[389-commits] [lib389] 03/05: Issue 74 - Advice users to set referint-update-delay to 0

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commit 3ad1f7f8f760314c1f14e6dedb59b34d253c68ac
Author: Ilias Stamatis <stamatis.iliass(a)gmail.com&gt;
Date:   Fri Jul 7 03:37:16 2017 +0300

    Issue 74 - Advice users to set referint-update-delay to 0
    
    Bug Description: Support for asynchronous referential integrity updates
    might be dropped in the future and the referint-update-delay attribute
    might become deprecated. We need to warn the users.
    
    Fix Description: Display a warning when the healthcheck command is
    issued and advise the user to set this attribute to 0.
    
    https://pagure.io/lib389/issue/74
    
    Author: Ilias95
    
    Review by: wibrown (Thanks!)
---
 lib389/cli_conf/health.py        |  2 ++
 lib389/lint.py                   | 20 ++++++++++++++++++++
 lib389/plugins.py                |  8 ++++++++
 lib389/tests/healthcheck_test.py | 19 +++++++++++++++++++
 4 files changed, 49 insertions(+)

diff --git a/lib389/cli_conf/health.py b/lib389/cli_conf/health.py
index 02aef14..21c41bc 100644
--- a/lib389/cli_conf/health.py
+++ b/lib389/cli_conf/health.py
@@ -10,6 +10,7 @@ import argparse
 
 from lib389.backend import Backend, Backends
 from lib389.config import Encryption, Config
+from lib389 import plugins
 
 # These get all instances, then check them all.
 CHECK_MANY_OBJECTS = [
@@ -20,6 +21,7 @@ CHECK_MANY_OBJECTS = [
 CHECK_OBJECTS = [
     Config,
     Encryption,
+    plugins.ReferentialIntegrityPlugin
 ]
 
 def _format_check_output(log, result):
diff --git a/lib389/lint.py b/lib389/lint.py
index 404cff8..8c4b4de 100644
--- a/lib389/lint.py
+++ b/lib389/lint.py
@@ -108,4 +108,24 @@ set cn=encryption,cn=config sslVersionMin to a version greater than
TLS1.0
     """
 }
 
+DSRILE0001 = {
+    'dsle': 'DSRLE0001',
+    'severity': 'LOW',
+    'items' : ['cn=referential integrity
postoperation,cn=plugins,cn=config', ],
+    'detail': """
+The referential integrity plugin has an asynchronous processing mode. This is controlled
by the update-delay flag.
+
+When this value is 0, referential integrity plugin processes these changes inside of the
operation that modified the entry - ie these are synchronous.
+
+However, when this is > 0, these are performed asynchronously.
+
+This leads to only having refint enabled on one master in MMR to prevent replication
conflicts and loops.
+Additionally, because these are performed in the background these updates may cause
spurious update
+delays to your server by batching changes rather than smaller updates during sync
processing.
 
+We advise that you set this value to 0, and enable refint on all masters as it provides a
more predictable behaviour.
+    """,
+    'fix' : """
+Set referint-update-delay to 0.
+    """
+}
diff --git a/lib389/plugins.py b/lib389/plugins.py
index 6bbf164..944d130 100644
--- a/lib389/plugins.py
+++ b/lib389/plugins.py
@@ -12,6 +12,7 @@ import copy
 from lib389 import tasks
 from lib389._mapped_object import DSLdapObjects, DSLdapObject
 from lib389.exceptions import Error
+from lib389.lint import DSRILE0001
 from lib389._constants import DN_PLUGIN
 from lib389.properties import (
         PLUGINS_OBJECTCLASS_VALUE, PLUGIN_PROPNAME_TO_ATTRNAME,
@@ -119,6 +120,13 @@ class ManagedEntriesPlugin(Plugin):
 class ReferentialIntegrityPlugin(Plugin):
     def __init__(self, instance, dn="cn=referential integrity
postoperation,cn=plugins,cn=config", batch=False):
         super(ReferentialIntegrityPlugin, self).__init__(instance, dn, batch)
+        self._lint_functions = [self._lint_update_delay]
+
+    def _lint_update_delay(self):
+        if self.status():
+            delay = self.get_attr_val_int("referint-update-delay")
+            if delay is not None and delay != 0:
+                return DSRILE0001
 
     # referint-update-delay: 0
     # referint-logfile: /opt/dirsrv/var/log/dirsrv/slapd-standalone_2/referint
diff --git a/lib389/tests/healthcheck_test.py b/lib389/tests/healthcheck_test.py
index 94711eb..a36e6fb 100644
--- a/lib389/tests/healthcheck_test.py
+++ b/lib389/tests/healthcheck_test.py
@@ -11,6 +11,7 @@ import pytest
 import ldap
 
 from lib389.topologies import topology_st
+from lib389.plugins import ReferentialIntegrityPlugin
 
 from lib389.lint import *
 
@@ -40,3 +41,21 @@ def test_hc_config(topology_st):
     result = topology_st.standalone.config._lint_passwordscheme()
     assert result == DSCLE0002
 
+def test_hc_referint(topology_st):
+    plugin = ReferentialIntegrityPlugin(topology_st.standalone)
+    plugin.enable()
+
+    # Assert we don't get an error when delay is 0.
+    plugin.set('referint-update-delay', '0')
+    result = plugin._lint_update_delay()
+    assert result is None
+
+    # Assert we get an error when delay is not 0.
+    plugin.set('referint-update-delay', '10')
+    result = plugin._lint_update_delay()
+    assert result == DSRILE0001
+
+    # Assert we don't get an error when plugin is disabled.
+    plugin.disable()
+    result = plugin._lint_update_delay()
+    assert result is None

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