132 lines
3.0 KiB
Go
132 lines
3.0 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 model
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import (
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"bytes"
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"fmt"
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"sort"
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"time"
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)
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const (
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// XXX: Re-evaluate down the road.
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reservedDelimiter = `"`
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)
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// A LabelSet is a collection of LabelName and LabelValue pairs. The LabelSet
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// may be fully-qualified down to the point where it may resolve to a single
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// Metric in the data store or not. All operations that occur within the realm
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// of a LabelSet can emit a vector of Metric entities to which the LabelSet may
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// match.
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type LabelSet map[LabelName]LabelValue
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func (l LabelSet) String() string {
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var (
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buffer bytes.Buffer
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labels LabelNames
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labelCount int = len(l)
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)
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for name := range l {
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labels = append(labels, name)
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}
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sort.Sort(labels)
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fmt.Fprintf(&buffer, "{")
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for i := 0; i < labelCount; i++ {
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var (
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label = labels[i]
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value = l[label]
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)
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switch i {
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case labelCount - 1:
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fmt.Fprintf(&buffer, "%s=%s", label, value)
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default:
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fmt.Fprintf(&buffer, "%s=%s, ", label, value)
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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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// A Metric is similar to a LabelSet, but the key difference is that a Metric is
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// a singleton and refers to one and only one stream of samples.
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type Metric map[LabelName]LabelValue
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// A SampleValue is a representation of a value for a given sample at a given
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// time. It is presently float32 due to that being the representation that
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// Protocol Buffers provide of floats in Go. This is a smell and should be
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// remedied down the road.
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type SampleValue float32
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func (v SampleValue) MarshalJSON() ([]byte, error) {
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return []byte(fmt.Sprintf("\"%f\"", v)), nil
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}
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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.Unix())), nil
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}
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type SamplePair struct {
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Value SampleValue
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Timestamp time.Time
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}
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type Values []SamplePair
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func (v Values) Len() int {
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return len(v)
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}
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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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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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// 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 time.Time) (s bool) {
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if v.Len() == 0 {
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return
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}
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if t.Before(v[0].Timestamp) {
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return
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}
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if !v[v.Len()-1].Timestamp.Before(t) {
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return
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}
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return true
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}
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type SampleSet struct {
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Metric Metric
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Values Values
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}
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type Interval struct {
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OldestInclusive time.Time
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NewestInclusive time.Time
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}
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