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package grpctool
import (
"context"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
// UnaryClientValidatingInterceptor is a unary client interceptor that performs response validation.
func UnaryClientValidatingInterceptor(parentCtx context.Context, method string, req, reply interface{}, cc *grpc.ClientConn, invoker grpc.UnaryInvoker, opts ...grpc.CallOption) error {
err := invoker(parentCtx, method, req, reply, cc, opts...)
if err != nil {
return err
}
return maybeValidate(reply)
}
// StreamClientValidatingInterceptor is a stream client interceptor that performs response stream validation.
func StreamClientValidatingInterceptor(parentCtx context.Context, desc *grpc.StreamDesc, cc *grpc.ClientConn, method string, streamer grpc.Streamer, opts ...grpc.CallOption) (grpc.ClientStream, error) {
stream, err := streamer(parentCtx, desc, cc, method, opts...)
if err != nil {
return nil, err
}
return recvWrapper{
ClientStream: stream,
}, nil
}
type validatable interface {
ValidateAll() error
}
type recvWrapper struct {
grpc.ClientStream
}
func (w recvWrapper) RecvMsg(m interface{}) error {
if err := w.ClientStream.RecvMsg(m); err != nil {
return err
}
return maybeValidate(m)
}
func maybeValidate(msg interface{}) error {
if v, ok := msg.(validatable); ok {
if err := v.ValidateAll(); err != nil {
return status.Errorf(codes.InvalidArgument, "invalid server response: %v", err)
}
}
return nil
}
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