1 /* This file is part of Pazpar2.
2 Copyright (C) 2006-2010 Index Data
4 Pazpar2 is free software; you can redistribute it and/or modify it under
5 the terms of the GNU General Public License as published by the Free
6 Software Foundation; either version 2, or (at your option) any later
9 Pazpar2 is distributed in the hope that it will be useful, but WITHOUT ANY
10 WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 // This module implements a generic system of settings
21 // (attribute-value) that can be associated with search targets. The
22 // system supports both default values, per-target overrides, and
33 #include <sys/types.h>
38 #include <libxml/parser.h>
39 #include <libxml/tree.h>
48 // Used for initializing setting_dictionary with pazpar2-specific settings
49 static char *hard_settings[] = {
74 struct setting_dictionary
81 // This establishes the precedence of wildcard expressions
82 #define SETTING_WILDCARD_NO 0 // No wildcard
83 #define SETTING_WILDCARD_DB 1 // Database wildcard 'host:port/*'
84 #define SETTING_WILDCARD_YES 2 // Complete wildcard '*'
86 // Returns size of settings directory
87 int settings_num(struct conf_service *service)
89 return service->dictionary->num;
92 static int settings_lookup(struct conf_service *service, const char *name,
98 struct setting_dictionary *dictionary = service->dictionary;
102 if (!strncmp("pz:", name, 3) && (p = strchr(name + 3, ':')))
103 maxlen = (p - name) + 1;
105 maxlen = strlen(name) + 1;
106 for (i = 0; i < dictionary->num; i++)
107 if (!strncmp(name, dictionary->dict[i], maxlen))
111 if (!strncmp("pz:", name, 3))
112 yaz_log(YLOG_WARN, "Adding pz-type setting name %s", name);
113 if (dictionary->num + 1 > dictionary->size)
116 nmem_malloc(service->nmem, dictionary->size * 2 * sizeof(char*));
117 memcpy(tmp, dictionary->dict, dictionary->size * sizeof(char*));
118 dictionary->dict = tmp;
119 dictionary->size *= 2;
121 dictionary->dict[dictionary->num] = nmem_strdup(service->nmem, name);
122 dictionary->dict[dictionary->num][maxlen-1] = '\0';
123 return dictionary->num++;
126 int settings_create_offset(struct conf_service *service, const char *name)
128 return settings_lookup(service, name, 1);
131 int settings_lookup_offset(struct conf_service *service, const char *name)
133 return settings_lookup(service, name, 0);
136 char *settings_name(struct conf_service *service, int offset)
138 assert(offset < service->dictionary->num);
139 return service->dictionary->dict[offset];
142 static int isdir(const char *path)
146 if (stat(path, &st) < 0)
148 yaz_log(YLOG_FATAL|YLOG_ERRNO, "stat %s", path);
151 return st.st_mode & S_IFDIR;
154 // Read settings from an XML file, calling handler function for each setting
155 void settings_read_node_x(xmlNode *n,
157 void (*fun)(void *client_data,
158 struct setting *set))
160 xmlChar *namea, *targeta, *valuea, *usera, *precedencea;
162 namea = xmlGetProp(n, (xmlChar *) "name");
163 targeta = xmlGetProp(n, (xmlChar *) "target");
164 valuea = xmlGetProp(n, (xmlChar *) "value");
165 usera = xmlGetProp(n, (xmlChar *) "user");
166 precedencea = xmlGetProp(n, (xmlChar *) "precedence");
167 for (n = n->children; n; n = n->next)
169 if (n->type != XML_ELEMENT_NODE)
171 if (!strcmp((const char *) n->name, "set"))
173 char *name, *target, *value, *user, *precedence;
175 name = (char *) xmlGetProp(n, (xmlChar *) "name");
176 target = (char *) xmlGetProp(n, (xmlChar *) "target");
177 value = (char *) xmlGetProp(n, (xmlChar *) "value");
178 user = (char *) xmlGetProp(n, (xmlChar *) "user");
179 precedence = (char *) xmlGetProp(n, (xmlChar *) "precedence");
181 if ((!name && !namea) || (!value && !valuea) || (!target && !targeta))
183 yaz_log(YLOG_FATAL, "set must specify name, value, and target");
193 // Copy everything into a temporary buffer -- we decide
194 // later if we are keeping it.
196 set.precedence = atoi((char *) precedence);
197 else if (precedencea)
198 set.precedence = atoi((char *) precedencea);
202 strcpy(targetb, target);
204 strcpy(targetb, (const char *) targeta);
205 set.target = targetb;
209 strcpy(nameb, (const char *) namea);
212 strcpy(valueb, value);
214 strcpy(valueb, (const char *) valuea);
217 (*fun)(client_data, &set);
227 yaz_log(YLOG_FATAL, "Unknown element %s in settings file", (char*) n->name);
232 xmlFree(precedencea);
238 static void read_settings_file(const char *path,
240 void (*fun)(void *client_data,
241 struct setting *set))
243 xmlDoc *doc = xmlParseFile(path);
248 yaz_log(YLOG_FATAL, "Failed to parse %s", path);
251 n = xmlDocGetRootElement(doc);
252 settings_read_node_x(n, client_data, fun);
258 // Recursively read files or directories, invoking a
259 // callback for each one
260 static void read_settings(const char *path,
262 void (*fun)(void *client_data,
263 struct setting *set))
271 if (!(d = opendir(path)))
273 yaz_log(YLOG_FATAL|YLOG_ERRNO, "%s", path);
276 while ((de = readdir(d)))
279 if (*de->d_name == '.' || !strcmp(de->d_name, "CVS"))
281 sprintf(tmp, "%s/%s", path, de->d_name);
282 read_settings(tmp, client_data, fun);
286 else if ((dot = strrchr(path, '.')) && !strcmp(dot + 1, "xml"))
287 read_settings_file(path, client_data, fun);
290 // Determines if a ZURL is a wildcard, and what kind
291 static int zurl_wildcard(const char *zurl)
294 return SETTING_WILDCARD_NO;
296 return SETTING_WILDCARD_YES;
297 else if (*(zurl + strlen(zurl) - 1) == '*')
298 return SETTING_WILDCARD_DB;
300 return SETTING_WILDCARD_NO;
303 struct update_database_context {
305 struct conf_service *service;
308 void expand_settings_array(struct setting ***set_ar, int *num, int offset,
315 int i, n_num = offset + 10;
316 struct setting **n_ar = nmem_malloc(nmem, n_num * sizeof(*n_ar));
317 for (i = 0; i < *num; i++)
318 n_ar[i] = (*set_ar)[i];
319 for (; i < n_num; i++)
326 // This is called from grep_databases -- adds/overrides setting for a target
327 // This is also where the rules for precedence of settings are implemented
328 static void update_database(void *context, struct database *db)
330 struct setting *set = ((struct update_database_context *)
332 struct conf_service *service = ((struct update_database_context *)
337 // Is this the right database?
