Imports
- github.com/go-kit/kit/tracing/opentracing
- github.com/yiv/yivgame/usercenter/center
- github.com/yiv/yivgame/usercenter/pb
- github.com/go-kit/kit/metrics
- github.com/go-kit/kit/endpoint
- github.com/go-kit/kit/log
- github.com/go-kit/kit/transport/grpc
- github.com/opentracing/opentracing-go
- golang.org/x/net/context