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94 lines
3.4 KiB
Python
94 lines
3.4 KiB
Python
"""In-memory event store for demonstrating resumability functionality.
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This is a simple implementation intended for examples and testing,
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not for production use where a persistent storage solution would be more appropriate.
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"""
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import logging
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from collections import deque
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from dataclasses import dataclass
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from uuid import uuid4
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from mcp.server.streamable_http import EventCallback, EventId, EventMessage, EventStore, StreamId
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from mcp_types import JSONRPCMessage
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logger = logging.getLogger(__name__)
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@dataclass
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class EventEntry:
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"""Represents an event entry in the event store."""
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event_id: EventId
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stream_id: StreamId
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message: JSONRPCMessage | None
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class InMemoryEventStore(EventStore):
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"""Simple in-memory implementation of the EventStore interface for resumability.
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This is primarily intended for examples and testing, not for production use
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where a persistent storage solution would be more appropriate.
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This implementation keeps only the last N events per stream for memory efficiency.
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"""
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def __init__(self, max_events_per_stream: int = 100):
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"""Initialize the event store.
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Args:
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max_events_per_stream: Maximum number of events to keep per stream
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"""
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self.max_events_per_stream = max_events_per_stream
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# for maintaining last N events per stream
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self.streams: dict[StreamId, deque[EventEntry]] = {}
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# event_id -> EventEntry for quick lookup
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self.event_index: dict[EventId, EventEntry] = {}
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async def store_event(self, stream_id: StreamId, message: JSONRPCMessage | None) -> EventId:
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"""Stores an event with a generated event ID."""
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event_id = str(uuid4())
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event_entry = EventEntry(event_id=event_id, stream_id=stream_id, message=message)
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# Get or create deque for this stream
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if stream_id not in self.streams:
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self.streams[stream_id] = deque(maxlen=self.max_events_per_stream)
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# If deque is full, the oldest event will be automatically removed
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# We need to remove it from the event_index as well
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if len(self.streams[stream_id]) == self.max_events_per_stream:
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oldest_event = self.streams[stream_id][0]
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self.event_index.pop(oldest_event.event_id, None)
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# Add new event
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self.streams[stream_id].append(event_entry)
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self.event_index[event_id] = event_entry
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return event_id
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async def replay_events_after(
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self,
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last_event_id: EventId,
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send_callback: EventCallback,
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) -> StreamId | None:
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"""Replays events that occurred after the specified event ID."""
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if last_event_id not in self.event_index:
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logger.warning(f"Event ID {last_event_id} not found in store")
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return None
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# Get the stream and find events after the last one
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last_event = self.event_index[last_event_id]
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stream_id = last_event.stream_id
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stream_events = self.streams.get(last_event.stream_id, deque())
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# Events in deque are already in chronological order
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found_last = False
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for event in stream_events:
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if found_last:
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# Skip priming events (None message)
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if event.message is not None:
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await send_callback(EventMessage(event.message, event.event_id))
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elif event.event_id == last_event_id:
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found_last = True
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return stream_id
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