PoC 6 networking code.

* Added block pool for gathering blocks from the network (chunks)
* Re wrote syncing

ethchain/block_chain.go

@@ -208,6 +208,26 @@ func (bc *BlockChain) GenesisBlock() *Block {
 	return bc.genesisBlock
 }
 
+func (self *BlockChain) GetChainHashesFromHash(hash []byte, max uint64) (chain [][]byte) {
+	block := self.GetBlock(hash)
+	if block == nil {
+		return
+	}
+
+	// XXX Could be optimised by using a different database which only holds hashes (i.e., linked list)
+	for i := uint64(0); i < max; i++ {
+		chain = append(chain, block.Hash())
+
+		if block.Number.Cmp(ethutil.Big0) <= 0 {
+			break
+		}
+
+		block = self.GetBlock(block.PrevHash)
+	}
+
+	return
+}
+
 // Get chain return blocks from hash up to max in RLP format
 func (bc *BlockChain) GetChainFromHash(hash []byte, max uint64) []interface{} {
 	var chain []interface{}

ethchain/genesis.go

@@ -1,9 +1,10 @@
 package ethchain
 
 import (
+	"math/big"
+
 	"github.com/ethereum/eth-go/ethcrypto"
 	"github.com/ethereum/eth-go/ethutil"
-	"math/big"
 )
 
 /*
@@ -26,7 +27,8 @@ var GenesisHeader = []interface{}{
 	// tx sha
 	"",
 	// Difficulty
-	ethutil.BigPow(2, 22),
+	//ethutil.BigPow(2, 22),
+	big.NewInt(4096),
 	// Number
 	ethutil.Big0,
 	// Block minimum gas price