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include docs/conf.py | ||
include docs/make.bat | ||
include docs/Makefile | ||
include LICENSE | ||
include README.rst | ||
recursive-include docs *.rst | ||
recursive-include examples *.py | ||
recursive-include test *.py *.csv |
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Adapters and Wrappers | ||
===================== | ||
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The ``Iota`` class defines the API methods that are available for | ||
interacting with the node, but it delegates the actual interaction to | ||
another set of classes: Adapters and Wrappers. | ||
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AdapterSpec | ||
----------- | ||
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In a few places in the PyOTA codebase, you may see references to a | ||
meta-type called ``AdapterSpec``. | ||
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``AdapterSpec`` is a placeholder that means "URI or adapter instance". | ||
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For example, the first argument of ``Iota.__init__`` is an | ||
``AdapterSpec``. This means that you can initialize an ``Iota`` object | ||
using either a node URI, or an adapter instance: | ||
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- Node URI: ``Iota('http://localhost:14265')`` | ||
- Adapter instance: ``Iota(HttpAdapter('http://localhost:14265'))`` | ||
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Adapters | ||
-------- | ||
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Adapters are responsible for sending requests to the node and returning | ||
the response. | ||
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PyOTA ships with a few adapters: | ||
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HttpAdapter | ||
~~~~~~~~~~~ | ||
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.. code:: python | ||
from iota import Iota | ||
from iota.adapter import HttpAdapter | ||
# Use HTTP: | ||
api = Iota('http://localhost:14265') | ||
api = Iota(HttpAdapter('http://localhost:14265')) | ||
# Use HTTPS: | ||
api = Iota('https://service.iotasupport.com:14265') | ||
api = Iota(HttpAdapter('https://service.iotasupport.com:14265')) | ||
``HttpAdapter`` uses the HTTP protocol to send requests to the node. | ||
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To configure an ``Iota`` instance to use ``HttpAdapter``, specify an | ||
``http://`` or ``https://`` URI, or provide an ``HttpAdapter`` instance. | ||
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The ``HttpAdapter`` raises a ``BadApiResponse`` exception if the server | ||
sends back an error response (due to invalid request parameters, for | ||
example). | ||
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Debugging HTTP Requests | ||
^^^^^^^^^^^^^^^^^^^^^^^ | ||
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.. code:: python | ||
from logging import getLogger | ||
from iota import Iota | ||
api = Iota('http://localhost:14265') | ||
api.adapter.set_logger(getLogger(__name__)) | ||
To see all HTTP requests and responses as they happen, attach a | ||
``logging.Logger`` instance to the adapter via its ``set_logger`` | ||
method. | ||
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Any time the ``HttpAdapter`` sends a request or receives a response, it | ||
will first generate a log message. Note: if the response is an error | ||
response (e.g., due to invalid request parameters), the ``HttpAdapter`` | ||
will log the request before raising ``BadApiResponse``. | ||
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.. note:: | ||
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``HttpAdapter`` generates log messages with ``DEBUG`` level, so make sure that your logger's ``level`` attribute is set low enough that it doesn't filter these messages! | ||
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SandboxAdapter | ||
~~~~~~~~~~~~~~ | ||
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.. code:: python | ||
from iota import Iota | ||
from iota.adapter.sandbox import SandboxAdapter | ||
api =\ | ||
Iota( | ||
SandboxAdapter( | ||
uri = 'https://sandbox.iotatoken.com/api/v1/', | ||
auth_token = 'demo7982-be4a-4afa-830e-7859929d892c', | ||
), | ||
) | ||
The ``SandboxAdapter`` is a specialized ``HttpAdapter`` that sends | ||
authenticated requests to sandbox nodes. | ||
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.. note:: | ||
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See `Sandbox <https://dev.iota.org/sandbox/>`_ Documentation for more information about sandbox nodes. | ||
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Sandbox nodes process certain commands asynchronously. When | ||
``SandboxAdapter`` determines that a request is processed | ||
asynchronously, it will block, then poll the node periodically until it | ||
receives a response. | ||
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The result is that ``SandboxAdapter`` abstracts away the sandbox node's | ||
asynchronous functionality so that your API client behaves exactly the | ||
same as if it were connecting to a non-sandbox node. | ||
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To create a ``SandboxAdapter``, you must provide the URI of the sandbox | ||
