083316c4fe
c00000df1605788acadceb90c22ae9f00db8a9dc rpc: Add MaybeArg() and Arg() default helper (MarcoFalke)
Pull request description:
Currently the RPC method implementations have many issues:
* Default RPC argument values (and their optionality state) are duplicated in the documentation and the C++ code, with no checks to prevent them from going out of sync.
* Getting an optional RPC argument is verbose, using a ternary operator, or worse, a multi-line `if`.
Fix all issues by adding default helper that can be called via `self.Arg<int>(0)`. The helper needs a few lines of code in the `src/rpc/util.h` header file. Everything else will be implemented in the cpp file once and if an RPC method needs it.
There is also an `self.MaybeArg<int>(0)` helper that works on any arg to return the argument, the default, or a falsy value.
ACKs for top commit:
ajtowns:
reACK c00000df1605788acadceb90c22ae9f00db8a9dc
stickies-v:
re-ACK c00000df1605788acadceb90c22ae9f00db8a9dc
TheCharlatan:
re-ACK c00000df1605788acadceb90c22ae9f00db8a9dc
Tree-SHA512: e7ddcab3faa319bc53edbdf3f89ce83389d2c4e571d5db42401620ff105e522a4a0669dad08e08cde5fd05c790aec3b806f63261a9100c2778865a489e57381e
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