istio.io/istio@v0.0.0-20240520182934-d79c90f27776/pilot/pkg/model/disabled_ledger.go (about)

     1  // Copyright Istio Authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package model
    16  
    17  import (
    18  	"errors"
    19  
    20  	"istio.io/istio/pkg/ledger"
    21  )
    22  
    23  // DisabledLedger is an empty mock of the ledger.Ledger interface
    24  // which we will substitute when distribution tracking is disabled.
    25  type DisabledLedger struct {
    26  	ledger.Ledger
    27  }
    28  
    29  func (d *DisabledLedger) Put(key, value string) (string, error) {
    30  	return "", nil
    31  }
    32  
    33  func (d *DisabledLedger) Delete(key string) error {
    34  	return nil
    35  }
    36  
    37  func (d *DisabledLedger) Get(key string) (string, error) {
    38  	return "", nil
    39  }
    40  
    41  func (d *DisabledLedger) RootHash() string {
    42  	return ""
    43  }
    44  
    45  func (d *DisabledLedger) GetPreviousValue(previousHash, key string) (result string, err error) {
    46  	return "", errors.New("distribution tracking is disabled")
    47  }