134 lines
2.9 KiB
Go
134 lines
2.9 KiB
Go
// Copyright 2017, Google
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// This is a simple program that will copy named files into or out of B2.
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//
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// To copy a file into B2:
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//
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// B2_ACCOUNT_ID=foo B2_ACCOUNT_KEY=bar simple /path/to/file b2://bucket/path/to/dst
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//
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// To copy a file out:
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//
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// B2_ACCOUNT_ID=foo B2_ACCOUNT_KEY=bar simple b2://bucket/path/to/file /path/to/dst
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package main
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import (
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"context"
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"flag"
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"fmt"
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"io"
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"net/url"
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"os"
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"strings"
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"github.com/kurin/blazer/b2"
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)
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func main() {
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flag.Parse()
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b2id := os.Getenv("B2_ACCOUNT_ID")
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b2key := os.Getenv("B2_ACCOUNT_KEY")
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args := flag.Args()
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if len(args) != 2 {
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fmt.Printf("Usage:\n\nsimple [src] [dst]\n")
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return
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}
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src, dst := args[0], args[1]
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ctx := context.Background()
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c, err := b2.NewClient(ctx, b2id, b2key)
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if err != nil {
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fmt.Println(err)
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return
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}
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var r io.ReadCloser
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var w io.WriteCloser
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if strings.HasPrefix(src, "b2://") {
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reader, err := b2Reader(ctx, c, src)
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if err != nil {
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fmt.Println(err)
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return
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}
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r = reader
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} else {
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f, err := os.Open(src)
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if err != nil {
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fmt.Println(err)
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return
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}
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r = f
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}
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// Readers do not need their errors checked on close. (Also it's a little
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// silly to defer this in main(), but.)
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defer r.Close()
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if strings.HasPrefix(dst, "b2://") {
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writer, err := b2Writer(ctx, c, dst)
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if err != nil {
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fmt.Println(err)
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return
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}
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w = writer
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} else {
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f, err := os.Create(dst)
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if err != nil {
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fmt.Println(err)
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return
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}
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w = f
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}
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// Copy and check error.
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if _, err := io.Copy(w, r); err != nil {
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fmt.Println(err)
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return
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}
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// It is very important to check the error of the writer.
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if err := w.Close(); err != nil {
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fmt.Println(err)
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}
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}
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func b2Reader(ctx context.Context, c *b2.Client, path string) (io.ReadCloser, error) {
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o, err := b2Obj(ctx, c, path)
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if err != nil {
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return nil, err
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}
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return o.NewReader(ctx), nil
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}
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func b2Writer(ctx context.Context, c *b2.Client, path string) (io.WriteCloser, error) {
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o, err := b2Obj(ctx, c, path)
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if err != nil {
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return nil, err
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}
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return o.NewWriter(ctx), nil
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}
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func b2Obj(ctx context.Context, c *b2.Client, path string) (*b2.Object, error) {
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uri, err := url.Parse(path)
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if err != nil {
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return nil, err
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}
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bucket, err := c.Bucket(ctx, uri.Host)
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if err != nil {
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return nil, err
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}
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// B2 paths must not begin with /, so trim it here.
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return bucket.Object(strings.TrimPrefix(uri.Path, "/")), nil
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}
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