kinto-http

Kinto python client ###################

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kinto-http is the Python library to interact with a Kinto server.

There is also a similar client in JavaScript <https://github.com/kinto/kinto-http.js>_.

Installation

Use pip::

$ pip install kinto-http

Usage

Here is an overview of what the API provides:

.. code-block:: python

import kinto_http

client = kinto_http.Client(server_url="http://localhost:8888/v1",
                           auth=('alexis', 'p4ssw0rd'))

records = client.get_records(bucket='default', collection='todos')
for i, record in enumerate(records):
    record['title'] = 'Todo {}'.format(i)
    client.update_record(data=record)

Instantiating a client

The passed auth parameter is a requests <http://docs.python-requests.org>_ authentication policy.

By default, a simple tuple will become a Basic Auth authorization request header, that can authenticate users with Kinto Accounts <https://kinto.readthedocs.io/en/stable/api/1.x/accounts.html>_.

.. code-block:: python

import kinto_http

auth = ('alexis', 'p4ssw0rd')

client = kinto_http.Client(server_url='http://localhost:8888/v1',
                           auth=auth)

It is also possible to pass a bucket ID and/or collection ID to set them as default values for the parameters of the client operations.

.. code-block:: python

client = Client(bucket="payments", collection="receipts", auth=auth)

After creating a client, you can also replicate an existing one and overwrite some key arguments.

.. code-block:: python

client2 = client.clone(collection="orders")

An asynchronous client is also available. It has all the same endpoints as the sync client except for the batch operations.

.. code-block:: python

from kinto_http import AsyncClient

auth = ('alexis', 'p4ssw0rd')

client = AsyncClient(server_url='http://localhost:8888/v1', auth=auth)
info = await client.server_info()
assert 'schema' in info['capabilities'], "Server doesn't support schema validation."

Using a Bearer access token to authenticate (OpenID)

.. code-block:: python

import kinto_http

client = kinto_http.Client(auth=kinto_http.BearerTokenAuth("XYPJTNsFKV2"))

The authorization header is prefixed with Bearer by default. If the header_type is customized on the server <https://kinto.readthedocs.io/en/stable/configuration/settings.html#openid-connect>_, the client must specify the expected type: kinto_http.BearerTokenAuth("XYPJTNsFKV2", type="Bearer+OIDC")

.. note::

Passing a string containing ``Bearer`` will be instantiate a ``kinto_http.BearerTokenAuth()`` object automatically.

In other words, ``kinto_http.Client(auth="Bearer+OIDC XYPJTNsFKV2")`` is equivalent to ``kinto_http.Client(auth=kinto_http.BearerTokenAuth("XYPJTNsFKV2", type="Bearer+OIDC"))``

Using the browser to authenticate via OAuth

.. code-block:: python

import kinto_http

client = kinto_http.Client(server_url='http://localhost:8888/v1', auth=kinto_http.BrowserOAuth())

The client will open a browser page and will catch the Bearer token obtained after the OAuth dance.

Custom headers

Custom headers can be specified in the Client constructor, and will be sent in every request:

.. code-block:: python

import kinto_http

client = kinto_http.Client(server_url="http://server/v1", headers={
    "Allow-Access": "CDN",
    "User-Agent": "blocklist-updater"
})

Getting server information

You can use the server_info() method to fetch the server information:

.. code-block:: python

from kinto_http import Client

client = Client(server_url='http://localhost:8888/v1')
info = client.server_info()
assert 'schema' in info['capabilities'], "Server doesn't support schema validation."

Bucket operations

• get_bucket(id=None, **kwargs): retrieve single bucket
• get_buckets(**kwargs): retrieve all readable buckets
• create_bucket(id=None, data=None, **kwargs): create a bucket
• update_bucket(id=None, data=None, **kwargs): create or replace an existing bucket
• patch_bucket(id=None, changes=None, **kwargs): modify some fields in an existing bucket
• delete_bucket(id=None, **kwargs): delete a bucket and everything under it
• delete_buckets(**kwargs): delete every writable buckets

Groups operations

• get_group(id=None, bucket=None, **kwargs): retrieve single group
• get_groups(bucket=None, **kwargs): retrieve all readable groups
• create_group(id=None, data=None, bucket=None, **kwargs): create a group
• update_group(id=None, data=None, bucket=None, **kwargs): create or replace an existing group
• patch_group(id=None, changes=None, bucket=None, **kwargs): modify some fields in an existing group
• delete_group(id=None, bucket=None, **kwargs): delete a group and everything under it
• delete_groups(bucket=None, **kwargs): delete every writable groups

