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gcloud-storage-emulator

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gcloud-storage-emulator

A stub emulator for the Google Cloud Storage API

  • 0.5.0
  • PyPI
  • Socket score

Maintainers
1

Local Emulator for Google Cloud Storage

Google doesn't (yet) ship an emulator for the Cloud Storage API like they do for Cloud Datastore.

This is a stub emulator so you can run your tests and do local development without having to connect to the production Storage APIs.

THIS IS A WORK IN PROGRESS AND ONLY SUPPORTS A LIMITED SUBSET OF THE API


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Installation

pip install gcloud-storage-emulator

CLI Usage

Starting the emulator

Start the emulator with:

$ gcloud-storage-emulator start --port=9090

By default, data is stored under $PWD/.cloudstorage. You can configure the folder using the env variables STORAGE_BASE and STORAGE_DIR.

If you wish to run the emulator in a testing environment or if you don't want to persist any data, you can use the --no-store-on-disk parameter. For tests, you might want to consider starting up the server from your code (see the Python APIs)

If you're using the Google client library (e.g. google-cloud-storage for Python) then you can set the STORAGE_EMULATOR_HOST environment variable to tell the library to connect to your emulator endpoint rather than the standard https://storage.googleapis.com, e.g.:

$ export STORAGE_EMULATOR_HOST=http://localhost:9090

Wiping data

You can wipe the data by running

$ gcloud-storage-emulator wipe

You can pass --keep-buckets to wipe the data while keeping the buckets.

Python APIs

To start a server from your code you can do

from gcloud_storage_emulator.server import create_server

server = create_server("localhost", 9023, in_memory=False)

server.start()
# ........
server.stop()

You can wipe the data (e.g. for text execution) by calling server.wipe()

This can also be achieved (e.g. during tests) by hitting the /wipe endpoint

Running Tests

With Tox

If you have Tox installed then you can run tests with:

tox -e py37 -- {extra_pytest_args}

With Docker

If you don't have Tox installed on your system but you do have Docker, then you can run the tests using the themattrix/tox image:

docker run -v /ABSOLUTE/PATH/TO/THIS/REPO/ON/YOUR/MACHINE:/app themattrix/tox tox -e py37 [optional additional args for tox...]

With unittest

  • Create and activate a virtualenv (optional but recommended)
  • cd into the repository directory
  • pip install -e
  • python -m unittest gcloud_storage_emulator.tests

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