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db.py
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db.py
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# -*- coding: UTF-8 -*-
"""
Database access layer using SQL Alchemy
@author: Sébastien Renard <sebastien.renard@digitalfox.org>
@license: GPL v3 or later
"""
import json
import os
import sys
from pickle import loads, dumps
from datetime import datetime
from uuid import uuid1
from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.ext.associationproxy import association_proxy
from sqlalchemy.orm import sessionmaker, relationship
from sqlalchemy.orm.exc import NoResultFound
from sqlalchemy import Column, Integer, Boolean, Unicode, DateTime, Enum, ForeignKey, or_
from sqlalchemy.types import TypeDecorator, VARCHAR
from yokadi.core.recurrencerule import RecurrenceRule
from yokadi.core.yokadiexception import YokadiException
# Yokadi database version needed for this code
# If database config key DB_VERSION differs from this one a database migration
# is required
DB_VERSION = 10
DB_VERSION_KEY = "DB_VERSION"
class DbUserException(Exception):
"""
This exception is for errors which are not caused by a failure in our code
and which must be fixed by the user.
"""
pass
Base = declarative_base()
NOTE_KEYWORD = "_note"
def uuidGenerator():
return str(uuid1())
class Project(Base):
__tablename__ = "project"
id = Column(Integer, primary_key=True)
uuid = Column(Unicode, unique=True, default=uuidGenerator, nullable=False)
name = Column(Unicode, unique=True)
active = Column(Boolean, default=True)
tasks = relationship("Task", cascade="all", backref="project")
def __repr__(self):
return self.name
def merge(self, session, other):
"""Merge other into us"""
if self is other:
raise YokadiException("Cannot merge a project into itself")
# Do a bulk-update: it's faster than updating each task individually
session.query(Task).filter_by(projectId=other.id).update({Task.projectId: self.id})
# Tell SQLAlchemy to forget everything it knows about `other`,
# otherwise it will delete the tasks which were once attached to it
session.expire(other)
session.delete(other)
class Keyword(Base):
__tablename__ = "keyword"
id = Column(Integer, primary_key=True)
name = Column(Unicode, unique=True)
tasks = association_proxy("taskKeywords", "task")
taskKeywords = relationship("TaskKeyword", cascade="all", backref="keyword")
def __repr__(self):
return self.name
class TaskKeyword(Base):
__tablename__ = "task_keyword"
id = Column(Integer, primary_key=True)
taskId = Column("task_id", Integer, ForeignKey("task.id"), nullable=False)
keywordId = Column("keyword_id", Integer, ForeignKey("keyword.id"), nullable=False)
value = Column(Integer, default=None)
def __repr__(self):
return "<TaskKeyword task={} keyword={} value={}>".format(self.task, self.keyword, self.value)
class RecurrenceRuleColumnType(TypeDecorator):
"""Represents an ydateutils.RecurrenceRule column
"""
impl = VARCHAR
def process_bind_param(self, value, dialect):
if value:
value = json.dumps(value.toDict())
else:
value = ""
return value
def process_result_value(self, value, dialect):
if value:
dct = json.loads(value)
value = RecurrenceRule.fromDict(dct)
else:
value = RecurrenceRule()
return value
class Task(Base):
__tablename__ = "task"
id = Column(Integer, primary_key=True)
uuid = Column(Unicode, unique=True, default=uuidGenerator, nullable=False)
title = Column(Unicode)
creationDate = Column("creation_date", DateTime, nullable=False, default=datetime.now)
dueDate = Column("due_date", DateTime, default=None)
doneDate = Column("done_date", DateTime, default=None)
description = Column(Unicode, default="", nullable=False)
urgency = Column(Integer, default=0, nullable=False)
status = Column(Enum("new", "started", "done"), default="new")
recurrence = Column(RecurrenceRuleColumnType, nullable=False, default=RecurrenceRule())
projectId = Column("project_id", Integer, ForeignKey("project.id"), nullable=False)
taskKeywords = relationship("TaskKeyword", cascade="all", backref="task")
lock = relationship("TaskLock", cascade="all", backref="task")
def setKeywordDict(self, dct):
"""
Defines keywords of a task.