Collections

• get_collection(id=None, bucket=None, **kwargs): retrieve single collection
• get_collections(bucket=None, **kwargs): retrieve all readable collections
• create_collection(id=None, data=None, bucket=None, **kwargs): create a collection
• update_collection(id=None, data=None, bucket=None, **kwargs): create or replace an existing collection
• patch_collection(id=None, changes=None, bucket=None, **kwargs): modify some fields in an existing collection
• delete_collection(id=None, bucket=None, **kwargs): delete a collection and everything under it
• delete_collections(bucket=None, **kwargs): delete every writable collections

Records

• get_record(id=None, bucket=None, collection=None, **kwargs): retrieve single record
• get_records(bucket=None, collection=None, **kwargs): retrieve all readable records
• get_paginated_records(bucket=None, collection=None, **kwargs): paginated list of records
• get_records_timestamp(bucket=None, collection=None, **kwargs): return the records timestamp of this collection
• create_record(id=None, data=None, bucket=None, collection=None, **kwargs): create a record
• update_record(id=None, data=None, bucket=None, collection=None, **kwargs): create or replace an existing record
• patch_record(id=None, changes=None, bucket=None, collection=None, **kwargs): modify some fields in an existing record
• delete_record(id=None, bucket=None, collection=None, **kwargs): delete a record and everything under it
• delete_records(bucket=None, collection=None, **kwargs): delete every writable records

Permissions

The objects permissions can be specified or modified by passing a permissions to create_*(), patch_*(), or update_*() methods:

.. code-block:: python

client.create_record(data={'foo': 'bar'},
                     permissions={'read': ['group:groupid']})


record = client.get_record('123', collection='todos', bucket='alexis')
record['permissions']['write'].append('leplatrem')
client.update_record(data=record)

In order to obtain a list of all the permissions, on every object, use the get_permissions() method:

.. code-block:: python

all_perms = client.get_permissions(exclude_resource_names=("record",))

has_collection_perms = any(
    p for p in all_perms
    if p["collection_id"] == "my-collection"
    and "write" in p["permissions"]
)

Get or create

In some cases, you might want to create a bucket, collection, group or record only if it doesn't exist already. To do so, you can pass the if_not_exists=True to the create_*() methods::

client.create_bucket(id='blog', if_not_exists=True) client.create_collection(id='articles', bucket='blog', if_not_exists=True)

Delete if exists

In some cases, you might want to delete a bucket, collection, group or record only if it exists already. To do so, you can pass the if_exists=True to the delete_* methods::

client.delete_bucket(id='bucket', if_exists=True)

Patch operations

The .patch_*() operations receive a changes parameter.

.. code-block:: python

from kinto_http.patch_type import BasicPatch, MergePatch, JSONPatch


client.patch_record(id='abc', changes=BasicPatch({'over': 'write'}))

client.patch_record(id='todo', changes=MergePatch({'assignee': 'bob'}))

client.patch_record(id='receipts', changes=JSONPatch([
    {'op': 'add', 'path': '/data/members/0', 'value': 'ldap:[e-mail]'}
]))

Concurrency control

The create_*(), patch_*(), and update_*() methods take a safe argument (default: True).

If True, the client will ensure that the object doesn't exist already for creations, or wasn't modified on the server side since we fetched it. The timestamp will be implicitly read from the last_modified field in the passed data object, or taken explicitly from the if_match parameter.

Batching operations

Rather than issuing a request for each and every operation, it is possible to batch several operations in one request (sync client only).

Using the batch() method as a Python context manager (with):

.. code-block:: python

with client.batch() as batch: for idx in range(0, 100): batch.update_record(data={'id': idx})

.. note::

Besides the ``results()`` method, a batch object shares all the same methods as
another client.

Reading data from batch operations is achieved by using the results() method available after a batch context is closed.

.. code-block:: python

with client.batch() as batch: batch.get_record('r1') batch.get_record('r2') batch.get_record('r3')

r1, r2, r3 = batch.results()

Errors

Failing operations will raise a KintoException, which has request and response attributes.

.. code-block:: python

try:
    client.create_group(id="friends")
except kinto_http.KintoException as e:
    if e.response and e.response.status_code == 403:
        print("Not allowed!")

Requests Timeout

A timeout value in seconds can be specified in the client constructor:

.. code-block:: python

client = KintoClient(server_url="...", timeout=5)

To distinguish the connect from the read timeout, use a tuple:

.. code-block:: python

client = KintoClient(server_url="...", timeout=(3.05, 27))

For an infinit timeout, use None:

.. code-block:: python

client = KintoClient(server_url="...", timeout=None)

See the timeout documentation <https://2.python-requests.org//en/master/user/advanced/#timeouts>_ of the underlying requests library.

