/
pagination.go
47 lines (42 loc) · 1.21 KB
/
pagination.go
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// Copyright 2023 Igor Zibarev
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package grpcx
import (
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
// PageSizeRequest describes a request with page size parameter.
type PageSizeRequest interface {
GetPageSize() int32
}
func GetPageSize(
defaultPageSize int32,
maxPageSize int32,
req PageSizeRequest,
) (pageSize int32, err error) {
pageSize = defaultPageSize
if req.GetPageSize() != 0 {
pageSize = req.GetPageSize()
if pageSize < 0 {
return pageSize, status.Error(
codes.InvalidArgument,
`Invalid "page_size": value is less than zero.`,
)
}
}
if pageSize > maxPageSize {
pageSize = maxPageSize
}
return pageSize, nil
}