More MessageDB improvements, including timestamp constraints in getting chatlog (messages since timestamp)

CHANGELOG.md

@@ -6,6 +6,17 @@ Notable changes to OgbujiPT. Format based on [Keep a Changelog](https://keepacha
 ## [Unreleased]
 -->
 
+## [0.7.1] - 20240122
+
+### Added
+
+- MessageDB.get_messages() options: `since` (for retrieving messages aftter a timestamp) and `limit` (for limiting the number of messages returned, selecting the most recent)
+
+### Changed
+
+- Better modularization of embeddings test cases; using `conftest.py` more
+- `pgvector_message.py` PG table timstamp column no longer a primary key
+
 ## [0.7.0] - 20240110
 
 ### Added

pylib/embedding/pgvector.py

@@ -187,7 +187,7 @@ async def count_items(self) -> int:
             # Count the number of documents in the table
             count = await conn.fetchval(f'SELECT COUNT(*) FROM {self.table_name}')
         return count
-    
+
     async def table_exists(self) -> bool:
         '''
         Check if the table exists
@@ -197,11 +197,11 @@ async def table_exists(self) -> bool:
         '''
         # Check if the table exists
         async with (await self.connection_pool()).acquire() as conn:
-            table_exists = await conn.fetchval(
+            exists = await conn.fetchval(
                 CHECK_TABLE_EXISTS,
                 self.table_name
             )
-        return table_exists
+        return exists
 
     async def drop_table(self) -> None:
         '''

pylib/embedding/pgvector_message.py

@@ -9,6 +9,7 @@
 from uuid import UUID
 from datetime import datetime, timezone
 from typing import Iterable
+import warnings
 
 from ogbujipt.config import attr_dict
 from ogbujipt.embedding.pgvector import PGVectorHelper, asyncpg, process_search_response
@@ -21,7 +22,7 @@
 
 CREATE_MESSAGE_TABLE = '''-- Create a table to hold individual messages (e.g. from a chatlog) and their metadata
 CREATE TABLE IF NOT EXISTS {table_name} (
-    ts TIMESTAMP WITH TIME ZONE PRIMARY KEY,  -- timestamp of the message
+    ts TIMESTAMP WITH TIME ZONE,              -- timestamp of the message
     history_key UUID,                         -- uunique identifier for contextual message history
     role TEXT,                                -- role of the message (meta ID such as 'system' or user,
                                               -- or an ID associated with the sender)
@@ -39,11 +40,7 @@
     embedding,
     ts,
     metadata
-) VALUES ($1, $2, $3, $4, $5, $6)
-ON CONFLICT (ts) DO UPDATE SET  -- Update the content, embedding, and metadata of the message if it already exists
-    content = EXCLUDED.content,
-    embedding = EXCLUDED.embedding,
-    metadata = EXCLUDED.metadata;
+) VALUES ($1, $2, $3, $4, $5, $6);
 '''
 
 CLEAR_MESSAGE = '''-- Deletes matching messages
@@ -52,7 +49,7 @@
     history_key = $1
 '''
 
-RETURN_MESSAGE_BY_HISTORY_KEY = '''-- Get entire chatlog by history key
+RETURN_MESSAGES_BY_HISTORY_KEY = '''-- Get entire chatlog by history key
 SELECT
     ts,
     role,
@@ -62,8 +59,10 @@
     {table_name}
 WHERE
     history_key = $1
+{since_clause}
 ORDER BY
-    ts;
+    ts DESC
+{limit_clause};
 '''
 
 SEMANTIC_QUERY_MESSAGE_TABLE = '''-- Find messages with closest semantic similarity
@@ -179,54 +178,88 @@ async def clear(
                     ),
                     history_key
                 )
-    
+
     # XXX: Change to a generator
-    async def get_table(
+    async def get_messages(
             self,
-            history_key: UUID
-    ) -> list[asyncpg.Record]:
+            history_key: UUID | str,
+            since: datetime | None = None,
+            limit: int = 0
+    ): # -> list[asyncpg.Record]:
         '''
-        Retrieve all entries in a message history
+        Retrieve entries in a message history
 
         Args:
-            history_key (str): history key (unique identifier) to match
+            history_key (str): history key (unique identifier) to match; string or object
+            since (datetime, optional): only return messages after this timestamp
+            limit (int, optional): maximum number of messages to return. Default is all messages
         Returns:
-            list[asyncpg.Record]: list of message entries
-                (asyncpg.Record objects are similar to dicts, but allow for attribute-style access)
+            generates asyncpg.Record instances of resulting messages
         '''
+        qparams = [history_key]
         async with (await self.connection_pool()).acquire() as conn:
+            if not isinstance(history_key, UUID):
+                history_key = UUID(history_key)
+                # msg = f'history_key must be a UUID, not {type(history_key)} ({history_key}))'
+                # raise TypeError(msg)
+            if not isinstance(since, datetime) and since is not None:
+                msg = 'since must be a datetime or None'
+                raise TypeError(msg)
+            if since:
+                # Really don't need the ${len(qparams) + 1} trick here, but used for consistency
+                since_clause = f' AND ts > ${len(qparams) + 1}'
+                qparams.append(since)
+            else:
+                since_clause = ''
+            if limit:
+                limit_clause = f'LIMIT ${len(qparams) + 1}'
+                qparams.append(limit)
+            else:
+                limit_clause = ''
             message_records = await conn.fetch(
-                RETURN_MESSAGE_BY_HISTORY_KEY.format(
+                RETURN_MESSAGES_BY_HISTORY_KEY.format(
                     table_name=self.table_name,
+                    since_clause=since_clause,
+                    limit_clause=limit_clause
                 ),
-                history_key
+                *qparams
             )
 