Retry on error

When the server is throttled (under heavy load or maintenance) it can return error responses.

The client can hence retry to send the same request until it succeeds. To enable this, specify the number of retries on the client:

.. code-block:: python

client = Client(server_url='http://localhost:8888/v1', auth=credentials, retry=10)

The Kinto protocol lets the server define the duration in seconds between retries <https://kinto.readthedocs.io/en/latest/api/1.x/backoff.html>_. It is possible (but not recommended) to force this value in the clients:

.. code-block:: python

client = Client(server_url='http://localhost:8888/v1', auth=credentials, retry=10, retry_after=5)

Pagination

When the server responses are paginated, the client will download every page and merge them transparently.

The get_paginated_records() method returns a generator that will yield each page:

.. code-block:: python

for page in client.get_paginated_records(): records = page["data"]

It is possible to specify a limit for the number of items to be retrieved in one page:

.. code-block:: python

records = client.get_records(_limit=10)

In order to retrieve every available pages with a limited number of items in each of them, you can specify the number of pages:

.. code-block:: python

records = client.get_records(_limit=10, pages=float('inf'))  # Infinity

History

If the built-in history plugin <https://kinto.readthedocs.io/en/latest/api/1.x/history.html>_ is enabled, it is possible to retrieve the history of changes:

.. code-block:: python

# Get the complete history of a bucket
changes = client.get_history(bucket='default')

# and optionally use filters
hist = client.get_history(bucket='default', _limit=2, _sort='-last_modified', _since='1533762576015')
hist = client.get_history(bucket='default', resource_name='collection')

The history of a bucket can also be purged with:

.. code-block:: python

client.purge_history(bucket='default')

Attachments

If the kinto-attachment plugin <https://github.com/Kinto/kinto-attachment/>_ is enabled, it is possible to add attachments on records:

.. code-block:: python

client.add_attachment(id="record-id", filepath="/path/to/image.png")

Or remove them:

.. code-block:: python

client.remove_attachment(id="record-id")

Endpoint URLs

The get_endpoint() method returns an endpoint URL on the server:

.. code-block:: python

client = Client(server_url='http://localhost:8888/v1',
                auth=('token', 'your-token'),
                bucket="payments",
                collection="receipts")

print(client.get_endpoint("record",
                          id="c6894b2c-1856-11e6-9415-3c970ede22b0"))

# '/buckets/payments/collections/receipts/records/c6894b2c-1856-11e6-9415-3c970ede22b0'

Handling datetime and date objects

In addition to the data types supported by JSON, kinto-http.py also supports native Python date and datetime objects.

In case a payload contain a date or a datetime object, kinto-http.py will encode it as an ISO formatted string.

Please note that this transformation is only one-way. While reading a record, if a string contains a ISO formated string, kinto-http.py will not convert it to a native Python date or datetime object.

If you know that a field will be a datetime, you might consider encoding it yourself to be more explicit about it being a string for Kinto.

Command-line scripts

In order to have common arguments and options for scripts, some utilities are provided to ease configuration and initialization of client from command-line arguments.

.. code-block:: python

import argparse import logging

from kinto_http import cli_utils

logger = logging.getLogger(name)

if name == "main": parser = argparse.ArgumentParser(description="Download records") cli_utils.set_parser_server_options(parser)

  args = parser.parse_args()

  cli_utils.setup_logger(logger, args)

  logger.debug("Instantiate Kinto client.")
  client = cli_utils.create_client_from_args(args)

  logger.info("Fetch records.")
  records = client.get_records()
  logger.warn("{} records.".format(len(records)))

The script now accepts basic options:

::

$ python example.py --help

usage: example.py [-h] [-s SERVER] [-a AUTH] [-b BUCKET] [-c COLLECTION] [-v] [-q] [-D]

Download records

optional arguments: -h, --help show this help message and exit -s SERVER, --server SERVER The location of the remote server (with prefix) -a AUTH, --auth AUTH BasicAuth credentials: token:my-secret or Authorization header: Bearer token -b BUCKET, --bucket BUCKET Bucket name. -c COLLECTION, --collection COLLECTION Collection name. --retry RETRY Number of retries when a request fails --retry-after RETRY_AFTER Delay in seconds between retries when requests fail (default: provided by server) -v, --verbose Show all messages. -q, --quiet Show only critical errors. -D, --debug Show all messages, including debug messages.

Development

See contributing docs <./.github/CONTRIBUTING.md>_