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jsonrpc.py
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jsonrpc.py
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from __future__ import print_function
from collections import namedtuple
from flask import Blueprint, request
from silpa.api import route
import json
import sys
JsonRpcError = namedtuple('JsonRpcError', ['code', 'message', 'data'])
JsonRpcRequest = namedtuple('JsonRpcRequest',
['jsonrpc', 'method', 'params', 'id'])
JsonRpcErrorResponse = namedtuple('JsonRpcErrorResponse',
['jsonrpc', 'error', 'id'])
JsonRpcResultResponse = namedtuple('JsonRpcResultResponse',
['jsonrpc', 'result', 'id'])
PARSE_ERRORS = -32700
INVALID_REQUEST = -32600
METHOD_NOT_FOUND = -32601
INVALID_PARAMS = -32602
INTERNAL_ERROR = -32603
bp = Blueprint('api_jsonrpc', __name__)
@route(bp, '/JSONRPC', methods=['POST'])
def handle_jsonrpc_call():
if request.json is not None:
rpc_object = JsonRpc(request.json)
else:
rpc_object = JsonRpc(request.data)
if rpc_object.error_response is not None:
# There was a error, translate and return the dictionary
# object for client
return dict(zip(rpc_object.error_response._fields,
rpc_object.error_response))
else:
# there was no problem constructing request lets process
# the call
try:
rpc_object()
except Exception as e:
# Possible errors in execution of method
error = JsonRpcError(code=INTERNAL_ERROR, message=e.message,
data=dict(zip(rpc_object.request._fields,
rpc_object.request)))
return dict(jsonrpc="2.0",
error=dict(zip(error._fields, error)),
id=rpc_object.request.id)
else:
if rpc_object.error_response is None:
# success!
return dict(zip(rpc_object.response._fields,
rpc_object.response))
else:
return dict(zip(rpc_object.error_response._fields,
rpc_object.error_response))
class JsonRpc(object):
__slots__ = ['request', 'response', 'error_response', 'instance_type']
def __init__(self, data):
if not isinstance(data, dict):
jsondata = json.loads(data)
else:
jsondata = data
self.error_response = None
try:
self.request = JsonRpcRequest(**jsondata)
except TypeError as e:
error = JsonRpcError(code=INVALID_REQUEST,
message="Not a valid JSON-RPC request",
data=str(e))
error_dict = dict(zip(error._fields, error))
self.error_response = JsonRpcErrorResponse(jsonrpc="2.0",
error=error_dict,
id='')
except Exception as e:
# Unable to parse json
error = JsonRpcError(code=PARSE_ERRORS, message=e.message,
data="")
self.error_response = JsonRpcErrorResponse(jsonrpc="2.0",
error=dict(zip(
error._fields,
error)),
id='')
def __call__(self):
# process request here
module, method = self.request.method.split('.')
if module not in sys.modules:
# Module is not yet loaded or the request module is not
# enabled pass an error here.
error = JsonRpcError(code=INTERNAL_ERROR,
message="Requested module is not loaded or not\
enabled by Admin",
data="{} is not loaded".format(module))
self.error_response = JsonRpcErrorResponse(jsonrpc="2.0",
error=dict(zip(
error._fields,
error)),
id=self.request.id)
else:
# module is present in sys
mod = sys.modules[module]
if hasattr(mod, 'getInstance'):
instance = getattr(mod, 'getInstance')()
if hasattr(instance, method):
result = getattr(instance, method)(*self.request.params)
self.response = JsonRpcResultResponse(jsonrpc="2.0",
result=result,
id=self.request.id)
else:
# method not found
error = JsonRpcError(code=METHOD_NOT_FOUND,
message="requested method not found",
data="Requested method {}".format(
self.request.method))
error_dict = dict(zip(error._fields, error))
self.error_response = JsonRpcErrorResponse(
jsonrpc="2.0",
error=error_dict,
id=self.request.id)
else:
# module doesn't provide an interface to us?
error = JsonRpcError(code=INTERNAL_ERROR,
message="Requested module doesn't provide \
getInstance interface",
data="{} is the module requested".format(
module))
self.error_response = JsonRpcErrorResponse(jsonrpc='2.0',
error=dict(zip(
error._fields,
error)),
id=self.request.id)