github.com/uber/kraken@v0.1.4/build-index/tagmodels/models.go (about)

     1  // Copyright (c) 2016-2019 Uber Technologies, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  package tagmodels
    15  
    16  import (
    17  	"fmt"
    18  	"io"
    19  	"net/url"
    20  )
    21  
    22  const (
    23  	// Filters.
    24  	LimitQ  string = "limit"
    25  	OffsetQ string = "offset"
    26  )
    27  
    28  // List Response with pagination. Models tagserver reponse to list and
    29  // listRepository.
    30  type ListResponse struct {
    31  	Links struct {
    32  		Next string `json:"next"`
    33  		Self string `json:"self"`
    34  	}
    35  	Size   int      `json:"size"`
    36  	Result []string `json:"result"`
    37  }
    38  
    39  // GetOffset returns offset token from the ListResponse struct.
    40  // Returns token if present, io.EOF if Next is empty, error otherwise.
    41  func (resp ListResponse) GetOffset() (string, error) {
    42  	if resp.Links.Next == "" {
    43  		return "", io.EOF
    44  	}
    45  
    46  	nextUrl, err := url.Parse(resp.Links.Next)
    47  	if err != nil {
    48  		return "", err
    49  	}
    50  	val, err := url.ParseQuery(nextUrl.RawQuery)
    51  	if err != nil {
    52  		return "", err
    53  	}
    54  	offset := val.Get(OffsetQ)
    55  	if offset == "" {
    56  		return "", fmt.Errorf("invalid offset in %s", resp.Links.Next)
    57  	}
    58  	return offset, nil
    59  }