a595011f5a
7d263571bee8c36fbe3c854b69c6f31cf1ee3b9b rpc: require second argument only for scantxoutset start action (Andrew Chow) Pull request description: It was reported on [IRC](http://www.erisian.com.au/bitcoin-core-dev/log-2019-12-11.html#l-377) that `scantxoutset`'s API was broken in 0.19.0: ``` <belcher> i think scantxoutset may have been broken in bitcoin core 0.19 ? regardless of what parameters i run it with (e.g. "scantxoutset abort", "scantxoutset status") it just returns the help doc, according to the release notes the only change was https://github.com/bitcoin/bitcoin/pull/16285/files but i dont see anything that wouldve broken it, it works fine in 0.18 <belcher> im on regtest, in case its important <harding> I can confirm `scantxoutset abort` returns the help doc on latest master. Waiting for 0.18.1 to start now to attempt to reproduce there. <harding> It looks like it's expecting a second parameter (even though that doesn't make sense with "abort"). <jonatack> Same for me as well <harding> Can also confirm that `scantxoutset abort` returns the expected result on 0.18.1. ``` As noted in the conversation, previously, the second argument of `scanobjects` is only required for the `start` action. `Stop` and `abort` actions did not and could work without them. It appears that this was broken by #16240 which enforced the size of the arguments to match the listed required arguments. To fix this issue, this PR makes the `scanobjects` argument an optional argument. Then only in the `start` action do we check whether the `scanobjects` argument is there and throw an informative error about that. Also a test is added for this case. ACKs for top commit: laanwj: ACK 7d263571bee8c36fbe3c854b69c6f31cf1ee3b9b promag: ACK 7d263571bee8c36fbe3c854b69c6f31cf1ee3b9b. Tree-SHA512: 828bdfe47f4fffa5d00a2cf88db6cea4a2714d9c49276841ca5cbdd1603b87bb6862147b86edcf36d7b40314ddb80b1a07fd399faf288572c55cc788c5cf9526
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Bitcoin is an experimental digital currency that enables instant payments to anyone, anywhere in the world. Bitcoin uses peer-to-peer technology to operate with no central authority: managing transactions and issuing money are carried out collectively by the network. Bitcoin Core is the name of open source software which enables the use of this currency.
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