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// Copyright 2021 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
//
// http://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.
/**
* This application demonstrates how to perform basic operations on files with
* the Google Cloud Storage API.
*
* For more information, see the README.md under /storage and the documentation
* at https://cloud.google.com/storage/docs.
*/
const
path
=
require
(
'path'
)
;
const
cwd
=
path
.
join
(
__dirname
,
'..'
)
;
const
fs
=
require
(
'fs'
)
;
function
main
(
bucketName
=
'my-bucket'
,
fileName
=
'test.txt'
,
destFileName
=
path
.
join
(
cwd
,
'downloaded.txt'
)
)
{
// [START storage_stream_file_download]
/**
* TODO(developer): Uncomment the following lines before running the sample.
*/
// The ID of your GCS bucket
// const bucketName = 'your-unique-bucket-name';
// The ID of your GCS file
// const fileName = 'your-file-name';
// The filename and file path where you want to download the file
// const destFileName = '/local/path/to/file.txt';
// Imports the Google Cloud client library
const
{
Storage
}
=
require
(
'@google-cloud/storage'
)
;
// Creates a client
const
storage
=
new
Storage
(
)
;
async
function
streamFileDownload
(
)
{
// The example below demonstrates how we can reference a remote file, then
// pipe its contents to a local file.
// Once the stream is created, the data can be piped anywhere (process, sdout, etc)
await
storage
.
bucket
(
bucketName
)
.
file
(
fileName
)
.
createReadStream
(
)
//stream is created
.
pipe
(
fs
.
createWriteStream
(
destFileName
)
)
.
on
(
'finish'
,
(
)
=>
{
// The file download is complete
}
)
;
console
.
log
(
`gs://
${
bucketName
}
/
${
fileName
}
downloaded to
${
destFileName
}
.`
)
;
}
streamFileDownload
(
)
.
catch
(
console
.
error
)
;
// [END storage_stream_file_download]
}
main
(
...
process
.
argv
.
slice
(
2
)
)
;
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