fix(sagemaker.py): fix streaming logic

litellm/llms/sagemaker/sagemaker.py

@@ -27,6 +27,7 @@ from litellm.types.llms.openai import (
     ChatCompletionUsageBlock,
 )
 from litellm.types.utils import GenericStreamingChunk as GChunk
+from litellm.types.utils import StreamingChatCompletionChunk
 from litellm.utils import (
     CustomStreamWrapper,
     EmbeddingResponse,
@@ -35,8 +36,8 @@ from litellm.utils import (
     get_secret,
 )
 
-from .base_aws_llm import BaseAWSLLM
-from .prompt_templates.factory import custom_prompt, prompt_factory
+from ..base_aws_llm import BaseAWSLLM
+from ..prompt_templates.factory import custom_prompt, prompt_factory
 
 _response_stream_shape_cache = None
 
@@ -285,6 +286,10 @@ class SagemakerLLM(BaseAWSLLM):
                 aws_region_name=aws_region_name,
             )
 
+            custom_stream_decoder = AWSEventStreamDecoder(
+                model="", is_messages_api=True
+            )
+
             return openai_like_chat_completions.completion(
                 model=model,
                 messages=messages,
@@ -303,6 +308,7 @@ class SagemakerLLM(BaseAWSLLM):
                 headers=prepared_request.headers,
                 custom_endpoint=True,
                 custom_llm_provider="sagemaker_chat",
+                streaming_decoder=custom_stream_decoder,  # type: ignore
             )
 
         ## Load Config
@@ -937,12 +943,21 @@ def get_response_stream_shape():
 
 
 class AWSEventStreamDecoder:
-    def __init__(self, model: str) -> None:
+    def __init__(self, model: str, is_messages_api: Optional[bool] = None) -> None:
         from botocore.parsers import EventStreamJSONParser
 
         self.model = model
         self.parser = EventStreamJSONParser()
         self.content_blocks: List = []
+        self.is_messages_api = is_messages_api
+
+    def _chunk_parser_messages_api(
+        self, chunk_data: dict
+    ) -> StreamingChatCompletionChunk:
+
+        openai_chunk = StreamingChatCompletionChunk(**chunk_data)
+
+        return openai_chunk
 
     def _chunk_parser(self, chunk_data: dict) -> GChunk:
         verbose_logger.debug("in sagemaker chunk parser, chunk_data %s", chunk_data)
@@ -958,6 +973,7 @@ class AWSEventStreamDecoder:
                 index=_index,
                 is_finished=True,
                 finish_reason="stop",
+                usage=None,
             )
 
         return GChunk(
@@ -965,9 +981,12 @@ class AWSEventStreamDecoder:
             index=_index,
             is_finished=is_finished,
             finish_reason=finish_reason,
+            usage=None,
         )
 
-    def iter_bytes(self, iterator: Iterator[bytes]) -> Iterator[GChunk]:
+    def iter_bytes(
+        self, iterator: Iterator[bytes]
+    ) -> Iterator[Optional[Union[GChunk, StreamingChatCompletionChunk]]]:
         """Given an iterator that yields lines, iterate over it & yield every event encountered"""
         from botocore.eventstream import EventStreamBuffer
 
@@ -988,6 +1007,9 @@ class AWSEventStreamDecoder:
                     # Try to parse the accumulated JSON
                     try:
                         _data = json.loads(accumulated_json)
+                        if self.is_messages_api:
+                            yield self._chunk_parser_messages_api(chunk_data=_data)
+                        else:
                             yield self._chunk_parser(chunk_data=_data)
                         # Reset accumulated_json after successful parsing
                         accumulated_json = ""
@@ -999,16 +1021,20 @@ class AWSEventStreamDecoder:
         if accumulated_json:
             try:
                 _data = json.loads(accumulated_json)
+                if self.is_messages_api:
+                    yield self._chunk_parser_messages_api(chunk_data=_data)
+                else:
                     yield self._chunk_parser(chunk_data=_data)
-            except json.JSONDecodeError:
+            except json.JSONDecodeError as e:
                 # Handle or log any unparseable data at the end
                 verbose_logger.error(
                     f"Warning: Unparseable JSON data remained: {accumulated_json}"
                 )
+                yield None
 
     async def aiter_bytes(
         self, iterator: AsyncIterator[bytes]
-    ) -> AsyncIterator[GChunk]:
+    ) -> AsyncIterator[Optional[Union[GChunk, StreamingChatCompletionChunk]]]:
         """Given an async iterator that yields lines, iterate over it & yield every event encountered"""
         from botocore.eventstream import EventStreamBuffer
 
@@ -1030,6 +1056,9 @@ class AWSEventStreamDecoder:
                     # Try to parse the accumulated JSON
                     try:
                         _data = json.loads(accumulated_json)
+                        if self.is_messages_api:
+                            yield self._chunk_parser_messages_api(chunk_data=_data)
+                        else:
                             yield self._chunk_parser(chunk_data=_data)
                         # Reset accumulated_json after successful parsing
                         accumulated_json = ""
@@ -1041,12 +1070,16 @@ class AWSEventStreamDecoder:
         if accumulated_json:
             try:
                 _data = json.loads(accumulated_json)
+                if self.is_messages_api:
+                    yield self._chunk_parser_messages_api(chunk_data=_data)
+                else:
                     yield self._chunk_parser(chunk_data=_data)
             except json.JSONDecodeError:
                 # Handle or log any unparseable data at the end
                 verbose_logger.error(
                     f"Warning: Unparseable JSON data remained: {accumulated_json}"
                 )
+                yield None
 
     def _parse_message_from_event(self, event) -> Optional[str]:
         response_dict = event.to_response_dict()