p2pool/util/jsonrpc.py

   1 from __future__ import division
   2
   3 import json
   4
   5 from twisted.internet import defer
   6 from twisted.python import log
   7 from twisted.web import client, error
   8
   9 import deferred_resource
  10
  11 class Error(Exception):
  12     def __init__(self, code, message, data=None):
  13         if not isinstance(code, int):
  14             raise TypeError('code must be an int')
  15         #if not isinstance(message, unicode):
  16         #    raise TypeError('message must be a unicode')
  17         self.code, self.message, self.data = code, message, data
  18     def __str__(self):
  19         return '%i %s' % (self.code, self.message) + (' %r' % (self.data, ) if self.data is not None else '')
  20     def _to_obj(self):
  21         return {
  22             'code': self.code,
  23             'message': self.message,
  24             'data': self.data,
  25         }
  26
  27 class Proxy(object):
  28     def __init__(self, url, headers={}, timeout=5):
  29         self._url = url
  30         self._headers = headers
  31         self._timeout = timeout
  32
  33     @defer.inlineCallbacks
  34     def callRemote(self, method, *params):
  35         id_ = 0
  36
  37         try:
  38             data = yield client.getPage(
  39                 url=self._url,
  40                 method='POST',
  41                 headers=dict(self._headers, **{'Content-Type': 'application/json'}),
  42                 postdata=json.dumps({
  43                     'jsonrpc': '2.0',
  44                     'method': method,
  45                     'params': params,
  46                     'id': id_,
  47                 }),
  48                 timeout=self._timeout,
  49             )
  50         except error.Error, e:
  51             try:
  52                 resp = json.loads(e.response)
  53             except:
  54                 raise e
  55         else:
  56             resp = json.loads(data)
  57
  58         if resp['id'] != id_:
  59             raise ValueError('invalid id')
  60         if 'error' in resp and resp['error'] is not None:
  61             raise Error(**resp['error'])
  62         defer.returnValue(resp['result'])
  63
  64     def __getattr__(self, attr):
  65         if attr.startswith('rpc_'):
  66             return lambda *params: self.callRemote(attr[len('rpc_'):], *params)
  67         raise AttributeError('%r object has no attribute %r' % (self.__class__.__name__, attr))
  68
  69 class Server(deferred_resource.DeferredResource):
  70     def __init__(self, provider):
  71         deferred_resource.DeferredResource.__init__(self)
  72         self._provider = provider
  73
  74     @defer.inlineCallbacks
  75     def render_POST(self, request):
  76         id_ = None
  77
  78         try:
  79             try:
  80                 data = request.content.read()
  81
  82                 try:
  83                     req = json.loads(data)
  84                 except Exception:
  85                     raise Error(-32700, u'Parse error')
  86
  87                 id_ = req.get('id', None)
  88                 method = req.get('method', None)
  89                 if not isinstance(method, basestring):
  90                     raise Error(-32600, u'Invalid Request')
  91                 params = req.get('params', [])
  92                 if not isinstance(params, list):
  93                     raise Error(-32600, u'Invalid Request')
  94
  95                 method_meth = getattr(self._provider, 'rpc_' + method, None)
  96                 if method_meth is None:
  97                     raise Error(-32601, u'Method not found')
  98
  99                 result = yield method_meth(request, *params)
 100                 error = None
 101             except Error:
 102                 raise
 103             except Exception:
 104                 log.err(None, 'Squelched JSON error:')
 105                 raise Error(-32099, u'Unknown error')
 106         except Error, e:
 107             result = None
 108             error = e._to_obj()
 109
 110         data = json.dumps(dict(
 111             jsonrpc='2.0',
 112             id=id_,
 113             result=result,
 114             error=error,
 115         ))
 116         request.setHeader('Content-Type', 'application/json')
 117         request.setHeader('Content-Length', len(data))
 118         request.write(data)