1：下载源码
https://www.cnblogs.com/xingchong/p/16664675.html
1：goland cannot find main module, but found
解决方案：
2.下载所需要的库
git clone https://github.com/name5566/leafserver
go get github.com/name5566/leaf 或者 git clone https://github.com/name5566/leaf /root/leafserver/src/github.com/name5566/leaf
go get github.com/golang/protobuf/proto 或者 git clone https://github.com/golang/protobuf /root/leafserver/src/github.com/golang/protobuf
go get gopkg.in/mgo.v2 或者 git clone https://gopkg.in/mgo.v2 /root/leafserver/src/gopkg.in/mgo.v2