node and the auth token that you received from the node maintainer. Note | ||
that ``SandboxAdapter`` only works with ``http://`` and ``https://`` | ||
URIs. | ||
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You may also specify the polling interval (defaults to 15 seconds) and | ||
the number of polls before giving up on an asynchronous job (defaults to | ||
8 times). | ||
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.. note:: | ||
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For parity with the other adapters, ``SandboxAdapter`` blocks until it receives a response from the node. | ||
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If you do not want ``SandboxAdapter`` to block the main thread, it is recommended that you execute it in a separate thread or process. | ||
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MockAdapter | ||
~~~~~~~~~~~ | ||
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.. code:: python | ||
from iota import Iota | ||
from iota.adapter import MockAdapter | ||
# Inject a mock adapter. | ||
api = Iota('mock://') | ||
api = Iota(MockAdapter()) | ||
# Seed responses from the node. | ||
api.adapter.seed_response('getNodeInfo', {'message': 'Hello, world!'}) | ||
api.adapter.seed_response('getNodeInfo', {'message': 'Hello, IOTA!'}) | ||
# Invoke API commands, using the adapter. | ||
print(api.get_node_info()) # {'message': 'Hello, world!'} | ||
print(api.get_node_info()) # {'message': 'Hello, IOTA!'} | ||
print(api.get_node_info()) # raises BadApiResponse exception | ||
``MockAdapter`` is used to simulate the behavior of an adapter without | ||
actually sending any requests to the node. | ||
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This is particularly useful in unit and functional tests where you want | ||
to verify that your code works correctly in specific scenarios, without | ||
having to engineer your own subtangle. | ||
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To configure an ``Iota`` instance to use ``MockAdapter``, specify | ||
``mock://`` as the node URI, or provide a ``MockAdapter`` instance. | ||
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To use ``MockAdapter``, you must first seed the responses that you want | ||
it to return by calling its ``seed_response`` method. | ||
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``seed_response`` takes two parameters: | ||
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- ``command: Text``: The name of the command. Note that this is the | ||
camelCase version of the command name (e.g., ``getNodeInfo``, not | ||
``get_node_info``). | ||
- ``response: dict``: The response that the adapter will return. | ||
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You can seed multiple responses for the same command; the | ||
``MockAdapter`` maintains a queue for each command internally, and it | ||
will pop a response off of the corresponding queue each time it | ||
processes a request. | ||
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Note that you have to call ``seed_response`` once for each request you | ||
expect it to process. If ``MockAdapter`` does not have a seeded response | ||
for a particular command, it will raise a ``BadApiResponse`` exception | ||
(simulates a 404 response). | ||
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Wrappers | ||
-------- | ||
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Wrappers act like decorators for adapters; they are used to enhance or | ||
otherwise modify the behavior of adapters. | ||
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RoutingWrapper | ||
~~~~~~~~~~~~~~ | ||
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.. code:: python | ||
from iota import Iota | ||
from iota.adapter.wrappers import RoutingWrapper | ||
api =\ | ||
Iota( | ||
# Send PoW requests to local node. | ||
# All other requests go to light wallet node. | ||
RoutingWrapper('https://service.iotasupport.com:14265') | ||
.add_route('attachToTangle', 'http://localhost:14265') | ||
.add_route('interruptAttachingToTangle', 'http://localhost:14265') | ||
) | ||
``RoutingWrapper`` allows you to route API requests to different nodes | ||
depending on the command name. | ||
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For example, you could use this wrapper to direct all PoW requests to a | ||
local node, while sending the other requests to a light wallet node. | ||
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``RoutingWrapper`` must be initialized with a default URI/adapter. This | ||
is the adapter that will be used for any command that doesn't have a | ||
route associated with it. | ||
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Once you've initialized the ``RoutingWrapper``, invoke its ``add_route`` | ||
method to specify a different adapter to use for a particular command. | ||
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``add_route`` requires two arguments: | ||
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- ``command: Text``: The name of the command. Note that this is the | ||
camelCase version of the command name (e.g., ``getNodeInfo``, not | ||
``get_node_info``). | ||
- ``adapter: AdapterSpec``: The adapter or URI to send this request to. |
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