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rpc.go
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rpc.go
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package rpc
import (
"context"
"errors"
"fmt"
"net"
"google.golang.org/grpc"
"google.golang.org/grpc/metadata"
"github.com/emehrkay/cbt/internal/models/service"
rpcBase "github.com/emehrkay/cbt/pkg/rpc"
)
func New(trainService *service.Train) (*server, error) {
return &server{
service: trainService,
}, nil
}
type server struct {
rpcBase.UnimplementedTrainServer
service *service.Train
clentConn *grpc.ClientConn
}
func (s *server) Run(target string, options ...grpc.DialOption) error {
var err error
s.clentConn, err = grpc.NewClient(target, options...)
if err != nil {
return fmt.Errorf(`unable to create grpc connection to: %v -- %w`, target, err)
}
defer s.clentConn.Close()
listener, err := net.Listen("tcp", target)
if err != nil {
return fmt.Errorf(`unable to create tpc conn: %v -- %w`, target, err)
}
server := grpc.NewServer(
grpc.UnaryInterceptor(s.service.GetValidator().UnaryServerInterceptor),
)
rpcBase.RegisterTrainServer(server, s)
fmt.Printf("server listening at %v\n", listener.Addr())
go func() {
if err := server.Serve(listener); err != nil {
msg := fmt.Sprintf(`unable to start grpc server -- %v`, err)
panic(msg)
}
}()
return nil
}
func (s *server) tokenFromContextMetadata(ctx context.Context) (*string, error) {
// rip the token from the metadata via the context
headers, ok := metadata.FromIncomingContext(ctx)
if !ok {
return nil, errors.New("no metadata found in context")
}
tokens := headers.Get("jwt")
if len(tokens) < 1 {
return nil, errors.New("no token found in metadata")
}
tokenString := tokens[0]
return &tokenString, nil
}