b2blaze
Welcome to the b2blaze library for Python.
Backblaze B2 provides the cheapest cloud object storage and transfer available on the internet. Comparatively, AWS S3 is 320% more expensive to store and 400% more expensive to transfer to the internet.
This library will allow you to easily interact with B2 buckets and files as first class objects in Python 2 and 3. It is licensed under the MIT license so feel free to use it anywhere! If you enjoy it, please feel free to contribute or request features.
Installation
To install b2blaze, run the following command in the proper environment:
pip install b2blaze
Setup
You will need a key_id and an application_key to run b2blaze. You can obtain these in the B2 portal. Then, either pass them into B2() or set the environment variables B2_KEY_ID and B2_APPLICATION_KEY.
Example Usage
b2blaze is built around OOP principles and as such all buckets and files are objects which you can interact with. Let’s see an example where we list all of our files in a bucket:
from b2blaze import B2
b2 = B2()
bucket = b2.buckets.get('test_bucket')
files = bucket.files.all()
Files will be a list of B2File objects with all of their properties which can then be downloaded by running:
content = files[0].download()
This is a BytesIO object that you can manipulate in any way include saving locally or serving on a website.
Guide
The B2 Object
from b2blaze import B2
b2 = B2()
The B2 object is how you access b2blaze’s functionality. You can optionally pass in “key_id” and “application_key” as named arguments but you should probably set them as environment variable as described above.
Buckets
Buckets are essentially the highest level folders in B2, similar to how buckets are used in AWS S3.
Bucket Properties
bucket_id
bucket_name
bucket_type
bucket_info
lifecycle_rules
revision
cors_rules
deleted
List All Buckets
buckets = b2.buckets.all()
Create a Bucket
bucket = b2.buckets.create('test_bucket', security=b2.buckets.public)
Buckets can either be public or private. This does not change the functionality of the library other than that you will need to manually authorize when using file URLs (see below).
Retrieve a bucket
bucket_by_name = b2.buckets.get('test_bucket')
bucket_by_id = b2.buckets.get(bucket_id='abcd')
Delete a bucket
bucket.delete()
This will delete both the bucket and all files within it. There is no confirmation. Use carefully.
Files
Files are the same files you store locally. They can be stored inside folders placed in buckets but this means they simply have a name like “folder/test.txt”. There is no distinction between folders and files.
File Properties
file_id
file_name
content_sha1
content_length
content_type
file_info
action
uploadTimestamp
deleted
List All Files in a Bucket
bucket.files.all()
NOTE: There may be tens of thousands of files (or more) in a bucket. This operation will get information and create objects for all of them. It may take quite some time and be computationally expensive to run.
Upload a File
text_file = open('hello.txt', 'rb')
new_file = bucket.files.upload(contents=text_file, file_name='folder/hello.txt')
NOTE: You don’t have to call .read() and instead can send the file directly to contents. This will allow the file buffer directly over HTTP to B2 and save a significant amount of memory. Also, contents must be binary or a binary stream.
Upload a Large File
large_file = open('large_file.bin', 'rb')
new_file = bucket.files.upload_large_file(contents=large_file, file_name='folder/large_file.bin', num_threads=4)
NOTE: You cannot call .read() on the file because the function will seek and buffer the file over num_threads for you. Per Backblaze recommendation, part_size defaults to recommendedPartSize from b2_authorize_account (typically 100MB). num_threads defaults to 4 threads. The minimum part size is 5MB and you must have must have at least 2 parts.
Retrieve a File’s Information (Necessary before Downloading)
file_by_name = bucket.files.get(file_name='folder/hello.txt')
file_by_id = bucket.files.get(file_id='abcd1234')
Download a file
file = bucket.files.get(file_name='folder/hello.txt')
downloaded_file = file.download()
This returns a BytesIO object which you can manipulate in Python using a tool like PIL, serve on a website, or easily save like this:
save_file = open('save_pic.jpg', 'wb')
save_file.write(downloaded_file.read())
save_file.close()
Delete a file version
file.delete()
This deletes a single version of a file. (See the docs on File Versions at Backblaze for explanation)
Hide (aka “Soft-delete”) a file
file.hide()
This hides a file (aka “soft-delete”) so that downloading by name will not find the file, but previous versions of the file are still stored. (See the docs on Hiding file at Backblaze for details)
Testing
Unit testing with pytest Before running, you must set the environment variables: B2_KEY_ID and B2_APPLICATION_KEY
** Run tests **
python3 ./tests.py
LICENSE
MIT License
Copyright (c) 2018 George Sibble
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
