forked from phoenix-oss/llama-stack-mirror
52 lines
1.8 KiB
Python
52 lines
1.8 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 asyncio
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from typing import List
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from llama_models.llama3_1.api.datatypes import Message, Role
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from .base import OnViolationAction, ShieldBase, ShieldResponse
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class SafetyException(Exception): # noqa: N818
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def __init__(self, response: ShieldResponse):
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self.response = response
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super().__init__(response.violation_return_message)
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class ShieldRunnerMixin:
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def __init__(
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self,
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input_shields: List[ShieldBase] = None,
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output_shields: List[ShieldBase] = None,
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):
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self.input_shields = input_shields
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self.output_shields = output_shields
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async def run_shields(
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self, messages: List[Message], shields: List[ShieldBase]
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) -> List[ShieldResponse]:
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# some shields like llama-guard require the first message to be a user message
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# since this might be a tool call, first role might not be user
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if len(messages) > 0 and messages[0].role != Role.user.value:
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# TODO(ashwin): we need to change the type of the message, this kind of modification
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# is no longer appropriate
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messages[0].role = Role.user.value
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results = await asyncio.gather(*[s.run(messages) for s in shields])
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for shield, r in zip(shields, results):
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if r.is_violation:
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if shield.on_violation_action == OnViolationAction.RAISE:
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raise SafetyException(r)
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elif shield.on_violation_action == OnViolationAction.WARN:
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cprint(
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f"[Warn]{shield.__class__.__name__} raised a warning",
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color="red",
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)
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return results
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