package checker

import (
    "errors"
    "time"

    apb "google3/google/protobuf/any_go_proto"
    "google3/net/proto2/go/ptypes"
)

type CASChecker struct{}

func (casChecker *CASChecker) Check(any *apb.Any) (HealthState, error) {
    var casCheckerReq CASCheckerRequest
    if err := ptypes.UnmarshalAny(any, casCheckerReq); err != nil {
        return "", errors.New("CASChecker: Check received message is not of CASCheckerRequest proto type message")
    }
    // send a request to CAS
}

func (casChecker *CASChecker) Validate(any *apb.Any) bool {
    var casCheckerReq CASCheckerRequest
    if err := ptypes.UnmarshalAny(any, casCheckerReq); err != nil {
        return false
    }
    if err := casChecker.Check(any); err != nil {
        return false
    }
    casCheckerReq.SetArrivedAt(time.Now())
    return true
}