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Red Hat Bugzilla – Attachment 308278 Details for
Bug 436837
Dynamically reload schema via task interface
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New file: ldapserver/ldap/servers/plugins/schema_reload/schema_reload.c
schema_reload.c (text/plain), 9.73 KB, created by
Noriko Hosoi
on 2008-06-03 18:50:06 UTC
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Description:
New file: ldapserver/ldap/servers/plugins/schema_reload/schema_reload.c
Filename:
MIME Type:
Creator:
Noriko Hosoi
Created:
2008-06-03 18:50:06 UTC
Size:
9.73 KB
patch
obsolete
>/** BEGIN COPYRIGHT BLOCK > * This Program is free software; you can redistribute it and/or modify it under > * the terms of the GNU General Public License as published by the Free Software > * Foundation; version 2 of the License. > * > * This Program is distributed in the hope that it will be useful, but WITHOUT > * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS > * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. > * > * You should have received a copy of the GNU General Public License along with > * this Program; if not, write to the Free Software Foundation, Inc., 59 Temple > * Place, Suite 330, Boston, MA 02111-1307 USA. > * > * In addition, as a special exception, Red Hat, Inc. gives You the additional > * right to link the code of this Program with code not covered under the GNU > * General Public License ("Non-GPL Code") and to distribute linked combinations > * including the two, subject to the limitations in this paragraph. Non-GPL Code > * permitted under this exception must only link to the code of this Program > * through those well defined interfaces identified in the file named EXCEPTION > * found in the source code files (the "Approved Interfaces"). The files of > * Non-GPL Code may instantiate templates or use macros or inline functions from > * the Approved Interfaces without causing the resulting work to be covered by > * the GNU General Public License. Only Red Hat, Inc. may make changes or > * additions to the list of Approved Interfaces. You must obey the GNU General > * Public License in all respects for all of the Program code and other code used > * in conjunction with the Program except the Non-GPL Code covered by this > * exception. If you modify this file, you may extend this exception to your > * version of the file, but you are not obligated to do so. If you do not wish to > * provide this exception without modification, you must delete this exception > * statement from your version and license this file solely under the GPL without > * exception. > * > * Copyright (C) 2008 Red Hat, Inc. > * All rights reserved. > * END COPYRIGHT BLOCK **/ > >#ifdef HAVE_CONFIG_H ># include <config.h> >#endif > >/* > * Dynamic schema file reload plugin > * > * plugin entry in dse.ldif > * dn: cn=Schema Reload,cn=plugins,cn=config > * objectClass: top > * objectClass: nsSlapdPlugin > * objectClass: extensibleObject > * cn: Schema Reload > * nsslapd-pluginPath: libschemareload-plugin > * nsslapd-pluginInitfunc: schemareload_init > * nsslapd-pluginType: object > * nsslapd-pluginEnabled: on > * nsslapd-pluginId: schemareload > * nsslapd-pluginVersion: <plugin_version> > * nsslapd-pluginVendor: <vendor name> > * nsslapd-pluginDescription: task plugin to reload schema files > * > * config task entry in dse.ldif (registered in schemareload_start) > * dn: cn=schema reload task, cn=tasks, cn=config > * objectClass: top > * objectClass: extensibleObject > * cn: schema reload task > * > * To invoke the sample task, run the command line: > * $ ldapmodify -h <host> -p <port> -D "cn=Directory Manager" -w <pw> -a > * dn: cn=schema reload task 0, cn=schema reload task, cn=tasks, cn=config > * objectClass: top > * objectClass: extensibleObject > * cn: schema reload task 0 > * [ schemadir: path to reload files from ] > */ > >#include "slapi-plugin.h" >#include "nspr.h" >#include "dirver.h" /* PRODUCTTEXT */ >#include <dirlite_strings.h> /* PLUGIN_MAGIC_VENDOR_STR */ > >static PRLock *schemareload_lock = NULL; > >static Slapi_PluginDesc pdesc = { "schemareload", > PLUGIN_MAGIC_VENDOR_STR, PRODUCTTEXT, > "task plugin to reload schema files" }; > >static int schemareload_add(Slapi_PBlock *pb, Slapi_Entry *e, > Slapi_Entry *eAfter, int *returncode, char *returntext, > void *arg); >static int schemareload_start(Slapi_PBlock *pb); > >/* > * Init function > * Specified in the plugin entry as "nsslapd-pluginInitfunc: schemareload_init" > */ >int >schemareload_init( Slapi_PBlock *pb ) >{ > int rc = 0; > schemareload_lock = PR_NewLock(); > if (NULL == schemareload_lock) { > slapi_log_error(SLAPI_LOG_FATAL, "schemareload", > "Failed to create global schema reload lock."); > return rc; > } > rc = slapi_pblock_set( pb, SLAPI_PLUGIN_VERSION, > (void *) SLAPI_PLUGIN_VERSION_03 ); > rc |= slapi_pblock_set( pb, SLAPI_PLUGIN_DESCRIPTION, > (void *)&pdesc ); > rc |= slapi_pblock_set( pb, SLAPI_PLUGIN_START_FN, > (void *) schemareload_start ); > > return rc; >} > >/* > * Task