/
gameservers_count.go
72 lines (65 loc) · 2.35 KB
/
gameservers_count.go
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// Copyright 2019 Google Inc. All Rights Reserved.
//
// 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 metrics
import (
"context"
stablev1alpha1 "agones.dev/agones/pkg/apis/stable/v1alpha1"
"go.opencensus.io/stats"
"go.opencensus.io/tag"
"k8s.io/apimachinery/pkg/util/errors"
)
// GameServerCount is the count of gameserver per current state and per fleet name
type GameServerCount map[stablev1alpha1.GameServerState]map[string]int64
// increment adds the count of gameservers for a given fleetName and state
func (c GameServerCount) increment(fleetName string, state stablev1alpha1.GameServerState) {
fleets, ok := c[state]
if !ok {
fleets = map[string]int64{}
c[state] = fleets
}
fleets[fleetName]++
}
// reset sets zero to the whole metrics set
func (c GameServerCount) reset() {
for _, fleets := range c {
for fleet := range fleets {
fleets[fleet] = 0
}
}
}
// record counts the list of gameserver per status and fleet name and record it to OpenCensus
func (c GameServerCount) record(gameservers []*stablev1alpha1.GameServer) error {
// Currently there is no way to remove a metric so we have to reset our values to zero
// so that statuses that have no count anymore are zeroed.
// Otherwise OpenCensus will write the last value recorded to the prom endpoint.
// TL;DR we can't remove a gauge
c.reset()
// counts gameserver per state and fleet
for _, g := range gameservers {
c.increment(g.Labels[stablev1alpha1.FleetNameLabel], g.Status.State)
}
errs := []error{}
for state, fleets := range c {
for fleet, count := range fleets {
if fleet == "" {
fleet = "none"
}
if err := stats.RecordWithTags(context.Background(), []tag.Mutator{tag.Upsert(keyType, string(state)),
tag.Upsert(keyFleetName, fleet)}, gameServerCountStats.M(count)); err != nil {
errs = append(errs, err)
}
}
}
return errors.NewAggregate(errs)
}