mirror of
https://github.com/prometheus/prometheus.git
synced 2024-12-26 22:19:40 -08:00
117 lines
3.1 KiB
Go
117 lines
3.1 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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"crypto/md5"
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"encoding/hex"
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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 Fingerprint is a simplified representation of an entity---e.g., a hash of
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// an entire Metric.
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type Fingerprint string
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// A LabelName is a key for a LabelSet or Metric. It has a value associated
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// therewith.
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type LabelName string
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// A LabelValue is an associated value for a LabelName.
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type LabelValue string
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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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// 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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// Fingerprint generates a fingerprint for this given Metric.
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func (m Metric) Fingerprint() Fingerprint {
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labelLength := len(m)
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labelNames := make([]string, 0, labelLength)
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for labelName := range m {
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labelNames = append(labelNames, string(labelName))
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}
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sort.Strings(labelNames)
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summer := md5.New()
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buffer := bytes.Buffer{}
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for _, labelName := range labelNames {
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buffer.WriteString(labelName)
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buffer.WriteRune(reservedDelimiter)
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buffer.WriteString(string(m[LabelName(labelName)]))
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}
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summer.Write(buffer.Bytes())
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return Fingerprint(hex.EncodeToString(summer.Sum(nil)))
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}
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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 Sample struct {
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Metric Metric
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Value SampleValue
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Timestamp time.Time
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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 SampleSet struct {
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Metric Metric
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Values []SamplePair
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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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// PENDING DELETION BELOW THIS LINE
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type Samples struct {
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Value SampleValue
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Timestamp time.Time
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}
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