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Update developer notes after params.size() cleanup

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Russell Yanofsky 2017-08-14 23:32:38 -04:00
parent e067673f4e
commit fd5d71ec4b
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doc/developer-notes.md
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@ -570,16 +570,14 @@ A few guidelines for introducing and reviewing new RPC interfaces:
is specified as-is in BIP22.
- Missing arguments and 'null' should be treated the same: as default values. If there is no
default value, both cases should fail in the same way.
default value, both cases should fail in the same way. The easiest way to follow this
guideline is detect unspecified arguments with `params[x].isNull()` instead of
`params.size() <= x`. The former returns true if the argument is either null or missing,
while the latter returns true if is missing, and false if it is null.
- *Rationale*: Avoids surprises when switching to name-based arguments. Missing name-based arguments
are passed as 'null'.
- *Exception*: Many legacy exceptions to this exist, one of the worst ones is
`getbalance` which follows a completely different code path based on the
number of arguments. We are still in the process of cleaning these up. Do not introduce
new ones.
- Try not to overload methods on argument type. E.g. don't make `getblock(true)` and `getblock("hash")`
do different things.