Source code for bokeh.resources

#-----------------------------------------------------------------------------
# Copyright (c) 2012 - 2019, Anaconda, Inc., and Bokeh Contributors.
# All rights reserved.
#
# The full license is in the file LICENSE.txt, distributed with this software.
#-----------------------------------------------------------------------------
''' The resources module provides the Resources class for easily configuring
how BokehJS code and CSS resources should be located, loaded, and embedded in
Bokeh documents.

Also provides some pre-configured Resources objects.

Attributes:
    CDN : load minified BokehJS from CDN
    INLINE : provide minified BokehJS from library static directory

'''

#-----------------------------------------------------------------------------
# Boilerplate
#-----------------------------------------------------------------------------
from __future__ import absolute_import, division, print_function, unicode_literals

import logging
log = logging.getLogger(__name__)

#-----------------------------------------------------------------------------
# Imports
#-----------------------------------------------------------------------------

# Standard library imports
import re
import json
from os.path import basename, join, relpath

# External imports
from six import string_types

# Bokeh imports
from . import __version__
from .core.templates import JS_RESOURCES, CSS_RESOURCES
from .model import Model
from .settings import settings

from .util.paths import bokehjsdir
from .util.session_id import generate_session_id

#-----------------------------------------------------------------------------
# Globals and constants
#-----------------------------------------------------------------------------

DEFAULT_SERVER_HOST = "localhost"
DEFAULT_SERVER_PORT = 5006
DEFAULT_SERVER_HTTP_URL = "http://%s:%d/" % (DEFAULT_SERVER_HOST, DEFAULT_SERVER_PORT)

#-----------------------------------------------------------------------------
# General API
#-----------------------------------------------------------------------------

# __all__ defined at the bottom on the class module

#-----------------------------------------------------------------------------
# Dev API
#-----------------------------------------------------------------------------

class BaseResources(object):
    _default_root_dir = "."
    _default_root_url = DEFAULT_SERVER_HTTP_URL

    def __init__(self, mode='inline', version=None, root_dir=None,
                 minified=True, log_level="info", root_url=None,
                 path_versioner=None, components=None):

        self._components = components

        if hasattr(self, '_js_components'):
            self.js_components = self._js_components
        if hasattr(self, '_css_components'):
            self.css_components = self._css_components

        self.mode = settings.resources(mode);           del mode
        self.root_dir = settings.rootdir(root_dir);     del root_dir
        self.version = settings.version(version);       del version
        self.minified = settings.minified(minified);    del minified
        self.log_level = settings.log_level(log_level); del log_level
        self.path_versioner = path_versioner;           del path_versioner

        if root_url and not root_url.endswith("/"):
            log.warning("root_url should end with a /, adding one")
            root_url = root_url + "/"
        self._root_url = root_url
        if self.mode not in ['inline', 'cdn', 'server', 'server-dev', 'relative', 'relative-dev', 'absolute', 'absolute-dev']:
            raise ValueError("wrong value for 'mode' parameter, expected "
                             "'inline', 'cdn', 'server(-dev)', 'relative(-dev)' or 'absolute(-dev)', got %r" % self.mode)

        if self.root_dir and not self.mode.startswith("relative"):
            raise ValueError("setting 'root_dir' makes sense only when 'mode' is set to 'relative'")

        if self.version and not self.mode.startswith('cdn'):
            raise ValueError("setting 'version' makes sense only when 'mode' is set to 'cdn'")

        if root_url and not self.mode.startswith('server'):
            raise ValueError("setting 'root_url' makes sense only when 'mode' is set to 'server'")

        self.dev = self.mode.endswith('-dev')
        if self.dev:
            self.mode = self.mode[:-4]

        self.messages = []

        if self.mode == "cdn":
            cdn = self._cdn_urls()
            self.messages.extend(cdn['messages'])
        elif self.mode == "server":
            server = self._server_urls()
            self.messages.extend(server['messages'])

