etcd、grpc、protobuf兼容性问题

protoc –-go_out&＃61;plugins&＃61;grpc:. *.proto


1. 错误1

报错如下&＃xff1a;

2020/04/26 16:33:39 WARNING: Missing &＃39;go_package&＃39; option in "hello.proto", please specify:option go_package &＃61; ".;protoes";
A future release of protoc-gen-go will require this be specified.
See https://developers.google.com/protocol-buffers/docs/reference/go-generated#package for more information.


这个比较好解决&＃xff0c;按照提示把第 3 行改为第 4 行(注意&＃xff1a;Windows下可能需要将.改为./)&＃xff0c;如下图

2. 错误2

go.mod 目录下执行 go mod tidy
报错如下&＃xff1a;

go: finding github.com/golang/groupcache latest
go: etcdDemo/etcdservice importsgo.etcd.io/etcd/clientv3 tested bygo.etcd.io/etcd/clientv3.test importsgithub.com/coreos/etcd/auth importsgithub.com/coreos/etcd/mvcc/backend importsgithub.com/coreos/bbolt: github.com/coreos/bbolt&＃64;v1.3.4: parsing go.mod:module declares its path as: go.etcd.io/bboltbut was required as: github.com/coreos/bbolt


在 go.mod 中添加两行

replace github.com/coreos/bbolt v1.3.4 &＃61;> go.etcd.io/bbolt v1.3.4
replace go.etcd.io/bbolt v1.3.4 &＃61;> github.com/coreos/bbolt v1.3.4


再次执行 go mod tidy, 再次报错如下&＃xff1a;

go: finding golang.org/x/net latest
go: finding github.com/coreos/go-systemd latest
go: finding github.com/coreos/pkg latest
go: finding golang.org/x/time latest
go: finding github.com/xiang90/probing latest
go: finding github.com/tmc/grpc-websocket-proxy latest
go: finding github.com/golang/groupcache latest
etcdDemo/etcdservice importsgo.etcd.io/etcd/clientv3 importsgithub.com/coreos/etcd/pkg/logutil importsgithub.com/coreos/go-systemd/journal: no matching versions for query "latest"


go 1.13 的版本导致的 &＃xff08;go 1.14 应该没有&＃xff09;
解决方法&＃xff1a;在 go.mod 中添加

replace github.com/coreos/go-systemd &＃61;> github.com/coreos/go-systemd/v22 v22.0.0


再次 go mod tidy , 这一项暂时通过了。

3. 错误3

执行 go build
报错如下&＃xff1a;

D:\code\etcdDemo\server>go build
#github.com/coreos/etcd/clientv3/balancer/resolver/endpoint
E:\gocode\pkg\mod\github.com\coreos\etcd&＃64;v3.3.20&＃43;incompatible\clientv3\balancer\resolver\endpoint\endpoint.go:114:78: undefined: resolver.BuildOption
E:\gocode\pkg\mod\github.com\coreos\etcd&＃64;v3.3.20&＃43;incompatible\clientv3\balancer\resolver\endpoint\endpoint.go:182:31: undefined: resolver.ResolveNowOption
#github.com/coreos/etcd/clientv3/balancer/picker
E:\gocode\pkg\mod\github.com\coreos\etcd&＃64;v3.3.20&＃43;incompatible\clientv3\balancer\picker\err.go:37:44: undefined: balancer.PickOptions
E:\gocode\pkg\mod\github.com\coreos\etcd&＃64;v3.3.20&＃43;incompatible\clientv3\balancer\picker\roundrobin_balanced.go:55:54: undefined: balancer.PickOptions


原因 etcd3.3.20 的 release 版本要求 grpc 的版本是 v1.26.0 之前的。而此时 go.mod 里面的 google.golang.org/grpc 是 v1.29.1
解决方法&＃xff1a;在 go.mod 里添加一句

replace google.golang.org/grpc &＃61;> google.golang.org/grpc v1.26.0


4. 错误4

go build 接着报错&＃xff0c;如下&＃xff1a;

