mirror of
https://github.com/dutchcoders/transfer.sh.git
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280 lines
8 KiB
Go
280 lines
8 KiB
Go
// Copyright 2018, OpenCensus Authors
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//
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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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"math"
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"sync"
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"sync/atomic"
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"time"
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"go.opencensus.io/internal/tagencoding"
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"go.opencensus.io/metric/metricdata"
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)
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// gauge represents a quantity that can go up an down, for example queue depth
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// or number of outstanding requests.
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//
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// gauge maintains a value for each combination of of label values passed to
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// the Set or Add methods.
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//
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// gauge should not be used directly, use Float64Gauge or Int64Gauge.
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type gauge struct {
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vals sync.Map
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desc metricdata.Descriptor
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start time.Time
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keys []string
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gType gaugeType
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}
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type gaugeEntry interface {
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read(t time.Time) metricdata.Point
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}
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// Read returns the current values of the gauge as a metric for export.
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func (g *gauge) read() *metricdata.Metric {
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now := time.Now()
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m := &metricdata.Metric{
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Descriptor: g.desc,
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}
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g.vals.Range(func(k, v interface{}) bool {
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entry := v.(gaugeEntry)
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key := k.(string)
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labelVals := g.labelValues(key)
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m.TimeSeries = append(m.TimeSeries, &metricdata.TimeSeries{
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StartTime: now, // Gauge value is instantaneous.
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LabelValues: labelVals,
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Points: []metricdata.Point{
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entry.read(now),
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},
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})
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return true
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})
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return m
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}
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func (g *gauge) mapKey(labelVals []metricdata.LabelValue) string {
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vb := &tagencoding.Values{}
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for _, v := range labelVals {
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b := make([]byte, 1, len(v.Value)+1)
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if v.Present {
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b[0] = 1
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b = append(b, []byte(v.Value)...)
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}
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vb.WriteValue(b)
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}
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return string(vb.Bytes())
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}
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func (g *gauge) labelValues(s string) []metricdata.LabelValue {
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vals := make([]metricdata.LabelValue, 0, len(g.keys))
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vb := &tagencoding.Values{Buffer: []byte(s)}
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for range g.keys {
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v := vb.ReadValue()
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if v[0] == 0 {
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vals = append(vals, metricdata.LabelValue{})
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} else {
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vals = append(vals, metricdata.NewLabelValue(string(v[1:])))
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}
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}
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return vals
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}
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func (g *gauge) entryForValues(labelVals []metricdata.LabelValue, newEntry func() gaugeEntry) (interface{}, error) {
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if len(labelVals) != len(g.keys) {
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return nil, errKeyValueMismatch
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}
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mapKey := g.mapKey(labelVals)
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if entry, ok := g.vals.Load(mapKey); ok {
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return entry, nil
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}
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entry, _ := g.vals.LoadOrStore(mapKey, newEntry())
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return entry, nil
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}
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func (g *gauge) upsertEntry(labelVals []metricdata.LabelValue, newEntry func() gaugeEntry) error {
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if len(labelVals) != len(g.keys) {
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return errKeyValueMismatch
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}
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mapKey := g.mapKey(labelVals)
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g.vals.Delete(mapKey)
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g.vals.Store(mapKey, newEntry())
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return nil
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}
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// Float64Gauge represents a float64 value that can go up and down.
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//
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// Float64Gauge maintains a float64 value for each combination of of label values
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// passed to the Set or Add methods.
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type Float64Gauge struct {
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g gauge
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}
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// Float64Entry represents a single value of the gauge corresponding to a set
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// of label values.
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type Float64Entry struct {
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val uint64 // needs to be uint64 for atomic access, interpret with math.Float64frombits
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}
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func (e *Float64Entry) read(t time.Time) metricdata.Point {
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v := math.Float64frombits(atomic.LoadUint64(&e.val))
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if v < 0 {
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v = 0
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}
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return metricdata.NewFloat64Point(t, v)
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}
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// GetEntry returns a gauge entry where each key for this gauge has the value
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// given.
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//
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// The number of label values supplied must be exactly the same as the number
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// of keys supplied when this gauge was created.
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func (g *Float64Gauge) GetEntry(labelVals ...metricdata.LabelValue) (*Float64Entry, error) {
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entry, err := g.g.entryForValues(labelVals, func() gaugeEntry {
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return &Float64Entry{}
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})
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if err != nil {
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return nil, err
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}
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return entry.(*Float64Entry), nil
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}
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// Set sets the gauge entry value to val.
