mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-11-14 10:20:20 +00:00
106 lines
2.5 KiB
Go
106 lines
2.5 KiB
Go
// Copyright 2013 The Prometheus Authors
|
|
// 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 model
|
|
|
|
import (
|
|
"fmt"
|
|
"strconv"
|
|
)
|
|
|
|
// Fingerprint provides a hash-capable representation of a Metric.
|
|
// For our purposes, FNV-1A 64-bit is used.
|
|
type Fingerprint uint64
|
|
|
|
// FingerprintFromString transforms a string representation into a Fingerprint.
|
|
func FingerprintFromString(s string) (Fingerprint, error) {
|
|
num, err := strconv.ParseUint(s, 16, 64)
|
|
return Fingerprint(num), err
|
|
}
|
|
|
|
// ParseFingerprint parses the input string into a fingerprint.
|
|
func ParseFingerprint(s string) (Fingerprint, error) {
|
|
num, err := strconv.ParseUint(s, 16, 64)
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
return Fingerprint(num), nil
|
|
}
|
|
|
|
func (f Fingerprint) String() string {
|
|
return fmt.Sprintf("%016x", uint64(f))
|
|
}
|
|
|
|
// Fingerprints represents a collection of Fingerprint subject to a given
|
|
// natural sorting scheme. It implements sort.Interface.
|
|
type Fingerprints []Fingerprint
|
|
|
|
// Len implements sort.Interface.
|
|
func (f Fingerprints) Len() int {
|
|
return len(f)
|
|
}
|
|
|
|
// Less implements sort.Interface.
|
|
func (f Fingerprints) Less(i, j int) bool {
|
|
return f[i] < f[j]
|
|
}
|
|
|
|
// Swap implements sort.Interface.
|
|
func (f Fingerprints) Swap(i, j int) {
|
|
f[i], f[j] = f[j], f[i]
|
|
}
|
|
|
|
// FingerprintSet is a set of Fingerprints.
|
|
type FingerprintSet map[Fingerprint]struct{}
|
|
|
|
// Equal returns true if both sets contain the same elements (and not more).
|
|
func (s FingerprintSet) Equal(o FingerprintSet) bool {
|
|
if len(s) != len(o) {
|
|
return false
|
|
}
|
|
|
|
for k := range s {
|
|
if _, ok := o[k]; !ok {
|
|
return false
|
|
}
|
|
}
|
|
|
|
return true
|
|
}
|
|
|
|
// Intersection returns the elements contained in both sets.
|
|
func (s FingerprintSet) Intersection(o FingerprintSet) FingerprintSet {
|
|
myLength, otherLength := len(s), len(o)
|
|
if myLength == 0 || otherLength == 0 {
|
|
return FingerprintSet{}
|
|
}
|
|
|
|
subSet := s
|
|
superSet := o
|
|
|
|
if otherLength < myLength {
|
|
subSet = o
|
|
superSet = s
|
|
}
|
|
|
|
out := FingerprintSet{}
|
|
|
|
for k := range subSet {
|
|
if _, ok := superSet[k]; ok {
|
|
out[k] = struct{}{}
|
|
}
|
|
}
|
|
|
|
return out
|
|
}
|