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3107
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perry
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#!/usr/bin/python
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#
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# TODO:
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# validate
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# getNextDocid
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# getNextRevision(docid)
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# getDocids(keyword=None)
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# query(keyword, returnfields)
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# queryDict => same as above but returns python dictionary data structure
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import httplib, urllib
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class MetacatClient:
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def __init__(self, server="pmark.msi.ucsb.edu:8180", urlPath="/knb_test/metacat"):
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self.metacatUrlPath = urlPath
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self.metacatServer = server
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self.sessionid = None
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def getMetacatUrl(self):
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return "http://" + self.metacatServer + self.metacatUrlPath
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def login(self, username, password, organization=None):
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if organization == 'NCEAS':
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uid = 'uid=%s,o=NCEAS,dc=ecoinformatics,dc=org' % username
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else:
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uid = username
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postdata = { 'action' : 'login',
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'qformat' : 'xml',
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'username' : uid,
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'password' : password }
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response = self.postRequest(postdata)
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if response.find("<login>") != -1:
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return True
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else:
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return False
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def logout(self):
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postdata = { 'action' : 'logout',
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'qformat' : 'xml'}
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response = self.postRequest(postdata)
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if response.find("<logout>") != -1:
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return True
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else:
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return False
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def read(self, docid, qformat="xml"):
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postdata = { 'action' : 'read',
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'qformat' : qformat,
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'docid' : docid }
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response = self.postRequest(postdata)
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# if error node returned
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if response.find("<error>") != -1:
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return False
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else:
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return response
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def insert(self, docid, doctext):
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postdata = { 'action' : 'insert',
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'doctext' : doctext,
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'docid' : docid }
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response = self.postRequest(postdata)
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# if error node returned
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if response.find("<error>") != -1:
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return False
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else:
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return response
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def update(self, docid, doctext):
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postdata = { 'action' : 'update',
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'doctext' : doctext,
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'docid' : docid }
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response = self.postRequest(postdata)
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return response
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def delete(self, docid):
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postdata = { 'action' : 'delete',
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'docid' : docid }
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response = self.postRequest(postdata)
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return response
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def squery(self, pathquery, qformat="xml"):
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postdata = { 'action' : 'squery',
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'qformat' : qformat,
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'query' : pathquery }
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response = self.postRequest(postdata)
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return response
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def postRequest(self, postdata):
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conn = httplib.HTTPConnection( self.metacatServer )
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params = urllib.urlencode( postdata )
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headers = { "Content-type" : "application/x-www-form-urlencoded",
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"Accept" : "*/*"}
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# If we have an active session, set the cookie
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if self.sessionid is not None:
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headers['Cookie'] = self.sessionid
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conn.request( "POST", self.metacatUrlPath, params, headers )
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response = conn.getresponse()
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# If metacat responds with a new session id,
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# register it with the metacat client instance
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setcookie = response.getheader("set-cookie", None)
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if setcookie:
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jsid = setcookie.split(';')[0]
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if jsid[:11] == "JSESSIONID=":
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self.sessionid = jsid
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if response.status == 200:
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content = response.read()
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else:
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print " !!! SERVER DID NOT RETURN 'OK'.... STATUS is " + str(response.status)
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content = ""
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conn.close()
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return content
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