使用 bitcoinj 獲取餘額/下載區塊鏈

我正在玩 bitoinj，但我似乎連最基本的功能都無法執行。

我想做的事：我有一個錢包和一個地址。我想下載區塊鏈並從中獲取錢包餘額。

我所做的是遵循程式碼（在 scala 中，但它或多或少與 Java 相同），錢包位於address.walet，我希望將 blockain 保存在saved.blockchain：

val params = NetworkParameters.prodNet
val walletFile = new java.io.File("address.wallet");
val wallet = Wallet.loadFromFile(walletFile)

val key = wallet.keychain.get(0)
val address:String = key.toAddress(params).toString
println("ADDRESS IS : "+address)

val blockStore = new BoundedOverheadBlockStore(params, new java.io.File("saved.blockchain"))
val chain = new BlockChain(params, wallet, blockStore)
val peerGroup = new PeerGroup(params, chain)
peerGroup.setUserAgent("BitToy", "0.1")

peerGroup.addPeerDiscovery(new DnsDiscovery(params))
peerGroup.addWallet(wallet)
println("START DOWNLOADING BLOCKCHAIN")

peerGroup.start()
peerGroup.downloadBlockChain()
peerGroup.stop()
println("DONE; BALANCE IS :")
println(wallet.getBalance)

我錢包裡的地址確實有餘額。

現在，當我第一次執行它時，區塊鏈（或者更確切地說，標頭）被下載，我看到了正確的餘額。但是，當我第二次執行它時，我只看到：

ADDRESS IS : [correct address here]
Aug 19, 2012 8:06:00 AM com.google.bitcoin.store.BoundedOverheadBlockStore load
INFO: Reading block store from saved.blockchain
Aug 19, 2012 8:06:00 AM com.google.bitcoin.store.BoundedOverheadBlockStore load
INFO: Read chain head from disk: 00000000000001b10c347b5ec05f9a1910d541905c5cd8827784a5c3e0695c95
Aug 19, 2012 8:06:00 AM com.google.bitcoin.core.BlockChain <init>
INFO: chain head is at height 194575:
v1 block: 
  previous block: 00000000000005ac50dc06021362cd4c284fafd4a1bdb7bad2849c978a875bb1
  merkle root: 158aedd0bc3386c7686f85ab933fd9e3ecb38e348b121ed0e61e2e776eda04a1
  time: [1345356028] Sun Aug 19 08:00:28 CEST 2012
  difficulty target (nBits): 436709470
  nonce: 4238997601

START DOWNLOADING BLOCKCHAIN
Aug 19, 2012 8:06:31 AM com.google.bitcoin.discovery.DnsDiscovery getPeers
INFO: DNS lookup for dnsseed.bitcoin.dashjr.org failed.
Aug 19, 2012 8:06:36 AM com.google.bitcoin.core.TCPNetworkConnection$NetworkHandler channelConnected
INFO: Announcing ourselves as: /BitCoinJ:0.6-SNAPSHOT/BitMessage:0.1/
Aug 19, 2012 8:06:41 AM com.google.bitcoin.core.Peer$PeerHandler exceptionCaught
INFO: com.google.bitcoin.core.Peer$PeerHandler@193f6e2 - No route to host
Aug 19, 2012 8:06:46 AM com.google.bitcoin.core.Peer$PeerHandler exceptionCaught
INFO: com.google.bitcoin.core.Peer$PeerHandler@61736e - No route to host
Aug 19, 2012 8:06:52 AM com.google.bitcoin.core.TCPNetworkConnection$NetworkHandler channelConnected
INFO: Announcing ourselves as: /BitCoinJ:0.6-SNAPSHOT/BitMessage:0.1/
Aug 19, 2012 8:06:52 AM com.google.bitcoin.core.PeerGroup handleNewPeer
INFO: Peer(seed.bitcoin.sipa.be/50.130.4.89:8333): New peer
Aug 19, 2012 8:06:52 AM com.google.bitcoin.core.PeerGroup handleNewPeer
INFO:   starting block chain download
Aug 19, 2012 8:06:52 AM com.google.bitcoin.core.PeerGroup setDownloadPeer
INFO: Setting download peer: Peer(seed.bitcoin.sipa.be/50.130.4.89:8333)
Downloading block chain of size 0. 
Done downloading block chain
Aug 19, 2012 8:06:52 AM com.google.bitcoin.core.Peer blockChainDownload
INFO: Peer(seed.bitcoin.sipa.be/50.130.4.89:8333): blockChainDownload(0000000000000000000000000000000000000000000000000000000000000000) current head = 00000000000001b10c347b5ec05f9a1910d541905c5cd8827784a5c3e0695c95
DONE; BALANCE IS :
0
Aug 19, 2012 8:06:52 AM com.google.bitcoin.core.PeerGroup$PeerGroupThread run
INFO: shutdown start

餘額為零。如果我刪除保存的區塊鏈並讓它重新下載，它會再次工作，但只有一次。

我究竟做錯了什麼？

好的，現在我明白了。

我不能。

Bitcoinj 僅保存標頭。而且 - 我不知道 - 你不能只用標題來平衡。

有關更多資訊，您可以在此處查看標題中的確切描述<https://en.bitcoin.it/wiki/Block_hashing_algorithm>

但是，我能做的就是事後立即保存錢包。我會做的。

---

以前的“答案”/大聲思考：

我在原始碼中四處尋找。

似乎重要的部分是何時sendTransactionsToWallet被呼叫BlockChain.java- 但它只在期間被呼叫connectBlock，沒有別的。

connectBlock僅在 期間呼叫add。唯一的added 塊是來自網路的新塊，而不是來自 BlockStore 的塊。

但我會多看看程式碼。

---

我不確定，如果我重寫BlockChain.javafrom 的建構子會發生什麼可怕的事情：

/**
* Constructs a BlockChain connected to the given list of wallets and a store.
*/
public BlockChain(NetworkParameters params, List<Wallet> wallets,
                 BlockStore blockStore) throws BlockStoreException {
   this.blockStore = blockStore;
   chainHead = blockStore.getChainHead();
   log.info("chain head is at height {}:\n{}", chainHead.getHeight(), chainHead.getHeader());
   this.params = params;
   this.wallets = new ArrayList<Wallet>(wallets);
}

to（從我的腦海中寫作，getter/setter 可能不正確，等等）

/**
* Constructs a BlockChain connected to the given list of wallets and a store.
*/
public BlockChain(NetworkParameters params, List<Wallet> wallets,
                 BlockStore blockStore) throws BlockStoreException {
   this.blockStore = blockStore;
   chainHead = blockStore.getChainHead();
   log.info("chain head is at height {}:\n{}", chainHead.getHeight(), chainHead.getHeader());
   this.params = params;
   this.wallets = new ArrayList<Wallet>(wallets);
   StoredBlock sBlock = blockStore.getChainHead();
   Sha256Hash prevHash = sBlock.header.prevBlockHash();
   while (prevHash!=Sha256Hash.ZERO_HASH) {
       for (Wallet wallet:wallets){
           sendTransactionsToWallet(sBlock, NewBlockType.SIDE_CHAIN, wallet, sBlock.transactions); 
       }
       sBlock = blockStore.get(hash);
       prevHash = sBlock.header.prevBlockHash();
   }
}

但同樣，我不想重新發明輪子或任何東西。

引用自：https://bitcoin.stackexchange.com/questions/4477