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func (e *Float64Entry) Set(val float64) {
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atomic.StoreUint64(&e.val, math.Float64bits(val))
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}
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// Add increments the gauge entry value by val.
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func (e *Float64Entry) Add(val float64) {
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var swapped bool
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for !swapped {
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oldVal := atomic.LoadUint64(&e.val)
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newVal := math.Float64bits(math.Float64frombits(oldVal) + val)
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swapped = atomic.CompareAndSwapUint64(&e.val, oldVal, newVal)
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}
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}
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// Int64Gauge represents a int64 gauge value that can go up and down.
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//
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// Int64Gauge maintains an int64 value for each combination of label values passed to the
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// Set or Add methods.
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type Int64Gauge struct {
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g gauge
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}
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// Int64GaugeEntry represents a single value of the gauge corresponding to a set
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// of label values.
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type Int64GaugeEntry struct {
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val int64
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}
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func (e *Int64GaugeEntry) read(t time.Time) metricdata.Point {
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v := atomic.LoadInt64(&e.val)
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if v < 0 {
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v = 0.0
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}
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return metricdata.NewInt64Point(t, v)
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}
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// GetEntry returns a gauge entry where each key for this gauge has the value
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// given.
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//
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// The number of label values supplied must be exactly the same as the number
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// of keys supplied when this gauge was created.
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func (g *Int64Gauge) GetEntry(labelVals ...metricdata.LabelValue) (*Int64GaugeEntry, error) {
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entry, err := g.g.entryForValues(labelVals, func() gaugeEntry {
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return &Int64GaugeEntry{}
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})
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if err != nil {
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return nil, err
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}
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return entry.(*Int64GaugeEntry), nil
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}
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// Set sets the value of the gauge entry to the provided value.
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func (e *Int64GaugeEntry) Set(val int64) {
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atomic.StoreInt64(&e.val, val)
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}
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// Add increments the current gauge entry value by val, which may be negative.
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func (e *Int64GaugeEntry) Add(val int64) {
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atomic.AddInt64(&e.val, val)
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}
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// Int64DerivedGauge represents int64 gauge value that is derived from an object.
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//
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// Int64DerivedGauge maintains objects for each combination of label values.
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// These objects implement Int64DerivedGaugeInterface to read instantaneous value
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// representing the object.
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type Int64DerivedGauge struct {
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g gauge
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}
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type int64DerivedGaugeEntry struct {
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fn func() int64
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}
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func (e *int64DerivedGaugeEntry) read(t time.Time) metricdata.Point {
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return metricdata.NewInt64Point(t, e.fn())
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}
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// UpsertEntry inserts or updates a derived gauge entry for the given set of label values.
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// The object for which this gauge entry is inserted or updated, must implement func() int64
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//
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// It returns an error if
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// 1. The number of label values supplied are not the same as the number
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// of keys supplied when this gauge was created.
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// 2. fn func() int64 is nil.
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func (g *Int64DerivedGauge) UpsertEntry(fn func() int64, labelVals ...metricdata.LabelValue) error {
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if fn == nil {
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return errInvalidParam
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}
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return g.g.upsertEntry(labelVals, func() gaugeEntry {
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return &int64DerivedGaugeEntry{fn}
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})
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}
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// Float64DerivedGauge represents float64 gauge value that is derived from an object.
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//
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// Float64DerivedGauge maintains objects for each combination of label values.
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// These objects implement Float64DerivedGaugeInterface to read instantaneous value
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// representing the object.
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type Float64DerivedGauge struct {
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g gauge
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}
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type float64DerivedGaugeEntry struct {
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fn func() float64
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}
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func (e *float64DerivedGaugeEntry) read(t time.Time) metricdata.Point {
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return metricdata.NewFloat64Point(t, e.fn())
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}
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// UpsertEntry inserts or updates a derived gauge entry for the given set of label values.
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// The object for which this gauge entry is inserted or updated, must implement func() float64
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//
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// It returns an error if
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// 1. The number of label values supplied are not the same as the number
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// of keys supplied when this gauge was created.
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// 2. fn func() float64 is nil.
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func (g *Float64DerivedGauge) UpsertEntry(fn func() float64, labelVals ...metricdata.LabelValue) error {
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if fn == nil {
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return errInvalidParam
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}
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return g.g.upsertEntry(labelVals, func() gaugeEntry {
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return &float64DerivedGaugeEntry{fn}
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})
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}
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