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# author=hochikong
import shelve
class IO(object):
def post(self):
pass
def put(self):
pass
class RawIO(IO):
# The router node record is in a python shelve object (.dat file).
def __init__(self, datafile):
"""Initial member self.file.
:param datafile: a string
"""
self.file = datafile
def post(self, key, data):
"""Create a new record in the shelve object.
:param key: a string
:param data: a python dictionary
:return : a python dictionary
"""
temp = shelve.open(self.file)
temp[key] = data
temp.close()
return {"Result": "Create successfully."}
def put(self, key, data):
"""Update a record or delete a existing record.
:param key: a string
:param data: a python dictionary
:return: different python dictionaries
"""
if data == {"content": "delete"}:
temp = shelve.open(self.file)
try:
del temp[key]
return {"Result": "Delete successfully."}
except KeyError:
return {"Result": "There is no key '%s'." % key}
finally:
temp.close()
else:
self.post(key, data)
return {"Result": "Update successfully."}
def get(self, key="all"):
"""Query a specific record or all records.
:param key: 'none' or a vaild key
:param args: 'all' or 'none'
:return: different python dictionaries
"""
temp = shelve.open(self.file)
if key == "all":
print temp
temp.close()
else:
try:
print temp[key]
except KeyError:
return {"Result": "'There is no key '%s'." % key}
finally:
temp.close()
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