Onionr/onionr/onionrusers/contactmanager.py

'''
    Onionr - Private P2P Communication

    Sets more abstract information related to a peer. Can be thought of as traditional 'contact' system
'''
'''
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.
'''
import os, json, onionrexceptions
from onionrusers import onionrusers

class ContactManager(onionrusers.OnionrUser):
    def __init__(self, coreInst, publicKey, saveUser=False, recordExpireSeconds=5):
        super(ContactManager, self).__init__(coreInst, publicKey, saveUser=saveUser)
        self.dataDir = coreInst.dataDir + '/contacts/'
        self.dataFile = '%s/contacts/%s.json' % (coreInst.dataDir, publicKey)
        self.lastRead = 0
        self.recordExpire = recordExpireSeconds
        self.data = self._loadData()
        self.deleted = False
        
        if not os.path.exists(self.dataDir):
            os.mkdir(self.dataDir)
    
    def _writeData(self):
        data = json.dumps(self.data)
        with open(self.dataFile, 'w') as dataFile:
            dataFile.write(data)

    def _loadData(self):
        self.lastRead = self._core._utils.getEpoch()
        retData = {}
        if os.path.exists(self.dataFile):
            with open(self.dataFile, 'r') as dataFile:
                retData = json.loads(dataFile.read())
        return retData

    def set_info(self, key, value, autoWrite=True):
        if self.deleted:
            raise onionrexceptions.ContactDeleted

        self.data[key] = value
        if autoWrite:
            self._writeData()
        return
    
    def get_info(self, key, forceReload=False):
        if self.deleted:
            raise onionrexceptions.ContactDeleted

        if (self._core._utils.getEpoch() - self.lastRead >= self.recordExpire) or forceReload:
            self.data = self._loadData()
        try:
            return self.data[key]
        except KeyError:
            return None

    def delete_contact(self):
        self.deleted = True
        if os.path.exists(self.dataFile):
            os.remove(self.dataFile)