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reader.go
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/
reader.go
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package alerting
import (
"sync"
"time"
"github.com/grafana/grafana/pkg/bus"
"github.com/grafana/grafana/pkg/log"
"github.com/grafana/grafana/pkg/metrics"
m "github.com/grafana/grafana/pkg/models"
)
type RuleReader interface {
Fetch() []*Rule
}
type DefaultRuleReader struct {
sync.RWMutex
serverID string
serverPosition int
clusterSize int
log log.Logger
}
func NewRuleReader() *DefaultRuleReader {
ruleReader := &DefaultRuleReader{
log: log.New("alerting.ruleReader"),
}
go ruleReader.initReader()
return ruleReader
}
func (arr *DefaultRuleReader) initReader() {
heartbeat := time.NewTicker(time.Second * 10)
for {
select {
case <-heartbeat.C:
arr.heartbeat()
}
}
}
func (arr *DefaultRuleReader) Fetch() []*Rule {
cmd := &m.GetAllAlertsQuery{}
if err := bus.Dispatch(cmd); err != nil {
arr.log.Error("Could not load alerts", "error", err)
return []*Rule{}
}
res := make([]*Rule, 0)
for _, ruleDef := range cmd.Result {
if model, err := NewRuleFromDBAlert(ruleDef); err != nil {
arr.log.Error("Could not build alert model for rule", "ruleId", ruleDef.Id, "error", err)
} else {
res = append(res, model)
}
}
metrics.M_Alerting_Active_Alerts.Update(int64(len(res)))
return res
}
func (arr *DefaultRuleReader) heartbeat() {
//Lets cheat on this until we focus on clustering
//log.Info("Heartbeat: Sending heartbeat from " + this.serverId)
arr.clusterSize = 1
arr.serverPosition = 1
/*
cmd := &m.HeartBeatCommand{ServerId: this.serverId}
err := bus.Dispatch(cmd)
if err != nil {
log.Error(1, "Failed to send heartbeat.")
} else {
this.clusterSize = cmd.Result.ClusterSize
this.serverPosition = cmd.Result.UptimePosition
}
*/
}