Fix attempted write to attribute of read-only object.

Add new class "cachedproperty" for creating property-like attributes
that cache the return value of a method call.

Also fix few issues in the unit tests to enable them to succeed.

ticket 1959

ipalib/dn.py

@@ -1092,7 +1092,7 @@ class DN(object):
                 return rdns
         elif isinstance(value, (tuple, list)):
             if len(value) != 2:
-                raise ValueError("tuple or list must be 2-valued, not \"%s\"" % (rdn))
+                raise ValueError("tuple or list must be 2-valued, not \"%s\"" % (value))
             rdn = RDN(value, first_key_match=self.first_key_match)
             return rdn
         else:

ipalib/errors.py

@@ -448,10 +448,10 @@ class RefererError(PublicError):
 
     For example:
 
-    >>> raise RefererError()
+    >>> raise RefererError(referer='referer')
     Traceback (most recent call last):
       ...
-    RefererError: Missing or invalid HTTP Referer
+    RefererError: Missing or invalid HTTP Referer, referer
     """
 
     errno = 911
@@ -1537,7 +1537,7 @@ class DependentEntry(ExecutionError):
     >>> raise DependentEntry(label=u'SELinux User Map', key=u'test', dependent=u'test1')
     Traceback (most recent call last):
       ...
-    DependentEntry: Not registered yet
+    DependentEntry: test cannot be deleted because SELinux User Map test1 requires it
 
     """
 

ipalib/util.py

@@ -27,6 +27,7 @@ import time
 import socket
 import re
 from types import NoneType
+from weakref import WeakKeyDictionary
 
 from ipalib import errors
 from ipalib.text import _
@@ -272,3 +273,36 @@ def validate_hostname(hostname):
     if not all(regex_name.match(part) for part in hostname.split(".")):
         raise ValueError(_('hostname parts may only include letters, numbers, and - ' \
                            '(which is not allowed as the last character)'))
+
+class cachedproperty(object):
+    """
+    A property-like attribute that caches the return value of a method call.
+
+    When the attribute is first read, the method is called and its return
+    value is saved and returned. On subsequent reads, the saved value is
+    returned.
+
+    Typical usage:
+    class C(object):
+        @cachedproperty
+        def attr(self):
+            return 'value'
+    """
+    __slots__ = ('getter', 'store')
+
+    def __init__(self, getter):
+        self.getter = getter
+        self.store = WeakKeyDictionary()
+
+    def __get__(self, obj, cls):
+        if obj is None:
+            return None
+        if obj not in self.store:
+            self.store[obj] = self.getter(obj)
+        return self.store[obj]
+
+    def __set__(self, obj, value):
+        raise AttributeError("can't set attribute")
+
+    def __delete__(self, obj):
+        raise AttributeError("can't delete attribute")

ipaserver/install/ldapupdate.py

@@ -700,7 +700,7 @@ class LDAPUpdate:
                     self.conn.deleteEntry(dn)
                 self.modified = True
             except errors.NotFound, e:
-                root_logger.info("%s did not exist:%s", (dn, e))
+                root_logger.info("%s did not exist:%s", dn, e)
                 self.modified = True
             except errors.DatabaseError, e:
                 root_logger.error("Delete failed: %s", e)
@@ -717,7 +717,7 @@ class LDAPUpdate:
                         self.conn.deleteEntry(dn)
                     self.modified = True
                 except errors.NotFound, e:
-                    root_logger.info("%s did not exist:%s", (dn, e))
+                    root_logger.info("%s did not exist:%s", dn, e)
                     self.modified = True
                 except errors.DatabaseError, e:
                     root_logger.error("Delete failed: %s", e)

ipaserver/ipaldap.py

@@ -314,7 +314,7 @@ class IPAdmin(IPAEntryLDAPObject):
             raise errors.DuplicateEntry()
         except ldap.CONSTRAINT_VIOLATION, e:
             # This error gets thrown by the uniqueness plugin
-            if info == 'Another entry with the same attribute value already exists':
+            if info.startswith('Another entry with the same attribute value already exists'):
                 raise errors.DuplicateEntry()
             else:
                 raise errors.DatabaseError(desc=desc,info=info)

ipaserver/plugins/dogtag.py

@@ -1200,6 +1200,7 @@ import os, random, ldap
 from ipaserver.plugins import rabase
 from ipalib.errors import NetworkError, CertificateOperationError
 from ipalib.constants import TYPE_ERROR
+from ipalib.util import cachedproperty
 from ipapython import dogtag
 from ipalib import _
 
@@ -1218,7 +1219,6 @@ class ra(rabase.rabase):
         self.ipa_key_size = "2048"
         self.ipa_certificate_nickname = "ipaCert"
         self.ca_certificate_nickname = "caCert"
-        self.ca_host = None
         try:
             f = open(self.pwd_file, "r")
             self.password = f.readline().strip()
@@ -1266,7 +1266,8 @@ class ra(rabase.rabase):
             pass
         return None
 
-    def _select_ca(self):
+    @cachedproperty
+    def ca_host(self):
         """
         :return:   host
                    as str
@@ -1293,8 +1294,6 @@ class ra(rabase.rabase):
 
         Perform an HTTP request.
         """
-        if self.ca_host == None:
-            self.ca_host = self._select_ca()
         return dogtag.http_request(self.ca_host, port, url, **kw)
 
     def _sslget(self, url, port, **kw):
@@ -1306,9 +1305,6 @@ class ra(rabase.rabase):
 
         Perform an HTTPS request
         """
-
-        if self.ca_host == None:
-            self.ca_host = self._select_ca()
         return dogtag.https_request(self.ca_host, port, url, self.sec_dir, self.password, self.ipa_certificate_nickname, **kw)
 
     def get_parse_result_xml(self, xml_text, parse_func):

ipaserver/plugins/ldap2.py

@@ -210,7 +210,7 @@ def _handle_errors(e, **kw):
         raise errors.DuplicateEntry()
     except _ldap.CONSTRAINT_VIOLATION:
         # This error gets thrown by the uniqueness plugin
-        if info == 'Another entry with the same attribute value already exists':
+        if info.startswith('Another entry with the same attribute value already exists'):
             raise errors.DuplicateEntry()
         else:
             raise errors.DatabaseError(desc=desc, info=info)

tests/test_ipalib/test_plugable.py

@@ -247,7 +247,7 @@ class test_Plugin(ClassChecker):
             info = 'whatever'
         e = raises(StandardError, check)
         assert str(e) == \
-            "check.info attribute ('whatever') conflicts with Plugin logger"
+            "info is already bound to tests.test_ipalib.test_plugable.check()"
 
     def test_set_api(self):
         """

tests/test_ipaserver/test_ldap.py

@@ -112,7 +112,15 @@ class test_ldap(object):
         myapi.register(service)
         myapi.register(service_show)
         myapi.finalize()
-        myapi.Backend.ldap2.connect(bind_dn="cn=Directory Manager", bind_pw='password')
+
+        pwfile = api.env.dot_ipa + os.sep + ".dmpw"
+        if ipautil.file_exists(pwfile):
+            fp = open(pwfile, "r")
+            dm_password = fp.read().rstrip()
+            fp.close()
+        else:
+            raise nose.SkipTest("No directory manager password in %s" % pwfile)
+        myapi.Backend.ldap2.connect(bind_dn="cn=Directory Manager", bind_pw=dm_password)
 
         result = myapi.Command['service_show']('ldap/%s@%s' %  (api.env.host, api.env.realm,))
         entry_attrs = result['result']