Data commit

Task/Distributed-programming/Go/distributed-programming-4.go

@@ -0,0 +1,34 @@
+package main
+
+import (
+    "errors"
+    "net"
+
+    "golang.org/x/net/context"
+    "google.golang.org/grpc"
+    "google.golang.org/grpc/grpclog"
+
+    "taxcomputer"
+)
+
+type taxServer struct {
+    rate float64
+}
+
+func (s *taxServer) Tax(ctx context.Context,
+    amt *taxcomputer.Amount) (*taxcomputer.Amount, error) {
+    if amt.Cents < 0 {
+        return nil, errors.New("Negative amounts not allowed")
+    }
+    return &taxcomputer.Amount{int32(float64(amt.Cents)*s.rate + .5)}, nil
+}
+
+func main() {
+    listener, err := net.Listen("tcp", ":1234")
+    if err != nil {
+        grpclog.Fatalf(err.Error())
+    }
+    grpcServer := grpc.NewServer()
+    taxcomputer.RegisterTaxComputerServer(grpcServer, &taxServer{.05})
+    grpcServer.Serve(listener)
+}