feat: publish standalone worker

Separate worker packaging and service lifecycle from the control plane.

app/models/selfcheck.go

@@ -0,0 +1,55 @@
+package models
+
+import (
+	"time"
+
+	"github.com/pkg/errors"
+
+	"rsgit.ru/rsmon/rsmon/app/models/concerns"
+)
+
+// SelfCheck provides functionality.
+type SelfCheck struct {
+	concerns.Model
+	Kind      string    `gorm:"not null;uniqueIndex:selfchecks" json:"kind"`
+	Server    *string   `gorm:"uniqueIndex:selfchecks" json:"server"`
+	Info      string    `json:"info"`
+	LastCheck time.Time `json:"created_at"`
+}
+
+// LogCheck provides functionality.
+func LogCheck(kind string) error {
+	m := SelfCheck{
+		Kind:   kind,
+		Server: nil,
+	}
+	DB().FirstOrInit(&m, m)
+
+	m.LastCheck = time.Now()
+
+	return DB().Save(&m).Error
+}
+
+// IsOk checks if the selfcheck for the given kind ran recently.
+func IsOk(kind string) (bool, string, error) {
+	m := SelfCheck{
+		Kind:   kind,
+		Server: nil,
+	}
+	DB().First(&m, m)
+
+	if m.ID == 0 {
+		return false, "", errors.New("not run")
+	}
+
+	var ago time.Time
+	if kind == "exp" {
+		ago = time.Now().Add(-3 * time.Hour)
+	} else {
+		ago = time.Now().Add(-15 * time.Minute)
+	}
+
+	isOk := m.LastCheck.After(ago)
+
+	return isOk, m.LastCheck.Format(time.RFC3339), nil
+}