Cloud Storage supports streaming transfers, which allow you to stream data to and from your Cloud Storage account without requiring that the data first be saved to a file. Streaming transfers are useful when you want to upload data generated from a process directly into Cloud Storage, or when you want to download data from Cloud Storage into a process.
You can perform streaming transfers by using the gsutil command-line tool. The third-party boto client library plugin for Cloud Storage also supports streaming transfers.
Streaming uploads and downloads using gsutil
To use gsutil to perform a streaming upload from a process to a
Cloud Storage object, pipe the data to the gsutil cp command and
use a dash for the source URL.
The following example streams the data produced by the collect_measurements
process into the data_measurements Cloud Storage object:
collect_measurements | gsutil cp - gs://my_app_bucket/data_measurements
To use gsutil to perform a streaming download from a Cloud Storage object
to a process, run the gsutil cp command and use a dash for the
destination URL, then pipe the data to the process.
The following example streams the data from the data_measurements
Cloud Storage object to the analyze_data process:
gsutil cp gs://my_app_bucket/data_measurements - | analyze_data
You can also stream data from a Cloud Storage object to a standard Linux command like sort:
gsutil cp gs://my_app_bucket/data_measurements - | sort
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