python json-rpc 规范

# request-schema.json
{
    "$schema": "http://json-schema.org/draft-04/schema#",
    "description": "A JSON RPC 2.0 request",
    "oneOf": [
        {
            "description": "An individual request",
            "$ref": "#/definitions/request"
        },
        {
            "description": "An array of requests",
            "type": "array",
            "items": { "$ref": "#/definitions/request" },
            "minItems": 1
        }
    ],
    "definitions": {
        "request": {
            "type": "object",
            "required": [ "jsonrpc", "method" ],
            "properties": {
                "jsonrpc": { "enum": [ "2.0" ] },
                "method": {
                    "type": "string"
                },
                "id": {
                    "type": [ "string", "number", "null" ],
                    "note": [
                        "While allowed, null should be avoided: http://www.jsonrpc.org/specification#id1",
                        "While allowed, a number with a fractional part should be avoided: http://www.jsonrpc.org/specification#id2"
                    ]
                },
                "params": {
                    "type": [ "array", "object" ]
                }
            },
            "additionalProperties": false
        }
    }
}

from jsonrpcclient import request, parse, Ok
import logging
import requests
response = requests.post("http://localhost:5000/", json=request("ping"))
parsed = parse(response.json())
if isinstance(parsed, Ok):
    print(parsed.result)
else:
    logging.error(parsed.message)

# requests.py
def request_pure(
    id_generator: Iterator[Any],
    method: str,
    params: Union[Dict[str, Any], Tuple[Any, ...]],
    id: Any,
) -> Dict[str, Any]:
    return {
        "jsonrpc": "2.0",
        "method": method,
        **(
            {"params": list(params) if isinstance(params, tuple) else params}
            if params
            else {}
        ),
        "id": id if id is not NOID else next(id_generator),
    }
def request_impure(
    id_generator: Iterator[Any],
    method: str,
    params: Union[Dict[str, Any], Tuple[Any, ...], None] = None,
    id: Any = NOID,
) -> Dict[str, Any]:
    return request_pure(
        id_generator or id_generators.decimal(), method, params or (), id
    )
request_natural = partial(request_impure, id_generators.decimal())
...
request = request_natural

$ curl -X POST http://localhost:5001 -d '{"jsonrpc": "2.0", "method": "ping", "params": {}, "id": 1}'

# response.py
class Ok(NamedTuple):
    result: Any
    id: Any
    def __repr__(self) -> str:
        return f"Ok(result={self.result!r}, id={self.id!r})"
class Error(NamedTuple):
    code: int
    message: str
    data: Any
    id: Any
    def __repr__(self) -> str:
        return f"Error(code={self.code!r}, message={self.message!r}, data={self.data!r}, id={self.id!r})"
Response = Union[Ok, Error]

def to_result(response: Dict[str, Any]) -> Response:
    return (
        Ok(response["result"], response["id"])
        if "result" in response
        else Error(
            response["error"]["code"],
            response["error"]["message"],
            response["error"].get("data"),
            response["id"],
        )
    )
def parse(response: Deserialized) -> Union[Response, Iterable[Response]]:
    return (
        map(to_result, response) if isinstance(response, list) else to_result(response)
    )

parse_json = compose(parse, json.loads)

# flask_server.py
from flask import Flask, Response, request
from jsonrpcserver import method, Result, Success, dispatch
app = Flask(__name__)
@method
def ping() -> Result:
    return Success("pong")
@app.route("/", methods=["POST"])
def index():
    return Response(
        dispatch(request.get_data().decode()), content_type="application/json"
    )
if __name__ == "__main__":
    app.run()

# methods.py
Method = Callable[..., Result]
Methods = Dict[str, Method]
global_methods = dict()
def method(
    f: Optional[Method] = None, name: Optional[str] = None
) -> Callable[..., Any]:
    """A decorator to add a function into jsonrpcserver's internal global_methods dict.
    The global_methods dict will be used by default unless a methods argument is passed
    to `dispatch`.
    Functions can be renamed by passing a name argument:
        @method(name=bar)
        def foo():
            ...
    """
    def decorator(func: Method) -> Method:
        nonlocal name
        global_methods[name or func.__name__] = func
        return func
    return decorator(f) if callable(f) else cast(Method, decorator)

