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1b1229c867
Fixes CODY-3085
Fixes CODY-3086
Previously, there was no way for OpenAI clients to list the available
models on Sourcegraph or query metadata about a given model ID ("model
ref" using our internal terminology). This PR fixes that problem AND
additionally adds infrastructure to auto-generate Go models from a
TypeSpec specification.
[TypeSpec](https://typespec.io/) is an IDL to document REST APIs,
created by Microsoft. Historically, the Go code in this repository has
been the single source of truth about what exact JSON structures are
expected in HTTP request/response pairs in our REST endpoints. This new
TypeSpec infrastructure allows us to document these shapes at a higher
abstraction level, which has several benefits including automatic
OpenAPI generation, which we can use to generate docs on
sourcegraph.com/docs or automatically generate client bindings in
TypeScript (among many other use-cases).
I am planning to write an RFC to propose we start using TypeSpec for new
REST endpoints going forward. If the RFC is not approved then we can
just delete the new `tools/typespec_codegen` directory and keep the
generated code in the repo. It won't be a big difference in the end
compared our current manual approach of writing Go structs for HTTP
APIs.
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## Test plan
See test cases. I additionally wrote a basic python script with the
official OpenAI client to test that it works with this endpoint. First,
I ran `sg start minimal`. Then I wrote this script
```py
import os
from openai import OpenAI
from dotenv import load_dotenv
import httpx
load_dotenv()
openai = OpenAI(
# base_url="https://api.openai.com/v1",
# api_key=os.getenv("OPENAI_API_KEY"),
base_url="https://sourcegraph.test:3443/api/v1",
api_key=os.getenv("SRC_ACCESS_TOKEN"),
http_client=httpx.Client(verify=False)
)
def main():
response = openai.models.list()
for model in response.data:
print(model.id)
if __name__ == "__main__":
main()
```
Finally, I ran
```
❯ python3 models.py
anthropic::unknown::claude-3-haiku-20240307
anthropic::unknown::claude-3-sonnet-20240229
fireworks::unknown::starcoder
```
<!-- REQUIRED; info at
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-->
## Changelog
* New `GET /.api/llm/models` and `GET /.api/llm/models/{modelId}` REST
API endpoints to list available LLM models on the instance and to get
information about a given model. This endpoints is compatible with the
`/models` and `/models/{modelId}` endpoints from OpenAI.
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