add grpc-go code

Signed-off-by: Miek Gieben <miek@miek.nl>

go.mod

@@ -16,9 +16,11 @@ require (
 	github.com/coreos/go-systemd v0.0.0-20190212144455-93d5ec2c7f76 // indirect
 	github.com/coreos/pkg v0.0.0-20180928190104-399ea9e2e55f // indirect
 	github.com/dnstap/golang-dnstap v0.0.0-20170829151710-2cf77a2b5e11
+	github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473
 	github.com/farsightsec/golang-framestream v0.0.0-20181102145529-8a0cb8ba8710
 	github.com/golang/groupcache v0.0.0-20190129154638-5b532d6fd5ef // indirect
 	github.com/golang/protobuf v1.3.2
+	github.com/google/go-cmp v0.3.1
 	github.com/googleapis/gnostic v0.2.0 // indirect
 	github.com/grpc-ecosystem/grpc-opentracing v0.0.0-20180507213350-8e809c8a8645
 	github.com/imdario/mergo v0.3.7 // indirect

go.sum

@@ -124,7 +124,9 @@ github.com/eapache/queue v1.1.0 h1:YOEu7KNc61ntiQlcEeUIoDTJ2o8mQznoNvUhiigpIqc=
 github.com/eapache/queue v1.1.0/go.mod h1:6eCeP0CKFpHLu8blIFXhExK/dRa7WDZfr6jVFPTqq+I=
 github.com/elazarl/goproxy v0.0.0-20170405201442-c4fc26588b6e/go.mod h1:/Zj4wYkgs4iZTTu3o/KG3Itv/qCCa8VVMlb3i9OVuzc=
 github.com/emicklei/go-restful v0.0.0-20170410110728-ff4f55a20633/go.mod h1:otzb+WCGbkyDHkqmQmT5YD2WR4BBwUdeQoFo8l/7tVs=
+github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473 h1:4cmBvAEBNJaGARUEs3/suWRyfyBfhf7I60WBZq+bv2w=
 github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
+github.com/envoyproxy/protoc-gen-validate v0.1.0 h1:EQciDnbrYxy13PgWoY8AqoxGiPrpgBZ1R8UNe3ddc+A=
 github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
 github.com/evanphx/json-patch v4.2.0+incompatible h1:fUDGZCv/7iAN7u0puUVhvKCcsR6vRfwrJatElLBEf0I=
 github.com/evanphx/json-patch v4.2.0+incompatible/go.mod h1:50XU6AFN0ol/bzJsmQLiYLvXMP4fmwYFNcr97nuDLSk=

plugin/traffic/traffic.go

@@ -6,6 +6,7 @@ import (
 	"sync"
 	"time"
 
+	clog "github.com/coredns/coredns/pkg/log"
 	"github.com/coredns/coredns/plugin"
 	"github.com/coredns/coredns/plugin/pkg/response"
 	"github.com/coredns/coredns/request"
@@ -13,6 +14,8 @@ import (
 	"github.com/miekg/dns"
 )
 
+var log = clog.NewWithPlugin("traffic")
+
 // Traffic is a plugin that load balances according to assignments.
 type Traffic struct {
 	assignments map[string]assignment // zone -> assignment

plugin/traffic/xds/log.go

+package xds
+
+import (
+	clog "github.com/coredns/coredns/plugin/pkg/log"
+)
+
+var log = clog.NewWithPlugin("traffic")