getbestblockhash：获得节点的最高区块的hash
命令执行结果：
admin07@admin-MS:~/job/github_source/bitcoin$ bitcoin-cli -regtest getbestblockhash
10f21e2d0f18fe1be18350b393bbabf108a2197ec35b53916163fa8d9991c972
实现源码：
src/rpc/blockchain.cpp
static UniValue getbestblockhash(const JSONRPCRequest& request)
{
if (request.fHelp || request.params.size() != 0)
throw std::runtime_error(
"getbestblockhash\n"
"\nReturns the hash of the best (tip) block in the longest blockchain.\n"
"\nResult:\n"
"\"hex\" (string) the block hash hex encoded\n"
"\nExamples:\n"
+ HelpExampleCli("getbestblockhash", "")
+ HelpExampleRpc("getbestblockhash", "")
);
LOCK(cs_main);
return chainActive.Tip()->GetBlockHash().GetHex(); //获取vector的最后一个元素的hash
}
src/chain.h
//最后一个CBlockIndex
/** Returns the index entry for the tip(末梢) of this chain, or nullptr if none. */
CBlockIndex *Tip() const {
return vChain.size() > 0 ? vChain[vChain.size() - 1] : nullptr;
}
