diff --git a/Makefile b/Makefile
index 46eb89d..aedc5b8 100644
--- a/Makefile
+++ b/Makefile
@@ -44,3 +44,25 @@ openapi:
 		--openapiv2_out ./gen/openapi2 \
 		--openapiv2_opt logtostderr=true \
 		/protos/echo/v1/echo.proto
+
+certs:
+	openssl genrsa -out ca.key 2048
+	openssl req -new -x509 -days 3650 \
+		-subj "/C=GB/L=China/O=gobook/CN=github.com" \
+		-key ca.key -out ca.crt
+	openssl req -new \
+		-subj "/C=GB/L=China/O=server/CN=server.io" \
+		-key server.key \
+		-out server.csr
+	openssl x509 -req -sha256 \
+		-CA ca.crt -CAkey ca.key -CAcreateserial -days 3650 \
+		-in server.csr \
+		-out server.crt
+	openssl req -new \
+		-subj "/C=GB/L=China/O=client/CN=client.io" \
+		-key client.key \
+		-out client.csr
+	openssl x509 -req -sha256 \
+		-CA ca.crt -CAkey ca.key -CAcreateserial -days 3650 \
+		-in client.csr \
+		-out client.crt
\ No newline at end of file
diff --git a/cert/Makefile b/cert/Makefile
new file mode 100644
index 0000000..b1c19f4
--- /dev/null
+++ b/cert/Makefile
@@ -0,0 +1,38 @@
+ca:
+	openssl genrsa -out ca.key 2048
+	openssl req -new -x509 -days 3650 \
+		-subj "/C=GB/L=China/O=gd/CN=ca.com" \
+		-key ca.key -out ca.pem
+
+server:
+	openssl genrsa -out server.key 2048
+	openssl req -new \
+		-subj "/C=GB/L=China/O=server/CN=server.grpc.io" \
+		-key server.key \
+		-out server.csr
+	openssl x509 -req -sha256 \
+		-CA ca.pem -CAkey ca.key -CAcreateserial -days 3650 \
+		-extfile server-ext.cnf \
+		-in server.csr \
+		-out server.pem
+
+client:
+	openssl genrsa -out client.key 2048
+	openssl req -new \
+		-subj "/C=GB/L=China/O=client/CN=client.grpc.io" \
+		-key client.key \
+		-out client.csr
+	openssl x509 -req -sha256 \
+		-CA ca.pem -CAkey ca.key -CAcreateserial -days 3650 \
+		-extfile client-ext.cnf \
+		-in client.csr \
+		-out client.pem
+
+vca:
+	openssl x509 -text -noout -in ca.pem
+
+vsrv:
+	openssl x509 -text -noout -in server.pem
+
+vcli:
+	openssl x509 -text -noout -in client.pem
\ No newline at end of file
diff --git a/cert/ca.crt b/cert/ca.crt
new file mode 100644
index 0000000..ed639c0
--- /dev/null
+++ b/cert/ca.crt
@@ -0,0 +1,18 @@
+-----BEGIN CERTIFICATE-----
+MIIC8jCCAdoCCQCbJvTNVPI+kjANBgkqhkiG9w0BAQsFADA7MQswCQYDVQQGEwJH
+QjEOMAwGA1UEBwwFQ2hpbmExCzAJBgNVBAoMAmdkMQ8wDQYDVQQDDAZjYS5jb20w
+HhcNMjEwMTE2MjExNTUzWhcNMzEwMTE0MjExNTUzWjA7MQswCQYDVQQGEwJHQjEO
+MAwGA1UEBwwFQ2hpbmExCzAJBgNVBAoMAmdkMQ8wDQYDVQQDDAZjYS5jb20wggEi
+MA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQC0aVz7T1FpqnMLBZR07pcYgmok
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+AAEwDQYJKoZIhvcNAQELBQADggEBAIDEsRZMRiW7xPZa3iRTeGS7ZJdTO2Fgtc/v
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+tQ6dzstLLhSFnus3aPEr4kvZpgMFltnGzmQkg4cYBIq3jLdXINRjy3hGx6kRsQzD
