_context *ctx, mapcache_cache *pcache, mapcache_tile *tile)
{
mapcache_cache_fallback *cache = (mapcache_cache_fallback*)pcache;
int i;
for(i=0; i<cache->caches->nelts; i++) {
mapcache_cache *subcache = APR_ARRAY_IDX(cache->caches,i,mapcache_cache*);
subcache->tile_delete(ctx, subcache, tile);
ctx->clear_errors(ctx); /* ignore errors */
}
}
/**
* \brief get content of given tile
*
* fills the mapcache_tile::data of the given tile with content stored on the fallback server
* \private \memberof mapcache_cache_fallback
* \sa mapcache_cache::tile_get()
*/
static int _mapcache_cache_fallback_tile_get(mapcache_context *ctx, mapcache_cache *pcache, mapcache_tile *tile)
{
mapcache_cache_fallback *cache = (mapcache_cache_fallback*)pcache;
mapcache_cache *subcache;
int i,ret;
subcache = APR_ARRAY_IDX(cache->caches,0,mapcache_cache*);
ret = subcache->tile_get(ctx, subcache, tile);
if(ret == MAPCACHE_FAILURE) {
int first_error = ctx->get_error(ctx);
char *first_error_message = ctx->get_error_message(ctx);
ctx->log(ctx,MAPCACHE_DEBUG,"failed \"GET\" on primary cache \"%s\" for tile (z=%d,x=%d,y=%d) of tileset \"%s\". Falling back on secondary caches",
APR_ARRAY_IDX(cache->caches,0,mapcache_cache*)->name,tile->z,tile->x,tile->y,tile->tileset->name);
ctx->clear_errors(ctx);
for(i=1; i<cache->caches->nelts; i++) {
subcache = APR_ARRAY_IDX(cache->caches,i,mapcache_cache*);
if((ret = subcache->tile_get(ctx, subcache, tile)) == MAPCACHE_FAILURE) {
ctx->log(ctx,MAPCACHE_DEBUG,"failed \"GET\" on fallback cache \"%s\" for tile (z=%d,x=%d,y=%d) of tileset \"%s\". Continuing with other fallback caches if available",
APR_ARRAY_IDX(cache->caches,0,mapcache_cache*)->name,tile->z,tile->x,tile->y,tile->tileset->name);
ctx->clear_errors(ctx);
continue;
} else {
return ret;
}
}
/* all backends failed, return primary error message */
ctx->set_error(ctx,first_error,first_error_message);
return MAPCACHE_FAILURE;
} else {
/* success or notfound */
return ret;
}
}
static void _mapcache_cache_fallback_tile_set(mapcache_context *ctx, mapcache_cache *pcache, mapcache_tile *tile)
{
mapcache_cache_fallback *cache = (mapcache_cache_fallback*)pcache;
int i,oneok=0,first_error=0;
char *first_error_message;
for(i=0; i<cache->caches->nelts; i++) {
mapcache_cache *subcache = APR_ARRAY_IDX(cache->caches,i,mapcache_cache*);
subcache->tile_set(ctx, subcache, tile);
if(GC_HAS_ERROR(ctx)) {
if(!first_error) {
first_error = ctx->get_error(ctx);
first_error_message = ctx->get_error_message(ctx);
}
ctx->log(ctx,MAPCACHE_DEBUG,"failed \"SET\" on subcache \"%s\" for tile (z=%d,x=%d,y=%d) of tileset \"%s\"",
APR_ARRAY_IDX(cache->caches,i,mapcache_cache*)->name,tile->z,tile->x,tile->y,tile->tileset->name);
ctx->clear_errors(ctx);
} else {
oneok = 1;
}
}
if(!oneok) {
ctx->set_error(ctx,first_error,first_error_message);
}
}
static void _mapcache_cache_fallback_tile_multi_set(mapcache_context *ctx, mapcache_cache *pcache, mapcache_tile *tiles, int ntiles)
{