    # Properties --------------------------------------------------------------

    @property
    def log_level(self):
        return self._log_level

    @log_level.setter
    def log_level(self, level):
        valid_levels = [
            "trace", "debug", "info", "warn", "error", "fatal"
        ]
        if not (level is None or level in valid_levels):
            raise ValueError("Unknown log level '{}', valid levels are: {}".format(level, str(valid_levels)))
        self._log_level = level

    @property
    def root_url(self):
        if self._root_url is not None:
            return self._root_url
        else:
            return self._default_root_url

    # Public methods ----------------------------------------------------------

    def components(self, kind):
        components = self.js_components if kind == 'js' else self.css_components
        if self._components is not None:
            components = [ c for c in components if c in self._components ]
        return components

    def _file_paths(self, kind):
        bokehjs_dir = bokehjsdir(self.dev)
        minified = ".min" if not self.dev and self.minified else ""
        files = [ "%s%s.%s" % (component, minified, kind) for component in self.components(kind) ]
        paths = [ join(bokehjs_dir, kind, file) for file in files ]
        return paths

    def _collect_external_resources(self, resource_attr):
        """ Collect external resources set on resource_attr attribute of all models."""

        external_resources = []

        for _, cls in sorted(Model.model_class_reverse_map.items(), key=lambda arg: arg[0]):
            external = getattr(cls, resource_attr, None)

            if isinstance(external, string_types):
                if external not in external_resources:
                    external_resources.append(external)
            elif isinstance(external, list):
                for e in external:
                    if e not in external_resources:
                        external_resources.append(e)

        return external_resources

    def _cdn_urls(self):
        return _get_cdn_urls(self.version, self.minified)

    def _server_urls(self):
        return _get_server_urls(self.root_url, False if self.dev else self.minified, self.path_versioner)

    def _resolve(self, kind):
        paths = self._file_paths(kind)
        files, raw = [], []

        if self.mode == "inline":
            raw = [ self._inline(path) for path in paths ]
        elif self.mode == "relative":
            root_dir = self.root_dir or self._default_root_dir
            files = [ relpath(path, root_dir) for path in paths ]
        elif self.mode == "absolute":
            files = list(paths)
        elif self.mode == "cdn":
            cdn = self._cdn_urls()
            files = list(cdn['urls'](self.components(kind), kind))
        elif self.mode == "server":
            server = self._server_urls()
            files = list(server['urls'](self.components(kind), kind))

        return (files, raw)

    def _inline(self, path):
        begin = "/* BEGIN %s */" % basename(path)
        with open(path, 'rb') as f:
            middle = f.read().decode("utf-8")
        end = "/* END %s */"  % basename(path)
        return "%s\n%s\n%s" % (begin, middle, end)

