1 /* This file is part of Pazpar2.
2 Copyright (C) 2006-2011 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>
34 #include <yaz/dirent.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[] = {
70 "pz:negotiation_charset",
72 "pz:reuse_connections",
73 "pz:termlist_term_factor",
83 struct setting_dictionary
90 // This establishes the precedence of wildcard expressions
91 #define SETTING_WILDCARD_NO 0 // No wildcard
92 #define SETTING_WILDCARD_DB 1 // Database wildcard 'host:port/*'
93 #define SETTING_WILDCARD_YES 2 // Complete wildcard '*'
95 // Returns size of settings directory
96 int settings_num(struct conf_service *service)
98 return service->dictionary->num;
101 static int settings_lookup(struct conf_service *service, const char *name,
107 struct setting_dictionary *dictionary = service->dictionary;
111 if (!strncmp("pz:", name, 3) && (p = strchr(name + 3, ':')))
112 maxlen = (p - name) + 1;
114 maxlen = strlen(name) + 1;
115 for (i = 0; i < dictionary->num; i++)
116 if (!strncmp(name, dictionary->dict[i], maxlen))
120 if (!strncmp("pz:", name, 3))
121 yaz_log(YLOG_WARN, "Adding pz-type setting name %s", name);
122 if (dictionary->num + 1 > dictionary->size)
125 nmem_malloc(service->nmem, dictionary->size * 2 * sizeof(char*));
126 memcpy(tmp, dictionary->dict, dictionary->size * sizeof(char*));
127 dictionary->dict = tmp;
128 dictionary->size *= 2;
130 dictionary->dict[dictionary->num] = nmem_strdup(service->nmem, name);
131 dictionary->dict[dictionary->num][maxlen-1] = '\0';
132 return dictionary->num++;
135 int settings_create_offset(struct conf_service *service, const char *name)
137 return settings_lookup(service, name, 1);
140 int settings_lookup_offset(struct conf_service *service, const char *name)
142 return settings_lookup(service, name, 0);
145 char *settings_name(struct conf_service *service, int offset)
147 assert(offset < service->dictionary->num);
148 return service->dictionary->dict[offset];
151 static int isdir(const char *path)
155 if (stat(path, &st) < 0)
157 yaz_log(YLOG_FATAL|YLOG_ERRNO, "stat %s", path);
160 return st.st_mode & S_IFDIR;
163 // Read settings from an XML file, calling handler function for each setting
164 void settings_read_node_x(xmlNode *n,
166 void (*fun)(void *client_data,
167 struct setting *set))
169 xmlChar *namea, *targeta, *valuea, *usera, *precedencea;
171 namea = xmlGetProp(n, (xmlChar *) "name");
172 targeta = xmlGetProp(n, (xmlChar *) "target");
173 valuea = xmlGetProp(n, (xmlChar *) "value");
174 usera = xmlGetProp(n, (xmlChar *) "user");
175 precedencea = xmlGetProp(n, (xmlChar *) "precedence");
176 for (n = n->children; n; n = n->next)
178 if (n->type != XML_ELEMENT_NODE)
180 if (!strcmp((const char *) n->name, "set"))
182 char *name, *target, *value, *user, *precedence;
184 name = (char *) xmlGetProp(n, (xmlChar *) "name");
185 target = (char *) xmlGetProp(n, (xmlChar *) "target");
186 value = (char *) xmlGetProp(n, (xmlChar *) "value");
187 user = (char *) xmlGetProp(n, (xmlChar *) "user");
188 precedence = (char *) xmlGetProp(n, (xmlChar *) "precedence");
190 if ((!name && !namea) || (!value && !valuea) || (!target && !targeta))
192 yaz_log(YLOG_FATAL, "set must specify name, value, and target");
202 // Copy everything into a temporary buffer -- we decide
203 // later if we are keeping it.
205 set.precedence = atoi((char *) precedence);
206 else if (precedencea)
207 set.precedence = atoi((char *) precedencea);
211 strcpy(targetb, target);
213 strcpy(targetb, (const char *) targeta);
214 set.target = targetb;
218 strcpy(nameb, (const char *) namea);
221 strcpy(valueb, value);
223 strcpy(valueb, (const char *) valuea);
226 (*fun)(client_data, &set);
236 yaz_log(YLOG_FATAL, "Unknown element %s in settings file", (char*) n->name);
241 xmlFree(precedencea);
247 static void read_settings_file(const char *path,
249 void (*fun)(void *client_data,
250 struct setting *set))
252 xmlDoc *doc = xmlParseFile(path);
257 yaz_log(YLOG_FATAL, "Failed to parse %s", path);
260 n = xmlDocGetRootElement(doc);
261 settings_read_node_x(n, client_data, fun);
267 // Recursively read files or directories, invoking a
268 // callback for each one
269 static void read_settings(const char *path,
271 void (*fun)(void *client_data,
272 struct setting *set))
280 if (!(d = opendir(path)))
282 yaz_log(YLOG_FATAL|YLOG_ERRNO, "%s", path);
285 while ((de = readdir(d)))
288 if (*de->d_name == '.' || !strcmp(de->d_name, "CVS"))
290 sprintf(tmp, "%s/%s", path, de->d_name);
291 read_settings(tmp, client_data, fun);
295 else if ((dot = strrchr(path, '.')) && !strcmp(dot + 1, "xml"))
296 read_settings_file(path, client_data, fun);
299 // Determines if a ZURL is a wildcard, and what kind
300 static int zurl_wildcard(const char *zurl)
303 return SETTING_WILDCARD_NO;
305 return SETTING_WILDCARD_YES;
306 else if (*(zurl + strlen(zurl) - 1) == '*')
307 return SETTING_WILDCARD_DB;
309 return SETTING_WILDCARD_NO;
312 struct update_database_context {
314 struct conf_service *service;
317 void expand_settings_array(struct setting ***set_ar, int *num, int offset,
324 int i, n_num = offset + 10;
325 struct setting **n_ar = nmem_malloc(nmem, n_num * sizeof(*n_ar));
326 for (i = 0; i < *num; i++)
327 n_ar[i] = (*set_ar)[i];
328 for (; i < n_num; i++)
335 // This is called from grep_databases -- adds/overrides setting for a target
336 // This is also where the rules for precedence of settings are implemented
337 static void update_database_fun(void *context, struct database *db)
339 struct setting *set = ((struct update_database_context *)
341 struct conf_service *service = ((struct update_database_context *)
346 // Is this the right database?
