mirror of
https://github.com/TwiN/gatus.git
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82 lines
2.6 KiB
Go
82 lines
2.6 KiB
Go
package watchdog
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import (
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"encoding/json"
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"fmt"
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"github.com/TwinProduction/gatus/alerting"
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"github.com/TwinProduction/gatus/config"
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"github.com/TwinProduction/gatus/core"
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"github.com/TwinProduction/gatus/metric"
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"log"
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"sync"
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"time"
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)
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var (
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serviceResults = make(map[string][]*core.Result)
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// serviceResultsMutex is used to prevent concurrent map access
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serviceResultsMutex sync.RWMutex
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// monitoringMutex is used to prevent multiple services from being evaluated at the same time.
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// Without this, conditions using response time may become inaccurate.
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monitoringMutex sync.Mutex
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)
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// GetJsonEncodedServiceResults returns a list of the last 20 results for each services encoded using json.Marshal.
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// The reason why the encoding is done here is because we use a mutex to prevent concurrent map access.
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func GetJsonEncodedServiceResults() ([]byte, error) {
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serviceResultsMutex.RLock()
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data, err := json.Marshal(serviceResults)
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serviceResultsMutex.RUnlock()
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return data, err
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}
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// Monitor loops over each services and starts a goroutine to monitor each services separately
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func Monitor(cfg *config.Config) {
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for _, service := range cfg.Services {
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go monitor(service)
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// To prevent multiple requests from running at the same time
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time.Sleep(1111 * time.Millisecond)
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}
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}
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// monitor monitors a single service in a loop
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func monitor(service *core.Service) {
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cfg := config.Get()
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for {
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// By placing the lock here, we prevent multiple services from being monitored at the exact same time, which
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// could cause performance issues and return inaccurate results
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monitoringMutex.Lock()
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if cfg.Debug {
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log.Printf("[watchdog][monitor] Monitoring serviceName=%s", service.Name)
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}
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result := service.EvaluateConditions()
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metric.PublishMetricsForService(service, result)
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serviceResultsMutex.Lock()
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serviceResults[service.Name] = append(serviceResults[service.Name], result)
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if len(serviceResults[service.Name]) > 20 {
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serviceResults[service.Name] = serviceResults[service.Name][1:]
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}
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serviceResultsMutex.Unlock()
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var extra string
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if !result.Success {
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extra = fmt.Sprintf("responseBody=%s", result.Body)
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}
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log.Printf(
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"[watchdog][monitor] Monitored serviceName=%s; success=%v; errors=%d; requestDuration=%s; %s",
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service.Name,
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result.Success,
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len(result.Errors),
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result.Duration.Round(time.Millisecond),
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extra,
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)
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alerting.Handle(service, result)
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if cfg.Debug {
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log.Printf("[watchdog][monitor] Waiting for interval=%s before monitoring serviceName=%s again", service.Interval, service.Name)
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}
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monitoringMutex.Unlock()
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time.Sleep(service.Interval)
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}
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}
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