From 46bcd9a92c747bd6f2f6f7377d39f3949469203c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?P=C3=A9ter=20Szil=C3=A1gyi?= <peterke@gmail.com>
Date: Tue, 28 Feb 2017 13:41:02 +0200
Subject: [PATCH] core, eth: drop database block splitting upgrader

---
 core/database_util.go | 18 -------------
 eth/backend.go        |  3 ---
 eth/db_upgrade.go     | 59 -------------------------------------------
 3 files changed, 80 deletions(-)

diff --git a/core/database_util.go b/core/database_util.go
index 23240b35e4..68263f8d82 100644
--- a/core/database_util.go
+++ b/core/database_util.go
@@ -539,24 +539,6 @@ func DeleteReceipt(db ethdb.Database, hash common.Hash) {
 	db.Delete(append(receiptsPrefix, hash.Bytes()...))
 }
 
-// [deprecated by the header/block split, remove eventually]
-// GetBlockByHashOld returns the old combined block corresponding to the hash
-// or nil if not found. This method is only used by the upgrade mechanism to
-// access the old combined block representation. It will be dropped after the
-// network transitions to eth/63.
-func GetBlockByHashOld(db ethdb.Database, hash common.Hash) *types.Block {
-	data, _ := db.Get(append(oldBlockHashPrefix, hash[:]...))
-	if len(data) == 0 {
-		return nil
-	}
-	var block types.StorageBlock
-	if err := rlp.Decode(bytes.NewReader(data), &block); err != nil {
-		log.Error(fmt.Sprintf("invalid block RLP for hash %x: %v", hash, err))
-		return nil
-	}
-	return (*types.Block)(&block)
-}
-
 // returns a formatted MIP mapped key by adding prefix, canonical number and level
 //
 // ex. fn(98, 1000) = (prefix || 1000 || 0)
diff --git a/eth/backend.go b/eth/backend.go
index f20e4a5099..c288b25573 100644
--- a/eth/backend.go
+++ b/eth/backend.go
@@ -176,9 +176,6 @@ func New(ctx *node.ServiceContext, config *Config) (*Ethereum, error) {
 		solcPath:       config.SolcPath,
 	}
 
-	if err := upgradeChainDatabase(chainDb); err != nil {
-		return nil, err
-	}
 	if err := addMipmapBloomBins(chainDb); err != nil {
 		return nil, err
 	}
diff --git a/eth/db_upgrade.go b/eth/db_upgrade.go
index 7038ebbbdf..2a61af364c 100644
--- a/eth/db_upgrade.go
+++ b/eth/db_upgrade.go
@@ -252,65 +252,6 @@ func upgradeSequentialBlockData(db ethdb.Database, hash []byte) error {
 	return nil
 }
 
-// upgradeChainDatabase ensures that the chain database stores block split into
-// separate header and body entries.
-func upgradeChainDatabase(db ethdb.Database) error {
-	// Short circuit if the head block is stored already as separate header and body
-	data, err := db.Get([]byte("LastBlock"))
-	if err != nil {
-		return nil
-	}
-	head := common.BytesToHash(data)
-
-	if block := core.GetBlockByHashOld(db, head); block == nil {
-		return nil
-	}
-	// At least some of the database is still the old format, upgrade (skip the head block!)
-	log.Info(fmt.Sprint("Old database detected, upgrading..."))
-
-	if db, ok := db.(*ethdb.LDBDatabase); ok {
-		blockPrefix := []byte("block-hash-")
-		for it := db.NewIterator(); it.Next(); {
-			// Skip anything other than a combined block
-			if !bytes.HasPrefix(it.Key(), blockPrefix) {
-				continue
-			}
-			// Skip the head block (merge last to signal upgrade completion)
-			if bytes.HasSuffix(it.Key(), head.Bytes()) {
-				continue
-			}
-			// Load the block, split and serialize (order!)
-			block := core.GetBlockByHashOld(db, common.BytesToHash(bytes.TrimPrefix(it.Key(), blockPrefix)))
-
-			if err := core.WriteTd(db, block.Hash(), block.NumberU64(), block.DeprecatedTd()); err != nil {
-				return err
-			}
-			if err := core.WriteBody(db, block.Hash(), block.NumberU64(), block.Body()); err != nil {
-				return err
-			}
-			if err := core.WriteHeader(db, block.Header()); err != nil {
-				return err
-			}
-			if err := db.Delete(it.Key()); err != nil {
-				return err
-			}
-		}
-		// Lastly, upgrade the head block, disabling the upgrade mechanism
-		current := core.GetBlockByHashOld(db, head)
-
-		if err := core.WriteTd(db, current.Hash(), current.NumberU64(), current.DeprecatedTd()); err != nil {
-			return err
-		}
-		if err := core.WriteBody(db, current.Hash(), current.NumberU64(), current.Body()); err != nil {
-			return err
-		}
-		if err := core.WriteHeader(db, current.Header()); err != nil {
-			return err
-		}
-	}
-	return nil
-}
-
 func addMipmapBloomBins(db ethdb.Database) (err error) {
 	const mipmapVersion uint = 2