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package streamtimeout
import (
"context"
"fmt"
"time"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/metadata"
"github.com/authzed/spicedb/pkg/spiceerrors"
)
// MustStreamServerInterceptor returns a new stream server interceptor that cancels the context
// after a timeout if no new data has been received.
func MustStreamServerInterceptor(timeout time.Duration) grpc.StreamServerInterceptor {
if timeout <= 0 {
panic("timeout must be >= 0 for streaming timeout interceptor")
}
return func(srv any, stream grpc.ServerStream, info *grpc.StreamServerInfo, handler grpc.StreamHandler) error {
ctx := stream.Context()
withCancel, internalCancelFn := context.WithCancelCause(ctx)
timer := time.AfterFunc(timeout, func() {
internalCancelFn(spiceerrors.WithCodeAndDetailsAsError(fmt.Errorf("operation took longer than allowed %v to complete", timeout), codes.DeadlineExceeded))
})
wrapper := &sendWrapper{stream, withCancel, timer, timeout}
return handler(srv, wrapper)
}
}
type sendWrapper struct {
grpc.ServerStream
ctx context.Context
timer *time.Timer
timeout time.Duration
}
func (s *sendWrapper) Context() context.Context {
return s.ctx
}
func (s *sendWrapper) SetTrailer(_ metadata.MD) {
s.timer.Stop()
}
func (s *sendWrapper) SendMsg(m any) error {
err := s.ServerStream.SendMsg(m)
if err != nil {
s.timer.Stop()
} else {
s.timer.Reset(s.timeout)
}
return err
}
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