move eval_conditions to API models package (#51447)

pkg/services/ngalert/api/tooling/definitions/eval_condition.go

@@ -0,0 +1,37 @@
+package definitions
+
+import (
+	"encoding/json"
+	"fmt"
+	"time"
+
+	"github.com/grafana/grafana/pkg/services/ngalert/models"
+)
+
+// EvalAlertConditionCommand is the command for evaluating a condition
+type EvalAlertConditionCommand struct {
+	Condition string              `json:"condition"`
+	Data      []models.AlertQuery `json:"data"` // TODO yuri. Create API model for AlertQuery
+	Now       time.Time           `json:"now"`
+}
+
+func (cmd *EvalAlertConditionCommand) UnmarshalJSON(b []byte) error {
+	type plain EvalAlertConditionCommand
+	if err := json.Unmarshal(b, (*plain)(cmd)); err != nil {
+		return err
+	}
+
+	return cmd.validate()
+}
+
+func (cmd *EvalAlertConditionCommand) validate() error {
+	if cmd.Condition == "" {
+		return fmt.Errorf("missing condition")
+	}
+
+	if len(cmd.Data) == 0 {
+		return fmt.Errorf("missing data")
+	}
+
+	return nil
+}