1 /* This file is part of Pazpar2.
2 Copyright (C) 2006-2009 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[] = {
72 struct setting_dictionary
79 // This establishes the precedence of wildcard expressions
80 #define SETTING_WILDCARD_NO 0 // No wildcard
81 #define SETTING_WILDCARD_DB 1 // Database wildcard 'host:port/*'
82 #define SETTING_WILDCARD_YES 2 // Complete wildcard '*'
84 // Returns size of settings directory
85 int settings_num(struct conf_service *service)
87 return service->dictionary->num;
90 int settings_offset(struct conf_service *service, const char *name)
96 for (i = 0; i < service->dictionary->num; i++)
97 if (!strcmp(name, service->dictionary->dict[i]))
102 // Ignores everything after second colon, if present
103 // A bit of a hack to support the pz:cclmap: scheme (and more to come?)
104 int settings_offset_cprefix(struct conf_service *service, const char *name)
110 if (!strncmp("pz:", name, 3) && (p = strchr(name + 3, ':')))
111 maxlen = (p - name) + 1;
112 for (i = 0; i < service->dictionary->num; i++)
113 if (!strncmp(name, service->dictionary->dict[i], maxlen))
118 char *settings_name(struct conf_service *service, int offset)
120 return service->dictionary->dict[offset];
123 static int isdir(const char *path)
127 if (stat(path, &st) < 0)
129 yaz_log(YLOG_FATAL|YLOG_ERRNO, "stat %s", path);
132 return st.st_mode & S_IFDIR;
135 // Read settings from an XML file, calling handler function for each setting
136 void settings_read_node_x(xmlNode *n,
138 void (*fun)(void *client_data,
139 struct setting *set))
141 xmlChar *namea, *targeta, *valuea, *usera, *precedencea;
143 namea = xmlGetProp(n, (xmlChar *) "name");
144 targeta = xmlGetProp(n, (xmlChar *) "target");
145 valuea = xmlGetProp(n, (xmlChar *) "value");
146 usera = xmlGetProp(n, (xmlChar *) "user");
147 precedencea = xmlGetProp(n, (xmlChar *) "precedence");
148 for (n = n->children; n; n = n->next)
150 if (n->type != XML_ELEMENT_NODE)
152 if (!strcmp((const char *) n->name, "set"))
154 char *name, *target, *value, *user, *precedence;
156 name = (char *) xmlGetProp(n, (xmlChar *) "name");
157 target = (char *) xmlGetProp(n, (xmlChar *) "target");
158 value = (char *) xmlGetProp(n, (xmlChar *) "value");
159 user = (char *) xmlGetProp(n, (xmlChar *) "user");
160 precedence = (char *) xmlGetProp(n, (xmlChar *) "precedence");
162 if ((!name && !namea) || (!value && !valuea) || (!target && !targeta))
164 yaz_log(YLOG_FATAL, "set must specify name, value, and target");
174 // Copy everything into a temporary buffer -- we decide
175 // later if we are keeping it.
177 set.precedence = atoi((char *) precedence);
178 else if (precedencea)
179 set.precedence = atoi((char *) precedencea);
183 strcpy(targetb, target);
185 strcpy(targetb, (const char *) targeta);
186 set.target = targetb;
190 strcpy(nameb, (const char *) namea);
193 strcpy(valueb, value);
195 strcpy(valueb, (const char *) valuea);
198 (*fun)(client_data, &set);
208 yaz_log(YLOG_FATAL, "Unknown element %s in settings file", (char*) n->name);
213 xmlFree(precedencea);
219 static void read_settings_file(const char *path,
221 void (*fun)(void *client_data,
222 struct setting *set))
224 xmlDoc *doc = xmlParseFile(path);
229 yaz_log(YLOG_FATAL, "Failed to parse %s", path);
232 n = xmlDocGetRootElement(doc);
233 settings_read_node_x(n, client_data, fun);
239 // Recursively read files or directories, invoking a
240 // callback for each one
241 static void read_settings(const char *path,
243 void (*fun)(void *client_data,
244 struct setting *set))
252 if (!(d = opendir(path)))
254 yaz_log(YLOG_FATAL|YLOG_ERRNO, "%s", path);
257 while ((de = readdir(d)))
260 if (*de->d_name == '.' || !strcmp(de->d_name, "CVS"))
262 sprintf(tmp, "%s/%s", path, de->d_name);
263 read_settings(tmp, client_data, fun);
267 else if ((dot = strrchr(path, '.')) && !strcmp(dot + 1, "xml"))
268 read_settings_file(path, client_data, fun);
271 // Determines if a ZURL is a wildcard, and what kind
272 static int zurl_wildcard(const char *zurl)
275 return SETTING_WILDCARD_NO;
277 return SETTING_WILDCARD_YES;
278 else if (*(zurl + strlen(zurl) - 1) == '*')
279 return SETTING_WILDCARD_DB;
281 return SETTING_WILDCARD_NO;
284 // Callback. Adds a new entry to the dictionary if necessary
285 // This is used in pass 1 to determine layout of dictionary
286 // and to load any databases mentioned
287 static void prepare_dictionary(struct conf_service *service,
290 struct setting_dictionary *dictionary = service->dictionary;
295 // Determine if we already have a dictionary entry
296 if (!strncmp(set->name, "pz:", 3) && (p = strchr(set->name + 3, ':')))
298 for (i = 0; i < dictionary->num; i++)
299 if (!strcmp(dictionary->dict[i], set->name))
302 if (!strncmp(set->name, "pz:", 3)) // Probably a typo in config file
304 yaz_log(YLOG_FATAL, "Unknown pz: setting '%s'", set->name);
308 // Create a new dictionary entry
309 // Grow dictionary if necessary
310 if (!dictionary->size)
312 nmem_malloc(service->nmem, (dictionary->size = 50) * sizeof(char*));
313 else if (dictionary->num + 1 > dictionary->size)
316 nmem_malloc(service->nmem, dictionary->size * 2 * sizeof(char*));
317 memcpy(tmp, dictionary->dict, dictionary->size * sizeof(char*));
318 dictionary->dict = tmp;
319 dictionary->size *= 2;
321 dictionary->dict[dictionary->num++] = nmem_strdup(service->nmem, set->name);
325 struct update_database_context {
327 struct conf_service *service;
330 // This is called from grep_databases -- adds/overrides setting for a target
331 // This is also where the rules for precedence of settings are implemented
332 static void update_database(void *context, struct database *db)
334 struct setting *set = ((struct update_database_context *)
336 struct conf_service *service = ((struct update_database_context *)
338 struct setting *s, **sp;
341 // Is this the right database?
