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import sys

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import gluon.contrib.simplejson as simplejson

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class JSONRPCServiceBase(object):

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    def __init__(self):

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        self.methods = {}

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    def response(self, id, result):

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        return simplejson.dumps({'version': '1.1', 'id': id,

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                                 'result': result, 'error': None})

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    def error(self, id, code, message):

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        return simplejson.dumps({

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            'id': id,

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            'version': '1.1',

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            'error': {'name': 'JSONRPCError',

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                      'code': code,

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                      'message': message}

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        })

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    def add_method(self, name, method):

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        self.methods[name] = method

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    def process(self, data):

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        data = simplejson.loads(data)

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        id, method, params = data["id"], data["method"], data["params"]

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        if method in self.methods:

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            try:

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                result = self.methods[method](*params)

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                return self.response(id, result)

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            except BaseException:

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                etype, eval, _etb = sys.exc_info()

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                return self.error(id, 100, '%s: %s' % (etype.__name__, eval))

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        else:

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            return self.error(id, 100, 'method "%s" does not exist' % method)

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    def listmethods(self):

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        return self.methods.keys()