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64 lines
2.2 KiB
Python
64 lines
2.2 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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from typing import List
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from llama_models.llama3_1.api.datatypes import Message, Role
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from llama_toolchain.safety.api.datatypes import (
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OnViolationAction,
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ShieldDefinition,
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ShieldResponse,
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)
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from llama_toolchain.safety.api.endpoints import RunShieldRequest, Safety
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from termcolor import cprint
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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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safety_api: Safety,
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input_shields: List[ShieldDefinition] = None,
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output_shields: List[ShieldDefinition] = None,
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):
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self.safety_api = safety_api
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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[ShieldDefinition]
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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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res = await self.safety_api.run_shields(
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RunShieldRequest(
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messages=messages,
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shields=shields,
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)
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)
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results = res.responses
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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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