Gcs Streaming file output plugin for Embulk

Google Cloud Storage (GCS) Streaming file output plugin for Embulk.
No use local storage when upload to GCS. Using Streaming transfers.

• Plugin type: file output
• Load all or nothing: no
• Resume supported: no
• Cleanup supported: yes

• project_id: Google Cloud Platform Project ID (string, required)
• bucket: Google Cloud Storage bucket name (string, required)
• path_prefix: Prefix of output keys (string, required)
• file_ext: Extension of output file (string, required)
• sequence_format: Format of the sequence number of the output files (string, default value is .%03d.%02d.)
• content_type: Content-Type of output file (string, optional, default value is application/octet-stream)
• json_keyfile: Full path of json_key (string, optional)

If you do not set service account json_keyfile, this plugin uses a library called Application Default Credentials (ADC) to automatically find your service account credentials.

1. If the environment variable GOOGLE_APPLICATION_CREDENTIALS is set, ADC uses the service account file that the variable points to.
2. If the environment variable GOOGLE_APPLICATION_CREDENTIALS isn't set, ADC uses the default service account that GCP services provide.

Following Authenticating as a service account.

out:
  type: gcs_streaming
  project_id: project
  bucket: budket
  path_prefix: path/to/file
  file_ext: csv
  formatter:
    type: csv

$ ./gradlew gem  # -t to watch change of files and rebuild continuously

Prepare

    /*
     * This test case requires environment variables
     *   GCP_PROJECT_ID
     *   GCP_BUCKET
     *   GCP_JSON_KEYFILE
     * And prepare gcloud authentication ADC, following command.
     *   $ gcloud auth application-default login
     */

Run

$ ./gradlew test