-        messages = [
-            attr_dict({
+        return (attr_dict({
                 'ts': record['ts'],
                 'role': record['role'],
                 'content': record['content'],
                 'metadata': record['metadata']
-            })
-            for record in message_records
-        ]
-
-        return messages
+            }) for record in message_records)
+
+        # async for record in message_records:
+        #     yield attr_dict({
+        #         'ts': record['ts'],
+        #         'role': record['role'],
+        #         'content': record['content'],
+        #         'metadata': record['metadata']
+        #     })
 
+    async def get_table(self, history_key):
+        # Deprecated
+        warnings.warn('pgvector_message.get_table() is deprecated. Use get_messages().', DeprecationWarning)
+        return list(await self.get_messages(history_key))
+
     async def search(
             self,
             history_key: UUID,
             text: str,
+            since: datetime | None = None,
             limit: int = 1
     ) -> list[asyncpg.Record]:
         '''
         Similarity search documents using a query string
 
         Args:
+            history_key (str): history key for the conversation to query
             text (str): string to compare against items in the table
-
-            k (int, optional): maximum number of results to return (useful for top-k query)
+            since (datetime, optional): only return results after this timestamp
+            limit (int, optional): maximum number of messages to return; for top-k type query. Default is 1
         Returns:
             list[asyncpg.Record]: list of search results
                 (asyncpg.Record objects are similar to dicts, but allow for attribute-style access)

test/embedding/conftest.py

@@ -1,5 +1,19 @@
+# SPDX-FileCopyrightText: 2023-present Oori Data <[email protected]>
+# SPDX-License-Identifier: Apache-2.0
+# test/embedding/conftest.py
+'''
+Fixtures/setup/teardown for embedding tests
+'''
+
+import sys
+import os
 import pytest
+import pytest_asyncio
+from unittest.mock import MagicMock, DEFAULT  # noqa: F401
+
 import numpy as np
+from ogbujipt.embedding.pgvector import MessageDB, DataDB, DocDB
+
 
 @pytest.fixture
 def CORRECT_STRING():
@@ -67,3 +81,57 @@ def HITHERE_all_MiniLM_L12_v2():
 -0.071223356, 0.0019683593, 0.032683503, -0.08899012, 0.10160039, 0.04948275, 0.048017487, -0.046223965,
 0.032460734, -0.043729845, 0.030224336, -0.019220904, 0.08223829, 0.03851222, -0.016376046, 0.041965306,
 0.0445879, -0.03780432, -0.024826797, 0.014669102, 0.057102628, -0.031820614, 0.0027352672, 0.052658144])
+
+# XXX: This stanza to go away once mocking is complete - Kai
+HOST = os.environ.get('PG_HOST', 'localhost')
+DB_NAME = os.environ.get('PG_DATABASE', 'mock_db')
+USER = os.environ.get('PG_USER', 'mock_user')
+PASSWORD = os.environ.get('PG_PASSWORD', 'mock_password')
+PORT = os.environ.get('PG_PORT', 5432)
+
+
+# XXX: Move to a fixture?
+# Definitely don't want to even import SentenceTransformer class due to massive side-effects
+class SentenceTransformer(object):
+    def __init__(self, model_name_or_path):
+        self.encode = MagicMock()
+
+
+DB_CLASS = {
+    'test/embedding/test_pgvector_message.py': MessageDB,
+    'test/embedding/test_pgvector_data.py': DataDB,
+    'test/embedding/test_pgvector_doc.py': DocDB,
+}
+
+
+@pytest_asyncio.fixture  # Notice the async aware fixture declaration
+async def DB(request):
+    testname = request.node.name
+    testfile = request.node.location[0]
+    table_name = testname.lower()
+    print(f'DB setup for test: {testname}. Table name {table_name}', file=sys.stderr)
+    dummy_model = SentenceTransformer('mock_transformer')
+    dummy_model.encode.return_value = np.array([1, 2, 3])
+    try:
+        vDB = await DB_CLASS[testfile].from_conn_params(
+            embedding_model=dummy_model,
+            table_name=table_name,
+            db_name=DB_NAME,
+            host=HOST,
+            port=int(PORT),
+            user=USER,
+            password=PASSWORD)
+    except ConnectionRefusedError:
+        pytest.skip("No Postgres instance made available for test. Skipping.", allow_module_level=True)
+    if vDB is None:
+        pytest.skip("No Postgres instance made available for test. Skipping.", allow_module_level=True)
+
+    # Create table
+    await vDB.drop_table()
+    assert not await vDB.table_exists(), Exception("Table exists before creation")
+    await vDB.create_table()
+    assert await vDB.table_exists(), Exception("Table does not exist after creation")
+    # The test will take control upon the yield
+    yield vDB
+    # Teardown: Drop table
+    await vDB.drop_table()