[ WIP ] support async

[codecov-io]

Codecov Report

Merging #26 into master will decrease coverage by 35.44%. The diff coverage is 23.92%.

@@             Coverage Diff             @@
##           master      #26       +/-   ##
===========================================
- Coverage   86.75%   51.31%   -35.45%     
===========================================
  Files          35       35               
  Lines        1714     1713        -1     
===========================================
- Hits         1487      879      -608     
- Misses        227      834      +607

Impacted Files	Coverage Δ
lib/store/local_memory.js	100% <ø> (ø)	:arrow_up:
lib/consumer/mq_push_consumer.js	7.5% <0%> (-76.4%)	:arrow_down:
lib/store/local_file.js	70.58% <100%> (-5.89%)	:arrow_down:
lib/channel.js	34.14% <100%> (-65.86%)	:arrow_down:
lib/store/remote_broker.js	7.14% <11.11%> (-88.58%)	:arrow_down:
lib/mq_client_api.js	22.77% <33.33%> (-44.06%)	:arrow_down:
lib/mq_client.js	49.48% <48.48%> (-34.71%)	:arrow_down:
lib/producer/mq_producer.js	28.31% <50%> (-56.03%)	:arrow_down:
lib/remoting_client.js	87.09% <75%> (-8.07%)	:arrow_down:
... and 13 more

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[denghongcai]

@ngot I submit a new pr #31 , close this?

[ngot]

@denghongcai definitely