File: //proc/722141/root/lib/python3.6/site-packages/botocore/__pycache__/parsers.cpython-36.pyc
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e�ZG dd� de�ZG dd� de�Z G dd� de �Z G dd� de �Z G dd� de�Z G dd� de�Z G dd� de e �Z!G d d � d e e �Z"G d d � d e �Z#G d d!� d!e�Z$G d"d#� d#e$e �Z%G d$d%� d%e$e �Z&e e e#e%e&d&�Z'dS )'a� Response parsers for the various protocol types.
The module contains classes that can take an HTTP response, and given
an output shape, parse the response into a dict according to the
rules in the output shape.
There are many similarities amongst the different protocols with regard
to response parsing, and the code is structured in a way to avoid
code duplication when possible. The diagram below is a diagram
showing the inheritance hierarchy of the response classes.
::
+--------------+
|ResponseParser|
+--------------+
^ ^ ^
+--------------------+ | +-------------------+
| | |
+----------+----------+ +------+-------+ +-------+------+
|BaseXMLResponseParser| |BaseRestParser| |BaseJSONParser|
+---------------------+ +--------------+ +--------------+
^ ^ ^ ^ ^ ^
| | | | | |
| | | | | |
| ++----------+-+ +-+-----------++ |
| |RestXMLParser| |RestJSONParser| |
+-----+-----+ +-------------+ +--------------+ +----+-----+
|QueryParser| |JSONParser|
+-----------+ +----------+
The diagram above shows that there is a base class, ``ResponseParser`` that
contains logic that is similar amongst all the different protocols (``query``,
``json``, ``rest-json``, ``rest-xml``). Amongst the various services there
is shared logic that can be grouped several ways:
* The ``query`` and ``rest-xml`` both have XML bodies that are parsed in the
same way.
* The ``json`` and ``rest-json`` protocols both have JSON bodies that are
parsed in the same way.
* The ``rest-json`` and ``rest-xml`` protocols have additional attributes
besides body parameters that are parsed the same (headers, query string,
status code).
This is reflected in the class diagram above. The ``BaseXMLResponseParser``
and the BaseJSONParser contain logic for parsing the XML/JSON body,
and the BaseRestParser contains logic for parsing out attributes that
come from other parts of the HTTP response. Classes like the
``RestXMLParser`` inherit from the ``BaseXMLResponseParser`` to get the
XML body parsing logic and the ``BaseRestParser`` to get the HTTP
header/status code/query string parsing.
Additionally, there are event stream parsers that are used by the other parsers
to wrap streaming bodies that represent a stream of events. The
BaseEventStreamParser extends from ResponseParser and defines the logic for
parsing values from the headers and payload of a message from the underlying
binary encoding protocol. Currently, event streams support parsing bodies
encoded as JSON and XML through the following hierarchy.
+--------------+
|ResponseParser|
+--------------+
^ ^ ^
+--------------------+ | +------------------+
| | |
+----------+----------+ +----------+----------+ +-------+------+
|BaseXMLResponseParser| |BaseEventStreamParser| |BaseJSONParser|
+---------------------+ +---------------------+ +--------------+
^ ^ ^ ^
| | | |
| | | |
+-+----------------+-+ +-+-----------------+-+
|EventStreamXMLParser| |EventStreamJSONParser|
+--------------------+ +---------------------+
Return Values
=============
Each call to ``parse()`` returns a dict has this form::
Standard Response
{
"ResponseMetadata": {"RequestId": <requestid>}
<response keys>
}
Error response
{
"ResponseMetadata": {"RequestId": <requestid>}
"Error": {
"Code": <string>,
"Message": <string>,
"Type": <string>,
<additional keys>
}
}
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