open-consul/agent/consul/state/acl_events.go

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package state
import (
"github.com/hashicorp/consul/agent/consul/stream"
"github.com/hashicorp/consul/agent/structs"
memdb "github.com/hashicorp/go-memdb"
)
// aclChangeUnsubscribeEvent creates and returns stream.UnsubscribeEvents that
// are used to unsubscribe any subscriptions which match the tokens from the events.
//
// These are special events that will never be returned to a subscriber.
func aclChangeUnsubscribeEvent(tx ReadTxn, changes Changes) ([]stream.Event, error) {
var secretIDs []string
for _, change := range changes.Changes {
switch change.Table {
case "acl-tokens":
token := changeObject(change).(*structs.ACLToken)
secretIDs = append(secretIDs, token.SecretID)
case "acl-roles":
role := changeObject(change).(*structs.ACLRole)
tokens, err := aclTokenListByRole(tx, role.ID, &role.EnterpriseMeta)
if err != nil {
return nil, err
}
secretIDs = appendSecretIDsFromTokenIterator(secretIDs, tokens)
case "acl-policies":
policy := changeObject(change).(*structs.ACLPolicy)
tokens, err := aclTokenListByPolicy(tx, policy.ID, &policy.EnterpriseMeta)
if err != nil {
return nil, err
}
secretIDs = appendSecretIDsFromTokenIterator(secretIDs, tokens)
roles, err := aclRoleListByPolicy(tx, policy.ID, &policy.EnterpriseMeta)
if err != nil {
return nil, err
}
for role := roles.Next(); role != nil; role = roles.Next() {
role := role.(*structs.ACLRole)
tokens, err := aclTokenListByRole(tx, role.ID, &policy.EnterpriseMeta)
if err != nil {
return nil, err
}
secretIDs = appendSecretIDsFromTokenIterator(secretIDs, tokens)
}
}
}
// There may be duplicate secretIDs here. We rely on this event allowing
// for duplicate IDs.
return []stream.Event{stream.NewCloseSubscriptionEvent(secretIDs)}, nil
}
// changeObject returns the object before it was deleted if the change was a delete,
// otherwise returns the object after the change.
func changeObject(change memdb.Change) interface{} {
if change.Deleted() {
return change.Before
}
return change.After
}
func appendSecretIDsFromTokenIterator(seq []string, tokens memdb.ResultIterator) []string {
for token := tokens.Next(); token != nil; token = tokens.Next() {
token := token.(*structs.ACLToken)
seq = append(seq, token.SecretID)
}
return seq
}