[FAB-3673] remove blockhoder interface/struct

This CR removes Blockholder interface/struct and uses common.Block
everywhere in common ledger.

Change-Id: I66de25a603c61c4c8131c6fb53b5545f5717fb4c
Signed-off-by: manish <manish.sethi@gmail.com>

common/ledger/blkstorage/fsblkstorage/blockfile_mgr_test.go

@@ -124,7 +124,7 @@ func testBlockfileMgrBlockIterator(t *testing.T, blockfileMgr *blockfileMgr,
 	for {
 		block, err := itr.Next()
 		testutil.AssertNoError(t, err, fmt.Sprintf("Error while getting block number [%d] from iterator", numBlocksItrated))
-		testutil.AssertEquals(t, block.(*blockHolder).GetBlock(), expectedBlocks[numBlocksItrated])
+		testutil.AssertEquals(t, block, expectedBlocks[numBlocksItrated])
 		numBlocksItrated++
 		if numBlocksItrated == lastBlockNum-firstBlockNum+1 {
 			break

common/ledger/blkstorage/fsblkstorage/blocks_itr.go

@@ -17,33 +17,11 @@ limitations under the License.
 package fsblkstorage
 
 import (
-	"fmt"
 	"sync"
 
 	"github.com/hyperledger/fabric/common/ledger"
-
-	"github.com/hyperledger/fabric/protos/common"
 )
 
-// blockHolder holds block bytes
-type blockHolder struct {
-	blockBytes []byte
-}
-
-// GetBlock serializes Block from block bytes
-func (bh *blockHolder) GetBlock() *common.Block {
-	block, err := deserializeBlock(bh.blockBytes)
-	if err != nil {
-		panic(fmt.Errorf("Problem in deserialzing block: %s", err))
-	}
-	return block
-}
-
-// GetBlockBytes returns block bytes
-func (bh *blockHolder) GetBlockBytes() []byte {
-	return bh.blockBytes
-}
-
 // blocksItr - an iterator for iterating over a sequence of blocks
 type blocksItr struct {
 	mgr                  *blockfileMgr
@@ -108,7 +86,7 @@ func (itr *blocksItr) Next() (ledger.QueryResult, error) {
 		return nil, err
 	}
 	itr.blockNumToRetrieve++
-	return &blockHolder{nextBlockBytes}, nil
+	return deserializeBlock(nextBlockBytes)
 }
 
 // Close releases any resources held by the iterator

common/ledger/blkstorage/fsblkstorage/blocks_itr_test.go

@@ -78,9 +78,9 @@ func testIterateAndVerify(t *testing.T, itr *blocksItr, blocks []*common.Block,
 	blocksIterated := 0
 	for {
 		t.Logf("blocksIterated: %v", blocksIterated)
-		bh, err := itr.Next()
+		block, err := itr.Next()
 		testutil.AssertNoError(t, err, "")
-		testutil.AssertEquals(t, bh.(*blockHolder).GetBlock(), blocks[blocksIterated])
+		testutil.AssertEquals(t, block, blocks[blocksIterated])
 		blocksIterated++
 		if blocksIterated == len(blocks) {
 			break

common/ledger/blkstorage/fsblkstorage/fs_blockstore_provider_test.go

@@ -21,7 +21,6 @@ import (
 
 	"fmt"
 
-	"github.com/hyperledger/fabric/common/ledger"
 	"github.com/hyperledger/fabric/common/ledger/blkstorage"
 	"github.com/hyperledger/fabric/common/ledger/testutil"
 	"github.com/hyperledger/fabric/core/ledger/util"
@@ -63,8 +62,7 @@ func checkBlocks(t *testing.T, expectedBlocks []*common.Block, store blkstorage.
 
 	itr, _ := store.RetrieveBlocks(0)
 	for i := 0; i < len(expectedBlocks); i++ {
-		blockHolder, _ := itr.Next()
-		block := blockHolder.(ledger.BlockHolder).GetBlock()
+		block, _ := itr.Next()
 		testutil.AssertEquals(t, block, expectedBlocks[i])
 	}
 

common/ledger/ledger_interface.go

@@ -49,12 +49,5 @@ type ResultsIterator interface {
 // QueryResult - a general interface for supporting different types of query results. Actual types differ for different queries
 type QueryResult interface{}
 
-// BlockHolder holds block returned by the iterator in GetBlocksIterator.
-// The sole purpose of this holder is to avoid desrialization if block is desired in raw bytes form (e.g., for transfer)
-type BlockHolder interface {
-	GetBlock() *common.Block
-	GetBlockBytes() []byte
-}
-
 // PrunePolicy - a general interface for supporting different pruning policies
 type PrunePolicy interface{}