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main.go
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main.go
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package main
import (
"context"
"crypto/x509"
"log"
"os"
"strconv"
"time"
"github.com/belak/grpc-token-auth/pb"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
)
func Env(key string) string {
val, ok := os.LookupEnv(key)
if !ok {
log.Fatalf("failed to look up variable: %s", key)
}
return val
}
func EnvDefault(key string, def string) string {
val, ok := os.LookupEnv(key)
if !ok {
return def
}
return val
}
func main() {
insecureRaw := EnvDefault("INSECURE", "false")
insecure, err := strconv.ParseBool(insecureRaw)
if err != nil {
log.Fatalf("failed to parse INSECURE value: %s", insecureRaw)
}
client, err := NewClient(ClientConfig{
DialTimeout: 5 * time.Second,
Token: Env("TOKEN"),
Addr: EnvDefault("SERVER_ADDR", "localhost:8000"),
Insecure: insecure,
})
if err != nil {
log.Fatalf("failed to connect: %s", err)
}
ctx := context.Background()
resp, err := client.Echo(ctx, &pb.EchoRequest{Message: "hello world"})
if err != nil {
log.Fatalf("failed send echo request: %s", err)
}
log.Printf("got echo response: %+v", resp)
stream, err := client.StreamingEcho(ctx)
if err != nil {
log.Fatalf("failed start echo stream: %s", err)
}
for i := 0; i < 5; i++ {
time.Sleep(1)
err := stream.Send(&pb.EchoRequest{Message: "hello world " + strconv.Itoa(i)})
if err != nil {
log.Fatalf("failed to send stream request %d: %s", i, err)
}
resp, err := stream.Recv()
if err != nil {
log.Fatalf("failed to receive stream response %d: %s", i, err)
}
log.Printf("got stream response %d: %+v", i, resp)
}
}
type ClientConfig struct {
Addr string
DialTimeout time.Duration
Token string
Insecure bool
}
func NewClient(config ClientConfig) (pb.EchoServiceClient, error) {
ctx := context.Background()
if config.DialTimeout > 0 {
newCtx, cancel := context.WithTimeout(ctx, config.DialTimeout)
defer cancel()
ctx = newCtx
}
var opt grpc.DialOption
if config.Insecure {
opt = grpc.WithInsecure()
} else {
certPool, err := x509.SystemCertPool()
if err != nil {
return nil, err
}
opt = grpc.WithTransportCredentials(credentials.NewClientTLSFromCert(certPool, ""))
}
conn, err := grpc.DialContext(ctx, config.Addr,
opt,
grpc.WithPerRPCCredentials(TokenAuth{
Token: config.Token,
Insecure: config.Insecure,
}),
grpc.WithBlock())
return pb.NewEchoServiceClient(conn), err
}
type TokenAuth struct {
Token string
Insecure bool
}
func (a TokenAuth) GetRequestMetadata(ctx context.Context, in ...string) (map[string]string, error) {
return map[string]string{
"Authorization": "Bearer " + a.Token,
}, nil
}
func (a TokenAuth) RequireTransportSecurity() bool {
return !a.Insecure
}