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# What does this PR do? <!-- Provide a short summary of what this PR does and why. Link to relevant issues if applicable. --> This PR adds support for the new Streamable HTTP transport for MCP, as well as falling back to the SSE protocol if the Streamable HTTP connection fails. <!-- If resolving an issue, uncomment and update the line below --> Closes #2542 ## Test Plan <!-- Describe the tests you ran to verify your changes with result summaries. *Provide clear instructions so the plan can be easily re-executed.* --> --------- Signed-off-by: Calum Murray <cmurray@redhat.com>
70 lines
2 KiB
Python
70 lines
2 KiB
Python
# Copyright (c) Meta Platforms, Inc. and affiliates.
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# All rights reserved.
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#
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# This source code is licensed under the terms described in the LICENSE file in
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# the root directory of this source tree.
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import time
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from threading import RLock
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from typing import Any
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class TTLDict(dict):
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"""
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A dictionary with a ttl for each item
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"""
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def __init__(self, ttl_seconds: float, *args, **kwargs):
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super().__init__(*args, **kwargs)
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self.ttl_seconds = ttl_seconds
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self._expires: dict[Any, Any] = {} # expires holds when an item will expire
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self._lock = RLock()
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if args or kwargs:
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for k, v in self.items():
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self.__setitem__(k, v)
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def __delitem__(self, key):
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with self._lock:
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del self._expires[key]
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super().__delitem__(key)
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def __setitem__(self, key, value):
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with self._lock:
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self._expires[key] = time.monotonic() + self.ttl_seconds
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super().__setitem__(key, value)
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def _is_expired(self, key):
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if key not in self._expires:
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return False
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return time.monotonic() > self._expires[key]
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def __getitem__(self, key):
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with self._lock:
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if self._is_expired(key):
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del self._expires[key]
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super().__delitem__(key)
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raise KeyError(f"{key} has expired and was removed")
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return super().__getitem__(key)
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def get(self, key, default=None):
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try:
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return self[key]
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except KeyError:
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return default
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def __contains__(self, key):
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try:
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_ = self[key]
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return True
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except KeyError:
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return False
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def __repr__(self):
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with self._lock:
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for key in self.keys():
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if self._is_expired(key):
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del self._expires[key]
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super().__delitem__(key)
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return f"TTLDict({self.ttl_seconds}, {super().__repr__()})"
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