[docs]class JSResources(BaseResources): ''' The Resources class encapsulates information relating to loading or embedding Bokeh Javascript. Args: mode (str) : How should Bokeh JS be included in output See below for descriptions of available modes version (str, optional) : what version of Bokeh JS to load Only valid with the ``'cdn'`` mode root_dir (str, optional) : root directory for loading Bokeh JS assets Only valid with ``'relative'`` and ``'relative-dev'`` modes minified (bool, optional) : whether JavaScript should be minified or not (default: True) root_url (str, optional) : URL and port of Bokeh Server to load resources from (default: None) If ``None``, absoute URLs based on the default server configuration will be generated. ``root_url`` can also be the empty string, in which case relative URLs, e.g., "static/css/bokeh.min.js", are generated. Only valid with ``'server'`` and ``'server-dev'`` modes The following **mode** values are available for configuring a Resource object: * ``'inline'`` configure to provide entire Bokeh JS and CSS inline * ``'cdn'`` configure to load Bokeh JS and CSS from ``http://cdn.pydata.org`` * ``'server'`` configure to load from a Bokeh Server * ``'server-dev'`` same as ``server`` but supports non-minified assets * ``'relative'`` configure to load relative to the given directory * ``'relative-dev'`` same as ``relative`` but supports non-minified assets * ``'absolute'`` configure to load from the installed Bokeh library static directory * ``'absolute-dev'`` same as ``absolute`` but supports non-minified assets Once configured, a Resource object exposes the following public attributes: Attributes: css_raw : any raw CSS that needs to be places inside ``<style>`` tags css_files : URLs of any CSS files that need to be loaded by ``<link>`` tags messages : any informational messages concerning this configuration These attributes are often useful as template parameters when embedding Bokeh plots. ''' _js_components = ["bokeh", "bokeh-widgets", "bokeh-tables", "bokeh-gl"] # Properties -------------------------------------------------------------- @property def js_files(self): files, _ = self._resolve('js') external_resources = self._collect_external_resources('__javascript__') return external_resources + files @property def js_raw(self): _, raw = self._resolve('js') if self.log_level is not None: raw.append('Bokeh.set_log_level("%s");' % self.log_level) if self.dev: raw.append('Bokeh.settings.dev = true') return raw # Public methods ---------------------------------------------------------- def render_js(self): return JS_RESOURCES.render(js_raw=self.js_raw, js_files=self.js_files)
[docs]class CSSResources(BaseResources): ''' The CSSResources class encapsulates information relating to loading or embedding Bokeh client-side CSS. Args: mode (str) : how should Bokeh CSS be included in output See below for descriptions of available modes version (str, optional) : what version of Bokeh CSS to load Only valid with the ``'cdn'`` mode root_dir (str, optional) : root directory for loading BokehJS resources Only valid with ``'relative'`` and ``'relative-dev'`` modes minified (bool, optional) : whether CSS should be minified or not (default: True) root_url (str, optional) : URL and port of Bokeh Server to load resources from Only valid with ``'server'`` and ``'server-dev'`` modes The following **mode** values are available for configuring a Resource object: * ``'inline'`` configure to provide entire BokehJS code and CSS inline * ``'cdn'`` configure to load Bokeh CSS from ``http://cdn.pydata.org`` * ``'server'`` configure to load from a Bokeh Server * ``'server-dev'`` same as ``server`` but supports non-minified CSS * ``'relative'`` configure to load relative to the given directory * ``'relative-dev'`` same as ``relative`` but supports non-minified CSS * ``'absolute'`` configure to load from the installed Bokeh library static directory * ``'absolute-dev'`` same as ``absolute`` but supports non-minified CSS Once configured, a Resource object exposes the following public attributes: Attributes: css_raw : any raw CSS that needs to be places inside ``<style>`` tags css_files : URLs of any CSS files that need to be loaded by ``<link>`` tags messages : any informational messages concerning this configuration These attributes are often useful as template parameters when embedding Bokeh plots. ''' _css_components = ["bokeh", "bokeh-widgets", "bokeh-tables"] # Properties -------------------------------------------------------------- @property def css_files(self): files, _ = self._resolve('css') external_resources = self._collect_external_resources("__css__") return external_resources + files @property def css_raw(self): _, raw = self._resolve('css') return raw @property def css_raw_str(self): return [ json.dumps(css) for css in self.css_raw ] # Public methods ---------------------------------------------------------- def render_css(self): return CSS_RESOURCES.render(css_raw=self.css_raw, css_files=self.css_files)
