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validator.go
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validator.go
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// Copyright 2016 Michal Witkowski. All Rights Reserved.
// See LICENSE for licensing terms.
package grpc_validator
import (
"context"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
type validator interface {
Validate() error
}
// UnaryServerInterceptor returns a new unary server interceptor that validates incoming messages.
//
// Invalid messages will be rejected with `InvalidArgument` before reaching any userspace handlers.
func UnaryServerInterceptor() grpc.UnaryServerInterceptor {
return func(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (interface{}, error) {
if v, ok := req.(validator); ok {
if err := v.Validate(); err != nil {
return nil, status.Errorf(codes.InvalidArgument, err.Error())
}
}
return handler(ctx, req)
}
}
// UnaryClientInterceptor returns a new unary client interceptor that validates outgoing messages.
//
// Invalid messages will be rejected with `InvalidArgument` before sending the request to server.
func UnaryClientInterceptor() grpc.UnaryClientInterceptor {
return func(ctx context.Context, method string, req, reply interface{}, cc *grpc.ClientConn, invoker grpc.UnaryInvoker, opts ...grpc.CallOption) error {
if v, ok := req.(validator); ok {
if err := v.Validate(); err != nil {
return status.Errorf(codes.InvalidArgument, err.Error())
}
}
return invoker(ctx, method, req, reply, cc, opts...)
}
}
// StreamServerInterceptor returns a new streaming server interceptor that validates incoming messages.
//
// The stage at which invalid messages will be rejected with `InvalidArgument` varies based on the
// type of the RPC. For `ServerStream` (1:m) requests, it will happen before reaching any userspace
// handlers. For `ClientStream` (n:1) or `BidiStream` (n:m) RPCs, the messages will be rejected on
// calls to `stream.Recv()`.
func StreamServerInterceptor() grpc.StreamServerInterceptor {
return func(srv interface{}, stream grpc.ServerStream, info *grpc.StreamServerInfo, handler grpc.StreamHandler) error {
wrapper := &recvWrapper{stream}
return handler(srv, wrapper)
}
}
type recvWrapper struct {
grpc.ServerStream
}
func (s *recvWrapper) RecvMsg(m interface{}) error {
if err := s.ServerStream.RecvMsg(m); err != nil {
return err
}
if v, ok := m.(validator); ok {
if err := v.Validate(); err != nil {
return status.Errorf(codes.InvalidArgument, err.Error())
}
}
return nil
}