[Blockchain] Simplify block verification (#544)

* Add the initial block verification separation

* Separate out consensus and other module verification methods

* Add better naming to block verification methods

* Standardize block result errors

* Add receipts extraction

* Add additional documentation for the usage of the receipts cache

* Add delegators for testing the blockchain module

* Add mock support for the blockchain and storage modules

* Add coverage tests

* Simplify the gas verification

* Rearrange code blocks

* Rename some helper methods to be more clear

* Make the mock testing structure public, refactor a simple test

* Remove redundant comment

* Simplify the error variable in initCaches

* Eliminate magic numbers

* Rearrange the checks in VerifySealedBlock

* Remove reference block type when verifying

* Add explainer for WriteBlock

* Verify the header seals before inserting the block

* Rename interface methods to be more implementation agnostic

archive/restore.go

@@ -19,6 +19,7 @@ type blockchainInterface interface {
 	GetBlockByNumber(uint64, bool) (*types.Block, bool)
 	GetHashByNumber(uint64) types.Hash
 	WriteBlock(*types.Block) error
+	VerifyFinalizedBlock(*types.Block) error
 }
 
 // RestoreChain reads blocks from the archive and write to the chain
@@ -73,6 +74,10 @@ func importBlocks(chain blockchainInterface, blockStream *blockStream, progressi
 	nextBlock := firstBlock
 
 	for {
+		if err := chain.VerifyFinalizedBlock(nextBlock); err != nil {
+			return err
+		}
+
 		if err := chain.WriteBlock(nextBlock); err != nil {
 			return err
 		}

archive/restore_test.go

@@ -56,6 +56,10 @@ func (m *mockChain) WriteBlock(block *types.Block) error {
 	return nil
 }
 
+func (m *mockChain) VerifyFinalizedBlock(block *types.Block) error {
+	return nil
+}
+
 func (m *mockChain) SubscribeEvents() blockchain.Subscription {
 	return protocol.NewMockSubscription()
 }