convert `indexAuthMethod` index to use `indexerSingle` (#11014)

* convert `Roles` index to use `indexerSingle`

* fix oss build

* split authmethod write indexer to oss and ent

* add auth method unit tests

agent/consul/state/acl_oss.go

@@ -4,6 +4,7 @@ package state
 
 import (
 	"fmt"
+	"strings"
 
 	memdb "github.com/hashicorp/go-memdb"
 
@@ -94,7 +95,7 @@ func aclTokenListByRole(tx ReadTxn, role string, _ *structs.EnterpriseMeta) (mem
 }
 
 func aclTokenListByAuthMethod(tx ReadTxn, authMethod string, _, _ *structs.EnterpriseMeta) (memdb.ResultIterator, error) {
-	return tx.Get(tableACLTokens, "authmethod", authMethod)
+	return tx.Get(tableACLTokens, indexAuthMethod, AuthMethodQuery{Value: authMethod})
 }
 
 func aclTokenDeleteWithToken(tx WriteTxn, token *structs.ACLToken, idx uint64) error {
@@ -273,3 +274,19 @@ func aclAuthMethodUpsertValidateEnterprise(_ ReadTxn, method *structs.ACLAuthMet
 func (s *Store) ACLAuthMethodUpsertValidateEnterprise(method *structs.ACLAuthMethod, existing *structs.ACLAuthMethod) error {
 	return nil
 }
+
+func indexAuthMethodFromACLToken(raw interface{}) ([]byte, error) {
+	p, ok := raw.(*structs.ACLToken)
+	if !ok {
+		return nil, fmt.Errorf("unexpected type %T for structs.ACLToken index", raw)
+	}
+
+	if p.AuthMethod == "" {
+		return nil, errMissingValueForIndex
+	}
+
+	var b indexBuilder
+	b.String(strings.ToLower(p.AuthMethod))
+
+	return b.Bytes(), nil
+}

agent/consul/state/acl_oss_test.go

@@ -49,6 +49,7 @@ func testIndexerTableACLTokens() map[string]indexerTestCase {
 		Roles: []structs.ACLTokenRoleLink{
 			{ID: roleID1}, {ID: roleID2},
 		},
+		AuthMethod: "test-Auth-Method",
 	}
 	encodedPID1 := []byte{0x12, 0x3e, 0x45, 0x67, 0xe8, 0x9a, 0x12, 0xd7, 0xa4, 0x56, 0x42, 0x66, 0x14, 0x17, 0x40, 0x01}
 	encodedPID2 := []byte{0x12, 0x3e, 0x45, 0x67, 0xe8, 0x9a, 0x12, 0xd7, 0xa4, 0x56, 0x42, 0x66, 0x14, 0x17, 0x40, 0x02}
@@ -79,6 +80,18 @@ func testIndexerTableACLTokens() map[string]indexerTestCase {
 				expected: [][]byte{encodedRID1, encodedRID2},
 			},
 		},
+		indexAuthMethod: {
+			read: indexValue{
+				source: AuthMethodQuery{
+					Value: "test-Auth-Method",
+				},
+				expected: []byte("test-auth-method\x00"),
+			},
+			write: indexValue{
+				source:   obj,
+				expected: []byte("test-auth-method\x00"),
+			},
+		},
 	}
 }
 

agent/consul/state/acl_schema.go

@@ -70,9 +70,9 @@ func tokensTableSchema() *memdb.TableSchema {
 				Name:         indexAuthMethod,
 				AllowMissing: true,
 				Unique:       false,
-				Indexer: &memdb.StringFieldIndex{
+				Indexer: indexerSingle{
-					Field:     "AuthMethod",
+					readIndex:  readIndex(indexFromAuthMethodQuery),
-					Lowercase: false,
+					writeIndex: writeIndex(indexAuthMethodFromACLToken),
 				},
 			},
 			indexLocal: {

agent/consul/state/query.go

@@ -128,3 +128,21 @@ func indexFromKeyValueQuery(arg interface{}) ([]byte, error) {
 	b.String(q.Value)
 	return b.Bytes(), nil
 }
+
+type AuthMethodQuery struct {
+	Value             string
+	AuthMethodEntMeta structs.EnterpriseMeta
+	structs.EnterpriseMeta
+}
+
+// NamespaceOrDefault exists because structs.EnterpriseMeta uses a pointer
+// receiver for this method. Remove once that is fixed.
+func (q AuthMethodQuery) NamespaceOrDefault() string {
+	return q.EnterpriseMeta.NamespaceOrDefault()
+}
+
+// PartitionOrDefault exists because structs.EnterpriseMeta uses a pointer
+// receiver for this method. Remove once that is fixed.
+func (q AuthMethodQuery) PartitionOrDefault() string {
+	return q.EnterpriseMeta.PartitionOrDefault()
+}

agent/consul/state/query_oss.go

@@ -42,3 +42,16 @@ func prefixIndexFromServiceNameAsString(arg interface{}) ([]byte, error) {
 
 	return nil, fmt.Errorf("unexpected type %T for Query prefix index", arg)
 }
+
+// indexFromAuthMethodQuery builds an index key where Query.Value is lowercase, and is
+// a required value.
+func indexFromAuthMethodQuery(arg interface{}) ([]byte, error) {
+	q, ok := arg.(AuthMethodQuery)
+	if !ok {
+		return nil, fmt.Errorf("unexpected type %T for Query index", arg)
+	}
+
+	var b indexBuilder
+	b.String(strings.ToLower(q.Value))
+	return b.Bytes(), nil
+}