139 lines
4.2 KiB
Python
139 lines
4.2 KiB
Python
"""Functions that help us generate and use info.json files.
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"""
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import json
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import hjson
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import jsonschema
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from collections.abc import Mapping
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from functools import lru_cache
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from typing import OrderedDict
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from pathlib import Path
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from milc import cli
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def _dict_raise_on_duplicates(ordered_pairs):
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"""Reject duplicate keys."""
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d = {}
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for k, v in ordered_pairs:
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if k in d:
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raise ValueError("duplicate key: %r" % (k,))
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else:
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d[k] = v
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return d
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def json_load(json_file, strict=True):
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"""Load a json file from disk.
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Note: file must be a Path object.
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"""
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try:
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# Get the IO Stream for Path objects
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# Not necessary if the data is provided via stdin
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if isinstance(json_file, Path):
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json_file = json_file.open(encoding='utf-8')
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return hjson.load(json_file, object_pairs_hook=_dict_raise_on_duplicates if strict else None)
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except (json.decoder.JSONDecodeError, hjson.HjsonDecodeError) as e:
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cli.log.error('Invalid JSON encountered attempting to load {fg_cyan}%s{fg_reset}:\n\t{fg_red}%s', json_file, e)
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exit(1)
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except Exception as e:
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cli.log.error('Unknown error attempting to load {fg_cyan}%s{fg_reset}:\n\t{fg_red}%s', json_file, e)
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exit(1)
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@lru_cache(maxsize=0)
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def load_jsonschema(schema_name):
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"""Read a jsonschema file from disk.
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"""
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if Path(schema_name).exists():
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return json_load(schema_name)
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schema_path = Path(f'data/schemas/{schema_name}.jsonschema')
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if not schema_path.exists():
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schema_path = Path('data/schemas/false.jsonschema')
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return json_load(schema_path)
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@lru_cache(maxsize=0)
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def compile_schema_store():
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"""Compile all our schemas into a schema store.
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"""
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schema_store = {}
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for schema_file in Path('data/schemas').glob('*.jsonschema'):
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schema_data = load_jsonschema(schema_file)
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if not isinstance(schema_data, dict):
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cli.log.debug('Skipping schema file %s', schema_file)
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continue
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schema_store[schema_data['$id']] = schema_data
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return schema_store
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@lru_cache(maxsize=0)
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def create_validator(schema):
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"""Creates a validator for the given schema id.
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"""
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schema_store = compile_schema_store()
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resolver = jsonschema.RefResolver.from_schema(schema_store[schema], store=schema_store)
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return jsonschema.Draft202012Validator(schema_store[schema], resolver=resolver).validate
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def validate(data, schema):
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"""Validates data against a schema.
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"""
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validator = create_validator(schema)
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return validator(data)
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def deep_update(origdict, newdict):
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"""Update a dictionary in place, recursing to do a depth-first deep copy.
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"""
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for key, value in newdict.items():
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if isinstance(value, Mapping):
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origdict[key] = deep_update(origdict.get(key, {}), value)
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else:
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origdict[key] = value
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return origdict
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def merge_ordered_dicts(dicts):
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"""Merges nested OrderedDict objects resulting from reading a hjson file.
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Later input dicts overrides earlier dicts for plain values.
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If any value is "!delete!", the existing value will be removed from its parent.
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Arrays will be appended. If the first entry of an array is "!reset!", the contents of the array will be cleared and replaced with RHS.
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Dictionaries will be recursively merged. If any entry is "!reset!", the contents of the dictionary will be cleared and replaced with RHS.
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"""
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result = OrderedDict()
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def add_entry(target, k, v):
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if k in target and isinstance(v, (OrderedDict, dict)):
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if "!reset!" in v:
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target[k] = v
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else:
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target[k] = merge_ordered_dicts([target[k], v])
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if "!reset!" in target[k]:
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del target[k]["!reset!"]
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elif k in target and isinstance(v, list):
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if v[0] == '!reset!':
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target[k] = v[1:]
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else:
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target[k] = target[k] + v
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elif v == "!delete!" and isinstance(target, (OrderedDict, dict)):
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del target[k]
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else:
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target[k] = v
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for d in dicts:
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for (k, v) in d.items():
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add_entry(result, k, v)
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return result
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