appendBlobTest.go

package main

import (
	"bytes"
	"context"
	"fmt"
	"github.com/Azure/azure-storage-blob-go/azblob"
	"mime/multipart"
	"net/http/httptest"
	"net/url"
	"reflect"
)

func main() {
	body := &bytes.Buffer{}
	writer := multipart.NewWriter(body)
	part, err := writer.CreateFormFile("file.txt", "file.txt")
	if err != nil {
		panic(err)
	}
	part.Write([]byte("file contents"))
	writer.Close()

	r := httptest.NewRequest("POST", "/", body)
	r.Header.Add("Content-Type", writer.FormDataContentType())

	file, _, err := r.FormFile("file.txt")
	if err != nil {
		panic(err)
	}

	fmt.Println(reflect.ValueOf(file).Kind()) // struct
	fmt.Println(reflect.ValueOf(file).Kind() == reflect.Struct)

	var v *multipart.File
	v = &file
	fmt.Println(reflect.ValueOf(v).Kind()) // ptr

	if err := Upload(v); err != nil {
		panic(err)
	}
}

func Upload(file *multipart.File) error {
	u, _ := url.Parse("blob url")
	appendBlobURL := azblob.NewAppendBlobURL(
		*u,
		azblob.NewPipeline(nil, azblob.PipelineOptions{}),
	)

	// What do I do here?
	_, err := appendBlobURL.AppendBlock(context.Background(), file, azblob.AppendBlobAccessConditions{}, nil)
	return err
}