refactor: add prefix support for storage column configuration and update blob path generation

config.yaml

@@ -71,6 +71,7 @@ jobs:
         - source: DATA
           target: FILE_URL
           mode: REFERENCE_ONLY
+          prefix: Infraestructura/SITE_HOLDER__ATTACH
     batches_per_partition: 20
     max_extractors: 32
     extractor_batch_size: 1

internal/app/azure/main.go

@@ -4,10 +4,13 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"net/http"
 	"net/url"
+	"path"
 
 	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/config"
 	"github.com/Azure/azure-sdk-for-go/sdk/storage/azblob"
+	"github.com/Azure/azure-sdk-for-go/sdk/storage/azblob/blob"
 )
 
 var (
@@ -72,16 +75,15 @@ func (c *Client) UploadAndGetURL(ctx context.Context, blobPath string, buffer []
 		return "", ErrInvalidInput
 	}
 
-	fullPath := blobPath
-	if c.azureStorageConfig.Prefix != "" {
-		fullPath, _ = url.JoinPath(c.azureStorageConfig.Prefix, blobPath)
+	fullPath := path.Join(c.azureStorageConfig.Prefix, blobPath)
+
+	contentType := http.DetectContentType(buffer)
+	opts := &azblob.UploadBufferOptions{
+		HTTPHeaders: &blob.HTTPHeaders{BlobContentType: &contentType},
+	}
+	if _, err := c.client.UploadBuffer(ctx, c.azureStorageConfig.Container, fullPath, buffer, opts); err != nil {
+		return "", fmt.Errorf("uploading blob %s: %w", fullPath, err)
 	}
 
-	if err := c.UploadBuffer(ctx, c.azureStorageConfig.Container, fullPath, buffer); err != nil {
-		return "", err
-	}
-
-	blobEndpoint, _ := url.JoinPath(c.azureStorageConfig.ServiceURL, c.azureStorageConfig.AccountName)
-	blobURL, _ := url.JoinPath(blobEndpoint, c.azureStorageConfig.Container, fullPath)
-	return blobURL, nil
+	return fullPath, nil
 }

internal/app/config/migration.go

@@ -20,6 +20,7 @@ type ToStorageColumnConfig struct {
 	Source string `yaml:"source"`
 	Target string `yaml:"target"`
 	Mode   string `yaml:"mode"`
+	Prefix string `yaml:"prefix"`
 }
 
 type ToStorageConfig struct {

internal/app/etl/transformers/plan.go

@@ -3,6 +3,7 @@ package transformers
 import (
 	"context"
 	"fmt"
+	"path"
 	"strings"
 	"time"
 
@@ -99,12 +100,11 @@ func computeStorageTransformationPlan(
 				}
 				b, ok := v.([]byte)
 				if !ok {
-					logrus.Warnf("to_storage: expected []byte for %s.%s.%s, got %T — passing through",
-						schema, table, sourceColName, v)
+					logrus.Warnf("to_storage: expected []byte for %s.%s.%s, got %T — passing through", schema, table, sourceColName, v)
 					return v, nil
 				}
 				// start := time.Now()
-				blobPath := fmt.Sprintf("%s/%s/%s", schema, table, uuid.New().String())
+				blobPath := path.Join(storageCol.Prefix, uuid.New().String())
 				blobURL, err := azureClient.UploadAndGetURL(ctx, blobPath, b)
 				if err != nil {
 					return nil, &custom_errors.JobError{