s4-sites: Document, fix under optimal coding, use exceptions

Autobuild-User: Matthieu Patou <mat@samba.org>
Autobuild-Date: Wed Nov  2 22:35:00 CET 2011 on sn-devel-104

2 files changed, 86 insertions, 22 deletions

diff --git a/source4/scripting/python/samba/netcmd/sites.py b/source4/scripting/python/samba/netcmd/sites.py
index a63b52442e..f5223db5f8 100644
--- a/source4/scripting/python/samba/netcmd/sites.py
+++ b/source4/scripting/python/samba/netcmd/sites.py
@@ -23,7 +23,7 @@
 
 import os
 from samba import sites
-from samba import Ldb
+from samba.samdb import SamDB
 from samba.auth import system_session
 from samba.netcmd import (
     Command,
@@ -42,20 +42,20 @@ class cmd_sites_create(Command):
     def run(self, sitename, sambaopts=None, credopts=None, versionopts=None):
         lp = sambaopts.get_loadparm()
         creds = credopts.get_credentials(lp, fallback_machine=True)
-        name = "sam.ldb"
-        path = lp.get("private dir")
-        url = os.path.join(path, name)
+        url =  lp.private_path("sam.ldb")
+
         if not os.path.exists(url):
             raise CommandError("secret database not found at %s " % url)
-        samdb = Ldb(url=url, session_info=system_session(),
-            credentials=creds, lp=lp)
+        samdb = SamDB(url=url, session_info=system_session(),
+                      credentials=creds, lp=lp)
 
         samdb.transaction_start()
-        ok = sites.create_site(samdb, samdb.get_config_basedn(), sitename)
-        samdb.transaction_commit()
-
-        if not ok:
-            raise CommandError("Error while creating site %s" % sitename)
+        try:
+            ok = sites.create_site(samdb, samdb.get_config_basedn(), sitename)
+            samdb.transaction_commit()
+        except sites.SiteAlreadyExistsException, e:
+            samdb.transaction_cancel()
+            raise CommandError("Error while creating site %s, error: %s" % (sitename, str(e)))
 
         self.outf.write("Site %s created !\n" % sitename)
 
@@ -69,20 +69,20 @@ class cmd_sites_delete(Command):
     def run(self, sitename, sambaopts=None, credopts=None, versionopts=None):
         lp = sambaopts.get_loadparm()
         creds = credopts.get_credentials(lp, fallback_machine=True)
-        name = "sam.ldb"
-        path = lp.get("private dir")
-        url = os.path.join(path, name)
+        url =  lp.private_path("sam.ldb")
+
         if not os.path.exists(url):
             raise CommandError("secret database not found at %s " % url)
-        samdb = Ldb(url=url, session_info=system_session(),
+        samdb = SamDB(url=url, session_info=system_session(),
             credentials=creds, lp=lp)
 
         samdb.transaction_start()
-        ok = sites.delete_site(samdb, samdb.get_config_basedn(), sitename)
-        samdb.transaction_commit()
-
-        if not ok:
-            raise CommandError("Error while creating site %s" % sitename)
+        try:
+            ok = sites.delete_site(samdb, samdb.get_config_basedn(), sitename)
+            samdb.transaction_commit()
+        except sites.SiteException, e:
+            samdb.transaction_cancel()
+            raise CommandError("Error while removing site %s, error: %s" % (sitename, str(e)))
 
         self.outf.write("Site %s removed!\n" % sitename)
 
diff --git a/source4/scripting/python/samba/sites.py b/source4/scripting/python/samba/sites.py
index d1d0e75973..f18441cbbb 100644
--- a/source4/scripting/python/samba/sites.py
+++ b/source4/scripting/python/samba/sites.py
@@ -22,11 +22,59 @@
 import ldb
 from ldb import FLAG_MOD_ADD
 
+
+class SiteException(Exception):
+    """Base element for Sites errors"""
+
+    def __init__(self, value):
+        self.value = value
+
+    def __str__(self):
+        return "SiteException: " + self.value
+
+
+class SiteNotFoundException(SiteException):
+    """Raised when the site is not found and it's expected to exists."""
+
+    def __init__(self, value):
+        self.value = value
+
+    def __str__(self):
+        return "SiteNotFoundException: " + self.value
+
+class SiteAlreadyExistsException(SiteException):
+    """Raised when the site is not found and it's expected not to exists."""
+
+    def __init__(self, value):
+        self.value = value
+
+    def __str__(self):
+        return "SiteAlreadyExists: " + self.value
+
+class SiteServerNotEmptyException(SiteException):
+    """Raised when the site still has servers attached."""
+
+    def __init__(self, value):
+        self.value = value
+
+    def __str__(self):
+        return "SiteServerNotEmpty: " + self.value
+
 def create_site(samdb, configDn, siteName):
+    """
+    Create a site
+
+    :param samdb: A samdb connection
+    :param configDn: The DN of the configuration partition
+    :param siteName: Name of the site to create
+    :return: True upon success
+    :raise SiteAlreadyExists: if the site to be created already exists.
+    """
+
     ret = samdb.search(base=configDn, scope=ldb.SCOPE_SUBTREE,
                     expression='(&(objectclass=Site)(cn=%s))' % siteName)
     if len(ret) != 0:
-        raise Exception('A site with the name %s already exists' % siteName)
+        raise SiteAlreadyExistsException('A site with the name %s already exists' % siteName)
 
     m = ldb.Message()
     m.dn = ldb.Dn(samdb, "Cn=%s,CN=Sites,%s" % (siteName, str(configDn)))
@@ -49,14 +97,30 @@ def create_site(samdb, configDn, siteName):
     return True
 
 def delete_site(samdb, configDn, siteName):
+    """
+    Delete a site
 
+    :param samdb: A samdb connection
+    :param configDn: The DN of the configuration partition
+    :param siteName: Name of the site to delete
+    :return: True upon success
+    :raise SiteNotFoundException: if the site to be deleted do not exists.
+    :raise SiteServerNotEmpty: if the site has still servers in it.
+    """
+
+    dnsites = ldb.Dn(samdb, "CN=Sites,%s" % (str(configDn)))
     dnsite = ldb.Dn(samdb, "Cn=%s,CN=Sites,%s" % (siteName, str(configDn)))
     dnserver = ldb.Dn(samdb, "Cn=Servers,%s" % str(dnsite))
 
+    ret = samdb.search(base=dnsites, scope=ldb.SCOPE_ONELEVEL,
+                    expression='(dn=%s)' % str(dnsite))
+    if len(ret) != 1:
+        raise SiteNotFoundException('Site %s do not exists' % siteName)
+
     ret = samdb.search(base=dnserver, scope=ldb.SCOPE_ONELEVEL,
                     expression='(objectclass=server)')
     if len(ret) != 0:
-        raise Exception('Site %s still has servers in it, move them before removal' % siteName)
+        raise SiteServerNotEmptyException('Site %s still has servers in it, move them before removal' % siteName)
 
     samdb.delete(dnsite, ["tree_delete:0"])