150 lines
3.8 KiB
Go
150 lines
3.8 KiB
Go
// Copyright 2013 Prometheus Team
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package metric
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import (
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"bytes"
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"fmt"
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"sort"
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clientmodel "github.com/prometheus/client_golang/model"
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)
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// MarshalJSON implements json.Marshaler.
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func (s SamplePair) MarshalJSON() ([]byte, error) {
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return []byte(fmt.Sprintf("{\"Value\": \"%f\", \"Timestamp\": %d}", s.Value, s.Timestamp)), nil
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}
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// SamplePair pairs a SampleValue with a Timestamp.
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type SamplePair struct {
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Timestamp clientmodel.Timestamp
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Value clientmodel.SampleValue
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}
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// Equal returns true if this SamplePair and o have equal Values and equal
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// Timestamps.
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func (s *SamplePair) Equal(o *SamplePair) bool {
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if s == o {
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return true
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}
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return s.Value.Equal(o.Value) && s.Timestamp.Equal(o.Timestamp)
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}
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func (s *SamplePair) String() string {
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return fmt.Sprintf("SamplePair at %s of %s", s.Timestamp, s.Value)
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}
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// Values is a sortable slice of SamplePairs (as in: it implements
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// sort.Interface). Sorting happens by Timestamp.
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type Values []SamplePair
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// Len implements sort.Interface.
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func (v Values) Len() int {
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return len(v)
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}
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// Less implements sort.Interface.
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func (v Values) Less(i, j int) bool {
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return v[i].Timestamp.Before(v[j].Timestamp)
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}
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// Swap implements sort.Interface.
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func (v Values) Swap(i, j int) {
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v[i], v[j] = v[j], v[i]
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}
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// Equal returns true if these Values are of the same length as o, and each
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// value is equal to the corresponding value in o (i.e. at the same index).
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func (v Values) Equal(o Values) bool {
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if len(v) != len(o) {
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return false
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}
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for i, expected := range v {
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if !expected.Equal(&o[i]) {
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return false
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}
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}
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return true
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}
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// FirstTimeAfter indicates whether the first sample of a set is after a given
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// timestamp.
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func (v Values) FirstTimeAfter(t clientmodel.Timestamp) bool {
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return v[0].Timestamp.After(t)
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}
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// LastTimeBefore indicates whether the last sample of a set is before a given
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// timestamp.
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func (v Values) LastTimeBefore(t clientmodel.Timestamp) bool {
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return v[len(v)-1].Timestamp.Before(t)
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}
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// InsideInterval indicates whether a given range of sorted values could contain
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// a value for a given time.
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func (v Values) InsideInterval(t clientmodel.Timestamp) bool {
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switch {
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case v.Len() == 0:
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return false
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case t.Before(v[0].Timestamp):
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return false
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case !v[v.Len()-1].Timestamp.Before(t):
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return false
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default:
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return true
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}
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}
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// TruncateBefore returns a subslice of the original such that extraneous
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// samples in the collection that occur before the provided time are
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// dropped. The original slice is not mutated.
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func (v Values) TruncateBefore(t clientmodel.Timestamp) Values {
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index := sort.Search(len(v), func(i int) bool {
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timestamp := v[i].Timestamp
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return !timestamp.Before(t)
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})
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return v[index:]
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}
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func (v Values) String() string {
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buffer := bytes.Buffer{}
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fmt.Fprintf(&buffer, "[")
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for i, value := range v {
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fmt.Fprintf(&buffer, "%d. %s", i, value)
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if i != len(v)-1 {
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fmt.Fprintf(&buffer, "\n")
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}
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}
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fmt.Fprintf(&buffer, "]")
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return buffer.String()
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}
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// SampleSet is Values with a Metric attached.
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type SampleSet struct {
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Metric clientmodel.Metric
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Values Values
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}
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// Interval describes the inclusive interval between two Timestamps.
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type Interval struct {
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OldestInclusive clientmodel.Timestamp
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NewestInclusive clientmodel.Timestamp
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}
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