mapcache_cache_fallback *cache = (mapcache_cache_fallback*)pcache;
int i,oneok=0,first_error=0;
char *first_error_message;
for(i=0; i<cache->caches->nelts; i++) {
mapcache_cache *subcache = APR_ARRAY_IDX(cache->caches,i,mapcache_cache*);
if(subcache->tile_multi_set) {
subcache->tile_multi_set(ctx, subcache, tiles, ntiles);
}
else {
int j;
for(j=0;j<ntiles;j++) {
subcache->tile_set(ctx,subcache,&tiles[j]);
if(GC_HAS_ERROR(ctx))
break;
}
}
if(GC_HAS_ERROR(ctx)) {
if(!first_error) {
first_error = ctx->get_error(ctx);
first_error_message = ctx->get_error_message(ctx);
}
ctx->log(ctx,MAPCACHE_DEBUG,"failed \"MULTISET\" on subcache \"%s\" for tile (z=%d,x=%d,y=%d) of tileset \"%s\"",
APR_ARRAY_IDX(cache->caches,i,mapcache_cache*)->name,tiles[0].z,tiles[0].x,tiles[0].y,tiles[0].tileset->name);
ctx->clear_errors(ctx);
} else {
oneok = 1;
}
}
if(!oneok) {
ctx->set_error(ctx,first_error,first_error_message);
}
}
/**
* \private \memberof mapcache_cache_fallback
*/
static void _mapcache_cache_fallback_configuration_parse_xml(mapcache_context *ctx, ezxml_t node, mapcache_cache *pcache, mapcache_cfg *config)
{
ezxml_t cur_node;
mapcache_cache_fallback *cache = (mapcache_cache_fallback*)pcache;
cache->caches = apr_array_make(ctx->pool,3,sizeof(mapcache_cache*));
for(cur_node = ezxml_child(node,"cache"); cur_node; cur_node = cur_node->next) {
mapcache_cache *refcache = mapcache_configuration_get_cache(config, cur_node->txt);
if(!refcache) {
ctx->set_error(ctx, 400, "fallback cache \"%s\" references cache \"%s\","
" but it is not configured (hint:referenced caches must be declared before this fallback cache in the xml file)", pcache->name, cur_node->txt);
return;
}
APR_ARRAY_PUSH(cache->caches,mapcache_cache*) = refcache;
}
if(cache->caches->nelts == 0) {
ctx->set_error(ctx,400,"fallback cache \"%s\" does not reference any child caches", pcache->name);
}
}
/**
* \private \memberof mapcache_cache_fallback
*/
static void _mapcache_cache_fallback_configuration_post_config(mapcache_context *ctx, mapcache_cache *cache,
mapcache_cfg *cfg)
{
}
/**
* \brief creates and initializes a mapcache_cache_fallback
*/
mapcache_cache* mapcache_cache_fallback_create(mapcache_context *ctx)
{
mapcache_cache_fallback *cache = apr_pcalloc(ctx->pool,sizeof(mapcache_cache_fallback));
if(!cache) {
ctx->set_error(ctx, 500, "failed to allocate fallback cache");
return NULL;
}
cache->cache.metadata = apr_table_make(ctx->pool,3);
cache->cache.type = MAPCACHE_CACHE_COMPOSITE;
cache->cache.tile_delete = _mapcache_cache_fallback_tile_delete;
cache->cache.tile_get = _mapcache_cache_fallback_tile_get;
cache->cache.tile_exists = _mapcache_cache_fallback_tile_exists;
cache->cache.tile_set = _mapcache_cache_fallback_tile_set;
cache->cache.tile_multi_set = _mapcache_cache_fallback_tile_multi_set;
cache->cache.configuration_post_config = _mapcache_cache_fallback_configuration_post_config;
cache->cache.configuration_parse_xml = _mapcache_cache_fallback_configuration_parse_xml;
return (mapcache_cache*)cache;
}
|
