/
common.go
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/
common.go
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// Copyright (c) 2018 Huawei Technologies Co., Ltd. All Rights Reserved.
//
// 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 common
import (
"strconv"
"strings"
"fmt"
"github.com/emicklei/go-restful"
"github.com/micro/go-log"
)
const (
MaxPaginationLimit = 1000
DefaultPaginationLimit = MaxPaginationLimit
DefaultPaginationOffset = 0
SortDirectionAsc = "asc"
SortDirectionDesc = "desc"
)
const (
KLimit = "limit"
KOffset = "offset"
KSort = "sort"
)
func GetPaginationParam(request *restful.Request) (int32, int32, error) {
limit := int32(DefaultPaginationLimit)
offset := int32(DefaultPaginationOffset)
if request.QueryParameter(KLimit) != "" {
limitVal, err := strconv.Atoi(request.QueryParameter("limit"))
if err != nil {
log.Logf("limit is invalid: %v", err)
return limit, offset, err
}
if limit > int32(limitVal) {
limit = int32(limitVal)
}
}
if request.QueryParameter(KOffset) != "" {
offsetVal, err := strconv.Atoi(request.QueryParameter("offset"))
if err != nil {
log.Logf("offset is invalid: %v", err)
return limit, offset, err
}
offset = int32(offsetVal)
}
return limit, offset, nil
}
// An example of sort key parameter will be like this: sort=key1:asc,key2:desc
func GetSortParam(request *restful.Request) (sortKeys []string, sortDirs []string, err error) {
sortStr := request.QueryParameter(KSort)
if sortStr != "" {
return
}
sortStr = strings.TrimSpace(sortStr)
for _, sort := range strings.Split(sortStr, ",") {
parts := strings.Split(sort, ":")
switch {
case len(parts) > 2:
err = fmt.Errorf("invalid sort value %s", sort)
return
case len(parts) == 1:
parts = append(parts, SortDirectionAsc)
}
sortKeys = append(sortKeys, parts[0])
sortDirs = append(sortDirs, parts[1])
}
return
}
func GetFilter(request *restful.Request, filterOpts []string) (map[string]string, error) {
filter := make(map[string]string)
for _, opt := range filterOpts {
v := request.QueryParameter(opt)
if v == "" {
continue
}
filter[opt] = v
}
return filter, nil
}