338 if (!match_zurl(db->url, set->target))
341 offset = settings_create_offset(service, set->name);
342 expand_settings_array(&db->settings, &db->num_settings, offset,
345 // First we determine if this setting is overriding any existing settings
346 // with the same name.
347 assert(offset < db->num_settings);
348 for (sp = &db->settings[offset]; *sp; )
349 if (!strcmp((*sp)->name, set->name))
351 if ((*sp)->precedence < set->precedence)
353 // We discard the value (nmem keeps track of the space)
354 *sp = (*sp)->next; // unlink value from existing setting
356 else if ((*sp)->precedence > set->precedence)
358 // Db contains a higher-priority setting. Abort search
361 else if (zurl_wildcard((*sp)->target) > zurl_wildcard(set->target))
363 // target-specific value trumps wildcard. Delete.
364 *sp = (*sp)->next; // unlink.....
366 else if (zurl_wildcard((*sp)->target) < zurl_wildcard(set->target))
367 // Db already contains higher-priority setting. Abort search
374 if (!*sp) // is null when there are no higher-priority settings, so we add one
376 struct setting *new = nmem_malloc(service->nmem, sizeof(*new));
378 memset(new, 0, sizeof(*new));
379 new->precedence = set->precedence;
380 new->target = nmem_strdup(service->nmem, set->target);
381 new->name = nmem_strdup(service->nmem, set->name);
382 new->value = nmem_strdup(service->nmem, set->value);
383 new->next = db->settings[offset];
384 db->settings[offset] = new;
388 // Callback -- updates database records with dictionary entries as appropriate
389 // This is used in pass 2 to assign name/value pairs to databases
390 static void update_databases(void *client_data, struct setting *set)
392 struct conf_service *service = (struct conf_service *) client_data;
393 struct update_database_context context;
395 context.service = service;
396 predef_grep_databases(&context, service, update_database);
399 // This simply copies the 'hard' (application-specific) settings
400 // to the settings dictionary.
401 static void initialize_hard_settings(struct conf_service *service)
403 struct setting_dictionary *dict = service->dictionary;
404 dict->dict = nmem_malloc(service->nmem, sizeof(hard_settings) - sizeof(char*));
405 dict->size = (sizeof(hard_settings) - sizeof(char*)) / sizeof(char*);
406 memcpy(dict->dict, hard_settings, dict->size * sizeof(char*));
407 dict->num = dict->size;
410 // Read any settings names introduced in service definition (config) and add to dictionary
411 // This is done now to avoid errors if user settings are declared in session overrides
412 static void initialize_soft_settings(struct conf_service *service)
416 for (i = 0; i < service->num_metadata; i++)
418 struct conf_metadata *md = &service->metadata[i];
420 if (md->setting == Metadata_setting_no)
423 settings_create_offset(service, md->name);
427 static void prepare_target_dictionary(void *client_data, struct setting *set)
429 struct conf_service *service = (struct conf_service *) client_data;
430 struct setting_dictionary *dictionary = service->dictionary;
435 // If target address is not wildcard, add the database
436 if (*set->target && !zurl_wildcard(set->target))
437 find_database(set->target, service);
439 // Determine if we already have a dictionary entry
440 if (!strncmp(set->name, "pz:", 3) && (p = strchr(set->name + 3, ':')))
442 for (i = 0; i < dictionary->num; i++)
443 if (!strcmp(dictionary->dict[i], set->name))
445 yaz_log(YLOG_WARN, "Setting '%s' not configured as metadata", set->name);
448 void init_settings(struct conf_service *service)
450 struct setting_dictionary *new;
452 assert(service->nmem);
454 new = nmem_malloc(service->nmem, sizeof(*new));
455 memset(new, 0, sizeof(*new));
456 service->dictionary = new;
457 initialize_hard_settings(service);
458 initialize_soft_settings(service);
461 void settings_read_file(struct conf_service *service, const char *path,
465 read_settings(path, service, prepare_target_dictionary);
467 read_settings(path, service, update_databases);
470 void settings_read_node(struct conf_service *service, xmlNode *n,
474 settings_read_node_x(n, service, prepare_target_dictionary);
476 settings_read_node_x(n, service, update_databases);
482 * c-file-style: "Stroustrup"
483 * indent-tabs-mode: nil
485 * vim: shiftwidth=4 tabstop=8 expandtab