347 if (!match_zurl(db->url, set->target))
350 offset = settings_create_offset(service, set->name);
351 expand_settings_array(&db->settings, &db->num_settings, offset,
354 // First we determine if this setting is overriding any existing settings
355 // with the same name.
356 assert(offset < db->num_settings);
357 for (sp = &db->settings[offset]; *sp; )
358 if (!strcmp((*sp)->name, set->name))
360 if ((*sp)->precedence < set->precedence)
362 // We discard the value (nmem keeps track of the space)
363 *sp = (*sp)->next; // unlink value from existing setting
365 else if ((*sp)->precedence > set->precedence)
367 // Db contains a higher-priority setting. Abort search
370 else if (zurl_wildcard((*sp)->target) > zurl_wildcard(set->target))
372 // target-specific value trumps wildcard. Delete.
373 *sp = (*sp)->next; // unlink.....
375 else if (zurl_wildcard((*sp)->target) < zurl_wildcard(set->target))
376 // Db already contains higher-priority setting. Abort search
383 if (!*sp) // is null when there are no higher-priority settings, so we add one
385 struct setting *new = nmem_malloc(service->nmem, sizeof(*new));
387 memset(new, 0, sizeof(*new));
388 new->precedence = set->precedence;
389 new->target = nmem_strdup(service->nmem, set->target);
390 new->name = nmem_strdup(service->nmem, set->name);
391 new->value = nmem_strdup(service->nmem, set->value);
392 new->next = db->settings[offset];
393 db->settings[offset] = new;
397 // Callback -- updates database records with dictionary entries as appropriate
398 // This is used in pass 2 to assign name/value pairs to databases
399 static void update_databases(void *client_data, struct setting *set)
401 struct conf_service *service = (struct conf_service *) client_data;
402 struct update_database_context context;
404 context.service = service;
405 predef_grep_databases(&context, service, update_database_fun);
408 // This simply copies the 'hard' (application-specific) settings
409 // to the settings dictionary.
410 static void initialize_hard_settings(struct conf_service *service)
412 struct setting_dictionary *dict = service->dictionary;
413 dict->dict = nmem_malloc(service->nmem, sizeof(hard_settings) - sizeof(char*));
414 dict->size = (sizeof(hard_settings) - sizeof(char*)) / sizeof(char*);
415 memcpy(dict->dict, hard_settings, dict->size * sizeof(char*));
416 dict->num = dict->size;
419 // Read any settings names introduced in service definition (config) and add to dictionary
420 // This is done now to avoid errors if user settings are declared in session overrides
421 static void initialize_soft_settings(struct conf_service *service)
425 for (i = 0; i < service->num_metadata; i++)
427 struct conf_metadata *md = &service->metadata[i];
429 if (md->setting == Metadata_setting_no)
432 settings_create_offset(service, md->name);
436 static void prepare_target_dictionary(void *client_data, struct setting *set)
438 struct conf_service *service = (struct conf_service *) client_data;
439 struct setting_dictionary *dictionary = service->dictionary;
444 // If target address is not wildcard, add the database
445 if (*set->target && !zurl_wildcard(set->target))
446 create_database_for_service(set->target, service);
448 // Determine if we already have a dictionary entry
449 if (!strncmp(set->name, "pz:", 3) && (p = strchr(set->name + 3, ':')))
451 for (i = 0; i < dictionary->num; i++)
452 if (!strcmp(dictionary->dict[i], set->name))
454 yaz_log(YLOG_WARN, "Setting '%s' not configured as metadata", set->name);
457 void init_settings(struct conf_service *service)
459 struct setting_dictionary *new;
461 assert(service->nmem);
463 new = nmem_malloc(service->nmem, sizeof(*new));
464 memset(new, 0, sizeof(*new));
465 service->dictionary = new;
466 initialize_hard_settings(service);
467 initialize_soft_settings(service);
470 void settings_read_file(struct conf_service *service, const char *path,
474 read_settings(path, service, prepare_target_dictionary);
476 read_settings(path, service, update_databases);
479 void settings_read_node(struct conf_service *service, xmlNode *n,
483 settings_read_node_x(n, service, prepare_target_dictionary);
485 settings_read_node_x(n, service, update_databases);
491 * c-file-style: "Stroustrup"
492 * indent-tabs-mode: nil
494 * vim: shiftwidth=4 tabstop=8 expandtab