jsonschema验证无法解析“孙子”本地文件引用

时间：2018-04-14 20:01:01

标签： python python-3.x jsonschema python-jsonschema

背景： 我有多个json模式引用大型相同的对象。 这些对象被移动到子目录。 在下面的示例中，将显示以下依赖项：

  1. main_schema =＆gt; positive_integer
  2. main_schema =＆gt;日期
  3. date =＆gt; positive_integer
  4. date =＆gt;月

    5. jsonschema库无法仅解析最后一个依赖项，处理所有其他依赖项。

    项目树

    /
+-- code.py
+-- schemas /
|   +-- dependencies /
|   |   +-- date.json
|   |   +-- month.json
|   |   +-- positive_integer.json
|   +-- main_schema.json

    code.py：

    来自jsonschema import validate     导入json 

    contact = \
{
    "name": "William Johns",
    "age": 25,
    "birthDate": { "month": "apr", "day": 15 }
}

def main():
    schema = json.load(open("schemas/main_schema.json"))
    validate(contact, schema)

if (__name__ == '__main__'):
    main()

    JSON架构

    main_schema json 

    {
    "title": "MainSchema",

    "properties":
    {
        "name":      { "type": "string" },
        "age":       { "$ref": "file:schemas/dependencies/positive_integer.json" },
        "birthDate": { "$ref": "file:schemas/dependencies/date.json" }
    },
    "additionalProperties": false
}

    date.json 

    {
    "title": "date",
    "type": "object",

    "properties":
    {
        "month": { "$ref": "file:month.json" },
        "day":   { "$ref": "file:positive_integer.json" }
    },
    "additionalProperties": false
}

    month.json：

    {
    "title": "month",
    "type": "string",
    "enum": [ "jan", "feb", "mar", "apr" ]
}

    positive_integer.json：

    {
    "title": "positiveInteger",
    "type": "integer",
    "minimum": 1
}

    问题

    当我运行它时，程序会因堆栈跟踪而失败：

    "C:\Program Files (x86)\Python\3.6.0\python.exe" D:/Code/python/test/json_schema_testing/validator.py
Traceback (most recent call last):
  File "C:\Program Files (x86)\Python\3.6.0\lib\site-packages\jsonschema\validators.py", line 380, in resolve_from_url
    document = self.store[url]
  File "C:\Program Files (x86)\Python\3.6.0\lib\site-packages\jsonschema\_utils.py", line 23, in __getitem__
    return self.store[self.normalize(uri)]
KeyError: 'file:///schemas/dependencies/month.json'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Program Files (x86)\Python\3.6.0\lib\urllib\request.py", line 1474, in open_local_file
    stats = os.stat(localfile)
FileNotFoundError: [WinError 3] Системе не удается найти указанный путь: '\\schemas\\dependencies\\month.json'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Program Files (x86)\Python\3.6.0\lib\site-packages\jsonschema\validators.py", line 383, in resolve_from_url
    document = self.resolve_remote(url)
  File "C:\Program Files (x86)\Python\3.6.0\lib\site-packages\jsonschema\validators.py", line 474, in resolve_remote
    result = json.loads(urlopen(uri).read().decode("utf-8"))
  File "C:\Program Files (x86)\Python\3.6.0\lib\urllib\request.py", line 223, in urlopen
    return opener.open(url, data, timeout)
  File "C:\Program Files (x86)\Python\3.6.0\lib\urllib\request.py", line 526, in open
    response = self._open(req, data)
  File "C:\Program Files (x86)\Python\3.6.0\lib\urllib\request.py", line 544, in _open
    '_open', req)
  File "C:\Program Files (x86)\Python\3.6.0\lib\urllib\request.py", line 504, in _call_chain
    result = func(*args)
  File "C:\Program Files (x86)\Python\3.6.0\lib\urllib\request.py", line 1452, in file_open
    return self.open_local_file(req)
  File "C:\Program Files (x86)\Python\3.6.0\lib\urllib\request.py", line 1492, in open_local_file
    raise URLError(exp)
urllib.error.URLError: <urlopen error [WinError 3] Системе не удается найти указанный путь: '\\schemas\\dependencies\\month.json'>