+fbiST8PlXaZvzkNx/2BQfISAfXCL62Ur4925CHZ1F8kticHAjAo9AH59pzdScALi
+GWq2GpcMT/Ve6cUPFqZY+OiDM0HfUgcOrRw0rdgITL0ceIZdQbDX/kgGCR/RH1sW
+vFz3Am9wWr3iv1LUqekLZAQ/rDu4JsCSy77Yl942Olo97sXoaig=
+-----END CERTIFICATE-----
diff --git a/cert/ca.key b/cert/ca.key
new file mode 100644
index 0000000..58c1eb4
--- /dev/null
+++ b/cert/ca.key
@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----
+MIIEpAIBAAKCAQEAuwZy9/z+xmUKfpFiakMvkeWZcEt8rctV3LYo1sg0bBPOPfu7
+lhBS+NJrwvblP3vod+VUptoN2YEj5EJVwwsXR0P6JrQUNdoitBLqmKgmMls0UZGQ
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++hqJMqY+Tsy1K9wSFkoxEAEfZ/WvHPgFtDQ3sQIDAQABAoIBAQCjge/hfv3+1Tdn
+kBNKc5KTKvgKhPRrvOlEHL13iXDLTEVzSzGk8ICZqN0thkzGQ73plEV92gVhstV+
+KcBw1LF1TKjWTXmd2yeb5y3SaK98NuB2r5ya6eVk4jCXPUFJ9RdCr3fHsLLHfPxr
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+qAmWqpQL41215iz12DOq8UfYWyHR3/jnywBpl9UC4a0AM093kVPSLLNa44UlqTuE
+H+kk99DnQu5rWam17RHRmXSSRTXmn8w3shEqjvQ5zHW0+NEYfoezEm4GtCQhpk2j
+dgaXNw1u8PNLd83jTl4TLVECgYBD9sZ8gcaw0cMBL0G3MaX45G/jXpHpxtndIRrB
+eivNKi7zEHEkVvJQT/rQlg6qQrNks4xOQkEp9ad6X1zuM/JnlZVnZmdTH3X5BgGH
+irRrh4LqrjN5WFWVa9/XF5tCifxONOtwqtsgXmC0CpzZ8AAYnwNC/N+tApgUv0Cb
+12c/6QKBgQCO6hiEkpfMAcWE91B06kRdBwEbrOHaGKuYMYI4PAQD9SEW0GVH3YnO
+rbcByes0eHutm3A7NfqsQ/MgFQWfQxGeXNVFeC56APq4Nh0MH0XLrV8hgDy78VyJ
+OZNZiIdi94jclgiNykrVBvT5fXt1ykTSBaCpuIiwqoDbKRvXJDVilw==
+-----END RSA PRIVATE KEY-----
diff --git a/cert/ca.pem b/cert/ca.pem
new file mode 100644
index 0000000..e1024d8
--- /dev/null
+++ b/cert/ca.pem
@@ -0,0 +1,18 @@
+-----BEGIN CERTIFICATE-----
+MIIC8jCCAdoCCQC+Ot06xy+vnjANBgkqhkiG9w0BAQsFADA7MQswCQYDVQQGEwJH
+QjEOMAwGA1UEBwwFQ2hpbmExCzAJBgNVBAoMAmdkMQ8wDQYDVQQDDAZjYS5jb20w
+HhcNMjEwMTE2MjEyMzU1WhcNMzEwMTE0MjEyMzU1WjA7MQswCQYDVQQGEwJHQjEO
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+/zG5jrhnxGRHch0gU2AFpCFdHCL1M0BvRXcdK7rLuQQ2DTKnJJL+jLszAj4wf4mX
+Wxa7W7iVPc6fMsjFs3KLw6EHf4XTdazL3pRC+O0odwtY5PEu85aww9SfEiiXoSVi
+cdmtFkgIdUXEqJl3HtzoYTz/NAEFiTVYO7/NH1ZcB4KrucCIL4Q=
+-----END CERTIFICATE-----
diff --git a/cert/ca.srl b/cert/ca.srl
new file mode 100644
index 0000000..2ad4f2c
--- /dev/null
+++ b/cert/ca.srl
@@ -0,0 +1 @@
+C04A9C1432903DF5
diff --git a/cert/client-ext.cnf b/cert/client-ext.cnf
new file mode 100644
index 0000000..93ec6c4
--- /dev/null
+++ b/cert/client-ext.cnf
@@ -0,0 +1 @@
+subjectAltName=DNS:*.grpc.io,IP:0.0.0.0
diff --git a/cert/client.crt b/cert/client.crt
new file mode 100644
index 0000000..ae44235
--- /dev/null
+++ b/cert/client.crt
@@ -0,0 +1,19 @@
+-----BEGIN CERTIFICATE-----
+MIIDIzCCAgugAwIBAgIJAMBKnBQykD3yMA0GCSqGSIb3DQEBCwUAMDsxCzAJBgNV
+BAYTAkdCMQ4wDAYDVQQHDAVDaGluYTELMAkGA1UECgwCZ2QxDzANBgNVBAMMBmNh
