121 lines
4.5 KiB
Python
121 lines
4.5 KiB
Python
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import json
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import warnings
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import os
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from .development.base_component import ComponentRegistry
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from . import exceptions
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class Resources:
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def __init__(self, resource_name):
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self._resources = []
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self.resource_name = resource_name
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def append_resource(self, resource):
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self._resources.append(resource)
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# pylint: disable=too-many-branches
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def _filter_resources(self, all_resources, dev_bundles=False):
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filtered_resources = []
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for s in all_resources:
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filtered_resource = {}
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if "dynamic" in s:
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filtered_resource["dynamic"] = s["dynamic"]
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if "async" in s:
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if "dynamic" in s:
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raise exceptions.ResourceException(
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f"""
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Can't have both 'dynamic' and 'async'.
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{json.dumps(filtered_resource)}
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"""
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)
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# Async assigns a value dynamically to 'dynamic'
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# based on the value of 'async' and config.eager_loading
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#
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# True -> dynamic if the server is not eager, False otherwise
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# 'lazy' -> always dynamic
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# 'eager' -> dynamic if server is not eager
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# (to prevent ever loading it)
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filtered_resource["dynamic"] = (
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not self.config.eager_loading
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if s["async"] is True
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else (s["async"] == "eager" and not self.config.eager_loading)
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or s["async"] == "lazy"
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)
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if "namespace" in s:
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filtered_resource["namespace"] = s["namespace"]
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if "external_url" in s and not self.config.serve_locally:
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filtered_resource["external_url"] = s["external_url"]
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elif "dev_package_path" in s and dev_bundles:
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filtered_resource["relative_package_path"] = s["dev_package_path"]
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elif "relative_package_path" in s:
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filtered_resource["relative_package_path"] = s["relative_package_path"]
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elif "absolute_path" in s:
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filtered_resource["absolute_path"] = s["absolute_path"]
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elif "asset_path" in s:
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info = os.stat(s["filepath"])
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filtered_resource["asset_path"] = s["asset_path"]
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filtered_resource["ts"] = info.st_mtime
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elif self.config.serve_locally:
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warnings.warn(
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(
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"You have set your config to `serve_locally=True` but "
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f"A local version of {s['external_url']} is not available.\n"
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"If you added this file with "
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"`app.scripts.append_script` "
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"or `app.css.append_css`, use `external_scripts` "
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"or `external_stylesheets` instead.\n"
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"See https://dash.plotly.com/external-resources"
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)
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)
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continue
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else:
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raise exceptions.ResourceException(
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f"""
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{json.dumps(filtered_resource)} does not have a
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relative_package_path, absolute_path, or an external_url.
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"""
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)
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filtered_resources.append(filtered_resource)
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return filtered_resources
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def get_all_resources(self, dev_bundles=False):
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lib_resources = ComponentRegistry.get_resources(self.resource_name)
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all_resources = lib_resources + self._resources
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return self._filter_resources(all_resources, dev_bundles)
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# pylint: disable=too-few-public-methods
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class _Config:
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def __init__(self, serve_locally, eager_loading):
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self.eager_loading = eager_loading
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self.serve_locally = serve_locally
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class Css:
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def __init__(self, serve_locally):
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self._resources = Resources("_css_dist")
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self._resources.config = self.config = _Config(serve_locally, True)
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def append_css(self, stylesheet):
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self._resources.append_resource(stylesheet)
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def get_all_css(self):
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return self._resources.get_all_resources()
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class Scripts:
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def __init__(self, serve_locally, eager):
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self._resources = Resources("_js_dist")
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self._resources.config = self.config = _Config(serve_locally, eager)
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def append_script(self, script):
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self._resources.append_resource(script)
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def get_all_scripts(self, dev_bundles=False):
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return self._resources.get_all_resources(dev_bundles)
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