Class: Textus::Read::PolicyExplain

Inherits:
Object
  • Object
show all
Defined in:
lib/textus/read/policy_explain.rb

Overview

For one key, surface every matching policy block along with the per-slot effective value (which loses ties win-by-specificity) and the effective guard predicate names for every write transition (ADR 0031).

Instance Method Summary collapse

Constructor Details

#initialize(container:, call: nil) ⇒ PolicyExplain

rubocop:disable Lint/UnusedMethodArgument



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# File 'lib/textus/read/policy_explain.rb', line 7

def initialize(container:, call: nil) # rubocop:disable Lint/UnusedMethodArgument
  @manifest = container.manifest
  @schemas  = container.schemas
end

Instance Method Details

#call(key:) ⇒ Object 



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# File 'lib/textus/read/policy_explain.rb', line 12

def call(key:)
  matching = @manifest.rules.explain(key)
  winners  = @manifest.rules.for(key)
  factory  = Textus::Domain::Policy::GuardFactory.new(manifest: @manifest, schemas: @schemas)

  {
    key: key,
    matched_blocks: matching.map do |b|
      {
        match: b.match,
        fetch: !b.fetch.nil?,
        handler_allowlist: !b.handler_allowlist.nil?,
        guard: !b.guard.nil?,
        retention: !b.retention.nil?,
      }
    end,
    effective: {
      fetch: winners.fetch && {
        ttl_seconds: winners.fetch.ttl_seconds,
        on_stale: winners.fetch.on_stale,
      },
      handler_allowlist: winners.handler_allowlist&.handlers,
      retention: winners.retention && {
        expire_after: winners.retention.expire_after,
        archive_after: winners.retention.archive_after,
      },
    },
    guards: Textus::Domain::Policy::BaseGuards::BASE.keys.to_h do |transition|
      [transition, factory.for(transition, key).predicates.map(&:name)]
    end,
  }
end