forked from simplesteph/grpc-go-course
/
client.go
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/
client.go
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package main
import (
"context"
"fmt"
"io"
"log"
"time"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/credentials"
"github.com/simplesteph/grpc-go-course/greet/greetpb"
"google.golang.org/grpc"
"google.golang.org/grpc/status"
)
func main() {
fmt.Println("Hello I'm a client")
tls := false
opts := grpc.WithInsecure()
if tls {
certFile := "ssl/ca.crt" // Certificate Authority Trust certificate
creds, sslErr := credentials.NewClientTLSFromFile(certFile, "")
if sslErr != nil {
log.Fatalf("Error while loading CA trust certificate: %v", sslErr)
return
}
opts = grpc.WithTransportCredentials(creds)
}
cc, err := grpc.Dial("localhost:50051", opts)
if err != nil {
log.Fatalf("could not connect: %v", err)
}
defer cc.Close()
c := greetpb.NewGreetServiceClient(cc)
// fmt.Printf("Created client: %f", c)
doUnary(c)
// doServerStreaming(c)
// doClientStreaming(c)
// doBiDiStreaming(c)
// doUnaryWithDeadline(c, 5*time.Second) // should complete
// doUnaryWithDeadline(c, 1*time.Second) // should timeout
}
func doUnary(c greetpb.GreetServiceClient) {
fmt.Println("Starting to do a Unary RPC...")
req := &greetpb.GreetRequest{
Greeting: &greetpb.Greeting{
FirstName: "Stephane",
LastName: "Maarek",
},
}
res, err := c.Greet(context.Background(), req)
if err != nil {
log.Fatalf("error while calling Greet RPC: %v", err)
}
log.Printf("Response from Greet: %v", res.Result)
}
func doServerStreaming(c greetpb.GreetServiceClient) {
fmt.Println("Starting to do a Server Streaming RPC...")
req := &greetpb.GreetManyTimesRequest{
Greeting: &greetpb.Greeting{
FirstName: "Stephane",
LastName: "Maarek",
},
}
resStream, err := c.GreetManyTimes(context.Background(), req)
if err != nil {
log.Fatalf("error while calling GreetManyTimes RPC: %v", err)
}
for {
msg, err := resStream.Recv()
if err == io.EOF {
// we've reached the end of the stream
break
}
if err != nil {
log.Fatalf("error while reading stream: %v", err)
}
log.Printf("Response from GreetManyTimes: %v", msg.GetResult())
}
}
func doClientStreaming(c greetpb.GreetServiceClient) {
fmt.Println("Starting to do a Client Streaming RPC...")
requests := []*greetpb.LongGreetRequest{
&greetpb.LongGreetRequest{
Greeting: &greetpb.Greeting{
FirstName: "Stephane",
},
},
&greetpb.LongGreetRequest{
Greeting: &greetpb.Greeting{
FirstName: "John",
},
},
&greetpb.LongGreetRequest{
Greeting: &greetpb.Greeting{
FirstName: "Lucy",
},
},
&greetpb.LongGreetRequest{
Greeting: &greetpb.Greeting{
FirstName: "Mark",
},
},
&greetpb.LongGreetRequest{
Greeting: &greetpb.Greeting{
FirstName: "Piper",
},
},
}
stream, err := c.LongGreet(context.Background())
if err != nil {
log.Fatalf("error while calling LongGreet: %v", err)
}
// we iterate over our slice and send each message individually
for _, req := range requests {
fmt.Printf("Sending req: %v\n", req)
stream.Send(req)
time.Sleep(1000 * time.Millisecond)
}
res, err := stream.CloseAndRecv()
if err != nil {
log.Fatalf("error while receiving response from LongGreet: %v", err)
}
fmt.Printf("LongGreet Response: %v\n", res)
}
func doBiDiStreaming(c greetpb.GreetServiceClient) {
fmt.Println("Starting to do a BiDi Streaming RPC...")
// we create a stream by invoking the client
stream, err := c.GreetEveryone(context.Background())
if err != nil {
log.Fatalf("Error while creating stream: %v", err)
return
}
requests := []*greetpb.GreetEveryoneRequest{
&greetpb.GreetEveryoneRequest{
Greeting: &greetpb.Greeting{
FirstName: "Stephane",
},
},
&greetpb.GreetEveryoneRequest{
Greeting: &greetpb.Greeting{
FirstName: "John",
},
},
&greetpb.GreetEveryoneRequest{
Greeting: &greetpb.Greeting{
FirstName: "Lucy",
},
},
&greetpb.GreetEveryoneRequest{
Greeting: &greetpb.Greeting{
FirstName: "Mark",
},
},
&greetpb.GreetEveryoneRequest{
Greeting: &greetpb.Greeting{
FirstName: "Piper",
},
},
}
waitc := make(chan struct{})
// we send a bunch of messages to the client (go routine)
go func() {
// function to send a bunch of messages
for _, req := range requests {
fmt.Printf("Sending message: %v\n", req)
stream.Send(req)
time.Sleep(1000 * time.Millisecond)
}
stream.CloseSend()
}()
// we receive a bunch of messages from the client (go routine)
go func() {
// function to receive a bunch of messages
for {
res, err := stream.Recv()
if err == io.EOF {
break
}
if err != nil {
log.Fatalf("Error while receiving: %v", err)
break
}
fmt.Printf("Received: %v\n", res.GetResult())
}
close(waitc)
}()
// block until everything is done
<-waitc
}
func doUnaryWithDeadline(c greetpb.GreetServiceClient, timeout time.Duration) {
fmt.Println("Starting to do a UnaryWithDeadline RPC...")
req := &greetpb.GreetWithDeadlineRequest{
Greeting: &greetpb.Greeting{
FirstName: "Stephane",
LastName: "Maarek",
},
}
ctx, cancel := context.WithTimeout(context.Background(), timeout)
defer cancel()
res, err := c.GreetWithDeadline(ctx, req)
if err != nil {
statusErr, ok := status.FromError(err)
if ok {
if statusErr.Code() == codes.DeadlineExceeded {
fmt.Println("Timeout was hit! Deadline was exceeded")
} else {
fmt.Printf("unexpected error: %v", statusErr)
}
} else {
log.Fatalf("error while calling GreetWithDeadline RPC: %v", err)
}
return
}
log.Printf("Response from GreetWithDeadline: %v", res.Result)
}