add feature to download image or video file created locally

[varungup90]

Pull Request Description

Create an image or video

- kubectl -n envoy-gateway-system port-forward service/envoy-aibrix-system-aibrix-eg-903790dc  8888:80

- curl -v "http://localhost:8888/v1/video/generations" \
        -H "Content-Type: application/json" \
        -d '{
           "prompt": "a cute rabbit",
           "model": "hunyuan-dit",
           "save_disk_path": "/shared/2026"
         }'
* Host localhost:8888 was resolved.
* IPv6: ::1
* IPv4: 127.0.0.1
*   Trying [::1]:8888...
* Connected to localhost (::1) port 8888
> POST /v1/video/generations HTTP/1.1
> Host: localhost:8888
> User-Agent: curl/8.9.1
> Accept: */*
> Content-Type: application/json
> Content-Length: 101
> 
* upload completely sent off: 101 bytes
< HTTP/1.1 200 OK
< date: Thu, 25 Sep 2025 20:01:14 GMT
< server: uvicorn
< content-type: application/json
< x-went-into-req-headers: true
< request-id: eb618df8-9260-46e8-870a-9b81e6032412
< target-pod: **10.0.1.147**:6000
< transfer-encoding: chunked
< 
* Connection #0 to host localhost left intact
{"message":"Video generated successfully","elapsed_time":"111.93 sec","output":"/shared/2026/generated_video_20250925-200306.mp4","save_to_disk":true}


- ip is from the target-pod return in the response. port is aibrix-runtime running as a side car container.

- curl -X POST http://localhost:8888/view \
  -H "Content-Type: application/json" \
  --data '{
    "ip": "10.0.1.147", 
    "port": "8080", 
    "path": "//shared/2026/generated_video_20250925-200306.mp4"
  }' \
  -o generated_video_20250925-200306.mp4

Related Issues

Resolves: #[Insert issue number(s)]

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[gemini-code-assist[bot]]

Summary of Changes

Hello @varungup90, I'm Gemini Code Assist[^1]! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the system by enabling the download of locally created media files. It establishes a new /view endpoint in both the Go backend and the Python FastAPI application. The Go endpoint acts as a proxy, allowing clients to request files from internal services, while the FastAPI endpoint directly serves files from the local filesystem with proper content handling. Additionally, the gateway logic has been updated to intelligently route image generation requests based on the presence of a save_disk_path parameter, and necessary Python dependencies have been added.

Highlights

• File Download Feature: Introduced a new capability to download locally generated image or video files through dedicated endpoints.
• Go Backend Endpoint: Added a /view POST endpoint in the Go service (pkg/metadata/handlers.go) to proxy file download requests from specified IP, port, and path.
• Python Frontend Endpoint: Implemented a /view/{file_path:path} GET endpoint in the Python FastAPI application (python/aibrix/aibrix/app.py) to serve local files securely, handling content types and disposition.
• Image Generation Routing Logic: Modified the gateway's request body validation to detect and apply random routing for image generation requests that include a save_disk_path.
• Dependency Update: Integrated aiofiles into the Python project dependencies to support asynchronous file operations.

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[Jeffwan]

@varungup90 @zhangjyr

1. Technically, this is good for debugging but has too many limitations. I suggest we hold this one at this moment and see other ways. I think ask user to decode to image/video is still acceptable or we support object storage later.
2. If we plan to use it, is it possible to move such logics to new created metadata service? let gateway just play the role of forwarding.