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middleware.py
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# Copyright © 2011-2026 Splunk, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License"): you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
from collections.abc import Awaitable, Callable
from dataclasses import dataclass
from typing import Any, override
from splunklib.ai.messages import (
AgentResponse,
AIMessage,
BaseMessage,
SubagentCall,
SubagentFailureResult,
SubagentStructuredResult,
SubagentTextResult,
ToolCall,
ToolFailureResult,
ToolResult,
)
@dataclass(frozen=True)
class AgentState:
"""AgentState is available through certain middlewares and contains information about the current state of an agent execution."""
# holds messages exchanged so far in the conversation
response: AgentResponse[Any | None]
# steps taken so far in the conversation
total_steps: int
# tokens used so far in the conversation
token_count: int
@dataclass(frozen=True)
class ToolRequest:
call: ToolCall
state: AgentState
@dataclass(frozen=True)
class ToolResponse:
result: ToolResult | ToolFailureResult
ToolMiddlewareHandler = Callable[[ToolRequest], Awaitable[ToolResponse]]
@dataclass(frozen=True)
class SubagentRequest:
call: SubagentCall
state: AgentState
@dataclass(frozen=True)
class SubagentResponse:
result: SubagentStructuredResult | SubagentTextResult | SubagentFailureResult
SubagentMiddlewareHandler = Callable[
[SubagentRequest],
Awaitable[SubagentResponse],
]
@dataclass(frozen=True)
class ModelRequest:
system_message: str
state: AgentState
@dataclass(frozen=True)
class ModelResponse:
message: AIMessage
structured_output: Any | None = None
def __post_init__(self) -> None:
if len(self.message.structured_output_calls) > 1:
raise AssertionError(
f"len(message.structured_output_calls) is not equal to 0 or 1 but {len(self.message.structured_output_calls)}"
)
ModelMiddlewareHandler = Callable[[ModelRequest], Awaitable[ModelResponse]]
@dataclass(frozen=True)
class AgentRequest:
messages: list[BaseMessage]
AgentMiddlewareHandler = Callable[[AgentRequest], Awaitable[AgentResponse[Any | None]]]
class AgentMiddleware:
async def tool_middleware(
self,
request: ToolRequest,
handler: ToolMiddlewareHandler,
) -> ToolResponse:
"""Executed in between tool calls"""
return await handler(request)
async def subagent_middleware(
self,
request: SubagentRequest,
handler: SubagentMiddlewareHandler,
) -> SubagentResponse:
"""Executed in between subagent calls"""
return await handler(request)
async def model_middleware(
self,
request: ModelRequest,
handler: ModelMiddlewareHandler,
) -> ModelResponse:
"""Executed in between the LLM calls"""
return await handler(request)
async def agent_middleware(
self,
request: AgentRequest,
handler: AgentMiddlewareHandler,
) -> AgentResponse[Any | None]:
"""Executed in between invoke"""
return await handler(request)
def tool_middleware(
func: Callable[[ToolRequest, ToolMiddlewareHandler], Awaitable[ToolResponse]],
) -> AgentMiddleware:
class _CustomMiddleware(AgentMiddleware):
@override
async def tool_middleware(
self,
request: ToolRequest,
handler: ToolMiddlewareHandler,
) -> ToolResponse:
return await func(request, handler)
return _CustomMiddleware()
def subagent_middleware(
func: Callable[
[SubagentRequest, SubagentMiddlewareHandler],
Awaitable[SubagentResponse],
],
) -> AgentMiddleware:
class _CustomMiddleware(AgentMiddleware):
@override
async def subagent_middleware(
self,
request: SubagentRequest,
handler: SubagentMiddlewareHandler,
) -> SubagentResponse:
return await func(request, handler)
return _CustomMiddleware()
def model_middleware(
func: Callable[[ModelRequest, ModelMiddlewareHandler], Awaitable[ModelResponse]],
) -> AgentMiddleware:
class _CustomMiddleware(AgentMiddleware):
@override
async def model_middleware(
self,
request: ModelRequest,
handler: ModelMiddlewareHandler,
) -> ModelResponse:
return await func(request, handler)
return _CustomMiddleware()
def agent_middleware(
func: Callable[
[AgentRequest, AgentMiddlewareHandler], Awaitable[AgentResponse[Any | None]]
],
) -> AgentMiddleware:
class _CustomMiddleware(AgentMiddleware):
@override
async def agent_middleware(
self,
request: AgentRequest,
handler: AgentMiddlewareHandler,
) -> AgentResponse[Any | None]:
return await func(request, handler)
return _CustomMiddleware()