github.com/m3db/m3@v1.5.0/src/metrics/filters/mock_filter.go (about)

     1  // Copyright (c) 2017 Uber Technologies, Inc.
     2  //
     3  // Permission is hereby granted, free of charge, to any person obtaining a copy
     4  // of this software and associated documentation files (the "Software"), to deal
     5  // in the Software without restriction, including without limitation the rights
     6  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     7  // copies of the Software, and to permit persons to whom the Software is
     8  // furnished to do so, subject to the following conditions:
     9  //
    10  // The above copyright notice and this permission notice shall be included in
    11  // all copies or substantial portions of the Software.
    12  //
    13  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    14  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    15  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    16  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    17  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    18  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    19  // THE SOFTWARE.
    20  
    21  package filters
    22  
    23  import (
    24  	"strings"
    25  
    26  	"github.com/m3db/m3/src/metrics/metric/id"
    27  )
    28  
    29  const (
    30  	mockTagPairSeparator  = ","
    31  	mockTagValueSeparator = "="
    32  )
    33  
    34  type mockTagPair struct {
    35  	name  []byte
    36  	value []byte
    37  }
    38  
    39  type mockSortedTagIterator struct {
    40  	idx   int
    41  	err   error
    42  	pairs []mockTagPair
    43  }
    44  
    45  func tagsToPairs(tags []byte) []mockTagPair {
    46  	tagPairs := strings.Split(string(tags), mockTagPairSeparator)
    47  	var pairs []mockTagPair
    48  	for _, pair := range tagPairs {
    49  		p := strings.Split(pair, mockTagValueSeparator)
    50  		pairs = append(pairs, mockTagPair{name: []byte(p[0]), value: []byte(p[1])})
    51  	}
    52  	return pairs
    53  }
    54  
    55  // NewMockSortedTagIterator creates a mock SortedTagIterator based on given ID.
    56  func NewMockSortedTagIterator(tags []byte) id.SortedTagIterator {
    57  	pairs := tagsToPairs(tags)
    58  	return &mockSortedTagIterator{idx: -1, pairs: pairs}
    59  }
    60  
    61  func (it *mockSortedTagIterator) Reset(tags []byte) {
    62  	it.idx = -1
    63  	it.err = nil
    64  	it.pairs = tagsToPairs(tags)
    65  }
    66  
    67  func (it *mockSortedTagIterator) Next() bool {
    68  	if it.err != nil || it.idx >= len(it.pairs) {
    69  		return false
    70  	}
    71  	it.idx++
    72  	return it.err == nil && it.idx < len(it.pairs)
    73  }
    74  
    75  func (it *mockSortedTagIterator) Current() ([]byte, []byte) {
    76  	return it.pairs[it.idx].name, it.pairs[it.idx].value
    77  }
    78  
    79  func (it *mockSortedTagIterator) Err() error {
    80  	return it.err
    81  }
    82  
    83  func (it *mockSortedTagIterator) Close() {}