mirror of
https://github.com/TwiN/gatus.git
synced 2024-11-28 10:53:20 +01:00
91 lines
3.0 KiB
Go
91 lines
3.0 KiB
Go
package watchdog
|
|
|
|
import (
|
|
"context"
|
|
"log"
|
|
"sync"
|
|
"time"
|
|
|
|
"github.com/TwinProduction/gatus/alerting"
|
|
"github.com/TwinProduction/gatus/config"
|
|
"github.com/TwinProduction/gatus/core"
|
|
"github.com/TwinProduction/gatus/metric"
|
|
"github.com/TwinProduction/gatus/storage"
|
|
)
|
|
|
|
var (
|
|
// monitoringMutex is used to prevent multiple services from being evaluated at the same time.
|
|
// Without this, conditions using response time may become inaccurate.
|
|
monitoringMutex sync.Mutex
|
|
|
|
ctx context.Context
|
|
cancelFunc context.CancelFunc
|
|
)
|
|
|
|
// Monitor loops over each services and starts a goroutine to monitor each services separately
|
|
func Monitor(cfg *config.Config) {
|
|
ctx, cancelFunc = context.WithCancel(context.Background())
|
|
for _, service := range cfg.Services {
|
|
// To prevent multiple requests from running at the same time, we'll wait for a little bit before each iteration
|
|
time.Sleep(1111 * time.Millisecond)
|
|
go monitor(service, cfg.Alerting, cfg.DisableMonitoringLock, cfg.Metrics, cfg.Debug, ctx)
|
|
}
|
|
}
|
|
|
|
// monitor monitors a single service in a loop
|
|
func monitor(service *core.Service, alertingConfig *alerting.Config, disableMonitoringLock, enabledMetrics, debug bool, ctx context.Context) {
|
|
// Run it immediately on start
|
|
execute(service, alertingConfig, disableMonitoringLock, enabledMetrics, debug)
|
|
// Loop for the next executions
|
|
for {
|
|
select {
|
|
case <-ctx.Done():
|
|
log.Printf("[watchdog][monitor] Canceling current execution of group=%s; service=%s", service.Group, service.Name)
|
|
return
|
|
case <-time.After(service.Interval):
|
|
execute(service, alertingConfig, disableMonitoringLock, enabledMetrics, debug)
|
|
}
|
|
}
|
|
}
|
|
|
|
func execute(service *core.Service, alertingConfig *alerting.Config, disableMonitoringLock, enabledMetrics, debug bool) {
|
|
if !disableMonitoringLock {
|
|
// By placing the lock here, we prevent multiple services from being monitored at the exact same time, which
|
|
// could cause performance issues and return inaccurate results
|
|
monitoringMutex.Lock()
|
|
}
|
|
if debug {
|
|
log.Printf("[watchdog][execute] Monitoring group=%s; service=%s", service.Group, service.Name)
|
|
}
|
|
result := service.EvaluateHealth()
|
|
if enabledMetrics {
|
|
metric.PublishMetricsForService(service, result)
|
|
}
|
|
UpdateServiceStatuses(service, result)
|
|
log.Printf(
|
|
"[watchdog][execute] Monitored group=%s; service=%s; success=%v; errors=%d; duration=%s",
|
|
service.Group,
|
|
service.Name,
|
|
result.Success,
|
|
len(result.Errors),
|
|
result.Duration.Round(time.Millisecond),
|
|
)
|
|
HandleAlerting(service, result, alertingConfig, debug)
|
|
if debug {
|
|
log.Printf("[watchdog][execute] Waiting for interval=%s before monitoring group=%s service=%s again", service.Interval, service.Group, service.Name)
|
|
}
|
|
if !disableMonitoringLock {
|
|
monitoringMutex.Unlock()
|
|
}
|
|
}
|
|
|
|
// UpdateServiceStatuses updates the slice of service statuses
|
|
func UpdateServiceStatuses(service *core.Service, result *core.Result) {
|
|
storage.Get().Insert(service, result)
|
|
}
|
|
|
|
// Shutdown stops monitoring all services
|
|
func Shutdown() {
|
|
cancelFunc()
|
|
}
|