btcd 提供的 RPC 接口中，獲取區塊和交易詳情接口 GetBlockVerboseTx 存在一個 BUG, 具體可以查看 issue :

getblock 接口詳情如下

getblock "blockhash" ( verbosity )

If verbosity is 0, returns a string that is serialized, hex-encoded data for block 'hash'.

If verbosity is 1, returns an Object with information about block .

If verbosity is 2, returns an Object with information about block and information about each transaction.

Arguments:

1. "blockhash" (string, required) The block hash

2. verbosity (numeric, optional, default=1) 0 for hex encoded data, 1 for a json object, and 2 for json object with transaction data

我沒有在 btcd 提 pull request, 故把修改過的文件提交到這個 repo, 使用 btcd 時直接覆蓋對應文件即可。

修改的代碼

在 btcd 中，獲取區塊和區塊中所有交易詳情的 RPC 方法是：

func (c *Client) GetBlockVerboseTx(blockHash *chainhash.Hash) (*btcjson.GetBlockVerboseResult, error) {

return c.GetBlockVerboseTxAsync(blockHash).Receive()

}

接著我們再看看 GetBlockVerboseTxAsync 方法：

func (c *Client) GetBlockVerboseTxAsync(blockHash *chainhash.Hash) FutureGetBlockVerboseResult {

hash := ""

if blockHash != nil {

hash = blockHash.String()

}

cmd := btcjson.NewGetBlockCmd(hash, btcjson.Bool(true), btcjson.Bool(true))

return c.sendCmd(cmd)

}

其中 NewGetBlockCmd 函數接受三個參數，后面兩個為布爾類型，顯然是不對的，getblock 接口格式為 getblock "blockhash" ( verbosity )

因為我只是做了小修改再加上對 btcd 源碼不怎么熟悉，為了不引入新的 bug ，我在這里只添加代碼，不刪除，不修改 ...

func (c *Client) GetBlockVerboseTxM(blockHash *chainhash.Hash) (*btcjson.GetBlockVerboseResult, error) {

return c.GetBlockVerboseTxAsyncM(blockHash).Receive()

}

...

func (c *Client) GetBlockVerboseTxAsyncM(blockHash *chainhash.Hash) FutureGetBlockVerboseResult {

hash := ""

if blockHash != nil {

hash = blockHash.String()

}

cmd := btcjson.NewGetBlockCmdM(hash, 2)

return c.sendCmd(cmd)

}

在 rpcclient/chain.go 修改，不刪除原來的方法，追加修改的兩個方法。接下來繼續看看 NewGetBlockCmdM 方法，在 btcjson/chainsvrcmds.go 文件中：

func NewGetBlockCmdM(hash string, verbose int) *GetBlockCmdM {

return &GetBlockCmdM{

Hash: hash,

Verbose: &verbose,

}

}

...

// GetBlockCmdM defines the getblock JSON-RPC command.

type GetBlockCmdM struct {

Hash string

Verbose *int `jsonrpcdefault:"1"`

}

...

，通過 getblock "blockhash" 2 在比特幣節點的返回數據中，Unmarshal 后的結構體 GetBlockVerboseResult Tx 字段類型應該改為 TxRawResult，在 btcjson/chainsvrresults.go 文件中:

...

type GetBlockVerboseResult struct {

Hash string `json:"hash"`

Confirmations uint64 `json:"confirmations"`

StrippedSize int32 `json:"strippedsize"`

Size int32 `json:"size"`

Weight int32 `json:"weight"`

Height int64 `json:"height"`

Version int32 `json:"version"`

VersionHex string `json:"versionHex"`

MerkleRoot string `json:"merkleroot"`

Tx []TxRawResult `json:"tx,omitempty"`

RawTx []TxRawResult `json:"rawtx,omitempty"`

Time int64 `json:"time"`

Nonce uint32 `json:"nonce"`

Bits string `json:"bits"`

Difficulty float64 `json:"difficulty"`

PreviousHash string `json:"previousblockhash"`

NextHash string `json:"nextblockhash,omitempty"`

}

最后，在 btcjson/chainsvrcmds.go 文件中修改 getblock 命令和修改后的方法綁定:

MustRegisterCmd("getblock", (*GetBlockCmdM)(nil), flags)

fix verbocity in getblock command for btcd

When i call getblock by btcd rpcclient, the generated rpc command looks like this:

{

"jsonrpc":"1.0",

"method":"getblock",

"params":

["0000000000000000015ed7a2934f8ecb39eda15459376fff64284e1a87688d5d",true,true],

"id":1

}

the right generation sendCmd should look like this:

{

"jsonrpc":"1.0",

"method":"getblock",

"params":["0000000000000000015ed7a2934f8ecb39eda15459376fff64284e1a87688d5d",2],

"id":1

}

Original "getblock" command accept 2 arguments:

blockhash

verbosity (numeric, optional, default=1) 0 for hex encoded data, 1 for a json object, and 2 for json object with transaction data

getblock "blockhash" ( verbosity )

If verbosity is 0, returns a string that is serialized, hex-encoded data for block 'hash'.

If verbosity is 1, returns an Object with information about block .

If verbosity is 2, returns an Object with information about block and information about each transaction.

Arguments:

1. "blockhash" (string, required) The block hash

2. verbosity (numeric, optional, default=1) 0 for hex encoded data, 1 for a json object, and 2 for json object with transaction data

總結

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