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%s\n' % (obj['status'], s))
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
81 def encodeParam(self, param):
82 return osrf.json.to_json(param)
84 class XMLGatewayRequest(GatewayRequest):
86 def __init__(self, service, method, *params):
87 GatewayRequest.__init__(self, service, method, list(params))
92 def getInputFormat(self):
93 return self.getFormat()
95 def handleResponse(self, response):
96 handler = XMLGatewayParser()
97 parser = make_parser()
98 parser.setContentHandler(handler)
100 parser.parse(response)
102 osrf.log.log_error('Error parsing gateway XML: %s' % unicode(e))
105 return handler.getResult()
107 def encodeParam(self, param):
108 return osrf.net_obj.to_xml(param);
110 class XMLGatewayParser(handler.ContentHandler):
116 self.posStack = [] # for tracking array-based hinted object indices
118 # true if we are parsing an element that may have character data
119 self.charsPending = 0
124 def __getAttr(self, attrs, name):
125 for (k, v) in attrs.items():
130 def startElement(self, name, attrs):
132 if self.charsPending:
133 # we just read a 'string' or 'number' element that resulted
134 # in no text data. Appaned a None object
135 self.appendChild(None)
138 self.appendChild(None)
141 if name == 'string' or name == 'number':
142 self.charsPending = True
145 if name == 'element': # this is an object item wrapper
146 self.keyStack.append(self.__getAttr(attrs, 'key'))
149 hint = self.__getAttr(attrs, 'class_hint')
151 obj = new_object_from_hint(hint)
152 self.appendChild(obj)
153 self.objStack.append(obj)
155 self.posStack.append(0)
160 self.appendChild(obj)
161 self.objStack.append(obj)
166 self.appendChild(obj)
167 self.objStack.append(obj)
170 if name == 'boolean':
171 self.appendChild((self.__getAttr(attrs, 'value') == 'true'))
175 def appendChild(self, child):
177 if self.result == None:
180 if not self.objStack: return;
182 parent = self.objStack[len(self.objStack)-1]
184 if isinstance(parent, list):
187 if isinstance(parent, dict):
188 parent[self.keyStack.pop()] = child
190 if isinstance(parent, NetworkObject):
192 if parent.get_registry().protocol == 'array':
193 keys = parent.get_registry().keys
194 i = self.posStack.pop()
197 self.posStack.append(i+1)
199 key = self.keyStack.pop()
201 parent.set_field(key, child)
203 def endElement(self, name):
204 if name == 'array' or name == 'object':
207 def characters(self, chars):
208 self.charsPending = False
209 self.appendChild(urllib.unquote_plus(chars))