struct

KEV::Diff

Snapshot-vs-snapshot delta for two Catalog instances.

Produced by Catalog#diff(other). Useful for KEV monitoring jobs that want a single "what changed since the last poll" call.

delta = old_catalog.diff(new_catalog)
delta.added.each { |v| notify("new KEV", v) }
delta.removed.each { |v| audit_log("KEV removed", v) }
delta.changed.each { |before, after| diff_log(before, after) }

Membership is keyed by cve_id. changed contains pairs where the CVE appears in both snapshots but at least one other field differs. Use same_cve? semantics when reasoning about identity.

Constructors

new(added : Array(Vulnerability), removed : Array(Vulnerability), changed : Array(Tuple(Vulnerability, Vulnerability)), unchanged : Array(Vulnerability))

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Instance methods

added

CVEs in after that were absent from before.

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changed

CVEs present in both snapshots whose fields differ. Tuples are (before, after) so callers can render side-by-side diffs.

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empty?

true when nothing was added, removed, or modified.

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inspect(io : IO) : Nil

Appends this struct's name and instance variables names and values to the given IO.

struct Point
  def initialize(@x : Int32, @y : Int32)
  end
end

p1 = Point.new 1, 2
p1.to_s    # "Point(@x=1, @y=2)"
p1.inspect # "Point(@x=1, @y=2)"

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removed

CVEs in before that have been removed in after. CISA does occasionally retract entries; this captures those.

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size

Total count of CVEs that differ between the two snapshots (added + removed + changed).

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unchanged

CVEs present in both snapshots and field-for-field identical. Not usually rendered, but exposed for completeness so callers can assert "nothing changed" without re-computing.

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