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "D:/Code/python/test/json_schema_testing/validator.py", line 16, in <module>
    main()
  File "D:/Code/python/test/json_schema_testing/validator.py", line 13, in main
    validate(contact, schema)
  File "C:\Program Files (x86)\Python\3.6.0\lib\site-packages\jsonschema\validators.py", line 541, in validate
    cls(schema, *args, **kwargs).validate(instance)
  File "C:\Program Files (x86)\Python\3.6.0\lib\site-packages\jsonschema\validators.py", line 129, in validate
    for error in self.iter_errors(*args, **kwargs):
  File "C:\Program Files (x86)\Python\3.6.0\lib\site-packages\jsonschema\validators.py", line 105, in iter_errors
    for error in errors:
  File "C:\Program Files (x86)\Python\3.6.0\lib\site-packages\jsonschema\_validators.py", line 304, in properties_draft4
    schema_path=property,
  File "C:\Program Files (x86)\Python\3.6.0\lib\site-packages\jsonschema\validators.py", line 121, in descend
    for error in self.iter_errors(instance, schema):
  File "C:\Program Files (x86)\Python\3.6.0\lib\site-packages\jsonschema\validators.py", line 105, in iter_errors
    for error in errors:
  File "C:\Program Files (x86)\Python\3.6.0\lib\site-packages\jsonschema\_validators.py", line 216, in ref
    for error in validator.descend(instance, resolved):
  File "C:\Program Files (x86)\Python\3.6.0\lib\site-packages\jsonschema\validators.py", line 121, in descend
    for error in self.iter_errors(instance, schema):
  File "C:\Program Files (x86)\Python\3.6.0\lib\site-packages\jsonschema\validators.py", line 105, in iter_errors
    for error in errors:
  File "C:\Program Files (x86)\Python\3.6.0\lib\site-packages\jsonschema\_validators.py", line 304, in properties_draft4
    schema_path=property,
  File "C:\Program Files (x86)\Python\3.6.0\lib\site-packages\jsonschema\validators.py", line 121, in descend
    for error in self.iter_errors(instance, schema):
  File "C:\Program Files (x86)\Python\3.6.0\lib\site-packages\jsonschema\validators.py", line 105, in iter_errors
    for error in errors:
  File "C:\Program Files (x86)\Python\3.6.0\lib\site-packages\jsonschema\_validators.py", line 212, in ref
    scope, resolved = validator.resolver.resolve(ref)
  File "C:\Program Files (x86)\Python\3.6.0\lib\site-packages\jsonschema\validators.py", line 375, in resolve
    return url, self._remote_cache(url)
  File "C:\Program Files (x86)\Python\3.6.0\lib\site-packages\jsonschema\validators.py", line 385, in resolve_from_url
    raise RefResolutionError(exc)
jsonschema.exceptions.RefResolutionError: <urlopen error [WinError 3] Системе не удается найти указанный путь: '\\schemas\\dependencies\\month.json'>
(eng: System could not find such file: ...)

Process finished with exit code 1

    正如我调查的那样，“孙子”依赖关系只有在之前预先加载时才能解析。 因此，如果删除“date =＆gt; month”依赖关系，或强制从preol级别“预加载”它，一切都会正常工作。

    解决方法

    将main_schema.json修改为：

    {
    "title": "MainSchema",

    "not":
    {
        "comment": "This is preload of 'grandchild' dependencies. It is required due to the jsonschema lib issues.",
        "anyOf":
        [
            { "$ref": "file:schemas/dependencies/month.json" },
            { "$ref": "file:schemas/dependencies/date.json" },
            { "$ref": "file:schemas/dependencies/positive_integer.json" }
        ]
    },


    "properties":
    {
        "name":      { "type": "string" },
        "age":       { "$ref": "file:schemas/dependencies/positive_integer.json" },
        "birthDate": { "$ref": "file:schemas/dependencies/date.json" }
    },
    "additionalProperties": false
}

    如果这样做，验证将会成功。 但是，我真的不喜欢这种解决方法。 如果您有任何想法如何解决，请告诉我。

    系统信息：

    • Windows 7
    • Python 3.6.0
    • jsonschema 2.6.0

0 个答案:

没有答案
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