D:\code\etcdDemo\server>go build# etcdDemo/protoes..\protoes\hello.pb.go:292:11: undefined: grpc.SupportPackageIsVersion6
..\protoes\hello.pb.go:303:5: undefined: grpc.ClientConnInterface# etcdDemo/etcdservice..\etcdservice\resolver.go:82:4: invalid case "go.etcd.io/etcd/mvcc/mvccpb".PUT in switch on ev.Type (mismatched types "go.etcd.io/etcd/mvcc/mvccpb".Event_EventType and "github.com/coreos/etcd/mvcc/mvccpb".
Event_EventType)
..\etcdservice\resolver.go:87:4: invalid case "go.etcd.io/etcd/mvcc/mvccpb".DELETE in switch on ev.Type (mismatched types "go.etcd.io/etcd/mvcc/mvccpb".Event_EventType and "github.com/coreos/etcd/mvcc/mvccp
b".Event_EventType)


原因&＃xff1a;此时设备上的 proto-gen-go 是 v1.4.0 版本&＃xff0c;它要求 grpc 的版本是 v1.27.0 往后的&＃xff0c;而刚才 etcd 要求 grpc 是 v.1.26.0 ! 无奈了&＃xff0c;柿子挑软的捏吧&＃xff0c;把 proto-gen-go 降级到能够匹配 grpc v.1.26.0 的版本。执行下面这条命令

go get -u -v github.com/golang/protobuf/protoc-gen-go&＃64;v1.2.0


之后千万别忘了&＃xff0c;重新生成 proto

5. 错误5

继续 go build, 继续报错&＃xff01;&＃xff01;&＃xff01; &＃xff08;心态有点儿崩了。。。&＃xff09;

D:\code\etcdDemo\server>go build
go: finding google.golang.org/genproto latest
go: finding github.com/golang/protobuf v1.3.3# etcdDemo/etcdservice..\etcdservice\resolver.go:82:4: invalid case "go.etcd.io/etcd/mvcc/mvccpb".PUT in switch on ev.Type (mismatched types "go.etcd.io/etcd/mvcc/mvccpb".Event_EventType and "github.com/coreos/etcd/mvcc/mvccpb".
Event_EventType)
..\etcdservice\resolver.go:87:4: invalid case "go.etcd.io/etcd/mvcc/mvccpb".DELETE in switch on ev.Type (mismatched types "go.etcd.io/etcd/mvcc/mvccpb".Event_EventType and "github.com/coreos/etcd/mvcc/mvccp
b".Event_EventType)
..\etcdservice\resolver.go:82:4: invalid case "go.etcd.io/etcd/mvcc/mvccpb".PUT in switch on ev.Type (mismatched types "go.etcd.io/etcd/mvcc/mvccpb".Event_EventTyp
Event_EventType)
..\etcdservice\resolver.go:87:4: invalid case "go.etcd.io/etcd/mvcc/mvccpb".DELETE in switch on ev.Type (mismatched types "go.etcd.io/etcd/mvcc/mvccpb".Event_Event
b".Event_EventType)


缓缓。。。
仔细看了一下报错的内容&＃xff0c;编译器要求 mvccpb 使用 github.com/coreos/etcd/mvcc/mvccpb 这个包&＃xff0c;而代码中使用的是
go.etcd.io/etcd/mvcc/mvccpb 。去对应的代码文件看了一下&＃xff0c;果然是这样。按照要求&＃xff0c;把 github.com/coreos/etcd/mvcc/mvccpb import 进来。
继续 go build, 终于

那一刻&＃xff0c;世界仿佛清静了许多。
对于程序员来说&＃xff0c;最美好的事&＃xff0c;莫过于 no warning, no error

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原文作者&＃xff1a;xiaoma_nmg
转自链接&＃xff1a;https://learnku.com/articles/43758
版权声明&＃xff1a;著作权归作者所有。商业转载请联系作者获得授权&＃xff0c;非商业转载请保留以上作者信息和原文链接。