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# coding: utf8
import re
import time
import json
import base64
import hashlib
#import procpy
#*************************************************************************
class DBConn (object):
"""
This class wraps SQLite resp. MySQL commands to the database manipulation commands
needed from datastore.DBObj.
"""
def __init__ (self,coordinates={'type':'sqlite'}):
"""
TODO
"""
if coordinates['type'] == 'sqlite':
import sqlite3
self.dbh = sqlite3.connect(coordinates['name'])
self.dbh.row_factory = sqlite3.Row
self.standard_placeholder = '?'
self.index_length = ''
if coordinates['type'] == 'mysql':
import MySQLdb
self.dbh = MySQLdb.connect(coordinates['host'],
coordinates['user'],
coordinates['pass'],
coordinates['db'],charset='utf8'
)
self.standard_placeholder = '%s'
self.index_length = '(80)'
cursor = self.dbh.cursor()
try:
cursor.execute("create table entries ("
+ "MD5KEY CHAR(25) UNIQUE,"
+ "OBJID VARCHAR(50) UNIQUE,"
+ "OBJCLASS TEXT,"
+ "SLEEP TEXT,"
+ "WAKETIME TEXT,"
+ "JUMP TEXT)"
)
except:
pass
try:
cursor.execute("create index md5keyidx on entries (MD5KEY)")
except:
pass
try:
cursor.execute("create index objididx on entries (OBJID)")
except:
pass
self.dbh.commit()
#*************************************************************************
def commit (self):
self.dbh.commit()
#*************************************************************************
def delete_object (self,md5key):
cursor = self.dbh.cursor()
nr = cursor.execute("delete from entries where MD5KEY like '" + md5key + "%'")
return(nr)
#*************************************************************************
def upsert_hold_backs (self):
erg = False
if 'hold_back' in vars(self):
for entry in self.hold_back:
self.upsert_extend(entry)
erg = True
self.hold_back = []
return(erg)
#*************************************************************************
def upsert_extend (self,entry,delete_mode=0):
if 'OBJID' in entry:
m = re.search(r"^(\D*)(9+)(\D*)$",entry['OBJID'])
if m:
entry['OBJID'] = m.group(1) + ( ("%0"+str(len(m.group(2)))+"u") % 1 ) + m.group(3)
if not 'hold_back' in vars(self):
self.hold_back = []
self.hold_back.append(dict(entry))
return()
while 0 == 0:
md5key = self.upsert(entry,delete_mode)
if md5key:
return(md5key)
if not 'OBJID' in entry:
return(False)
m = re.search(r"(.*?)(\d+)(.*)$",entry['OBJID'])
if m:
entry['OBJID'] = m.group(1) + ( ("%0"+str(len(m.group(2)))+"u") % (int(m.group(2))+1) ) + m.group(3)
else:
entry['OBJID'] = entry['OBJID'] + "001"
#*************************************************************************
def upsert (self,entry,delete_mode=0):
placeholders = [self.standard_placeholder,self.standard_placeholder]
field_list = []
entry_values = []
md5new = []
for field in entry: # transfer the entry into the database
if field == 'MD5KEY':
md5key = entry[field]
else:
if type(entry[field]).__name__ in ["str","int","unicode","float","long"]:
dumpdata = str(entry[field])
else:
dumpdata = json.dumps(entry[field],sort_keys=True,indent=4,ensure_ascii=False)
field_list.append(self.mask(field))
entry_values.append(dumpdata)
placeholders.append(self.standard_placeholder)
if not field[0] == "_":
md5new.append(field+": "+dumpdata)
# print(123)
md5new.sort()
md5new = "".join(md5new)
md5new = re.sub(r"\n","",md5new,99999999)
md5new = re.sub(r"\f","",md5new,99999999)
md5new = re.sub(r"\r","",md5new,99999999)
md5new = re.sub(r"\t","",md5new,99999999)
md5new = re.sub(r" +"," ",md5new,99999999)
md5new = md5new.strip()
field_list.append('OBJDATA')
entry_values.append(md5new)
md5new = bytearray(md5new,'utf-8')
md5new = base64.b64encode(md5new)
md5new = hashlib.md5(md5new).digest()
md5new = base64.b64encode(md5new)
md5new = str(md5new,"utf-8") # bytearray.decode(md5new,encoding="utf-8")
md5new = re.sub(r"^(.*)\=\=$","\\1",md5new)
field_list.append('MD5KEY')
entry_values.append(md5new)
# print(124,md5new,md5key)
cursor = self.dbh.cursor()
if 'md5key' in vars(): # if there is a former MD5KEY
if md5new == md5key: # which is identical to the new one
# print(1240,md5new,md5key)
return(md5key) # the entry is exactly yet in the database
nr = cursor.execute("delete from entries where MD5KEY like '" + md5key + "%'")
# print(125)
if delete_mode > 0:
return(None)
text = "insert into entries (" + ",".join(field_list) + ") values (" + ",".join(placeholders) + ")"
# print(text)
while (0 == 0): # add columns as long as there are some missing
try:
if cursor.execute(text,entry_values):
# print "# change " + md5new
pass
break
except Exception as e:
# print str(e)
m = re.search(r"(Unknown +column .*?|no +column +named +)([A-Z0-9\_]+)",str(e))
if m:
o = m.group(2) # column extension
# print("# alter table entries add column " + o + " TEXT")
cursor.execute("alter table entries add column " + o + " TEXT")
if self.mask(o) == o:
cursor.execute("create index " + o + "idx on entries (" + o + self.index_length + ")")
else:
return(False) # if there is another error by touching the unique constraints in MD5KEY or OBJID
return(md5new)
#*************************************************************************
def query_data (self,md5key="",datafield="",fields="*"):
"""
Creates a database cursor which represents
a certain query against the table entries .
