''' This module contains DB logic ''' import logging from datetime import datetime, timedelta import sys from sqlalchemy import create_engine, Column, Integer, String, DateTime, inspect from sqlalchemy.orm import sessionmaker from sqlalchemy.ext.declarative import declarative_base from config_manager import get_config PAGESIZE = 10 """ This class describe a single Record (Rec() class) and the records manager (RecDB() class) """ Base = declarative_base() class Rec(Base): '''Entry on the DB''' __tablename__ = 'rec' id = Column(Integer, primary_key=True) name = Column(String, nullable=True) starttime = Column(DateTime, nullable=True) endtime = Column(DateTime, nullable=True) filename = Column(String, nullable=True) def __init__(self, name="", starttime=None, endtime=None, filename=None): self.name = name self.starttime = starttime self.endtime = endtime self.filename = filename def serialize(self): '''json-friendly encoding''' return {'id': self.id, 'name': self.name, 'starttime': self.starttime, 'endtime': self.endtime, 'filename': self.filename } def __repr__(self): contents = "id:'%s',name:'%s',Start: '%s',End: '%s'" % \ (self.id, self.name, self.starttime, self.endtime) if self.filename is not None: contents += ",Filename: '%s'" % self.filename return "" % contents class RecDB: def __init__(self, uri): self.engine = create_engine(uri, echo=False) self.conn = self.engine.connect() self.log = logging.getLogger(name=self.__class__.__name__) logging.getLogger('sqlalchemy.engine').setLevel(logging.FATAL) logging.getLogger('sqlalchemy.engine.base.Engine')\ .setLevel(logging.FATAL) logging.getLogger('sqlalchemy.dialects').setLevel(logging.FATAL) logging.getLogger('sqlalchemy.pool').setLevel(logging.FATAL) logging.getLogger('sqlalchemy.orm').setLevel(logging.FATAL) Base.metadata.create_all(self.engine) # create Database Session = sessionmaker(bind=self.engine) self.session = Session() self.err = "" def add(self, simplerecord): s = self.get_session() s.add( simplerecord ) s.commit() self.log.info("New Record: %s" % simplerecord) return ( simplerecord ) def update(self, id, rec): ## TODO: rlist = results list _rlist = self._search(_id=id) if not len(_rlist) == 1: raise ValueError('Too many recs with id=%s' % id) self.log.debug("DB:: Update request %s:%s " % (id, rec)) self.log.debug("DB:: Update: data before %s" % _rlist[0]) # 2013-11-24 22:22:42 _rlist[0].starttime = rec["starttime"] _rlist[0].endtime = rec["endtime"] if 'name' in rec: _rlist[0].name = rec["name"] self.log.debug("DB:: Update: data AFTER %s" % _rlist[0]) inspect(_rlist[0]).session.commit() self.log.debug("DB:: Update complete") return _rlist[0] def delete(self, recid): _rlist = self._search(id=recid) if len(_rlist) == 0: self.log.info("DB: Delete: no record found!") self.err = "No rec found" return False if len(_rlist) > 1: self.log.warning("DB: Delete: multiple records found!") self.err = "multiple ID Found %s" % (_rlist) return False s = self.get_session() s.delete(_rlist[0]) logging.info("DB: Delete: delete complete") s.commit() return True def commit(self): logging.info("DB: Commit!!") self.session.commit() def get_session(self): Session = sessionmaker(bind=self.engine) return Session() def get_all(self, page=0, page_size=PAGESIZE): return self._search(page=page, page_size=page_size) def get_ongoing(self, page=0, page_size=PAGESIZE): query = self._query_page(self._query_ongoing(), page, page_size) return query.all() def get_not_completed(self, minseconds=36000): query = self._query_ongoing() query = self._query_older(timedelta(seconds=minseconds), query) return query.all() def _query_ongoing(self, query=None): ''' Not terminated AND recent. The meaning is "a query that makes sense to stop" ''' delta = timedelta(seconds=get_config()['FORGE_MAX_DURATION']) return self._query_not_saved(query).filter(Rec.starttime > datetime.now() - delta) def _query_not_saved(self, query=None): '''Still not saved''' if query is None: query = self.get_session().query(Rec) return query.filter(Rec.filename == None) def _query_older(self, delta, query=None): '''Get Rec older than delta seconds''' if query is None: query = self.get_session().query(Rec) return query.filter(Rec.starttime < datetime.now() - delta) def _query_page(self, query, page=0, page_size=PAGESIZE): if page_size: page_size = int(page_size) query = query.limit(page_size) if page: query = query.offset(page*page_size) return query def _query_generic(self, query, _id=None, name=None, starttime=None, endtime=None): if _id is not None: query = query.filter_by(id=_id) if name is not None: query = query.filter(Rec.name.like("%"+name+"%")) if starttime is not None: _st = starttime query = query.filter(Rec.starttime > _st) if endtime is not None: _et = endtime query = query.filter(Rec.endtime < _et) return query def _search(self, _id=None, name=None, starttime=None, endtime=None, page=0, page_size=PAGESIZE): self.log.debug( "DB: Search => id:%s name:%s starttime:%s endtime=%s" % (_id, name, starttime, endtime)) query = self.get_session().query(Rec) query = self._query_generic(query, _id, name, starttime, endtime) query = self._query_page(query, page, page_size) self.log.debug("Searching: %s" % str(query)) ret = query.all() return ret def get_err(self): print "DB error: %s" % (self.err) t = self.err self.err = "" return t if __name__ == "__main__": def printall(queryres): for record in queryres: print "Record: %s" % record db = RecDB() _mytime = datetime(2014,05,23,15,12,17) _endtime = datetime(2014,05,24,17,45,17) a = Rec(name="Mimmo1", starttime=_mytime, endtime=_endtime) printall( db._search() ) sys.exit("End test job") # a = Rec(name="Mimmo1", starttime=_mytime, endtime=None) print "Aggiunto", db.add( a ) printall( db.get_all(page_size=5,page=0) ) print "Mimmo " printall( db._search(name="Mimmo1")) print "Search" printall( db._search(name="Mimmo1",starttime=datetime(2014,05,24,15,16,1) )) a = db.get_by_id(5) a.start() db.delete(1) db.delete(2) db.delete(4) db.delete(1) printall( db._search() )