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+EK6astzNoiD2u2aC3fCa2+qVzheacInPBzknzuexfyvm3/AkoK+x
+-----END CERTIFICATE-----
diff --git a/cert/client.csr b/cert/client.csr
new file mode 100644
index 0000000..84a67ef
--- /dev/null
+++ b/cert/client.csr
@@ -0,0 +1,16 @@
+-----BEGIN CERTIFICATE REQUEST-----
+MIICjDCCAXQCAQAwRzELMAkGA1UEBhMCR0IxDjAMBgNVBAcMBUNoaW5hMQ8wDQYD
+VQQKDAZjbGllbnQxFzAVBgNVBAMMDmNsaWVudC5ncnBjLmlvMIIBIjANBgkqhkiG
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+OLy/n+t5lP8qRSJ0gZ4FH4ECMNaBehUYEC9ZKuxMAwI=
+-----END CERTIFICATE REQUEST-----
diff --git a/cert/client.key b/cert/client.key
new file mode 100644
index 0000000..1410018
--- /dev/null
+++ b/cert/client.key
@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----
+MIIEpAIBAAKCAQEAyC5xWEIR+TOX7XbcZvE+UIV8XIfb5FHDGm/XT00usZakg5Ci
+4u0lztHj4IeiS8nUEcFpIFIkfHFIKBxpECj523KTXqyn6/GnlKyaIM85diXN1d9u
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+FKrPIH52rDsv6zTsqSYvGZU8AyZG2gjCQU8io9xxyAPAFIdjEhtyFQ==
+-----END RSA PRIVATE KEY-----
diff --git a/cert/client.pem b/cert/client.pem
new file mode 100644
index 0000000..0701005
--- /dev/null
+++ b/cert/client.pem
@@ -0,0 +1,19 @@
+-----BEGIN CERTIFICATE-----
+MIIDIzCCAgugAwIBAgIJAMBKnBQykD31MA0GCSqGSIb3DQEBCwUAMDsxCzAJBgNV
+BAYTAkdCMQ4wDAYDVQQHDAVDaGluYTELMAkGA1UECgwCZ2QxDzANBgNVBAMMBmNh
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+AAAAMA0GCSqGSIb3DQEBCwUAA4IBAQAzRhGKpOpwIX/GQl5vTkJrhoReqpy25t38
+zxT8q9fDdzzEwT7Q2IC1heGl6khBzFpPjrxlzqlG+xF5Ke2TgiC7fOEwM2UHOXk+
+RcXkAkUAymi9SfaJozFh6YBsnbjoS4946TUEdEPXYi9lm3tvsoCNCvhv9mLJoQrn
+mUarZ/StXMh7+LFr1H8kKhBOFlWbyxL4X/+SfLxFY6up+PWxhzh93bohNDnrzoo3
+Zk5YkFNvJPqrVBlonkifb3o6AugOVCsD4xiC6S6jepJYjbBaPCv1+DbLQMIM6D7M
+hVmvWMxOSrVIiFTChYRb2bzXmEft5iR2Gd5dUYXazDh0EN5kV7GO
+-----END CERTIFICATE-----
diff --git a/cert/server-ext.cnf b/cert/server-ext.cnf
new file mode 100644
index 0000000..185795e
--- /dev/null
+++ b/cert/server-ext.cnf
@@ -0,0 +1 @@
+subjectAltName=DNS:*.grpc.io,DNS:*.grpc.org,DNS:localhost,IP:0.0.0.0
diff --git a/cert/server.crt b/cert/server.crt
new file mode 100644
index 0000000..7d9fc05
--- /dev/null
+++ b/cert/server.crt
@@ -0,0 +1,20 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
diff --git a/cert/server.csr b/cert/server.csr
new file mode 100644
index 0000000..eb2ed16
--- /dev/null
+++ b/cert/server.csr
@@ -0,0 +1,16 @@
+-----BEGIN CERTIFICATE REQUEST-----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+-----END CERTIFICATE REQUEST-----
diff --git a/cert/server.key b/cert/server.key
new file mode 100644
index 0000000..f76cb47
--- /dev/null
+++ b/cert/server.key