"""
cursor = self.dbh.cursor()
if md5key == "": # first mode, without any parameters. Select entries whose WAKETIME is reached.
cursor.execute("select " + fields + " from entries where " +
"WAKETIME < " + str(time.time()) + " and WAKETIME >= 0")
elif md5key == '___dryrun___': # ___dryrun___ mode, Select entries whithout respect of waketime
cursor.execute("select " + fields + " from entries where not JUMP == ''")
elif not datafield == "": # search against a special value in a given column
cursor.execute("select " + fields + " from entries where " + datafield + " ='" + md5key + "'")
# print("select " + fields + " from entries where " + datafield + " ='" + md5key + "'")
else:
sqlclause = "select " + fields + " from entries where " + md5key # proper SQL query clause
if not re.search(r"\=",sqlclause) and not re.search(r"like",sqlclause):
sqlclause = "xxxx"
try:
cursor.execute(sqlclause)
except Exception as e: # a special form of query: searching for
md5key = re.sub(r",","%' ) and ( OBJDATA like '%",md5key,9999) # <a1>,<a2>,<a3>~<b1>,<b2> means:
md5key = re.sub(r"~","%' ) or ( OBJDATA like '%",md5key,9999) # search for entries where the patterns
md5key = "( ( OBJDATA like '%" + md5key + "%' ) )" # <a1>, <a2> and <a3> OR the patterns
# print("select * from entries where " + md5key)
try: # <b1> and <b2> are contained in OBJDATA
cursor.execute("select * from entries where " + md5key)
except Exception as xxx_todo_changeme:
(e) = xxx_todo_changeme
print(md5key)
print(str(e))
return ( "\nNo valid sql expression:\n\n" + sqlclause + "\n" +
str(e) + "\n\nand also not valid short expression:"
"\n\n" + str(md5key) + "\n")
return(cursor)
#*************************************************************************
def next_obj (self,cursor,changer=None): # retrieving an object in mongo format
column_contents = cursor.fetchone()
if not column_contents:
return(None)
obj = {}
zaehler = -1
for column in column_contents:
zaehler = zaehler + 1
if not column:
continue
if cursor.description[zaehler][0] == "OBJDATA":
continue
try:
obj[ self.demask( cursor.description[zaehler][0] ) ] = json.loads(column)
except:
obj[ self.demask( cursor.description[zaehler][0] ) ] = column
if changer:
changer.run(obj)
return(obj)
#*************************************************************************
def lock_waketime (self,md5key,nr=0):
if nr == 0: # nicht exklusiver lock
nr = "(cast((cast(WAKETIME as int)+1) as str) ) where OBJID='"
elif nr == -1:
nr = "'-1' where PARENTID='"
else:
nr = "'-" + str(nr) + "' where (cast(WAKETIME as int)) >= 0 and MD5KEY='"
cursor = self.dbh.cursor()
cursor.execute("update entries set WAKETIME=" + nr + md5key + "'" )
# print("update entries set WAKETIME=" + nr + md5key + "'" )
locked = False
if cursor.rowcount == 1:
locked = True
self.dbh.commit()
return(locked)
#*************************************************************************
def mask (self,field):
field1 = ""
for o in field:
if o == "_" or not o == o.upper():
field1 = field1 + "_" + o.upper()
else:
field1 = field1 + o
return(field1)
#*************************************************************************
def demask (self,field):
field1 = ""
make_lower = False
for o in field:
if make_lower:
field1 = field1 + o.lower()
make_lower = False
else:
if o == "_":
make_lower = True
else:
field1 = field1 + o
return(field1)
#*************************************************************************
#*************************************************************************