Onionr/src/coredb/blockmetadb/updateblockinfo.py

'''
    Onionr - Private P2P Communication

    Update block information in the metadata database by a field name
'''
'''
    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 sqlite3
from .. import dbfiles
from etc import onionrvalues
def update_block_info(hash, key, data):
    '''
        sets info associated with a block

        hash         - the hash of a block
        dateReceived - the date the block was recieved, not necessarily when it was created
        decrypted    - if we can successfully decrypt the block (does not describe its current state)
        dataType     - data type of the block
        dataFound    - if the data has been found for the block
        dataSaved    - if the data has been saved for the block
        sig    - optional signature by the author (not optional if author is specified)
        author       - multi-round partial sha3-256 hash of authors public key
        dateClaimed  - timestamp claimed inside the block, only as trustworthy as the block author is
        expire       - expire date for a block
    '''
    if key not in ('dateReceived', 'decrypted', 'dataType', 'dataFound',
                  'dataSaved', 'sig', 'author', 'dateClaimed', 'expire'):
        raise ValueError('Key must be in the allowed list')

    conn = sqlite3.connect(dbfiles.block_meta_db, timeout=onionrvalues.DATABASE_LOCK_TIMEOUT)
    c = conn.cursor()
    args = (data, hash)
    # Unfortunately, not really possible to prepare this statement
    c.execute("UPDATE hashes SET " + key + " = ? where hash = ?;", args)
    conn.commit()
    conn.close()

    return True