Sanity check for empty variables #3021
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Empty variables have nil value and default type, this change adds sanity checks before the value is type asserted and cause panic.
codexnull
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Feb 15, 2019
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February 14, 2019 18:57
Val types use a field Value which is an interface. Type assertions of Value will panic when it is nil. The Safe() function will ensure a non-nil Value is returned. It won't change it, only make type assertions safer. Note that invalid type assertions are still possible.
A Val of type DefaultID could be a default value, play it safe.
martinmr
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* types/sort.go: sanity check for empty variables Empty variables have nil value and default type, this change adds sanity checks before the value is type asserted and cause panic. * query/query.go: enhanced default value vars comment * types/scalar_types.go: added func Safe() Val types use a field Value which is an interface. Type assertions of Value will panic when it is nil. The Safe() function will ensure a non-nil Value is returned. It won't change it, only make type assertions safer. Note that invalid type assertions are still possible. * types/conversion.go: use Safe() in MarshalJSON() for DefaultID A Val of type DefaultID could be a default value, play it safe. * types/sort.go: use Safe() and narrow the field to DefaultID * types/sort.go: revert unneeded change
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Empty variables have nil value and default type, this change
adds sanity checks before the value is type asserted and cause panic.
This change is