1 from xml.dom import minidom
2 from xml.sax import handler, make_parser, saxutils
3 from osrf.json import to_object
4 from osrf.net_obj import NetworkObject, new_object_from_hint
6 import urllib, urllib2, sys, re
11 def __init__(self, service, method, params=[]):
12 self.service = service
16 self.bytes_read = 0 # for now this, this is really characters read
18 def setPath(self, path):
22 params = self.buildPOSTParams()
23 request = urllib2.Request(self.buildURL(), data=params)
26 response =urllib2.urlopen(request)
27 except urllib2.HTTPError, e:
29 sys.stderr.write('%s => %s?%s\n' % (unicode(e), self.buildURL(), params))
32 return self.handleResponse(response)
34 def buildPOSTParams(self):
36 params = urllib.urlencode({
37 'service': self.service,
38 'method': self.method,
39 'format': self.getFormat(),
40 'input_format': self.getInputFormat()
44 params += '¶m=%s' % urllib.quote(self.encodeParam(p), "'/")
47 def setDefaultHost(host):
50 setDefaultHost = staticmethod(setDefaultHost)
53 return 'http://%s/%s' % (defaultHost, self.path)
55 class JSONGatewayRequest(GatewayRequest):
56 def __init__(self, service, method, *params):
57 GatewayRequest.__init__(self, service, method, list(params))
62 def getInputFormat(self):
63 return self.getFormat()
65 def handleResponse(self, response):
67 data = response.read()
68 self.bytes_read = len(str(response.headers)) + len(data)
71 if obj['status'] != 200:
72 sys.stderr.write('JSON gateway returned status %d:\n' % (obj['status']))
75 # the gateway wraps responses in an array to handle streaming data
76 # if there is only one item in the array, it (probably) wasn't a streaming request
78 if len(p) > 1: return p
79 if len(p): return p[0]
82 def encodeParam(self, param):
83 return osrf.json.to_json(param)
85 class XMLGatewayRequest(GatewayRequest):
87 def __init__(self, service, method, *params):
88 GatewayRequest.__init__(self, service, method, list(params))
93 def getInputFormat(self):
94 return self.getFormat()
96 def handleResponse(self, response):
97 handler = XMLGatewayParser()
98 parser = make_parser()
99 parser.setContentHandler(handler)
101 parser.parse(response)
103 osrf.log.log_error('Error parsing gateway XML: %s' % unicode(e))
106 return handler.getResult()
108 def encodeParam(self, param):
109 return osrf.net_obj.to_xml(param);
111 class XMLGatewayParser(handler.ContentHandler):
117 self.posStack = [] # for tracking array-based hinted object indices
119 # true if we are parsing an element that may have character data
120 self.charsPending = 0
125 def __getAttr(self, attrs, name):
126 for (k, v) in attrs.items():
131 def startElement(self, name, attrs):
133 if self.charsPending:
134 # we just read a 'string' or 'number' element that resulted
135 # in no text data. Appaned a None object
136 self.appendChild(None)
139 self.appendChild(None)
142 if name == 'string' or name == 'number':
143 self.charsPending = True
146 if name == 'element': # this is an object item wrapper
147 self.keyStack.append(self.__getAttr(attrs, 'key'))
150 hint = self.__getAttr(attrs, 'class_hint')
152 obj = new_object_from_hint(hint)
153 self.appendChild(obj)
154 self.objStack.append(obj)
156 self.posStack.append(0)
161 self.appendChild(obj)
162 self.objStack.append(obj)
167 self.appendChild(obj)
168 self.objStack.append(obj)
171 if name == 'boolean':
172 self.appendChild((self.__getAttr(attrs, 'value') == 'true'))
176 def appendChild(self, child):
178 if self.result == None:
181 if not self.objStack: return;
183 parent = self.objStack[len(self.objStack)-1]
185 if isinstance(parent, list):
188 if isinstance(parent, dict):
189 parent[self.keyStack.pop()] = child
191 if isinstance(parent, NetworkObject):
193 if parent.get_registry().protocol == 'array':
194 keys = parent.get_registry().keys
195 i = self.posStack.pop()
198 self.posStack.append(i+1)
200 key = self.keyStack.pop()
202 parent.set_field(key, child)
204 def endElement(self, name):
205 if name == 'array' or name == 'object':
208 def characters(self, chars):
209 self.charsPending = False
210 self.appendChild(urllib.unquote_plus(chars))