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upload_file.go
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upload_file.go
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// Copyright 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package objects
// [START storage_upload_file]
import (
"context"
"fmt"
"io"
"os"
"time"
"cloud.google.com/go/storage"
)
// uploadFile uploads an object.
func uploadFile(w io.Writer, bucket, object string) error {
// bucket := "bucket-name"
// object := "object-name"
ctx := context.Background()
client, err := storage.NewClient(ctx)
if err != nil {
return fmt.Errorf("storage.NewClient: %w", err)
}
defer client.Close()
// Open local file.
f, err := os.Open("notes.txt")
if err != nil {
return fmt.Errorf("os.Open: %w", err)
}
defer f.Close()
ctx, cancel := context.WithTimeout(ctx, time.Second*50)
defer cancel()
o := client.Bucket(bucket).Object(object)
// Optional: set a generation-match precondition to avoid potential race
// conditions and data corruptions. The request to upload is aborted if the
// object's generation number does not match your precondition.
// For an object that does not yet exist, set the DoesNotExist precondition.
o = o.If(storage.Conditions{DoesNotExist: true})
// If the live object already exists in your bucket, set instead a
// generation-match precondition using the live object's generation number.
// attrs, err := o.Attrs(ctx)
// if err != nil {
// return fmt.Errorf("object.Attrs: %w", err)
// }
// o = o.If(storage.Conditions{GenerationMatch: attrs.Generation})
// Upload an object with storage.Writer.
wc := o.NewWriter(ctx)
if _, err = io.Copy(wc, f); err != nil {
return fmt.Errorf("io.Copy: %w", err)
}
if err := wc.Close(); err != nil {
return fmt.Errorf("Writer.Close: %w", err)
}
fmt.Fprintf(w, "Blob %v uploaded.\n", object)
return nil
}
// [END storage_upload_file]