Dict is of the form: keywordName => value
"""
session = getSession()
for taskKeyword in self.taskKeywords:
session.delete(taskKeyword)
for name, value in list(dct.items()):
keyword = session.query(Keyword).filter_by(name=name).one()
session.add(TaskKeyword(task=self, keyword=keyword, value=value))
def getKeywordDict(self):
"""
Returns all keywords of a task as a dict of the form:
keywordName => value
"""
dct = {}
session = getSession()
# Do not use self.taskKeywords here: its output is outdated when called
# from a function connected to SQLAlchemy events
for taskKeyword in session.query(TaskKeyword).filter_by(task=self):
dct[taskKeyword.keyword.name] = taskKeyword.value
return dct
def getKeywordsAsString(self):
"""
Returns all keywords as a string like "key1=value1, key2=value2..."
"""
return ", ".join(list(("%s=%s" % k for k in list(self.getKeywordDict().items()))))
def getUserKeywordsNameAsString(self):
"""
Returns all keywords keys as a string like "key1, key2, key3...".
Internal keywords (starting with _) are ignored.
"""
keywords = [k for k in list(self.getKeywordDict().keys()) if not k.startswith("_")]
keywords.sort()
if keywords:
return ", ".join(keywords)
else:
return ""
def setStatus(self, status):
"""
Defines the status of the task, taking care of updating the done date
and doing the right thing for recurrent tasks
"""
if self.recurrence and status == "done":
self.dueDate = self.recurrence.getNext(self.dueDate)
else:
self.status = status
if status == "done":
self.doneDate = datetime.now().replace(second=0, microsecond=0)
else:
self.doneDate = None
session = getSession()
session.merge(self)
def setRecurrenceRule(self, rule):
"""Set recurrence and update the due date accordingly"""
self.recurrence = rule
self.dueDate = rule.getNext()
def __repr__(self):
return "<Task id={} title={}>".format(self.id, self.title)
class Config(Base):
"""yokadi config"""
__tablename__ = "config"
id = Column(Integer, primary_key=True)
name = Column(Unicode, unique=True)
value = Column(Unicode)
system = Column(Boolean)
desc = Column(Unicode)
class TaskLock(Base):
__tablename__ = "task_lock"
id = Column(Integer, primary_key=True)
taskId = Column("task_id", Integer, ForeignKey("task.id"), unique=True, nullable=False)
pid = Column(Integer, default=None)
updateDate = Column("update_date", DateTime, default=None)
class Alias(Base):
__tablename__ = "alias"
uuid = Column(Unicode, unique=True, default=uuidGenerator, nullable=False, primary_key=True)
name = Column(Unicode, unique=True, nullable=False)
command = Column(Unicode, nullable=False)
@staticmethod
def getAsDict(session):
dct = {}
for alias in session.query(Alias).all():
dct[alias.name] = alias.command
return dct
@staticmethod
def add(session, name, command):
alias = Alias(name=name, command=command)
session.add(alias)
return alias
@staticmethod
def rename(session, name, newName):
alias = session.query(Alias).filter_by(name=name).one()
alias.name = newName
@staticmethod
def setCommand(session, name, command):
alias = session.query(Alias).filter_by(name=name).one()
alias.command = command
def getConfigKey(name, environ=True):
session = getSession()
if environ:
return os.environ.get(name, session.query(Config).filter_by(name=name).one().value)
else:
return session.query(Config).filter_by(name=name).one().value
_database = None
def getSession():
global _database
if not _database:
raise YokadiException("Cannot get session. Not connected to database")
return _database.session
def connectDatabase(dbFileName, createIfNeeded=True, memoryDatabase=False):
global _database
_database = Database(dbFileName, createIfNeeded, memoryDatabase)
class Database(object):
def __init__(self, dbFileName, createIfNeeded=True, memoryDatabase=False, updateMode=False):
"""Connect to database and create it if needed
@param dbFileName: path to database file
@type dbFileName: str
@param createIfNeeded: Indicate if database must be created if it does not exists (default True)
@type createIfNeeded: bool
@param memoryDatabase: create db in memory. Only usefull for unit test. Default is false.