[docs]class Resources(JSResources, CSSResources): ''' The Resources class encapsulates information relating to loading or embedding Bokeh Javascript and CSS. Args: mode (str) : how should Bokeh JS and CSS be included in output See below for descriptions of available modes version (str, optional) : what version of Bokeh JS and CSS to load Only valid with the ``'cdn'`` mode root_dir (str, optional) : root directory for loading Bokeh JS and CSS assets Only valid with ``'relative'`` and ``'relative-dev'`` modes minified (bool, optional) : whether JavaScript and CSS should be minified or not (default: True) root_url (str, optional) : URL and port of Bokeh Server to load resources from Only valid with ``'server'`` and ``'server-dev'`` modes The following **mode** values are available for configuring a Resource object: * ``'inline'`` configure to provide entire Bokeh JS and CSS inline * ``'cdn'`` configure to load Bokeh JS and CSS from ``http://cdn.pydata.org`` * ``'server'`` configure to load from a Bokeh Server * ``'server-dev'`` same as ``server`` but supports non-minified assets * ``'relative'`` configure to load relative to the given directory * ``'relative-dev'`` same as ``relative`` but supports non-minified assets * ``'absolute'`` configure to load from the installed Bokeh library static directory * ``'absolute-dev'`` same as ``absolute`` but supports non-minified assets Once configured, a Resource object exposes the following public attributes: Attributes: js_raw : any raw JS that needs to be placed inside ``<script>`` tags css_raw : any raw CSS that needs to be places inside ``<style>`` tags js_files : URLs of any JS files that need to be loaded by ``<script>`` tags css_files : URLs of any CSS files that need to be loaded by ``<link>`` tags messages : any informational messages concerning this configuration These attributes are often useful as template parameters when embedding Bokeh plots. ''' # Public methods ---------------------------------------------------------- def render(self): return "%s\n%s" % (self.render_css(), self.render_js())
#----------------------------------------------------------------------------- # Private API #----------------------------------------------------------------------------- class _SessionCoordinates(object): """ Internal class used to parse kwargs for server URL, app_path, and session_id.""" def __init__(self, **kwargs): self._url = kwargs.get('url', DEFAULT_SERVER_HTTP_URL) if self._url is None: raise ValueError("url cannot be None") if self._url == 'default': self._url = DEFAULT_SERVER_HTTP_URL if self._url.startswith("ws"): raise ValueError("url should be the http or https URL for the server, not the websocket URL") self._url = self._url.rstrip("/") # we lazy-generate the session_id so we can generate it server-side when appropriate self._session_id = kwargs.get('session_id') # Properties -------------------------------------------------------------- @property def url(self): return self._url @property def session_id(self): """ Session ID derived from the kwargs provided.""" if self._session_id is None: self._session_id = generate_session_id() return self._session_id @property def session_id_allowing_none(self): """ Session ID provided in kwargs, keeping it None if it hasn't been generated yet. The purpose of this is to preserve ``None`` as long as possible... in some cases we may never generate the session ID because we generate it on the server. """ return self._session_id _DEV_PAT = re.compile(r"^(\d)+\.(\d)+\.(\d)+(dev|rc)") def _cdn_base_url(): return "https://cdn.pydata.org" def _get_cdn_urls(version=None, minified=True): if version is None: if settings.docs_cdn(): version = settings.docs_cdn() else: version = __version__.split('-')[0] # check if we want minified js and css _min = ".min" if minified else "" base_url = _cdn_base_url() dev_container = 'bokeh/dev' rel_container = 'bokeh/release' # check the 'dev' fingerprint container = dev_container if _DEV_PAT.match(version) else rel_container if version.endswith(('dev', 'rc')): log.debug("Getting CDN URL for local dev version will not produce usable URL") def mk_url(comp, kind): return '%s/%s/%s-%s%s.%s' % (base_url, container, comp, version, _min, kind) result = { 'urls' : lambda components, kind: [ mk_url(component, kind) for component in components ], 'messages' : [], } if len(__version__.split('-')) > 1: result['messages'].append({ "type" : "warn", "text" : ("Requesting CDN BokehJS version '%s' from Bokeh development version '%s'. " "This configuration is unsupported and may not work!" % (version, __version__)) }) return result def _get_server_urls(root_url, minified=True, path_versioner=None): _min = ".min" if minified else "" def mk_url(comp, kind): path = "%s/%s%s.%s" % (kind, comp, _min, kind) if path_versioner is not None: path = path_versioner(path) return '%sstatic/%s' % (root_url, path) return { 'urls' : lambda components, kind: [ mk_url(component, kind) for component in components ], 'messages' : [], } #----------------------------------------------------------------------------- # Code #----------------------------------------------------------------------------- CDN = Resources(mode="cdn") INLINE = Resources(mode="inline") __all__ = ( 'CDN', 'INLINE', 'Resources', 'JSResources', 'CSSResources', )