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Propagate contextvars.Context through anyio streams without modifying SessionMessage (#2298)

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Marcelo Trylesinski 2026-03-31 12:49:38 -04:00 • committed by GitHub
commit e6235d1667
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1 changed files with 310 additions and 94 deletions
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10
tests/shared/test_streamable_http.py
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@ -45,6 +45,7 @@ from mcp.server.streamable_http import (
from mcp.server.streamable_http_manager import StreamableHTTPSessionManager
from mcp.server.transport_security import TransportSecuritySettings
from mcp.shared._context import RequestContext
from mcp.shared._context_streams import create_context_streams
from mcp.shared._httpx_utils import (
MCP_DEFAULT_SSE_READ_TIMEOUT,
MCP_DEFAULT_TIMEOUT,
@ -1783,8 +1784,8 @@ async def test_handle_sse_event_skips_empty_data():
# Create a mock SSE event with empty data (keep-alive ping)
mock_sse = ServerSentEvent(event="message", data="", id=None, retry=None)
# Create a mock stream writer
write_stream, read_stream = anyio.create_memory_object_stream[SessionMessage | Exception](1)
# Create a context-aware stream writer (matches StreamWriter type alias)
write_stream, read_stream = create_context_streams[SessionMessage | Exception](1)
try:
# Call _handle_sse_event with empty data - should return False and not raise
@ -1794,8 +1795,9 @@ async def test_handle_sse_event_skips_empty_data():
assert result is False
# Nothing should have been written to the stream
# Check buffer is empty (statistics().current_buffer_used returns buffer size)
assert write_stream.statistics().current_buffer_used == 0
with pytest.raises(TimeoutError):
with anyio.fail_after(0):
await read_stream.receive()
finally:
await write_stream.aclose()
await read_stream.aclose()