make v3 discovery and etcdctl reuse the same ClientConfig

move the original clientConfig from etcdctl to clientv3. The original
pks/cobrautil is only used by etcdctl or etcdutl, so move it into the
clientv3 package.

client/pkg/go.mod

@@ -4,13 +4,16 @@ go 1.17
 
 require (
 	github.com/coreos/go-systemd/v22 v22.3.2
+	github.com/spf13/cobra v1.2.1
+	github.com/spf13/pflag v1.0.5
 	github.com/stretchr/testify v1.7.0
 	go.uber.org/zap v1.17.0
 	golang.org/x/sys v0.0.0-20210603125802-9665404d3644
 )
 
 require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/inconshreveable/mousetrap v1.0.0 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	go.uber.org/atomic v1.7.0 // indirect
 	go.uber.org/multierr v1.6.0 // indirect

client/v2/go.mod

@@ -11,8 +11,10 @@ require (
 require (
 	github.com/coreos/go-semver v0.3.0 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/kr/pretty v0.1.0 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/stretchr/testify v1.7.0 // indirect
+	gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 // indirect
 	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b // indirect
 )
 

client/v3/config.go

@@ -19,6 +19,9 @@ import (
 	"crypto/tls"
 	"time"
 
+	"go.etcd.io/etcd/client/pkg/v3/cobrautl"
+	"go.etcd.io/etcd/client/pkg/v3/transport"
+
 	"go.uber.org/zap"
 	"google.golang.org/grpc"
 )
@@ -90,3 +93,103 @@ type Config struct {
 
 	// TODO: support custom balancer picker
 }
+
+type ClientConfig struct {
+	Endpoints        []string      `json:"endpoints"`
+	RequestTimeOut   time.Duration `json:"request-timeout"`
+	DialTimeout      time.Duration `json:"dial-timeout"`
+	KeepAliveTime    time.Duration `json:"keepalive-time"`
+	KeepAliveTimeout time.Duration `json:"keepalive-timeout"`
+	Scfg             *SecureCfg    `json:"secure-cfg"`
+	Acfg             *AuthCfg      `json:"auth-cfg"`
+}
+
+type SecureCfg struct {
+	Cert       string `json:"cert"`
+	Key        string `json:"key"`
+	Cacert     string `json:"cacert"`
+	ServerName string `json:"servername"`
+
+	InsecureTransport  bool `json:"insecure-transport"`
+	InsecureSkipVerify bool `json:"insecure-skip-tls-verify"`
+}
+
+type AuthCfg struct {
+	Username string `json:"username"`
+	Password string `json:"password"`
+}
+
+func (cc *ClientConfig) MustClient() *Client {
+	cfg, err := NewClientCfg(cc.Endpoints, cc.DialTimeout, cc.KeepAliveTime, cc.KeepAliveTimeout, cc.Scfg, cc.Acfg)
+	if err != nil {
+		cobrautl.ExitWithError(cobrautl.ExitBadArgs, err)
+	}
+
+	client, err := New(*cfg)
+	if err != nil {
+		cobrautl.ExitWithError(cobrautl.ExitBadConnection, err)
+	}
+
+	return client
+}
+
+func NewClientCfg(endpoints []string, dialTimeout, keepAliveTime, keepAliveTimeout time.Duration, scfg *SecureCfg, acfg *AuthCfg) (*Config, error) {
+	// set tls if any one tls option set
+	var cfgtls *transport.TLSInfo
+	tlsinfo := transport.TLSInfo{}
+	tlsinfo.Logger, _ = zap.NewProduction()
+	if scfg.Cert != "" {
+		tlsinfo.CertFile = scfg.Cert
+		cfgtls = &tlsinfo
+	}
+
+	if scfg.Key != "" {
+		tlsinfo.KeyFile = scfg.Key
+		cfgtls = &tlsinfo
+	}
+
+	if scfg.Cacert != "" {
+		tlsinfo.TrustedCAFile = scfg.Cacert
+		cfgtls = &tlsinfo
+	}
+
+	if scfg.ServerName != "" {
+		tlsinfo.ServerName = scfg.ServerName
+		cfgtls = &tlsinfo
+	}
+
+	cfg := &Config{
+		Endpoints:            endpoints,
+		DialTimeout:          dialTimeout,
+		DialKeepAliveTime:    keepAliveTime,
+		DialKeepAliveTimeout: keepAliveTimeout,
+	}
+
+	if cfgtls != nil {
+		clientTLS, err := cfgtls.ClientConfig()
+		if err != nil {
+			return nil, err
+		}
+		cfg.TLS = clientTLS
+	}
+
+	// if key/cert is not given but user wants secure connection, we
+	// should still setup an empty tls configuration for gRPC to setup
+	// secure connection.
+	if cfg.TLS == nil && !scfg.InsecureTransport {
+		cfg.TLS = &tls.Config{}
+	}
+
+	// If the user wants to skip TLS verification then we should set
+	// the InsecureSkipVerify flag in tls configuration.
+	if scfg.InsecureSkipVerify && cfg.TLS != nil {
+		cfg.TLS.InsecureSkipVerify = true
+	}
+
+	if acfg != nil {
+		cfg.Username = acfg.Username
+		cfg.Password = acfg.Password
+	}
+
+	return cfg, nil
+}

client/v3/go.mod

@@ -21,11 +21,14 @@ require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/gogo/protobuf v1.3.2 // indirect
 	github.com/golang/protobuf v1.5.2 // indirect
+	github.com/inconshreveable/mousetrap v1.0.0 // indirect
 	github.com/matttproud/golang_protobuf_extensions v1.0.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/prometheus/client_model v0.2.0 // indirect
 	github.com/prometheus/common v0.26.0 // indirect
 	github.com/prometheus/procfs v0.6.0 // indirect
+	github.com/spf13/cobra v1.2.1 // indirect
+	github.com/spf13/pflag v1.0.5 // indirect
 	github.com/stretchr/testify v1.7.0 // indirect
 	go.uber.org/atomic v1.7.0 // indirect
 	go.uber.org/multierr v1.6.0 // indirect