start function > * Register the function schemareload_add, which invokes the task on demand. > */ >static int >schemareload_start(Slapi_PBlock *pb) >{ > int rc = slapi_task_register_handler("schema reload task", schemareload_add); > return rc; >} > >/* > * Task thread > * This is the heart of the reload-schema-file task: > * - calling the schema APIs to validate the schema files, > * - reloading them if the files are valid. > * Not necessary be a thread, but it'd not disturb the server's other jobs. > */ >static void >schemareload_thread(void *arg) >{ > Slapi_Task *task = (Slapi_Task *)arg; > int i, rv = 0; > int total_work = 2; > /* fetch our argument from the task */ > char *schemadir = (char *)slapi_task_get_data(task); > > /* update task state to show it's running */ > slapi_task_begin(task, total_work); > PR_Lock(schemareload_lock); /* make schema reload serialized */ > slapi_task_log_notice(task, "Schema reload task starts (schema dir: %s) ...\n", schemadir?schemadir:"default"); > slapi_log_error(SLAPI_LOG_FATAL, "schemareload", "Schema reload task starts (schema dir: %s) ...\n", schemadir?schemadir:"default"); > > rv = slapi_validate_schema_files(schemadir); > slapi_task_inc_progress(task); > > if (LDAP_SUCCESS == rv) { > slapi_task_log_notice(task, "Schema validation passed."); > slapi_task_log_status(task, "Schema validation passed."); > slapi_log_error(SLAPI_LOG_FATAL, "schemareload", "Schema validation passed.\n"); > > rv = slapi_reload_schema_files(schemadir); > slapi_task_inc_progress(task); > > /* update task state to say we're finished */ > if (LDAP_SUCCESS == rv) { > slapi_task_log_notice(task, "Schema reload task finished."); > slapi_task_log_status(task, "Schema reload task finished."); > slapi_log_error(SLAPI_LOG_FATAL, "schemareload", "Schema reload task finished.\n"); > } else { > slapi_task_log_notice(task, "Schema reload task failed."); > slapi_task_log_status(task, "Schema reload task failed."); > slapi_log_error(SLAPI_LOG_FATAL, "schemareload", "Schema reload task failed.\n"); > } > PR_Unlock(schemareload_lock); > } else { > slapi_task_log_notice(task, "Schema validation failed."); > slapi_task_log_status(task, "Schema validation failed."); > slapi_log_error(SLAPI_LOG_FATAL, "schemareload", "Schema validation failed.\n"); > PR_Unlock(schemareload_lock); > } > > /* this will queue the destruction of the task */ > slapi_task_finish(task, rv); >} > >/* extract a single value from the entry (as a string) -- if it's not in the > * entry, the default will be returned (which can be NULL). > * you do not need to free anything returned by this. > */ >static const char *fetch_attr(Slapi_Entry *e, const char *attrname, > const char *default_val) >{ > Slapi_Attr *attr; > Slapi_Value *val = NULL; > > if (slapi_entry_attr_find(e, attrname, &attr) != 0) > return default_val; > slapi_attr_first_value(attr, &val); > return slapi_value_get_string(val); >} > >static void >schemareload_destructor(Slapi_Task *task) >{ > if (task) { > char *schemadir = (char *)slapi_task_get_data(task); > slapi_ch_free_string(&schemadir); > } >} > >/* > * Invoked when the task instance is added by the client (step 5 of the comment) > * Get the necessary attributes from the task entry, and spawns a thread to do > * the task. > */ >static int >schemareload_add(Slapi_PBlock *pb, Slapi_Entry *e, > Slapi_Entry *eAfter, int *returncode, char *returntext, > void *arg) >{ > PRThread *thread = NULL; > const char *cn; > int rv = SLAPI_DSE_CALLBACK_OK; > Slapi_PBlock *mypb = NULL; > Slapi_Task *task = NULL; > char *schemadir = NULL; > > *returncode = LDAP_SUCCESS; > if ((cn = fetch_attr(e, "cn", NULL)) == NULL) { > *returncode = LDAP_OBJECT_CLASS_VIOLATION; > rv = SLAPI_DSE_CALLBACK_ERROR; > goto out; > } > > /* get arg(s) */ > schemadir = fetch_attr(e, "schemadir", NULL); > > /* allocate new task now */ > task = slapi_new_task(slapi_entry_get_ndn(e)); > if (task == NULL) { > slapi_log_error(SLAPI_LOG_FATAL, "schemareload", "unable to allocate new task!\n"); > *returncode = LDAP_OPERATIONS_ERROR; > rv = SLAPI_DSE_CALLBACK_ERROR; > goto out; > } > > /* set a destructor that will clean up schemadir for us when the task is complete */ > slapi_task_set_destructor_fn(task, schemareload_destructor); > > /* Stash our argument in the task for use by the task thread */ > slapi_task_set_data(task, slapi_ch_strdup(schemadir)); > > /* start the schema reload task as a separate thread */ > thread = PR_CreateThread(PR_USER_THREAD, schemareload_thread, > (void *)task, PR_PRIORITY_NORMAL, PR_GLOBAL_THREAD, > PR_UNJOINABLE_THREAD, SLAPD_DEFAULT_THREAD_STACKSIZE); > if (thread == NULL) { > slapi_log_error(SLAPI_LOG_FATAL, "schemareload", > "unable to create schema reload task thread!\n"); > *returncode = LDAP_OPERATIONS_ERROR; > rv = SLAPI_DSE_CALLBACK_ERROR; > slapi_task_finish(task, *returncode); > } else { > /* thread successful */ > rv = SLAPI_DSE_CALLBACK_OK; > } > >out: > return rv; >}
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bug 436837
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