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server.go
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server.go
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package main
import (
"context"
"fmt"
"html/template"
"log"
"net"
"net/http"
hello "github.com/stuttgart-things/cameo/hello" // Import the generated protobuf package
"google.golang.org/grpc"
)
// gRPC server implementation
type server struct {
hello.UnimplementedGreeterServer
}
// SayHello implements the gRPC SayHello method
func (s *server) SayHello(ctx context.Context, in *hello.HelloRequest) (*hello.HelloReply, error) {
return &hello.HelloReply{Message: "Hello " + in.GetName()}, nil
}
// PageData is used to pass data into the template
type PageData struct {
Title string
}
// renderForm renders the form page
func renderForm(w http.ResponseWriter, r *http.Request) {
tmpl := template.Must(template.ParseFiles("index.html"))
data := PageData{Title: "HTMX Form Example with gRPC"}
tmpl.Execute(w, data)
}
// handleSubmit handles the form submission
func handleSubmit(w http.ResponseWriter, r *http.Request) {
if r.Method != http.MethodPost {
http.Error(w, "Invalid request method", http.StatusMethodNotAllowed)
return
}
// Get form data
name := r.FormValue("name")
email := r.FormValue("email")
// Return a response to update the page dynamically
response := fmt.Sprintf("<div><p><strong>Name:</strong> %s</p><p><strong>Email:</strong> %s</p></div>", name, email)
w.Header().Set("Content-Type", "text/html")
fmt.Fprintln(w, response)
}
func main() {
// HTTP server part
http.HandleFunc("/", renderForm)
http.HandleFunc("/submit", handleSubmit)
// gRPC server part
grpcServer := grpc.NewServer()
hello.RegisterGreeterServer(grpcServer, &server{})
// Start gRPC server
go func() {
lis, err := net.Listen("tcp", ":50051")
if err != nil {
log.Fatalf("Failed to listen: %v", err)
}
log.Println("gRPC server listening on :50051")
if err := grpcServer.Serve(lis); err != nil {
log.Fatalf("Failed to serve gRPC server: %v", err)
}
}()
// Start HTTP server
fmt.Println("HTTP server running at http://localhost:8080/")
log.Fatal(http.ListenAndServe(":8080", nil))
}