mirror of
https://github.com/trustgraph-ai/trustgraph.git
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34eb083836
* Plugin architecture for messaging fabric * Schemas use a technology neutral expression * Schemas strictness has uncovered some incorrect schema use which is fixed
520 lines
13 KiB
Python
520 lines
13 KiB
Python
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from .. schema import LibrarianRequest, LibrarianResponse
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from .. schema import DocumentMetadata, ProcessingMetadata
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from .. schema import Error, Triple, Value
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from .. knowledge import hash
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from .. exceptions import RequestError
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from cassandra.cluster import Cluster
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from cassandra.auth import PlainTextAuthProvider
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from cassandra.query import BatchStatement
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from ssl import SSLContext, PROTOCOL_TLSv1_2
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import uuid
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import time
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import asyncio
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import logging
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logger = logging.getLogger(__name__)
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class LibraryTableStore:
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def __init__(
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self,
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cassandra_host, cassandra_username, cassandra_password, keyspace,
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):
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self.keyspace = keyspace
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logger.info("Connecting to Cassandra...")
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# Ensure cassandra_host is a list
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if isinstance(cassandra_host, str):
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cassandra_host = [h.strip() for h in cassandra_host.split(',')]
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if cassandra_username and cassandra_password:
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ssl_context = SSLContext(PROTOCOL_TLSv1_2)
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auth_provider = PlainTextAuthProvider(
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username=cassandra_username, password=cassandra_password
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)
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self.cluster = Cluster(
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cassandra_host,
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auth_provider=auth_provider,
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ssl_context=ssl_context
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)
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else:
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self.cluster = Cluster(cassandra_host)
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self.cassandra = self.cluster.connect()
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logger.info("Connected.")
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self.ensure_cassandra_schema()
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self.prepare_statements()
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def ensure_cassandra_schema(self):
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logger.debug("Ensure Cassandra schema...")
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logger.debug("Keyspace...")
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# FIXME: Replication factor should be configurable
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self.cassandra.execute(f"""
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create keyspace if not exists {self.keyspace}
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with replication = {{
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'class' : 'SimpleStrategy',
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'replication_factor' : 1
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}};
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""");
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self.cassandra.set_keyspace(self.keyspace)
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logger.debug("document table...")
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self.cassandra.execute("""
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CREATE TABLE IF NOT EXISTS document (
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id text,
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user text,
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time timestamp,
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kind text,
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title text,
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comments text,
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metadata list<tuple<
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text, boolean, text, boolean, text, boolean
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>>,
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tags list<text>,
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object_id uuid,
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PRIMARY KEY (user, id)
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);
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""");
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logger.debug("object index...")
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self.cassandra.execute("""
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CREATE INDEX IF NOT EXISTS document_object
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ON document (object_id)
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""");
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logger.debug("processing table...")
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self.cassandra.execute("""
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CREATE TABLE IF NOT EXISTS processing (
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id text,
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document_id text,
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time timestamp,
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flow text,
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user text,
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collection text,
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tags list<text>,
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PRIMARY KEY (user, id)
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);
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""");
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logger.info("Cassandra schema OK.")
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def prepare_statements(self):
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self.insert_document_stmt = self.cassandra.prepare("""
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INSERT INTO document
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(
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id, user, time,
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kind, title, comments,
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metadata, tags, object_id
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)
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VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)
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""")
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self.update_document_stmt = self.cassandra.prepare("""
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UPDATE document
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SET time = ?, title = ?, comments = ?,
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metadata = ?, tags = ?
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WHERE user = ? AND id = ?
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""")
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self.get_document_stmt = self.cassandra.prepare("""
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SELECT time, kind, title, comments, metadata, tags, object_id
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FROM document
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WHERE user = ? AND id = ?
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""")
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self.delete_document_stmt = self.cassandra.prepare("""
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DELETE FROM document
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WHERE user = ? AND id = ?
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""")
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self.test_document_exists_stmt = self.cassandra.prepare("""
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SELECT id
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FROM document
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WHERE user = ? AND id = ?
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LIMIT 1
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""")
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self.list_document_stmt = self.cassandra.prepare("""
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SELECT
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id, time, kind, title, comments, metadata, tags, object_id
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FROM document
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WHERE user = ?
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""")
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self.list_document_by_tag_stmt = self.cassandra.prepare("""
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SELECT
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id, time, kind, title, comments, metadata, tags, object_id
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FROM document
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WHERE user = ? AND tags CONTAINS ?
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ALLOW FILTERING
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""")
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self.insert_processing_stmt = self.cassandra.prepare("""
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INSERT INTO processing
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(
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id, document_id, time,
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flow, user, collection,
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tags
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)
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VALUES (?, ?, ?, ?, ?, ?, ?)
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""")
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self.delete_processing_stmt = self.cassandra.prepare("""
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DELETE FROM processing
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WHERE user = ? AND id = ?
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""")
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self.test_processing_exists_stmt = self.cassandra.prepare("""
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SELECT id
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FROM processing
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WHERE user = ? AND id = ?
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LIMIT 1
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""")
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self.list_processing_stmt = self.cassandra.prepare("""
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SELECT
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id, document_id, time, flow, collection, tags
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FROM processing
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WHERE user = ?
