[BUG] Cannot include Go Micro and gRPC versions above 1.27.0

[pipe01]

Describe the bug

Running go get github.com/micro/go-micro/v2 and go get google.golang.org/grpc on a fresh package without any other packages installed and on a fresh Go installation outputs this:

# github.com/coreos/etcd/clientv3/balancer/resolver/endpoint
/root/go/pkg/mod/github.com/coreos/etcd@v3.3.18+incompatible/clientv3/balancer/resolver/endpoint/endpoint.go:114:78: undefined: resolver.BuildOption
/root/go/pkg/mod/github.com/coreos/etcd@v3.3.18+incompatible/clientv3/balancer/resolver/endpoint/endpoint.go:182:31: undefined: resolver.ResolveNowOption
# github.com/coreos/etcd/clientv3/balancer/picker
/root/go/pkg/mod/github.com/coreos/etcd@v3.3.18+incompatible/clientv3/balancer/picker/err.go:37:44: undefined: balancer.PickOptions
/root/go/pkg/mod/github.com/coreos/etcd@v3.3.18+incompatible/clientv3/balancer/picker/roundrobin_balanced.go:55:54: undefined: balancer.PickOptions

This is related to issue etcd-io/etcd#11563 and countless others, and it's been fixed in version 3.4.8 by etcd-io/etcd#11564 but Go Micro is importing version 3.3.18, which prevents me from using Google's gRPC version 1.30.0 that I need for unrelated reasons.

This could be solved by updating the etcd version this package uses to 3.4.8 or above.

How to reproduce the bug:

$ go mod init test
$ go get google.golang.org/grpc
$ go get github.com/micro/go-micro/v2

Environment:

GO111MODULE="on"
GOARCH="amd64"
GOBIN=""
GOCACHE="/root/.cache/go-build"
GOENV="/root/.config/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/root/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/local/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/linux_amd64"
GCCGO="gccgo"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD="/test/go.mod"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build439350562=/tmp/go-build -gno-record-gcc-switches"

[vtolstov]

for now you can use workaround
replace github.com/coreos/etcd => github.com/ozonru/etcd v3.3.20-grpc1.27-origmodule+incompatible

[pipe01]

Thank you very much, that works as a workaround

[mdere]

Hello - so we ran into this issue on 2.9.1 - Will this be fixed or is this project going to rely on the replace for now?

[vtolstov]

you can ask this in etcd issue, because this is not go-micro problem