@type memoryDatabase: bool
@param updateMode: allow to use it without checking version. Default is false.
@type updateMode: bool
"""
dbFileName = os.path.abspath(dbFileName)
if sys.platform == 'win32':
connectionString = 'sqlite://' + dbFileName[0] + '|' + dbFileName[2:]
else:
connectionString = 'sqlite:///' + dbFileName
if memoryDatabase:
connectionString = "sqlite:///:memory:"
echo = os.environ.get("YOKADI_SQL_DEBUG", "0") != "0"
self.engine = create_engine(connectionString, echo=echo)
Session = sessionmaker(bind=self.engine)
self.session = Session()
if not os.path.exists(dbFileName) or memoryDatabase:
if not createIfNeeded:
raise DbUserException("Database file (%s) does not exist or is not readable." % dbFileName)
if not memoryDatabase:
print("Creating %s" % dbFileName)
self.createTables()
# Set database version according to current yokadi release
if not updateMode: # Update script add it from dump
self.session.add(Config(name=DB_VERSION_KEY, value=str(DB_VERSION), system=True, desc="Database schema release number"))
self.session.commit()
if not updateMode:
self.checkVersion()
def createTables(self):
"""Create all defined tables"""
Base.metadata.create_all(self.engine)
def getVersion(self):
if not self.engine.has_table("config"):
# There was no Config table in v1
return 1
try:
return int(self.session.query(Config).filter_by(name=DB_VERSION_KEY).one().value)
except NoResultFound:
raise YokadiException("Configuration key '%s' does not exist. This should not happen!" % DB_VERSION_KEY)
def setVersion(self, version):
assert self.engine.has_table("config")
instance = self.session.query(Config).filter_by(name=DB_VERSION_KEY).one()
instance.value = str(version)
self.session.add(instance)
self.session.commit()
def checkVersion(self):
"""Check version and exit if it is not suitable"""
version = self.getVersion()
if version != DB_VERSION:
msg = "Your database version is {} but Yokadi wants version {}.\n".format(version, DB_VERSION)
msg += "Please run Yokadi with the --update option to update your database."
raise DbUserException(msg)
def setDefaultConfig():
"""Set default config parameter in database if they (still) do not exist"""
defaultConfig = {
"ALARM_DELAY_CMD" : ('''kdialog --passivepopup "task {TITLE} ({ID}) is due for {DATE}" 180 --title "Yokadi: {PROJECT}"''', False,
"Command executed by Yokadi Daemon when a tasks due date is reached soon (see ALARM_DELAY"),
"ALARM_DUE_CMD" : ('''kdialog --passivepopup "task {TITLE} ({ID}) should be done now" 1800 --title "Yokadi: {PROJECT}"''', False,
"Command executed by Yokadi Daemon when a tasks due date is reached soon (see ALARM_DELAY"),
"ALARM_DELAY" : ("8", False, "Delay (in hours) before due date to launch the alarm (see ALARM_CMD)"),
"ALARM_SUSPEND" : ("1", False, "Delay (in hours) before an alarm trigger again"),
"PURGE_DELAY" : ("90", False, "Default delay (in days) for the t_purge command"),
"PASSPHRASE_CACHE": ("1", False, "Keep passphrase in memory till Yokadi is started (0 is false else true"),
}
session = getSession()
for name, value in defaultConfig.items():
if session.query(Config).filter_by(name=name).count() == 0:
session.add(Config(name=name, value=value[0], system=value[1], desc=value[2]))
# vi: ts=4 sw=4 et