vikunja-api/pkg/metrics/metrics.go

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// Vikunja is a todo-list application to facilitate your life.
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// Copyright 2018-2020 Vikunja and contributors. All rights reserved.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
package metrics
import (
"code.vikunja.io/api/pkg/config"
"code.vikunja.io/api/pkg/log"
"code.vikunja.io/api/pkg/red"
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"github.com/go-redis/redis"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promauto"
)
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var r *redis.Client
const (
// ListCountKey is the name of the key in which we save the list count
ListCountKey = `listcount`
// UserCountKey is the name of the key we use to store total users in redis
UserCountKey = `usercount`
// NamespaceCountKey is the name of the key we use to store the amount of total namespaces in redis
NamespaceCountKey = `namespacecount`
// TaskCountKey is the name of the key we use to store the amount of total tasks in redis
TaskCountKey = `taskcount`
// TeamCountKey is the name of the key we use to store the amount of total teams in redis
TeamCountKey = `teamcount`
)
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// InitMetrics Initializes the metrics
func InitMetrics() {
r = red.GetRedis()
// Register total list count metric
promauto.NewGaugeFunc(prometheus.GaugeOpts{
Name: "vikunja_list_count",
Help: "The number of lists on this instance",
}, func() float64 {
count, _ := GetCount(ListCountKey)
return float64(count)
})
// Register total user count metric
promauto.NewGaugeFunc(prometheus.GaugeOpts{
Name: "vikunja_user_count",
Help: "The total number of users on this instance",
}, func() float64 {
count, _ := GetCount(UserCountKey)
return float64(count)
})
// Register total Namespaces count metric
promauto.NewGaugeFunc(prometheus.GaugeOpts{
Name: "vikunja_namespcae_count",
Help: "The total number of namespaces on this instance",
}, func() float64 {
count, _ := GetCount(NamespaceCountKey)
return float64(count)
})
// Register total Tasks count metric
promauto.NewGaugeFunc(prometheus.GaugeOpts{
Name: "vikunja_task_count",
Help: "The total number of tasks on this instance",
}, func() float64 {
count, _ := GetCount(TaskCountKey)
return float64(count)
})
// Register total user count metric
promauto.NewGaugeFunc(prometheus.GaugeOpts{
Name: "vikunja_team_count",
Help: "The total number of teams on this instance",
}, func() float64 {
count, _ := GetCount(TeamCountKey)
return float64(count)
})
}
// GetCount returns the current count from redis
func GetCount(key string) (count int64, err error) {
count, err = r.Get(key).Int64()
if err != nil && err.Error() != "redis: nil" {
return
}
err = nil
return
}
// SetCount sets the list count to a given value
func SetCount(count int64, key string) error {
return r.Set(key, count, 0).Err()
}
// UpdateCount updates a count with a given amount
func UpdateCount(update int64, key string) {
if !config.ServiceEnableMetrics.GetBool() {
return
}
if update > 0 {
err := r.IncrBy(key, update).Err()
if err != nil {
log.Error(err.Error())
}
}
if update < 0 {
err := r.DecrBy(key, update).Err()
if err != nil {
log.Error(err.Error())
}
}
}