chrly/eventsubscribers/health_checkers.go

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package eventsubscribers
import (
"context"
"errors"
"sync"
"time"
"github.com/etherlabsio/healthcheck"
"github.com/elyby/chrly/api/mojang"
)
type Pingable interface {
Ping() error
}
func DatabaseChecker(connection Pingable) healthcheck.CheckerFunc {
return func(ctx context.Context) error {
done := make(chan error)
go func() {
done <- connection.Ping()
}()
select {
case <-ctx.Done():
return errors.New("check timeout")
case err := <-done:
return err
}
}
}
func MojangBatchUuidsProviderResponseChecker(dispatcher Subscriber, resetDuration time.Duration) healthcheck.CheckerFunc {
errHolder := &expiringErrHolder{D: resetDuration}
dispatcher.Subscribe(
"mojang_textures:batch_uuids_provider:result",
func(usernames []string, profiles []*mojang.ProfileInfo, err error) {
errHolder.Set(err)
},
)
return func(ctx context.Context) error {
return errHolder.Get()
}
}
func MojangBatchUuidsProviderQueueLengthChecker(dispatcher Subscriber, maxLength int) healthcheck.CheckerFunc {
var mutex sync.Mutex
queueLength := 0
dispatcher.Subscribe("mojang_textures:batch_uuids_provider:round", func(usernames []string, tasksInQueue int) {
mutex.Lock()
queueLength = tasksInQueue
mutex.Unlock()
})
return func(ctx context.Context) error {
mutex.Lock()
defer mutex.Unlock()
if queueLength < maxLength {
return nil
}
return errors.New("the maximum number of tasks in the queue has been exceeded")
}
}
func MojangApiTexturesProviderResponseChecker(dispatcher Subscriber, resetDuration time.Duration) healthcheck.CheckerFunc {
errHolder := &expiringErrHolder{D: resetDuration}
dispatcher.Subscribe(
"mojang_textures:mojang_api_textures_provider:after_request",
func(uuid string, profile *mojang.SignedTexturesResponse, err error) {
errHolder.Set(err)
},
)
return func(ctx context.Context) error {
return errHolder.Get()
}
}
type expiringErrHolder struct {
D time.Duration
err error
l sync.Mutex
t *time.Timer
}
func (h *expiringErrHolder) Get() error {
h.l.Lock()
defer h.l.Unlock()
return h.err
}
func (h *expiringErrHolder) Set(err error) {
h.l.Lock()
defer h.l.Unlock()
if h.t != nil {
h.t.Stop()
h.t = nil
}
h.err = err
if err != nil {
h.t = time.AfterFunc(h.D, func() {
h.Set(nil)
})
}
}