Add `go mod` support (#2503)

* Remove vendor and go-dep

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

* Add go.mod

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

* Update Makefile and .travis.yml

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

1 files changed, 0 insertions, 108 deletions

diff --git a/vendor/google.golang.org/grpc/pickfirst.go b/vendor/google.golang.org/grpc/pickfirst.go
deleted file mode 100644
index bf659d49d..000000000
--- a/vendor/google.golang.org/grpc/pickfirst.go
+++ /dev/null
@@ -1,108 +0,0 @@
-/*
- *
- * Copyright 2017 gRPC authors.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *
- */
-
-package grpc
-
-import (
-	"golang.org/x/net/context"
-	"google.golang.org/grpc/balancer"
-	"google.golang.org/grpc/connectivity"
-	"google.golang.org/grpc/grpclog"
-	"google.golang.org/grpc/resolver"
-)
-
-// PickFirstBalancerName is the name of the pick_first balancer.
-const PickFirstBalancerName = "pick_first"
-
-func newPickfirstBuilder() balancer.Builder {
-	return &pickfirstBuilder{}
-}
-
-type pickfirstBuilder struct{}
-
-func (*pickfirstBuilder) Build(cc balancer.ClientConn, opt balancer.BuildOptions) balancer.Balancer {
-	return &pickfirstBalancer{cc: cc}
-}
-
-func (*pickfirstBuilder) Name() string {
-	return PickFirstBalancerName
-}
-
-type pickfirstBalancer struct {
-	cc balancer.ClientConn
-	sc balancer.SubConn
-}
-
-func (b *pickfirstBalancer) HandleResolvedAddrs(addrs []resolver.Address, err error) {
-	if err != nil {
-		grpclog.Infof("pickfirstBalancer: HandleResolvedAddrs called with error %v", err)
-		return
-	}
-	if b.sc == nil {
-		b.sc, err = b.cc.NewSubConn(addrs, balancer.NewSubConnOptions{})
-		if err != nil {
-			grpclog.Errorf("pickfirstBalancer: failed to NewSubConn: %v", err)
-			return
-		}
-		b.cc.UpdateBalancerState(connectivity.Idle, &picker{sc: b.sc})
-		b.sc.Connect()
-	} else {
-		b.sc.UpdateAddresses(addrs)
-		b.sc.Connect()
-	}
-}
-
-func (b *pickfirstBalancer) HandleSubConnStateChange(sc balancer.SubConn, s connectivity.State) {
-	grpclog.Infof("pickfirstBalancer: HandleSubConnStateChange: %p, %v", sc, s)
-	if b.sc != sc {
-		grpclog.Infof("pickfirstBalancer: ignored state change because sc is not recognized")
-		return
-	}
-	if s == connectivity.Shutdown {
-		b.sc = nil
-		return
-	}
-
-	switch s {
-	case connectivity.Ready, connectivity.Idle:
-		b.cc.UpdateBalancerState(s, &picker{sc: sc})
-	case connectivity.Connecting:
-		b.cc.UpdateBalancerState(s, &picker{err: balancer.ErrNoSubConnAvailable})
-	case connectivity.TransientFailure:
-		b.cc.UpdateBalancerState(s, &picker{err: balancer.ErrTransientFailure})
-	}
-}
-
-func (b *pickfirstBalancer) Close() {
-}
-
-type picker struct {
-	err error
-	sc  balancer.SubConn
-}
-
-func (p *picker) Pick(ctx context.Context, opts balancer.PickOptions) (balancer.SubConn, func(balancer.DoneInfo), error) {
-	if p.err != nil {
-		return nil, nil, p.err
-	}
-	return p.sc, nil, nil
-}
-
-func init() {
-	balancer.Register(newPickfirstBuilder())
-}