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limiter.go
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limiter.go
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package limiter
import (
"context"
"github.com/ulule/limiter/v3"
"github.com/ulule/limiter/v3/drivers/store/memory"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
// NewLimiter for gRPC.
func NewLimiter(formatted string) (*limiter.Limiter, error) {
rate, err := limiter.NewRateFromFormatted(formatted)
if err != nil {
return nil, err
}
store := memory.NewStore()
return limiter.New(store, rate), nil
}
// KeyFunc to get for gRPC.
type KeyFunc func(context.Context) string
// UnaryServerInterceptor for gRPC.
func UnaryServerInterceptor(limiter *limiter.Limiter, key KeyFunc) grpc.UnaryServerInterceptor {
return func(ctx context.Context, req any, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (any, error) {
context, err := limiter.Get(ctx, key(ctx))
if err != nil {
return nil, err
}
if context.Reached {
return nil, status.Errorf(codes.ResourceExhausted, "limit: %d allowed", context.Limit)
}
return handler(ctx, req)
}
}
// StreamServerInterceptor for gRPC.
func StreamServerInterceptor(limiter *limiter.Limiter, key KeyFunc) grpc.StreamServerInterceptor {
return func(srv any, stream grpc.ServerStream, info *grpc.StreamServerInfo, handler grpc.StreamHandler) error {
ctx := stream.Context()
context, err := limiter.Get(ctx, key(ctx))
if err != nil {
return err
}
if context.Reached {
return status.Errorf(codes.ResourceExhausted, "limit: %d allowed", context.Limit)
}
return handler(srv, stream)
}
}