@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----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+-----END RSA PRIVATE KEY-----
diff --git a/cert/server.pem b/cert/server.pem
new file mode 100644
index 0000000..f3866d9
--- /dev/null
+++ b/cert/server.pem
@@ -0,0 +1,20 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
diff --git a/cmd/client/main.go b/cmd/client/main.go
new file mode 100644
index 0000000..87d9f89
--- /dev/null
+++ b/cmd/client/main.go
@@ -0,0 +1,55 @@
+package main
+
+import (
+	"context"
+	"crypto/tls"
+	"crypto/x509"
+	"io/ioutil"
+
+	log "github.com/sirupsen/logrus"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/credentials"
+
+	pb "github.com/esinio/geco/gen/proto/echo/v1"
+)
+
+var addr = ":9090"
+
+func main() {
+	cert, err := tls.LoadX509KeyPair("./cert/client.pem", "./cert/client.key")
+	if err != nil {
+		log.Fatalf("tls.LoadX509KeyPair err: %v", err)
+	}
+
+	certPool := x509.NewCertPool()
+	ca, err := ioutil.ReadFile("./cert/ca.pem")
+	if err != nil {
+		log.Fatalf("ioutil.ReadFile err: %v", err)
+	}
+
+	if ok := certPool.AppendCertsFromPEM(ca); !ok {
+		log.Fatalf("certPool.AppendCertsFromPEM err")
+	}
+
+	c := credentials.NewTLS(&tls.Config{
+		Certificates: []tls.Certificate{cert},
+		ServerName:   "example.grpc.io",
+		RootCAs:      certPool,
+	})
+
+	conn, err := grpc.Dial(addr, grpc.WithTransportCredentials(c))
+	if err != nil {
+		log.Fatalf("grpc.Dial err: %v", err)
+	}
+	defer conn.Close()
+
+	client := pb.NewEchoServiceClient(conn)
+	resp, err := client.Echo(context.Background(), &pb.StringMessage{
+		Value: "gRPC TLS example",
+	})
+	if err != nil {
+		log.Fatalf("client err: %v", err)
+	}
+
+	log.Printf("resp: %#v", resp)
+}
diff --git a/cmd/server/main.go b/cmd/server/main.go
index 2f3ce83..1db61b7 100644
--- a/cmd/server/main.go
+++ b/cmd/server/main.go
@@ -2,16 +2,41 @@
 package main
 
 import (
+	"crypto/tls"
+	"crypto/x509"
+	"io/ioutil"
 	"net"
 
+	log "github.com/sirupsen/logrus"
 	"google.golang.org/grpc"
+	"google.golang.org/grpc/credentials"
 
 	pb "github.com/esinio/geco/gen/proto/echo/v1"
 	srv "github.com/esinio/geco/service/echo/v1"
 )
 
 func main() {
-	s := grpc.NewServer()
+	cert, err := tls.LoadX509KeyPair("./cert/server.pem", "./cert/server.key")
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	certPool := x509.NewCertPool()
+	ca, err := ioutil.ReadFile("./cert/ca.pem")
+	if err != nil {
+		log.Fatal(err)
+	}
+	if ok := certPool.AppendCertsFromPEM(ca); !ok {
+		log.Fatal("failed to append certs")
+	}
+
+	creds := credentials.NewTLS(&tls.Config{
+		Certificates: []tls.Certificate{cert},
+		ClientAuth:   tls.RequireAndVerifyClientCert, // NOTE: this is optional!
