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Description
Proposal Details
The current implementation of log/slog does not fully support logging arrays or slices. As a result, the type implementing the slog.Valuer interface is not respected when passed as an element of an array or slice and the Handler cannot handle the elements within the input array or slice either.
One possible workaround is to create a custom List using a generic struct that implements the slog.LogValuer interface, returns a Group and uses the index as the key. An example of this approach can be found in this comment #63204 (comment)
However, it would make more sense and be more practical if List were natively supported
type listptr *Value // used in Value.any when the Value is a []Value
const (
KindAny Kind = iota
KindBool
KindDuration
KindFloat64
KindInt64
KindString
KindTime
KindUint64
KindGroup
KindLogValuer
KindList
)
// ListValue returns a [Value] for a slice of arbitrary values.
func ListValue(vs ...Value) Value {
return Value{num: uint64(len(vs)), any: listptr(unsafe.SliceData(vs))}
}
// List returns v's value as a []Value.
// It panics if v's [Kind] is not [KindList].
func (v Value) List() []Value{
if sp, ok := v.any.(listptr); ok {
return unsafe.Slice((*Value)(sp), v.num)
}
panic("List: bad kind")
}
func (v Value) list() []Value{
return unsafe.Slice((*Value)(v.any.(listptr)), v.num)
}Metadata
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