# main.py
def dispatch_to_response(
    request: str,
    methods: Optional[Methods] = None,
    *,
    context: Any = NOCONTEXT,
    deserializer: Callable[[str], Deserialized] = json.loads,
    validator: Callable[[Deserialized], Deserialized] = default_validator,
    post_process: Callable[[Response], Any] = identity,
) -> Union[Response, List[Response], None]:
    """Takes a JSON-RPC request string and dispatches it to method(s), giving Response
    namedtuple(s) or None.
    This is a public wrapper around dispatch_to_response_pure, adding globals and
    default values to be nicer for end users.
    Args:
        request: The JSON-RPC request string.
        methods: Dictionary of methods that can be called - mapping of function names to
            functions. If not passed, uses the internal global_methods dict which is
            populated with the @method decorator.
        context: If given, will be passed as the first argument to methods.
        deserializer: Function that deserializes the request string.
        validator: Function that validates the JSON-RPC request. The function should
            raise an exception if the request is invalid. To disable validation, pass
            lambda _: None.
        post_process: Function that will be applied to Responses.
    Returns:
        A Response, list of Responses or None.
    Examples:
       >>> dispatch('{"jsonrpc": "2.0", "method": "ping", "id": 1}')
       '{"jsonrpc": "2.0", "result": "pong", "id": 1}'
    """
    return dispatch_to_response_pure(
        deserializer=deserializer,
        validator=validator,
        post_process=post_process,
        context=context,
        methods=global_methods if methods is None else methods,
        request=request,
    )

def to_serializable_one(response: ResponseType) -> Union[Deserialized, None]:
    return (
        serialize_error(response._error)
        if isinstance(response, Left)
        else serialize_success(response._value)
    )

def dispatch_request(
    methods: Methods, context: Any, request: Request
) -> Tuple[Request, Result]:
    """Get the method, validates the arguments and calls the method.
    Returns: A tuple containing the Result of the method, along with the original
        Request. We need the ids from the original request to remove notifications
        before responding, and  create a Response.
    """
    return (
        request,
        get_method(methods, request.method)
        .bind(partial(validate_args, request, context))
        .bind(partial(call, request, context)),
    )

def call(request: Request, context: Any, method: Method) -> Result:
    """Call the method.
    Handles any exceptions raised in the method, being sure to return an Error response.
    Returns: A Result.
    """
    try:
        result = method(*extract_args(request, context), **extract_kwargs(request))
        # validate_result raises AssertionError if the return value is not a valid
        # Result, which should respond with Internal Error because its a problem in the
        # method.
        validate_result(result)
    # Raising JsonRpcError inside the method is an alternative way of returning an error
    # response.
    except JsonRpcError as exc:
        return Left(ErrorResult(code=exc.code, message=exc.message, data=exc.data))
    # Any other uncaught exception inside method - internal error.
    except Exception as exc:
        logger.exception(exc)
        return Left(InternalErrorResult(str(exc)))
    return result

# response.py
class SuccessResult(NamedTuple):
    result: Any = None
class ErrorResult(NamedTuple):
    code: int
    message: str
    data: Any = NODATA  # The spec says this value may be omitted
# Union of the two valid result types
Result = Either[ErrorResult, SuccessResult]
def Success(*args: Any, **kwargs: Any) -> Either[ErrorResult, SuccessResult]:
    return Right(SuccessResult(*args, **kwargs))
def Error(*args: Any, **kwargs: Any) -> Either[ErrorResult, SuccessResult]:
    return Left(ErrorResult(*args, **kwargs))

start = 0
def gen1():
    start +=1
    return count
# 调用
id = gen1()

def gen2():
    start = 0 
    def incr():
        start +=1
        return count
    return incr
gen = gen2()
# 调用
id = gen()

def hexadecimal(start: int = 1) -> Iterator[str]:
    """
    Incremental hexadecimal numbers.
    e.g. 1, 2, 3, .. 9, a, b, etc.
    Args:
        start: The first value to start with.
    """
    while True:
        yield "%x" % start
        start += 1