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Fix getchaintxstats()

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1. Calculate nblocks more adaptive.
   If not specify nblocks-parameter, illegal parameter error
   will happen when target block height is below blocks for 1 month.
   To avoid this error, set default nblocks to
   min(blocks for 1 month, target block's height - 1)
   And allowing 0 so that this RPC works good even if target block is
   genesis block or 1st block.
2. Correct error message.
   nblocks accepts [0 .. block's height -1] . so fix as following:
   "Invalid block count: should be between 0 and the block's height - 1"
3. Add check 0-divide.
   If nTimeDiff = 0 then returns {... "txrate":} and
   bitcoin-cli cannot handle the response.
   To avoid this error, do not return "txrate" if nTimeDiff = 0.
4. Add following 3 elements to the return object.
   1) 'window_block_count' : Size of the window in number of blocks.
   2) 'window_tx_count' : The number of transactions in the window.
   3) 'window_interval' : The elapsed time in the window.
   They clarify how 'txrate' is calculated. 2) and 3) are returned
   only if 'window_block_count' is a positive value.
5. Improve help text for 'time' as following.
   'The timestamp for the final block in the window in UNIX format.
This commit is contained in:
Akio Nakamura 2017-08-10 16:53:59 +09:00
parent 2c9f5ecf3f
commit 33366768af
1 changed files with 22 additions and 10 deletions
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28
src/rpc/blockchain.cpp
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@ -1477,9 +1477,12 @@ UniValue getchaintxstats(const JSONRPCRequest& request)
"2. \"blockhash\" (string, optional) The hash of the block that ends the window.\n"
"\nResult:\n"
"{\n"
" \"time\": xxxxx, (numeric) The timestamp for the statistics in UNIX format.\n"
" \"time\": xxxxx, (numeric) The timestamp for the final block in the window in UNIX format.\n"
" \"txcount\": xxxxx, (numeric) The total number of transactions in the chain up to that point.\n"
" \"txrate\": x.xx, (numeric) The average rate of transactions per second in the window.\n"
" \"window_block_count\": xxxxx, (numeric) Size of the window in number of blocks.\n"
" \"window_tx_count\": xxxxx, (numeric) The number of transactions in the window. Only returned if \"window_block_count\" is > 0.\n"
" \"window_interval\": xxxxx, (numeric) The elapsed time in the window in seconds. Only returned if \"window_block_count\" is > 0.\n"
" \"txrate\": x.xx, (numeric) The average rate of transactions per second in the window. Only returned if \"window_interval\" is > 0.\n"
"}\n"
"\nExamples:\n"
+ HelpExampleCli("getchaintxstats", "")
@ -1489,10 +1492,6 @@ UniValue getchaintxstats(const JSONRPCRequest& request)
const CBlockIndex* pindex;
int blockcount = 30 * 24 * 60 * 60 / Params().GetConsensus().nPowTargetSpacing; // By default: 1 month
if (!request.params[0].isNull()) {
blockcount = request.params[0].get_int();
}
bool havehash = !request.params[1].isNull();
uint256 hash;
if (havehash) {
@ -1515,8 +1514,14 @@ UniValue getchaintxstats(const JSONRPCRequest& request)
}
}
if (blockcount < 1 || blockcount >= pindex->nHeight) {
throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid block count: should be between 1 and the block's height");
if (request.params[0].isNull()) {
blockcount = std::max(0, std::min(blockcount, pindex->nHeight - 1));
} else {
blockcount = request.params[0].get_int();
if (blockcount < 0 || (blockcount > 0 && blockcount >= pindex->nHeight)) {
throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid block count: should be between 0 and the block's height - 1");
}
}
const CBlockIndex* pindexPast = pindex->GetAncestor(pindex->nHeight - blockcount);
@ -1526,7 +1531,14 @@ UniValue getchaintxstats(const JSONRPCRequest& request)
UniValue ret(UniValue::VOBJ);
ret.push_back(Pair("time", (int64_t)pindex->nTime));
ret.push_back(Pair("txcount", (int64_t)pindex->nChainTx));
ret.push_back(Pair("window_block_count", blockcount));
if (blockcount > 0) {
ret.push_back(Pair("window_tx_count", nTxDiff));
ret.push_back(Pair("window_interval", nTimeDiff));
if (nTimeDiff > 0) {
ret.push_back(Pair("txrate", ((double)nTxDiff) / nTimeDiff));
}
}
return ret;
}