+		ClientCAs:    certPool,
+	})
+
+	s := grpc.NewServer(grpc.Creds(creds))
 	pb.RegisterEchoServiceServer(s, srv.NewService())
 	lis, err := net.Listen("tcp", ":9090")
 	if err != nil {
diff --git a/go.mod b/go.mod
index c3312c3..bfbd0c3 100644
--- a/go.mod
+++ b/go.mod
@@ -6,6 +6,7 @@ require (
 	github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b
 	github.com/golang/protobuf v1.4.3
 	github.com/grpc-ecosystem/grpc-gateway/v2 v2.1.0
+	github.com/sirupsen/logrus v1.7.0
 	google.golang.org/genproto v0.0.0-20210108203827-ffc7fda8c3d7
 	google.golang.org/grpc v1.34.0
 	google.golang.org/protobuf v1.25.0
diff --git a/go.sum b/go.sum
index 3fa57d4..3819ee4 100644
--- a/go.sum
+++ b/go.sum
@@ -42,6 +42,8 @@ github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDk
 github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod h1:M8M6+tZqaGXZJjfX53e64911xZQV5JYwmTeXPW+k8Sc=
 github.com/cncf/udpa/go v0.0.0-20200629203442-efcf912fb354/go.mod h1:WmhPx2Nbnhtbo57+VJT5O0JRkEi1Wbu0z5j0R8u5Hbk=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/envoyproxy/go-control-plane v0.9.0/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
 github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
 github.com/envoyproxy/go-control-plane v0.9.4/go.mod h1:6rpuAdCZL397s3pYoYcLgu1mIlRU8Am5FuJP05cCM98=
@@ -111,15 +113,22 @@ github.com/ianlancetaylor/demangle v0.0.0-20181102032728-5e5cf60278f6/go.mod h1:
 github.com/jstemmer/go-junit-report v0.0.0-20190106144839-af01ea7f8024/go.mod h1:6v2b51hI/fHJwM22ozAgKL4VKDeJcHhJFhtBdhmNjmU=
 github.com/jstemmer/go-junit-report v0.9.1/go.mod h1:Brl9GWCQeLvo8nXZwPNNblvFj/XSXhF0NWZEnDohbsk=
 github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck=
+github.com/kr/pretty v0.1.0 h1:L/CwN0zerZDmRFUapSPitk6f+Q3+0za1rQkzVuMiMFI=
 github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
 github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
+github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/prometheus/client_model v0.0.0-20190812154241-14fe0d1b01d4/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
 github.com/rogpeppe/fastuuid v1.2.0/go.mod h1:jVj6XXZzXRy/MSR5jhDC/2q6DgLz+nrA6LYCDYWNEvQ=
 github.com/rogpeppe/go-internal v1.3.0/go.mod h1:M8bDsm7K2OlrFYOpmOWEs/qY81heoFRclV5y23lUDJ4=
+github.com/sirupsen/logrus v1.7.0 h1:ShrD1U9pZB12TX0cVy0DtePoCH97K8EtX+mg7ZARUtM=
+github.com/sirupsen/logrus v1.7.0/go.mod h1:yWOB1SBYBC5VeMP7gHvWumXLIWorT60ONWic61uBYv0=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
 github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
+github.com/stretchr/testify v1.5.1 h1:nOGnQDM7FYENwehXlg/kFVnos3rEvtKTjRvOWSzb6H4=
 github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
 github.com/yuin/goldmark v1.1.25/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 github.com/yuin/goldmark v1.1.27/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
@@ -215,6 +224,7 @@ golang.org/x/sys v0.0.0-20190606165138-5da285871e9c/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20190624142023-c5567b49c5d0/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190726091711-fc99dfbffb4e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20191001151750-bb3f8db39f24/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20191026070338-33540a1f6037/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20191204072324-ce4227a45e2e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20191228213918-04cbcbbfeed8/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200113162924-86b910548bc1/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
@@ -367,6 +377,7 @@ google.golang.org/protobuf v1.24.0/go.mod h1:r/3tXBNzIEhYS9I1OUVjXDlt8tc493IdKGj
 google.golang.org/protobuf v1.25.0 h1:Ejskq+SyPohKW+1uil0JJMtmHCgJPJ/qWTxr8qp+R4c=
 google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=