Moves database file to server and makes the database into a class
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Oleg Silkin
parent
a64f233641
commit
dfde45c078
1 changed files with 141 additions and 0 deletions
141
server/database.py
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141
server/database.py
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import sqlite3
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import typing
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import re
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import nacl.hash
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import time
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from server.conf import *
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def validate_input(**kwargs):
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assert 0 < len(kwargs['comment']) <= 2000
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assert re.fullmatch(
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'[a-z0-9]{40}:([a-z0-9]{40})?',
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kwargs['claim_id'] + ':' + kwargs.get('channel_id', '')
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)
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if 'channel_name' in kwargs:
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assert re.fullmatch(
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'^@{1}(?:(?![\x00-\x08\x0b\x0c\x0e-\x1f\x23-\x26'
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'\x2f\x3a\x3d\x3f-\x40\uFFFE-\U0000FFFF]).){1,255}$',
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kwargs['channel_name']
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)
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class DatabaseConnection:
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def obtain_connection(self):
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self.connection = sqlite3.connect(self.filepath)
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if self.row_factory:
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self.connection.row_factory = sqlite3.Row
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def __init__(self, filepath: str, row_factory: bool = True):
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self.filepath = filepath
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self.row_factory = row_factory
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self.connection = None
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def generate_schema(self, filepath: str):
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with open(filepath, 'r') as ddl_file:
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self.connection.executescript(ddl_file.read())
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def get_claim_comments(self, claim_id: str,
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parent_id: str = None,
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page: int = 1,
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page_size: int = 50,
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top_level: bool = False, **kwargs):
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if top_level:
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curs = self.connection.execute(
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""" SELECT *
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FROM COMMENTS_ON_CLAIMS
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WHERE claim_id LIKE ? AND parent_id IS NULL
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LIMIT ? OFFSET ? """,
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(claim_id, page_size, page_size*(page - 1))
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)
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elif parent_id is None:
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curs = self.connection.execute(
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""" SELECT *
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FROM COMMENTS_ON_CLAIMS WHERE claim_id LIKE ?
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LIMIT ? OFFSET ? """,
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(claim_id, page_size, page_size*(page - 1))
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)
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else:
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curs = self.connection.execute(
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""" SELECT *
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FROM COMMENTS_ON_CLAIMS
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WHERE claim_id LIKE ? AND parent_id = ?
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LIMIT ? OFFSET ? """,
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(claim_id, parent_id, page_size, page_size*(page - 1))
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)
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return [dict(row) for row in curs.fetchall()]
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def _insert_channel(self, channel_name, channel_id, *args, **kwargs):
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with self.connection:
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self.connection.execute(
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'INSERT INTO CHANNEL(ClaimId, Name) VALUES (?, ?)',
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(channel_id, channel_name)
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)
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def _insert_comment(self, claim_id: str = None, comment: str = None,
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channel_id: str = None, sig: str = None,
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parent_id: str = None, **kwargs):
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timestamp = time.time_ns()
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comment_prehash = ':'.join((claim_id, comment, str(timestamp),))
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comment_prehash = bytes(comment_prehash.encode('utf-8'))
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comment_id = nacl.hash.sha256(comment_prehash).decode('utf-8')
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with self.connection:
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self.connection.execute(
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"""
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INSERT INTO COMMENT(CommentId, LbryClaimId, ChannelId, Body,
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ParentId, Signature, Timestamp)
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VALUES (?, ?, ?, ?, ?, ?, ?)
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""",
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(comment_id, claim_id, channel_id, comment, parent_id, sig, timestamp)
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)
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return comment_id
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def create_comment(self, channel_name: str = None, channel_id: str = None, **kwargs) -> dict:
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if channel_id and channel_name:
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self._insert_channel(channel_name, channel_id)
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else:
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channel_name, channel_id = anonymous['channel_name'], anonymous['channel_id']
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validate_input(channel_id=channel_id, channel_name=channel_name, **kwargs)
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comcast_id = self._insert_comment(channel_id=channel_id, **kwargs)
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curry = self.connection.execute(
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'SELECT * FROM COMMENTS_ON_CLAIMS WHERE comment_id = ?', (comcast_id,)
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)
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thing = curry.fetchone()
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return dict(thing) if thing else None
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def get_comment_ids(self, claim_id: str, parent_id: str = None, page=1, page_size=50):
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""" Just return a list of the comment IDs that are associated with the given claim_id.
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If get_all is specified then it returns all the IDs, otherwise only the IDs at that level.
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if parent_id is left null then it only returns the top level comments.
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For pagination the parameters are:
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get_all XOR (page_size + page)
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"""
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if parent_id is None:
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curs = self.connection.execute("""
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SELECT comment_id FROM COMMENTS_ON_CLAIMS
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WHERE claim_id LIKE ? AND parent_id IS NULL LIMIT ? OFFSET ?
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""", (claim_id, page_size, page_size*abs(page - 1),)
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)
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else:
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curs = self.connection.execute("""
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SELECT comment_id FROM COMMENTS_ON_CLAIMS
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WHERE claim_id LIKE ? AND parent_id LIKE ? LIMIT ? OFFSET ?
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""", (claim_id, parent_id, page_size, page_size * abs(page - 1),)
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)
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return [tuple(row) for row in curs.fetchall()]
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def get_comments_by_id(self, comment_ids: list) -> typing.Union[list, None]:
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""" Returns a list containing the comment data associated with each ID within the list"""
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placeholders = ', '.join('?' for _ in comment_ids)
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curs = self.connection.execute(
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f'SELECT * FROM COMMENTS_ON_CLAIMS WHERE comment_id IN ({placeholders})',
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comment_ids
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)
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return [dict(row) for row in curs.fetchall()]
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if __name__ == '__main__':
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pass
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# __generate_database_schema(connection, 'comments_ddl.sql')
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