perf(core): cache the schema of LDAP user sources

SoObjects/SOGo/LDAPSource.m

@@ -440,6 +440,8 @@ groupObjectClasses: (NSArray *) newGroupObjectClasses
 - (NGLdapConnection *) _ldapConnection
 {
   NGLdapConnection *ldapConnection;
+  NSString *value, *key;
+  SOGoCache *cache;
 
   NS_DURING
     {
@@ -459,7 +461,20 @@ groupObjectClasses: (NSArray *) newGroupObjectClasses
           if (!_schema)
             {
               _schema = [LDAPSourceSchema new];
-              [_schema readSchemaFromConnection: ldapConnection];
+              cache = [SOGoCache sharedCache];
+              key = [NSString stringWithFormat: @"schema:%@", _sourceID];
+              value = [cache valueForKey: key];
+
+              if (value)
+                {
+                  [_schema setSchema: (NSMutableDictionary *)[value objectFromJSONString]];
+                }
+              else
+                {
+                  // We go check in the LDAP directory
+                  [_schema readSchemaFromConnection: ldapConnection];
+                  [cache setValue: [_schema jsonRepresentation] forKey: key];
+                }
             }
         }
       else

SoObjects/SOGo/LDAPSourceSchema.h

@@ -1,8 +1,6 @@
 /* LDAPSourceSchema.h - this file is part of SOGo
  *
- * Copyright (C) 2011 Inverse inc
- *
- * Author: Wolfgang Sourdeau <wsourdeau@inverse.ca>
+ * Copyright (C) 2011-2021 Inverse inc
  *
  * This file is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -34,11 +32,15 @@
 
 - (void) readSchemaFromConnection: (NGLdapConnection *) conn;
 
+- (void) setSchema: (NSMutableDictionary *) newSchema;
+
 - (NSArray *) fieldsForClass: (NSString *) className;
 
 /* merged list of attributes with unique names */
 - (NSArray *) fieldsForClasses: (NSArray *) className;
 
+- (NSString *) jsonRepresentation;
+
 @end
 
 #endif /* LDAPSOURCESCHEMA_H */

SoObjects/SOGo/LDAPSourceSchema.m

@@ -1,8 +1,6 @@
 /* LDAPSourceSchema.m - this file is part of SOGo
  *
- * Copyright (C) 2011 Inverse inc
- *
- * Author: Wolfgang Sourdeau <wsourdeau@inverse.ca>
+ * Copyright (C) 2011-2021 Inverse inc
  *
  * This file is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -239,6 +237,12 @@ fillSchemaFromEntry (NSMutableDictionary *schema, NGLdapEntry *entry)
     }
 }
 
+- (void) setSchema: (NSMutableDictionary *) newSchema
+{
+  ASSIGN (schema, newSchema);
+  [schema release];
+}
+
 static void
 fillFieldsForClass (NSMutableDictionary *schema, NSString *schemaName,
                     NSMutableArray *fields)
@@ -289,4 +293,9 @@ fillFieldsForClass (NSMutableDictionary *schema, NSString *schemaName,
   return [fieldHash allKeys];
 }
 
+- (NSString *) jsonRepresentation
+{
+  return [schema jsonRepresentation];
+}
+
 @end