Source code for bokeh.protocol.messages.patch_doc
from __future__ import absolute_import
from json import loads
from ...core.json_encoder import serialize_json
from ...document.util import references_json
from ..message import Message
from . import register
[docs]@register
class patch_doc_1(Message):
''' Define the ``PATCH-DOC`` message (revision 1) for sending Document
patch events between remote documents.
The ``content`` fragment of for this message is has the form:
.. code-block:: python
{
'events' : <protocol document events>
'references' : <model references>
}
'''
msgtype = 'PATCH-DOC'
revision = 1
def __init__(self, header, metadata, content):
super(patch_doc_1, self).__init__(header, metadata, content)
[docs] @classmethod
def create(cls, events, use_buffers=True, **metadata):
''' Create a ``PATCH-DOC`` message
Args:
events (list) :
A list of patch events to apply to a document
Any additional keyword arguments will be put into the message
``metadata`` fragment as-is.
'''
header = cls.create_header()
if not events:
raise ValueError("PATCH-DOC message requires at least one event")
docs = { event.document for event in events }
if len(docs) != 1:
raise ValueError("PATCH-DOC message configured with events for more than one document")
# this roundtrip is fortunate, but is needed because there are type conversions
# in BokehJSONEncoder which keep us from easily generating non-string JSON
patch_json, buffers = process_document_events(events, use_buffers)
content = loads(patch_json)
msg = cls(header, metadata, content)
for (header, payload) in buffers:
msg.add_buffer(header, payload)
return msg
[docs] def apply_to_document(self, doc, setter=None):
'''
'''
doc.apply_json_patch(self.content, setter)
[docs]def process_document_events(events, use_buffers=True):
''' Create a JSON string describing a patch to be applied as well as
any optional buffers.
Args:
events : list of events to be translated into patches
Returns:
str, list :
JSON string which can be applied to make the given updates to obj
as well as any optional buffers
'''
json_events = []
references = set()
buffers = [] if use_buffers else None
for event in events:
json_events.append(event.generate(references, buffers))
json = {
'events' : json_events,
'references' : references_json(references),
}
return serialize_json(json), buffers if use_buffers else []