def handleReadTimed (proxy_id, datestring):
"""
Reads all metadata updated after timestamp and returns them in json format
:param proxy_id:
:param datestring: ISO8601 datestring
:return:
"""
#TODO: handle validation and exceptions
locker = proxy_lock.ProxyLocker (retries=3, wait=5)
try:
timestamp = validate_fields.extractTimestampFromISO8601(datestring)
except:
timestamp = None
meta_dict = {}
for meta_id in buildReadList(proxy_id, timestamp):
meta_dict [meta_id] = locker.performLocked(assembleMetaJson, proxy_id, meta_id)
if timestamp is not None:
returnstamp = None
else:
returnstamp = time.strftime("%Y-%m-%dT%H:%M:%SZ",timestamp)
template = TemplatesModels.model_response_read
customfields = {
"token" : proxy_id,
"time" : returnstamp,
"data": {
"upserts" : meta_dict,
"delete" : []
}
}
responsemsg = createMessageFromTemplate(template, **customfields)
#NOTE that the read happens as a HTTPResponse, so we only return the json for Django to send back, rather than handling the HTTPConnection ourselves
return json.dumps(responsemsg)
def handleReadFull (proxy_id):
"""
Reads everything in the specified proxy and returns it as a json message
:param proxy_id:
:return:
"""
#note: just a modified version of handleReadTimed
#TODO: handle validation and exceptions
locker = proxy_lock.ProxyLocker (retries=3, wait=5)
meta_dict = {}
for meta_id in buildReadList(proxy_id):
#meta_dict [meta_id] = locker.performLocked(assembleMetaJson, proxy_id, meta_id)
try:
meta_dict[meta_id] = locker.performLocked(handleReadMeta, proxy_id, meta_id)
except RuntimeProxyException as ex:
print "Exception encountered: %s" % ex.message
print "Read performed"
template = TemplatesModels.model_response_read_full
customfields = {
"token" : proxy_id,
"data": {
"upserts" : meta_dict,
"delete" : []
}
}
responsemsg = createMessageFromTemplate(template, **customfields)
print "RESULT: %s features " % len(responsemsg)
#NOTE that the read happens as a HTTPResponse, so we only return the json for Django to send back, rather than handling the HTTPConnection ourselves
return json.dumps(responsemsg)