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""")
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async def document_exists(self, user, id):
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resp = self.cassandra.execute(
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self.test_document_exists_stmt,
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( user, id )
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)
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# If a row exists, document exists. It's a cursor, can't just
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# count the length
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for row in resp:
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return True
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return False
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async def add_document(self, document, object_id):
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logger.info(f"Adding document {document.id} {object_id}")
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metadata = [
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(
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v.s.value, v.s.is_uri, v.p.value, v.p.is_uri,
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v.o.value, v.o.is_uri
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)
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for v in document.metadata
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]
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while True:
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try:
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resp = self.cassandra.execute(
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self.insert_document_stmt,
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(
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document.id, document.user, int(document.time * 1000),
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document.kind, document.title, document.comments,
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metadata, document.tags, object_id
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)
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)
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break
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except Exception as e:
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logger.error("Exception occurred", exc_info=True)
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raise e
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logger.debug("Add complete")
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async def update_document(self, document):
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logger.info(f"Updating document {document.id}")
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metadata = [
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(
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v.s.value, v.s.is_uri, v.p.value, v.p.is_uri,
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v.o.value, v.o.is_uri
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)
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for v in document.metadata
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]
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while True:
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try:
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resp = self.cassandra.execute(
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self.update_document_stmt,
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(
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int(document.time * 1000), document.title,
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document.comments, metadata, document.tags,
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document.user, document.id
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)
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)
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break
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except Exception as e:
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logger.error("Exception occurred", exc_info=True)
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raise e
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logger.debug("Update complete")
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async def remove_document(self, user, document_id):
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logger.info(f"Removing document {document_id}")
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while True:
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try:
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resp = self.cassandra.execute(
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self.delete_document_stmt,
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(
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user, document_id
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)
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)
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break
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except Exception as e:
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logger.error("Exception occurred", exc_info=True)
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raise e
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logger.debug("Delete complete")
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async def list_documents(self, user):
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logger.debug("List documents...")
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while True:
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try:
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resp = self.cassandra.execute(
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self.list_document_stmt,
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(user,)
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)
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break
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except Exception as e:
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logger.error("Exception occurred", exc_info=True)
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raise e
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lst = [
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DocumentMetadata(
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id = row[0],
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user = user,
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time = int(time.mktime(row[1].timetuple())),
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kind = row[2],
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title = row[3],
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comments = row[4],
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metadata = [
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Triple(
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s=Value(value=m[0], is_uri=m[1]),
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p=Value(value=m[2], is_uri=m[3]),
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o=Value(value=m[4], is_uri=m[5])
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)
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for m in row[5]
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],
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tags = row[6] if row[6] else [],
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)
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for row in resp
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]
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logger.debug("Done")
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return lst
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async def get_document(self, user, id):
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logger.debug("Get document")
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while True:
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try:
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resp = self.cassandra.execute(
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self.get_document_stmt,
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(user, id)
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)
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break
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except Exception as e:
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logger.error("Exception occurred", exc_info=True)
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raise e
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for row in resp:
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doc = DocumentMetadata(
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id = id,
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user = user,
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time = int(time.mktime(row[0].timetuple())),
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kind = row[1],
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title = row[2],
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comments = row[3],
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metadata = [
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Triple(
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s=Value(value=m[0], is_uri=m[1]),
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p=Value(value=m[2], is_uri=m[3]),
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o=Value(value=m[4], is_uri=m[5])
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)
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for m in row[4]
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],
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tags = row[5] if row[5] else [],
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)
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logger.debug("Done")
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return doc
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raise RuntimeError("No such document row?")
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async def get_document_object_id(self, user, id):
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logger.debug("Get document obj ID")
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while True:
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try:
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resp = self.cassandra.execute(
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self.get_document_stmt,
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(user, id)
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)
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break
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except Exception as e:
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logger.error("Exception occurred", exc_info=True)
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raise e
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for row in resp:
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logger.debug("Done")
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return row[6]
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raise RuntimeError("No such document row?")
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async def processing_exists(self, user, id):
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resp = self.cassandra.execute(
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self.test_processing_exists_stmt,
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( user, id )
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)
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# If a row exists, document exists. It's a cursor, can't just
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# count the length
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for row in resp:
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return True
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return False
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async def add_processing(self, processing):
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logger.info(f"Adding processing {processing.id}")
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while True:
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try:
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resp = self.cassandra.execute(
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self.insert_processing_stmt,
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(
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processing.id, processing.document_id,
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int(processing.time * 1000), processing.flow,
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processing.user, processing.collection,
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processing.tags
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)
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)
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break
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except Exception as e:
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logger.error("Exception occurred", exc_info=True)
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raise e
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logger.debug("Add complete")
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async def remove_processing(self, user, processing_id):
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logger.info(f"Removing processing {processing_id}")
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while True:
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try:
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resp = self.cassandra.execute(
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self.delete_processing_stmt,
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(
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user, processing_id
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)
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)
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break
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except Exception as e:
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logger.error("Exception occurred", exc_info=True)
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raise e
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logger.debug("Delete complete")
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async def list_processing(self, user):
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logger.debug("List processing objects")
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while True:
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try:
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resp = self.cassandra.execute(
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self.list_processing_stmt,
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(user,)
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)
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break
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except Exception as e:
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logger.error("Exception occurred", exc_info=True)
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raise e
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lst = [
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ProcessingMetadata(
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id = row[0],
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document_id = row[1],
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time = int(time.mktime(row[2].timetuple())),
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flow = row[3],
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user = user,
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collection = row[4],
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tags = row[5] if row[5] else [],
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)
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for row in resp
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]
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logger.debug("Done")
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return lst
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