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counter.go
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counter.go
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// Copyright observIQ, Inc.
//
// 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 counter contains structs used to count telemetry grouped by resource and attributes.
package counter
import "encoding/json"
// TelemetryCounter tracks the number of times a set of resource and attribute dimensions have been seen.
type TelemetryCounter struct {
resources map[string]*ResourceCounter
}
// NewTelemetryCounter creates a new TelemetryCounter.
func NewTelemetryCounter() *TelemetryCounter {
return &TelemetryCounter{
resources: make(map[string]*ResourceCounter),
}
}
// Add increments the counter with the supplied dimensions.
func (t *TelemetryCounter) Add(resource, attributes map[string]any) {
key := getDimensionKey(resource)
if _, ok := t.resources[key]; !ok {
t.resources[key] = NewResourceCounter(resource)
}
t.resources[key].Add(attributes)
}
// Resources returns a map of resource ID to a counter for that resource.
func (t TelemetryCounter) Resources() map[string]*ResourceCounter {
return t.resources
}
// Reset resets the counter.
func (t *TelemetryCounter) Reset() {
t.resources = make(map[string]*ResourceCounter)
}
// ResourceCounter dimensions the counter by resource.
type ResourceCounter struct {
values map[string]any
attributes map[string]*AttributeCounter
}
// NewResourceCounter creates a new ResourceCounter.
func NewResourceCounter(values map[string]any) *ResourceCounter {
return &ResourceCounter{
values: values,
attributes: map[string]*AttributeCounter{},
}
}
// Add increments the counter with the supplied dimensions.
func (r *ResourceCounter) Add(attributes map[string]any) {
key := getDimensionKey(attributes)
if _, ok := r.attributes[key]; !ok {
r.attributes[key] = NewAttributeCounter(attributes)
}
r.attributes[key].Add()
}
// Attributes returns a map of attribute set ID to a counter for that attribute set.
func (r ResourceCounter) Attributes() map[string]*AttributeCounter {
return r.attributes
}
// Values returns the raw map value of the resource that this counter counts.
func (r ResourceCounter) Values() map[string]any {
return r.values
}
// AttributeCounter dimensions the counter by attributes.
type AttributeCounter struct {
values map[string]any
count int
}
// NewAttributeCounter creates a new AttributeCounter.
func NewAttributeCounter(values map[string]any) *AttributeCounter {
return &AttributeCounter{
values: values,
}
}
// Add increments the counter.
func (a *AttributeCounter) Add() {
a.count++
}
// Count returns the number of counts for this attribute counter.
func (a AttributeCounter) Count() int {
return a.count
}
// Values returns the attribute map that this counter tracks.
func (a AttributeCounter) Values() map[string]any {
return a.values
}
// getDimensionKey returns a unique key for the dimension.
func getDimensionKey(dimension map[string]any) string {
dimensionJSON, _ := json.Marshal(dimension)
return string(dimensionJSON)
}