From 4503a61997aadaefa4bb3988b5d3cf42b53d95ff Mon Sep 17 00:00:00 2001
From: Dmitrii Stepanov <d.stepanov@yadro.com>
Date: Thu, 18 May 2023 15:38:41 +0300
Subject: [PATCH] [#312] wc: Delete unused Iterate method

Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>
---
 .../writecache/iterate.go                     | 54 -------------------
 .../writecache/writecache.go                  |  1 -
 2 files changed, 55 deletions(-)

diff --git a/pkg/local_object_storage/writecache/iterate.go b/pkg/local_object_storage/writecache/iterate.go
index ebe979520..59ace93bd 100644
--- a/pkg/local_object_storage/writecache/iterate.go
+++ b/pkg/local_object_storage/writecache/iterate.go
@@ -4,7 +4,6 @@ import (
 	"errors"
 	"fmt"
 
-	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/common"
 	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
 	"go.etcd.io/bbolt"
 )
@@ -12,59 +11,6 @@ import (
 // ErrNoDefaultBucket is returned by IterateDB when default bucket for objects is missing.
 var ErrNoDefaultBucket = errors.New("no default bucket")
 
-// IterationPrm contains iteration parameters.
-type IterationPrm struct {
-	handler      func([]byte) error
-	ignoreErrors bool
-}
-
-// WithHandler sets a callback to be executed on every object.
-func (p *IterationPrm) WithHandler(f func([]byte) error) {
-	p.handler = f
-}
-
-// WithIgnoreErrors sets a flag indicating that errors should be ignored.
-func (p *IterationPrm) WithIgnoreErrors(ignore bool) {
-	p.ignoreErrors = ignore
-}
-
-// Iterate iterates over all objects present in write cache.
-// This is very difficult to do correctly unless write-cache is put in read-only mode.
-// Thus we silently fail if shard is not in read-only mode to avoid reporting misleading results.
-func (c *cache) Iterate(prm IterationPrm) error {
-	c.modeMtx.RLock()
-	defer c.modeMtx.RUnlock()
-	if !c.readOnly() {
-		return nil
-	}
-
-	err := c.db.View(func(tx *bbolt.Tx) error {
-		b := tx.Bucket(defaultBucket)
-		return b.ForEach(func(k, data []byte) error {
-			return prm.handler(data)
-		})
-	})
-	if err != nil {
-		return err
-	}
-
-	var fsPrm common.IteratePrm
-	fsPrm.IgnoreErrors = prm.ignoreErrors
-	fsPrm.LazyHandler = func(addr oid.Address, f func() ([]byte, error)) error {
-		data, err := f()
-		if err != nil {
-			if prm.ignoreErrors {
-				return nil
-			}
-			return err
-		}
-		return prm.handler(data)
-	}
-
-	_, err = c.fsTree.Iterate(fsPrm)
-	return err
-}
-
 // IterateDB iterates over all objects stored in bbolt.DB instance and passes them to f until error return.
 // It is assumed that db is an underlying database of some WriteCache instance.
 //
diff --git a/pkg/local_object_storage/writecache/writecache.go b/pkg/local_object_storage/writecache/writecache.go
index 83ecf219c..0edf4b9be 100644
--- a/pkg/local_object_storage/writecache/writecache.go
+++ b/pkg/local_object_storage/writecache/writecache.go
@@ -32,7 +32,6 @@ type Cache interface {
 	// Returns apistatus.ObjectNotFound if object is missing in the Cache.
 	// Returns ErrReadOnly if the Cache is currently in the read-only mode.
 	Delete(context.Context, oid.Address) error
-	Iterate(IterationPrm) error
 	Put(context.Context, common.PutPrm) (common.PutRes, error)
 	SetMode(mode.Mode) error
 	SetLogger(*logger.Logger)