file-server/

File upload server

This example demonstrates how to build a simple file upload endpoint with swagger and go-swagger.

Try it

1. Build the server

cd restapi/cmd/file-upload-server
go build

./file-upload-server --port 8000
2021/01/17 18:54:09 Serving file upload at http://127.0.0.1:8000

1. Run the client

From another terminal:

go run upload_file.go swagger.yml

Logs on the server:

2021/01/17 18:54:15 received file name: swagger.yml
2021/01/17 18:54:15 received file size: 512
2021/01/17 18:54:15 copied bytes 512
2021/01/17 18:54:15 file uploaded copied as upload427417421/uploaded_file_0.dat

The file has been copied in a temporary folder cmd/file-upload-server/upload*/

Specification

We use the swagger type file in a multipart form, like so:

paths:
  /upload:
    post:
      consumes:
      - multipart/form-data
      parameters:
      - name: file
        in: formData
        type: file

Server side

The handler receives a io.ReadCloser as the file to consume.

Under the hood, the runtime builds this with a *runtime.File, which provides access to some header information, such as:

		if namedFile, ok := params.File.(*runtime.File); ok {
			log.Printf("received file name: %s", namedFile.Header.Filename)
			log.Printf("received file size: %d", namedFile.Header.Size)
		}

Client side

The local file is handled as a runtime.NamedReadCloser (that is, a io.ReadCloser plus the Name() string method). A regular os.File satisfies this.

The file can be passed directly to the client method, like so:

	params := uploads.NewUploadFileParams().WithFile(reader)

	_, err := uploader.Uploads.UploadFile(params)