get/set data from redis for testing redis purely
/sensor: set sensor state to redis
/get: get source data from Google calendar and set it into redis
/ : get data from redis
auto send 'get' request rhythmically
for fun..
- Auto send 'get' request to get data from Google calendar rhythmically
- Save the data into redis
- When consumers call '/', it returns data from redis
- When consumers call '/sensor?para1¶2', it gets data from redis to match the parameter
- Reset the data and put it back into redis