From ea8bafeb9a48ebaf8da9d69e107089cd26383e66 Mon Sep 17 00:00:00 2001
From: Nabin Hait <nabinhait@gmail.com>
Date: Fri, 14 Oct 2011 18:25:42 +0530
Subject: [PATCH] patch handler redesigned

---
 py/webnotes/modules/patch_handler.py | 92 ++++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 py/webnotes/modules/patch_handler.py

diff --git a/py/webnotes/modules/patch_handler.py b/py/webnotes/modules/patch_handler.py
new file mode 100644
index 0000000000..0c32101976
--- /dev/null
+++ b/py/webnotes/modules/patch_handler.py
@@ -0,0 +1,92 @@
+# patch manager
+#---------------
+
+import webnotes
+
+def run(patch_list, overwrite = 0, log_exception=1, conn = '', db_name = '', root_pwd = ''):
+	# db connection
+	if not conn:
+		connect_db(db_name, root_pwd)
+	else:
+		webnotes.conn = conn
+	
+	# session
+	if not webnotes.session:
+		webnotes.session = {'user':'Administrator'}
+
+	# no patches on accounts
+	if webnotes.conn.cur_db_name=='accounts':
+		return
+		
+	# check if already applied
+	if not overwrite:
+		patch_list = check_already_applied_patch(patch_list)
+			
+	for p in patch_list:
+		webnotes.conn.begin()
+				
+		# execute patch
+		execute_patch(p, log_exception)
+			
+		# update patch log table
+		webnotes.conn.sql("insert into `__PatchLog` (patch, applied_on) values (%s, now())", p)
+		
+		webnotes.conn.commit()
+		
+		print "Patch: %s applied successfully..." % p
+
+#-----------------------------------------------------
+def execute_patch(p, log_exception):
+	if log_exception:
+		try:
+			exec('from patches import ' + p)
+			eval(p).execute()
+		except Exception, e:
+			write_log()
+			webnotes.conn.rollback()
+			return
+	else:
+		exec('from patches import ' + p)
+		eval(p).execute()
+	
+#-----------------------------------------------------
+def check_already_applied_patch(patch_list):
+	"""
+		Remove if patch already applied
+	"""
+	webnotes.conn.sql("create table if not exists `__PatchLog` (patch TEXT, applied_on DATETIME)")
+	
+	already_patched = [d[0] for d in webnotes.conn.sql("select distinct patch from `__PatchLog`")]
+	pending_patch = []
+	
+	for p in patch_list:
+		if p not in already_patched:
+			pending_patch.append(p)
+
+	return pending_patch
+
+#-----------------------------------------------------
+def connect_db(db_name, pwd):
+	"""
+		Connect database
+	"""
+	import webnotes.db
+	webnotes.conn = webnotes.db.Database(user='root', password=pwd)
+	webnotes.conn.use(db_name)
+
+#-----------------------------------------------------
+def write_log():
+	import os
+	import webnotes.defs
+	import webnotes
+	
+	patch_log = open(os.path.join(webnotes.defs.modules_path, 'patches', 'patch.log'), 'a')
+	patch_log.write(('\n\nError in %s:\n' % webnotes.conn.cur_db_name) + webnotes.getTraceback())
+	patch_log.close()
+	
+	if getattr(webnotes.defs,'admin_email_notification',0):
+		from webnotes.utils import sendmail
+		subj = 'Patch Error. <br>Account: %s' % webnotes.conn.cur_db_name
+		msg = subj + '<br><br>' + webnotes.getTraceback()
+		print msg
+		#sendmail(['nabin@erpnext.com'], sender='automail@erpnext.com', subject= subj, parts=[['text/plain', msg]])