feat(bedrock.py): Add Cloudflare AI Gateway support

[Manouchehri]

Title

This adds Cloudflare AI Gateway support for Bedrock.

Relevant issues

Resolves #1040.

Type

🆕 New Feature 🚄 Infrastructure

Changes

We add a boto3 hook to modify the URL after signing, but before invoking.

Testing

model_list:
  - model_name: claude-3-haiku-20240307
    litellm_params:
      model: bedrock/anthropic.claude-3-haiku-20240307-v1:0
      aws_region_name: us-east-1
      max_tokens: 4096
      aws_bedrock_runtime_endpoint: https://gateway.ai.cloudflare.com/v1/ACCOUNT_ID_HERE/GATEWAY_ID_HERE/aws-bedrock/bedrock-runtime/us-east-1

curl -v "${OPENAI_API_BASE}/chat/completions" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $OPENAI_API_KEY" \
  -d '{
    "model": "claude-3-haiku-20240307",
    "max_tokens": 100,
    "temperature": 1.0,
    "messages": [
      {
        "role": "user",
        "content": "Tell a joke."
      }
    ]
  }'

Notes

Cloudflare AI Gateway seems to break support for streaming at the moment, not sure why.

curl -v "${OPENAI_API_BASE}/chat/completions" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $OPENAI_API_KEY" \
  -d '{
    "model": "claude-3-haiku-20240307",
    "max_tokens": 100,
    "temperature": 1.0,
    "stream": true,
    "messages": [
      {
        "role": "user",
        "content": "Tell a joke."
      }
    ]
  }'

data: {"error": {"message": "Header length of 3216834560 exceeded the maximum of 131072\n\nTraceback (most recent call last):\n  File \"/usr/local/lib/python3.11/site-packages/litellm/proxy/proxy_server.py\", line 3159, in async_data_generator\n    async for chunk in response:\n  File \"/usr/local/lib/python3.11/site-packages/litellm/utils.py\", line 10971, in __anext__\n    raise e\n  File \"/usr/local/lib/python3.11/site-packages/litellm/utils.py\", line 10903, in __anext__\n    chunk = next(self.completion_stream)\n            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File \"/usr/local/lib/python3.11/site-packages/botocore/eventstream.py\", line 602, in __iter__\n    for event in self._event_generator:\n  File \"/usr/local/lib/python3.11/site-packages/botocore/eventstream.py\", line 611, in _create_raw_event_generator\n    yield from event_stream_buffer\n  File \"/usr/local/lib/python3.11/site-packages/botocore/eventstream.py\", line 544, in __next__\n    return self.next()\n           ^^^^^^^^^^^\n  File \"/usr/local/lib/python3.11/site-packages/botocore/eventstream.py\", line 536, in next\n    self._prelude = self._parse_prelude()\n                    ^^^^^^^^^^^^^^^^^^^^^\n  File \"/usr/local/lib/python3.11/site-packages/botocore/eventstream.py\", line 480, in _parse_prelude\n    self._validate_prelude(prelude)\n  File \"/usr/local/lib/python3.11/site-packages/botocore/eventstream.py\", line 471, in _validate_prelude\n    raise InvalidHeadersLength(prelude.headers_length)\nbotocore.eventstream.InvalidHeadersLength: Header length of 3216834560 exceeded the maximum of 131072\n", "type": "None", "param": "None", "code": 500}}

Pre-Submission Checklist (optional but appreciated):

• [ ] I have included relevant documentation updates (stored in /docs/my-website)

OS Tests (optional but appreciated):

• [ ] Tested on Windows
• [ ] Tested on MacOS
• [X] Tested on Linux

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Name	Status	Preview	Comments	Updated (UTC)
litellm	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 7, 2024 10:51am

[Manouchehri]

please add a test for this @Manouchehri - want to make sure no regressions occur. I believe you can mock bedrock calls

I added a test, let me know if it fails. =)

[Manouchehri]

cd litellm/tests/
poetry run pytest test_bedrock_completion.py::test_completion_bedrock_cloudflare_ai_gateway -s -v

Confirmed, it passes. =)