From 1ee03b33d1cf6beb509aa0e9ad45139b05ccd922 Mon Sep 17 00:00:00 2001
From: Manish Sethi <manish.sethi@gmail.com>
Date: Tue, 29 Jun 2021 02:27:42 -0400
Subject: [PATCH] Add function to delete the ledger data for a channel (#2722)

Signed-off-by: manish <manish.sethi@gmail.com>
---
 core/ledger/kvledger/unjoin_channel.go | 135 +++++++++++++++++++++++++
 1 file changed, 135 insertions(+)
 create mode 100644 core/ledger/kvledger/unjoin_channel.go

diff --git a/core/ledger/kvledger/unjoin_channel.go b/core/ledger/kvledger/unjoin_channel.go
new file mode 100644
index 00000000000..6872c514aa3
--- /dev/null
+++ b/core/ledger/kvledger/unjoin_channel.go
@@ -0,0 +1,135 @@
+/*
+Copyright IBM Corp. All Rights Reserved.
+
+SPDX-License-Identifier: Apache-2.0
+*/
+
+package kvledger
+
+import (
+	"github.com/hyperledger/fabric-lib-go/healthz"
+	"github.com/hyperledger/fabric-protos-go/ledger/rwset/kvrwset"
+	"github.com/hyperledger/fabric-protos-go/peer"
+	"github.com/hyperledger/fabric/common/ledger/blkstorage"
+	"github.com/hyperledger/fabric/common/metrics/disabled"
+	"github.com/hyperledger/fabric/core/ledger"
+	"github.com/hyperledger/fabric/core/ledger/confighistory"
+	"github.com/hyperledger/fabric/core/ledger/kvledger/bookkeeping"
+	"github.com/hyperledger/fabric/core/ledger/kvledger/history"
+	"github.com/hyperledger/fabric/core/ledger/kvledger/txmgmt/privacyenabledstate"
+	"github.com/hyperledger/fabric/core/ledger/pvtdatastorage"
+)
+
+// removeLedgerData removes the data for a given ledger. This function should be invoked when the peer is not running and the caller should hold the file lock for the KVLedgerProvider
+func removeLedgerData(config *ledger.Config, ledgerID string) error {
+	blkStoreProvider, err := blkstorage.NewProvider(
+		blkstorage.NewConf(
+			BlockStorePath(config.RootFSPath),
+			maxBlockFileSize,
+		),
+		&blkstorage.IndexConfig{AttrsToIndex: attrsToIndex},
+		&disabled.Provider{},
+	)
+	if err != nil {
+		return err
+	}
+	defer blkStoreProvider.Close()
+
+	bookkeepingProvider, err := bookkeeping.NewProvider(BookkeeperDBPath(config.RootFSPath))
+	if err != nil {
+		return err
+	}
+
+	dbProvider, err := privacyenabledstate.NewDBProvider(
+		bookkeepingProvider,
+		&disabled.Provider{},
+		&noopHealthCheckRegistry{},
+		&privacyenabledstate.StateDBConfig{
+			StateDBConfig: config.StateDBConfig,
+			LevelDBPath:   StateDBPath(config.RootFSPath),
+		},
+		[]string{},
+	)
+	if err != nil {
+		return err
+	}
+	defer dbProvider.Close()
+
+	pvtdataStoreProvider, err := pvtdatastorage.NewProvider(
+		&pvtdatastorage.PrivateDataConfig{
+			PrivateDataConfig: config.PrivateDataConfig,
+			StorePath:         PvtDataStorePath(config.RootFSPath),
+		},
+	)
+	if err != nil {
+		return err
+	}
+	defer pvtdataStoreProvider.Close()
+
+	historydbProvider, err := history.NewDBProvider(
+		HistoryDBPath(config.RootFSPath),
+	)
+	if err != nil {
+		return err
+	}
+	defer historydbProvider.Close()
+
+	configHistoryMgr, err := confighistory.NewMgr(
+		ConfigHistoryDBPath(config.RootFSPath),
+		&noopDeployedChaincodeInfoProvider{},
+	)
+	if err != nil {
+		return err
+	}
+	defer configHistoryMgr.Close()
+
+	ledgerDataRemover := &ledgerDataRemover{
+		blkStoreProvider:     blkStoreProvider,
+		statedbProvider:      dbProvider,
+		bookkeepingProvider:  bookkeepingProvider,
+		configHistoryMgr:     configHistoryMgr,
+		historydbProvider:    historydbProvider,
+		pvtdataStoreProvider: pvtdataStoreProvider,
+	}
+	return ledgerDataRemover.Drop(ledgerID)
+}
+
+type noopHealthCheckRegistry struct{}
+
+func (n *noopHealthCheckRegistry) RegisterChecker(string, healthz.HealthChecker) error {
+	return nil
+}
+
+type noopDeployedChaincodeInfoProvider struct{}
+
+func (n *noopDeployedChaincodeInfoProvider) Namespaces() []string {
+	return nil
+}
+
+func (n *noopDeployedChaincodeInfoProvider) UpdatedChaincodes(stateUpdates map[string][]*kvrwset.KVWrite) ([]*ledger.ChaincodeLifecycleInfo, error) {
+	return nil, nil
+}
+
+func (n *noopDeployedChaincodeInfoProvider) ChaincodeInfo(channelName, chaincodeName string, qe ledger.SimpleQueryExecutor) (*ledger.DeployedChaincodeInfo, error) {
+	return nil, nil
+}
+
+func (n *noopDeployedChaincodeInfoProvider) AllChaincodesInfo(channelName string, qe ledger.SimpleQueryExecutor) (map[string]*ledger.DeployedChaincodeInfo, error) {
+	return nil, nil
+}
+
+func (n *noopDeployedChaincodeInfoProvider) CollectionInfo(channelName, chaincodeName, collectionName string, qe ledger.SimpleQueryExecutor) (*peer.StaticCollectionConfig, error) {
+	return nil, nil
+}
+
+func (n *noopDeployedChaincodeInfoProvider) ImplicitCollections(channelName, chaincodeName string, qe ledger.SimpleQueryExecutor) ([]*peer.StaticCollectionConfig, error) {
+	return nil, nil
+}
+
+func (n *noopDeployedChaincodeInfoProvider) GenerateImplicitCollectionForOrg(mspid string) *peer.StaticCollectionConfig {
+	return nil
+}
+
+func (n *noopDeployedChaincodeInfoProvider) AllCollectionsConfigPkg(channelName, chaincodeName string, qe ledger.SimpleQueryExecutor) (*peer.CollectionConfigPackage, error) {
+	return nil, nil
+}