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"""
Utility code in speaking the neo4j REST api
"""
import json
import urllib2
def post_neo4j(url, data):
"""
@return dict object from the neo4j json POST response
@raise exception: if the 'errors' key is not empty
"""
ret = post(url, data)
ret_data = json.load(ret)
if ret_data['errors']:
raise Exception('neo4j exception: ' + str(ret_data['errors']))
return ret_data
def post(url, data):
assert(isinstance(data, dict)) # make sure we're not handed json strings
post_data_json = json.dumps(data)
req = urllib2.Request(url)
req.add_header('User-Agent', 'rhizi-server/0.1')
req.add_header('Accept', 'application/json; charset=UTF-8')
req.add_header('Content-Type', 'application/json')
try:
ret = urllib2.urlopen(req, post_data_json)
except urllib2.HTTPError as e:
raise Exception('post request failed: code: {0}, reason: {1}'.format(e.code, e.reason))
return ret
def statement_to_REST_form(query, parameters={}):
"""
turn cypher query to neo4j json API format
"""
assert isinstance(query, basestring)
assert isinstance(parameters, dict)
return {'statement' : query, 'parameters': parameters}
def statement_set_to_REST_form(statement_set):
assert isinstance(statement_set, list)
return {'statements': statement_set}
def where_clause_from_filter_attr_map(filter_attr_map, node_param_name="n"):
"""
convert a filter attribute map to a parameterized Cypher where clause, eg.
in: { 'att_foo': [ 'a', 'b' ], 'att_goo': [1,2] }
out: where n.att_foo in {att_foo} and n.att_goo in {att_goo} ...
@param filter_attr_map: may be None or empty
"""
if not filter_attr_map:
return ""
filter_arr = []
for k in filter_attr_map.keys():
# create a cypher query parameter place holder for each attr set
# eg. n.foo in {foo}, where foo is passed as a query parameter
f_attr = "{0}.{1} in {{{1}}}".format(node_param_name, k)
filter_arr.append(f_attr)
filter_str = "where {0}".format(' and '.join(filter_arr))
return filter_str
def __type_check_link(link):
assert link.has_key('__src')
assert link.has_key('__dst')
def __type_check_filter_attr_map(filter_attr_map):
"""
# type sanity check an attribute filter map
"""
assert isinstance(filter_attr_map, dict)
for k, v in filter_attr_map.items():
assert isinstance(k, basestring)
assert isinstance(v, list)
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