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#!/usr/bin/python
#Copyright (c) 2018 A. Mennucci
#License: GNU GPL v2
import os, sys, atexit, tempfile, subprocess
from os.path import join
from copy import copy
import time, string, shutil, pickle, lockfile, logging, logging.handlers
if sys.version_info.major == 2:
string_types = (str, unicode) # python2
from urllib import quote as urllib_quote
else:
string_types = (str, bytes) # python3
import urllib, urllib.parse
from urllib.parse import quote as urllib_quote
import sqlite3 as dbapi
logger=logging.getLogger(__name__)
#http://stackoverflow.com/questions/36932/how-can-i-represent-an-enum-in-python
#from enum import Enum
class Enum(object):
def __init__(self, *k):
pass
def enum(*enums):
d=dict([ (enums[k],k) for k in range(len(enums)) ])
return type('Enum', (object,), d)
if dbapi != None:
pass
# ===== sqlite machinery
#def convert_blob(s):
# return s #this is always a string
#
# Register the adapter
#sqlite.register_adapter(StringType, adapt_blob)
#
# Register the converter
#dbapi.register_converter("blob", convert_blob)
#dbapi.register_converter("text", convert_blob)
class SQL_queue(object):
dbname=None
sql_connection=None
sql_connection_add=None
fields=('id','priority','old_name','new_name','delta','forensic','other_info','ctime')
fields_enum=enum(*fields)
schema="""
create table deltas_queue (
id integer unique primary key autoincrement,
priority integer,
old_name text,
new_name text,
delta text,
forensic text,
other_info text,
ctime integer
) ;
CREATE INDEX IF NOT EXISTS deltas_queue_priority ON deltas_queue ( priority );
CREATE INDEX IF NOT EXISTS deltas_queue_delta ON deltas_queue ( delta ) ;
CREATE INDEX IF NOT EXISTS deltas_queue_ctime ON deltas_queue ( ctime ) ;
CREATE INDEX IF NOT EXISTS deltas_queue_priority_ctime ON deltas_queue ( priority, ctime ) ;
"""
def __init__(self,dbname):
assert type(dbname) in string_types
if not os.path.exists(dbname):
r=my_subprocess_Popen(['sqlite3',dbname], stdin=subprocess.PIPE)
r.stdin.write(self.schema)
r.stdin.close()
r.wait()
assert 0 == r.returncode
assert os.path.exists(dbname)
self.dbname=dbname
self.sql_connection = self._connect()
# will be created when needed
self.sql_connection_add = None
def _connect(self):
return dbapi.connect(self.dbname, isolation_level='EXCLUSIVE') # detect_types=dbapi.PARSE_DECLTYPES | dbapi.PARSE_COLNAMES)
def __del__(self):
if self.sql_connection != None:
self.sql_connection.close()
if self.sql_connection_add != None:
self.sql_connection_add.close()
def _get_connection_cursor(self):
connection = self.sql_connection
cursor = connection.cursor()
return connection, cursor
def queue_add_begin(self):
assert self.sql_connection_add == None
self.sql_connection_add = self._connect()
def queue_add(self, priority, old_name, new_name, delta, forensic, other_info='', ctime=None):
if self.sql_connection_add == None:
raise Exception(' should use queue_add_begin() before ')
if ctime==None:
ctime=int(time.time())
with self.sql_connection_add as S:
S.execute('INSERT INTO deltas_queue VALUES (null, ?, ?, ?, ?, ?, ?, ?)',\
(priority, old_name, new_name, delta, forensic, other_info, ctime))
S.commit()
def queue_add_commit(self):
self.sql_connection_add = None
def queue_peek(self):
conn,cursor = self._get_connection_cursor()
cursor.execute('SELECT * FROM deltas_queue ORDER BY priority , ctime LIMIT 1')
return cursor.fetchone()
def queue_get(self, id_):
conn,cursor = self._get_connection_cursor()
cursor.execute('SELECT * FROM deltas_queue WHERE id = ? ', (id_,))
return cursor.fetchone()
def queue_pop(self, id_=None):
"pop one value, if 'id' is set that value"
#http://stackoverflow.com/questions/15856976/transactions-with-python-sqlite3
connection, cursor = self._get_connection_cursor()
try:
connection.execute('begin exclusive transaction')
if id_ == None:
cursor.execute('SELECT * FROM deltas_queue ORDER BY priority , ctime LIMIT 1 ')
else:
cursor.execute('SELECT * FROM deltas_queue WHERE id = ? ', (id_,))
x=cursor.fetchone()
if x is not None:
id_ = x[0]
connection.execute('DELETE FROM deltas_queue where id = ? ', (id_,))
connection.commit()
#cursor.execute('commit transaction')
except:
connection.rollback()
#cursor.execute('rollback')
raise
return x
def queue_del(self, id_):
"delete queued item by 'id'"
connection, cursor = self._get_connection_cursor()
try:
cursor.execute('DELETE FROM deltas_queue where id = ? ', (id_,))
connection.commit() #cursor.executescript('commit transaction')
except:
connection.rollback() #cursor.executescript('rollback')
raise
def iterate(self):
"returns a cursor onto the database"
connection, cursor = self._get_connection_cursor()
cursor.execute('SELECT * FROM deltas_queue ORDER BY priority , ctime')
return cursor
def queue_peek_delta(self, delta):
conn,cursor = self._get_connection_cursor()
cursor.execute('SELECT * FROM deltas_queue WHERE delta = ?', (delta, ))
return cursor.fetchone()
_html_top="""<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<link rel="StyleSheet" href="style.css" type="text/css">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>debdeltas Server History Page</title>
</head>
<body>
"""
def html(db,W):
s=SQL_queue(db)
if type(W) in string_types:
W=open(W,'w').write
W(_html_top)
W('Queue state at '+time.ctime()+'\n')
F=list(SQL_queue.fields)
FE=SQL_queue.fields_enum
W('<table class="queue"><tr>')
for j in F:
W('<th>' + j.replace('_',' ')+'</th>')
W('</tr>\n')
count=0
for x in s.iterate():
count+=1
x=list(x)
x=[('%.3f' % j) if isinstance(j,float) else j for j in x]
x=[(j.split('/')[-1]) if (type(j) in string_types) else j for j in x]
x=['' if (j == None) else j for j in x]
x[FE.ctime]=time.ctime(x[FE.ctime])
W('<tr>')
for j in x:
W('<td>'+str(j)+'</td>')
W('</tr>\n')
if (count % 40) == 0:
W('<tr>')
for j in F:
W('<th>'+j.replace('_',' ')+'</th>')
W('</tr>\n')
W('</table></body></html>\n')
W('total %d elements in queue\n' % count)
if __name__ == '__main__' and len(sys.argv) > 1:
if sys.argv[1] == 'html' :
W= sys.argv[3] if (len(sys.argv) > 3) else sys.stdout.write
html(sys.argv[2],W)
else: raise ValueError('unknown command %r' % sys.argv[1])
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