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Arkindex API Client
===================
**API documentation available at https://arkindex.gitlab.io/api-client/**
``arkindex-client`` provides an API client to interact with Arkindex servers.
Setup
-----
Install the client using ``pip``::
pip install arkindex-client
Usage
-----
To create a client and login using an email/password combo,
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.. code:: python
from arkindex import ArkindexClient
cli = ArkindexClient()
cli.login('EMAIL', 'PASSWORD')
This helper method will save the authentication token in your API client, so
that it is reused in later API requests.
If you already have an API token, you can create your client like so:
.. code:: python
from arkindex import ArkindexClient
cli = ArkindexClient('YOUR_TOKEN')
To perform a simple API request, you can use the ``request()`` method. The method
takes an operation ID as a name and the operation's parameters as keyword arguments:
Making requests
^^^^^^^^^^^^^^^
.. code:: python
corpus = cli.request('RetrieveCorpus', id='...')
The result will be a Python ``dict`` containing the result of the API request.
If the request returns an error, an ``apistar.exceptions.ErrorResponse`` will
be raised.
Dealing with pagination
^^^^^^^^^^^^^^^^^^^^^^^
The Arkindex client adds another helper method for paginated endpoints that
deals with pagination for you: ``ArkindexClient.paginate``. This method
returns a ``ResponsePaginator`` instance, which is a classic Python
iterator that does not perform any actual requests until absolutely needed:
that is, until the next page must be loaded.
.. code:: python
for page in cli.paginate('ListCorpusPages', id=corpus['id']):
print(page['display_name'])
**Warning:** Using ``list`` on a ``ResponsePaginator`` may load dozens
of pages at once and cause a big load on the server. You can use ``len`` to
get the total item count before spamming a server.
Using another server
^^^^^^^^^^^^^^^^^^^^
By default, the API client is set to point to the main Arkindex server at
https://arkindex.teklia.com. If you need or want to use this API client on
another server, you can use the ``base_url`` keyword argument when setting up
your API client:
.. code:: python
cli = ArkindexClient(base_url='https://somewhere')
Handling errors
^^^^^^^^^^^^^^^
APIStar_, the underlying API client we use, does all of the error handling.
It will raise two types of exceptions:
``apistar.exceptions.ErrorResponse``
The request resulted in a HTTP 4xx or 5xx response from the server.
``apistar.exceptions.ClientError``
Any error that prevents the client from making the request or fetching
the response: invalid endpoint names or URLs, unsupported content types,
or unknown request parameters. See the exception messages for more info.
You can handle HTTP errors and fetch more information about them using the
exception's attributes:
.. code:: python
from apistar.exceptions import ErrorResponse
try:
# cli.request ...
except ErrorResponse as e:
print(e.title) # "400 Bad Request"
print(e.status_code) # 400
print(e.result) # Any kind of response body the server might give
Uploading a file
^^^^^^^^^^^^^^^^
The underlying API client we use does not currently handle sending anything
other than JSON; therefore, the client adds a helper method to upload files
to a corpus using the ``UploadDataFile`` endpoint: ``ArkindexClient.upload``.
.. code:: python
# Any readable file-like object is supported
with open('cat.jpg', 'rb') as f:
cli.upload('CORPUS_ID', f)
# You can also use a path directly
cli.upload('CORPUS_ID', 'cat.jpg')
Trying to upload an existing data file will result in a HTTP 400 error that
includes the existing data file's ID, so that you can try to delete it and
upload again or just reuse it.
.. code:: python
from apistar.exceptions import ErrorResponse
try:
data = cli.upload('CORPUS_ID', 'cat.jpg')
file_id = data['id']
print('Success', file_id)
except ErrorResponse as e:
if e.status_code != 400 or 'id' not in e.content:
raise
file_id = e.content['id']
print('Already exists', file_id)
Sending XML content
^^^^^^^^^^^^^^^^^^^
Some Arkindex endpoints expect XML to be sent as the request body; to do so,
use the ``ArkindexClient.send_xml`` method. This method expects a string,
bytestring, or a file-like object as the body. The method works just like
any other request.
.. code:: python
cli.send_xml('SomeEndpoint', body='<xml></xml>')
cli.send_xml('SomeEndpoint', id='...', arg='...', body=b'<xml></xml>')
cli.send_xml('SomeEndpoint', body=open('file.xml'))
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Examples
--------
Print all volumes
^^^^^^^^^^^^^^^^^
.. code:: python
for volume in cli.paginate('ListElements'):
print(volume['name'])
Create transcriptions in bulk
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.. code:: python
payload = {
"parent": "ELEMENT_ID",
"recognizer": "ML_TOOL_SLUG",
"transcriptions": [
{
# A polygon, as a list of at least 3 [x, y] points
"polygon": [
[100, 100],
[100, 300],
[200, 300],
[200, 100],
],
# The confidence score
"score": 0.8,
# Recognized text
"text": "Blah",
# Transcription type: page, paragraph, line, word, character
"type": "word",
},
# ...
]
}
cli.request('CreateTranscriptions', body=payload)
Import transcriptions for a page from files in PAGE XML format
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.. code:: python
cli.send_xml('ImportTranskribusTranscriptions', id='PAGE_ID', body=open('file.xml', 'rb'))
Download full logs for each Ponos task in a workflow
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.. code:: python
workflow = cli.request('RetrieveWorkflow', id='...')
for task in workflow['tasks']:
with open(task['id'] + '.txt', 'w') as f:
f.write(cli.request('RetrieveTaskLog', id=task['id']))