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import asyncio
import threading
from datetime import datetime
from typing import List, Optional
import httpx
from litellm._logging import verbose_proxy_logger
from litellm.litellm_core_utils.litellm_logging import Logging as LiteLLMLoggingObj
from litellm.proxy._types import PassThroughEndpointLoggingResultValues
from litellm.types.utils import StandardPassThroughResponseObject
from .llm_provider_handlers.anthropic_passthrough_logging_handler import (
AnthropicPassthroughLoggingHandler,
)
from .llm_provider_handlers.vertex_passthrough_logging_handler import (
VertexPassthroughLoggingHandler,
)
from .success_handler import PassThroughEndpointLogging
from .types import EndpointType
class PassThroughStreamingHandler:
@staticmethod
async def chunk_processor(
response: httpx.Response,
request_body: Optional[dict],
litellm_logging_obj: LiteLLMLoggingObj,
endpoint_type: EndpointType,
start_time: datetime,
passthrough_success_handler_obj: PassThroughEndpointLogging,
url_route: str,
):
"""
- Yields chunks from the response
- Collect non-empty chunks for post-processing (logging)
"""
try:
raw_bytes: List[bytes] = []
async for chunk in response.aiter_bytes():
raw_bytes.append(chunk)
yield chunk
# After all chunks are processed, handle post-processing
end_time = datetime.now()
asyncio.create_task(
PassThroughStreamingHandler._route_streaming_logging_to_handler(
litellm_logging_obj=litellm_logging_obj,
passthrough_success_handler_obj=passthrough_success_handler_obj,
url_route=url_route,
request_body=request_body or {},
endpoint_type=endpoint_type,
start_time=start_time,
raw_bytes=raw_bytes,
end_time=end_time,
)
)
except Exception as e:
verbose_proxy_logger.error(f"Error in chunk_processor: {str(e)}")
raise
@staticmethod
async def _route_streaming_logging_to_handler(
litellm_logging_obj: LiteLLMLoggingObj,
passthrough_success_handler_obj: PassThroughEndpointLogging,
url_route: str,
request_body: dict,
endpoint_type: EndpointType,
start_time: datetime,
raw_bytes: List[bytes],
end_time: datetime,
):
"""
Route the logging for the collected chunks to the appropriate handler
Supported endpoint types:
- Anthropic
- Vertex AI
"""
all_chunks = PassThroughStreamingHandler._convert_raw_bytes_to_str_lines(
raw_bytes
)
standard_logging_response_object: Optional[
PassThroughEndpointLoggingResultValues
] = None
kwargs: dict = {}
if endpoint_type == EndpointType.ANTHROPIC:
anthropic_passthrough_logging_handler_result = AnthropicPassthroughLoggingHandler._handle_logging_anthropic_collected_chunks(
litellm_logging_obj=litellm_logging_obj,
passthrough_success_handler_obj=passthrough_success_handler_obj,
url_route=url_route,
request_body=request_body,
endpoint_type=endpoint_type,
start_time=start_time,
all_chunks=all_chunks,
end_time=end_time,
)
standard_logging_response_object = (
anthropic_passthrough_logging_handler_result["result"]
)
kwargs = anthropic_passthrough_logging_handler_result["kwargs"]
elif endpoint_type == EndpointType.VERTEX_AI:
vertex_passthrough_logging_handler_result = (
VertexPassthroughLoggingHandler._handle_logging_vertex_collected_chunks(
litellm_logging_obj=litellm_logging_obj,
passthrough_success_handler_obj=passthrough_success_handler_obj,
url_route=url_route,
request_body=request_body,
endpoint_type=endpoint_type,
start_time=start_time,
all_chunks=all_chunks,
end_time=end_time,
)
)
standard_logging_response_object = (
vertex_passthrough_logging_handler_result["result"]
)
kwargs = vertex_passthrough_logging_handler_result["kwargs"]
if standard_logging_response_object is None:
standard_logging_response_object = StandardPassThroughResponseObject(
response=f"cannot parse chunks to standard response object. Chunks={all_chunks}"
)
threading.Thread(
target=litellm_logging_obj.success_handler,
args=(
standard_logging_response_object,
start_time,
end_time,
False,
),
).start()
await litellm_logging_obj.async_success_handler(
result=standard_logging_response_object,
start_time=start_time,
end_time=end_time,
cache_hit=False,
**kwargs,
)
@staticmethod
def _convert_raw_bytes_to_str_lines(raw_bytes: List[bytes]) -> List[str]:
"""
Converts a list of raw bytes into a list of string lines, similar to aiter_lines()
Args:
raw_bytes: List of bytes chunks from aiter.bytes()
Returns:
List of string lines, with each line being a complete data: {} chunk
"""
# Combine all bytes and decode to string
combined_str = b"".join(raw_bytes).decode("utf-8")
# Split by newlines and filter out empty lines
lines = [line.strip() for line in combined_str.split("\n") if line.strip()]
return lines
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