Coverage for python/lsst/daf/butler/_butlerConfig.py : 21%

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1# This file is part of daf_butler.
2#
3# Developed for the LSST Data Management System.
4# This product includes software developed by the LSST Project
5# (http://www.lsst.org).
6# See the COPYRIGHT file at the top-level directory of this distribution
7# for details of code ownership.
8#
9# This program is free software: you can redistribute it and/or modify
10# it under the terms of the GNU General Public License as published by
11# the Free Software Foundation, either version 3 of the License, or
12# (at your option) any later version.
13#
14# This program is distributed in the hope that it will be useful,
15# but WITHOUT ANY WARRANTY; without even the implied warranty of
16# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17# GNU General Public License for more details.
18#
19# You should have received a copy of the GNU General Public License
20# along with this program. If not, see <http://www.gnu.org/licenses/>.
22"""
23Configuration classes specific to the Butler
24"""
25from __future__ import annotations
27__all__ = ("ButlerConfig",)
29import copy
30import os.path
31from typing import (
32 Optional
33)
35from .core import (
36 ButlerURI,
37 Config,
38 DatastoreConfig,
39 DimensionConfig,
40 StorageClassConfig,
41)
42from .registry import RegistryConfig
43from .transfers import RepoTransferFormatConfig
45CONFIG_COMPONENT_CLASSES = (RegistryConfig, StorageClassConfig,
46 DatastoreConfig, DimensionConfig,
47 RepoTransferFormatConfig)
50class ButlerConfig(Config):
51 """Contains the configuration for a `Butler`
53 The configuration is read and merged with default configurations for
54 the particular classes. The defaults are read according to the rules
55 outlined in `ConfigSubset`. Each component of the configuration associated
56 with a configuration class reads its own defaults.
58 Parameters
59 ----------
60 other : `str`, `Config`, optional
61 Path to butler configuration YAML file or a directory containing a
62 "butler.yaml" file. If `None` the butler will
63 be configured based entirely on defaults read from the environment
64 or from ``searchPaths``.
65 No defaults will be read if a `ButlerConfig` is supplied directly.
66 searchPaths : `list` or `tuple`, optional
67 Explicit additional paths to search for defaults. They should
68 be supplied in priority order. These paths have higher priority
69 than those read from the environment in
70 `ConfigSubset.defaultSearchPaths()`. They are only read if ``other``
71 refers to a configuration file or directory.
72 """
74 def __init__(self, other=None, searchPaths=None):
76 self.configDir: Optional[ButlerURI] = None
78 # If this is already a ButlerConfig we assume that defaults
79 # have already been loaded.
80 if other is not None and isinstance(other, ButlerConfig):
81 super().__init__(other)
82 # Ensure that the configuration directory propagates
83 self.configDir = copy.copy(other.configDir)
84 return
86 if isinstance(other, str):
87 # This will only allow supported schemes
88 uri = ButlerURI(other)
89 if uri.scheme == "file" or not uri.scheme:
90 # Check explicitly that we have a directory
91 if os.path.isdir(uri.ospath):
92 other = uri.join("butler.yaml")
93 else:
94 # For generic URI assume that we have a directory
95 # if the basename does not have a file extension
96 # This heuristic is needed since we can not rely on
97 # external users to include the trailing / and we
98 # can't always check that the remote resource is a directory.
99 if not uri.dirLike and not uri.getExtension():
100 # Force to a directory and add the default config name
101 uri = ButlerURI(other, forceDirectory=True).join("butler.yaml")
102 other = uri
104 # Create an empty config for us to populate
105 super().__init__()
107 # Read the supplied config so that we can work out which other
108 # defaults to use.
109 butlerConfig = Config(other)
111 configFile = butlerConfig.configFile
112 if configFile is not None:
113 uri = ButlerURI(configFile)
114 self.configDir = uri.dirname()
116 # A Butler config contains defaults defined by each of the component
117 # configuration classes. We ask each of them to apply defaults to
118 # the values we have been supplied by the user.
119 for configClass in CONFIG_COMPONENT_CLASSES:
120 # Only send the parent config if the child
121 # config component is present (otherwise it assumes that the
122 # keys from other components are part of the child)
123 localOverrides = None
124 if configClass.component in butlerConfig:
125 localOverrides = butlerConfig
126 config = configClass(localOverrides, searchPaths=searchPaths)
127 # Re-attach it using the global namespace
128 self.update({configClass.component: config})
129 # Remove the key from the butlerConfig since we have already
130 # merged that information.
131 if configClass.component in butlerConfig:
132 del butlerConfig[configClass.component]
134 # Now that we have all the defaults we can merge the externally
135 # provided config into the defaults.
136 # Not needed if there is never information in a butler config file
137 # not present in component configurations
138 self.update(butlerConfig)