342 if (!match_zurl(db->url, set->target))
345 if ((offset = settings_offset_cprefix(service, set->name)) < 0)
348 // First we determine if this setting is overriding any existing settings
349 // with the same name.
350 for (s = db->settings[offset], sp = &db->settings[offset]; s;
351 sp = &s->next, s = s->next)
352 if (!strcmp(s->name, set->name))
354 if (s->precedence < set->precedence)
355 // We discard the value (nmem keeps track of the space)
356 *sp = (*sp)->next; // unlink value from existing setting
357 else if (s->precedence > set->precedence)
358 // Db contains a higher-priority setting. Abort search
360 if (zurl_wildcard(s->target) > zurl_wildcard(set->target))
361 // target-specific value trumps wildcard. Delete.
362 *sp = (*sp)->next; // unlink.....
363 else if (!zurl_wildcard(s->target))
364 // Db already contains higher-priority setting. Abort search
367 if (!s) // s will be null when there are no higher-priority settings -- we add one
369 struct setting *new = nmem_malloc(service->nmem, sizeof(*new));
371 memset(new, 0, sizeof(*new));
372 new->precedence = set->precedence;
373 new->target = nmem_strdup(service->nmem, set->target);
374 new->name = nmem_strdup(service->nmem, set->name);
375 new->value = nmem_strdup(service->nmem, set->value);
376 new->next = db->settings[offset];
377 db->settings[offset] = new;
381 // Callback -- updates database records with dictionary entries as appropriate
382 // This is used in pass 2 to assign name/value pairs to databases
383 static void update_databases(void *client_data, struct setting *set)
385 struct conf_service *service = (struct conf_service *) client_data;
386 struct update_database_context context;
388 context.service = service;
389 predef_grep_databases(&context, service, 0, update_database);
392 // This simply copies the 'hard' (application-specific) settings
393 // to the settings dictionary.
394 static void initialize_hard_settings(struct conf_service *service)
396 struct setting_dictionary *dict = service->dictionary;
397 dict->dict = nmem_malloc(service->nmem, sizeof(hard_settings) - sizeof(char*));
398 dict->size = (sizeof(hard_settings) - sizeof(char*)) / sizeof(char*);
399 memcpy(dict->dict, hard_settings, dict->size * sizeof(char*));
400 dict->num = dict->size;
403 // Read any settings names introduced in service definition (config) and add to dictionary
404 // This is done now to avoid errors if user settings are declared in session overrides
405 static void initialize_soft_settings(struct conf_service *service)
409 for (i = 0; i < service->num_metadata; i++)
412 struct conf_metadata *md = &service->metadata[i];
414 if (md->setting == Metadata_setting_no)
422 prepare_dictionary(service, &set);
426 static void prepare_target_dictionary(void *client_data, struct setting *set)
428 struct conf_service *service = (struct conf_service *) client_data;
429 struct setting_dictionary *dictionary = service->dictionary;
434 // If target address is not wildcard, add the database
435 if (*set->target && !zurl_wildcard(set->target))
436 find_database(set->target, 0, service);
438 // Determine if we already have a dictionary entry
439 if (!strncmp(set->name, "pz:", 3) && (p = strchr(set->name + 3, ':')))
441 for (i = 0; i < dictionary->num; i++)
442 if (!strcmp(dictionary->dict[i], set->name))
444 yaz_log(YLOG_WARN, "Setting '%s' not configured as metadata", set->name);
447 void init_settings(struct conf_service *service)
449 struct setting_dictionary *new;
451 assert(service->nmem);
453 new = nmem_malloc(service->nmem, sizeof(*new));
454 memset(new, 0, sizeof(*new));
455 service->dictionary = new;
456 initialize_hard_settings(service);
457 initialize_soft_settings(service);
460 void settings_read_file(struct conf_service *service, const char *path,
464 read_settings(path, service, prepare_target_dictionary);
466 read_settings(path, service, update_databases);
469 void settings_read_node(struct conf_service *service, xmlNode *n,
473 settings_read_node_x(n, service, prepare_target_dictionary);
475 settings_read_node_x(n, service, update_databases);
481 * c-file-style: "Stroustrup"
482 * indent-tabs-mode: nil
484 * vim: shiftwidth=4 tabstop=8 expandtab