Module: Shipeasy::SDK::Eval

Defined in:
lib/shipeasy/sdk/eval.rb

Defined Under Namespace

Classes: ExperimentResult

Class Method Summary collapse

Class Method Details

.enabled?(v) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/shipeasy/sdk/eval.rb', line 10

def self.enabled?(v)
  v == 1 || v == true
end

.eval_experiment(exp, flags_blob, exps_blob, user) ⇒ Object 



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# File 'lib/shipeasy/sdk/eval.rb', line 77

def self.eval_experiment(exp, flags_blob, exps_blob, user)
  not_in = ExperimentResult.new(in_experiment: false, group: "control", params: nil)

  return not_in unless exp && exp["status"] == "running"

  targeting_gate = exp["targetingGate"]
  if targeting_gate && !targeting_gate.empty?
    gate = flags_blob&.dig("gates", targeting_gate)
    return not_in unless gate && eval_gate(gate, user)
  end

  uid = user["user_id"] || user[:user_id] || user["anonymous_id"] || user[:anonymous_id]
  return not_in unless uid

  universe_name = exp["universe"]
  universe = exps_blob&.dig("universes", universe_name)
  holdout = universe&.dig("holdout_range")
  if holdout
    seg = murmur3("#{universe_name}:#{uid}") % 10000
    return not_in if seg >= holdout[0] && seg <= holdout[1]
  end

  salt          = exp["salt"]
  allocation_pct = exp["allocationPct"] || 0
  return not_in if murmur3("#{salt}:alloc:#{uid}") % 10000 >= allocation_pct

  group_hash = murmur3("#{salt}:group:#{uid}") % 10000
  cumulative = 0
  groups = exp["groups"] || []
  groups.each_with_index do |g, i|
    cumulative += g["weight"]
    if group_hash < cumulative || i == groups.length - 1
      return ExperimentResult.new(in_experiment: true, group: g["name"], params: g["params"])
    end
  end

  not_in
end

.eval_gate(gate, user) ⇒ Object 



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# File 'lib/shipeasy/sdk/eval.rb', line 60

def self.eval_gate(gate, user)
  return false if enabled?(gate["killswitch"])
  return false unless enabled?(gate["enabled"])

  (gate["rules"] || []).each do |rule|
    return false unless match_rule(rule, user)
  end

  uid = user["user_id"] || user[:user_id] || user["anonymous_id"] || user[:anonymous_id]
  return false unless uid

  salt = gate["salt"] || gate[:salt]
  murmur3("#{salt}:#{uid}") % 10000 < (gate["rolloutPct"] || gate[:rolloutPct] || 0)
end

.match_rule(rule, user) ⇒ Object 



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# File 'lib/shipeasy/sdk/eval.rb', line 23

def self.match_rule(rule, user)
  attr  = rule["attr"] || rule[:attr]
  op    = rule["op"]   || rule[:op]
  value = rule["value"] || rule[:value]
  actual = user[attr] || user[attr.to_sym]

  case op
  when "eq"       then actual == value
  when "neq"      then actual != value
  when "in"       then Array(value).include?(actual)
  when "not_in"   then !Array(value).include?(actual)
  when "contains"
    if actual.is_a?(String) && value.is_a?(String)
      actual.include?(value)
    elsif actual.is_a?(Array)
      actual.include?(value)
    else
      false
    end
  when "regex"
    actual.is_a?(String) && value.is_a?(String) &&
      Regexp.new(value).match?(actual) rescue false
  when "gt", "gte", "lt", "lte"
    a = to_num(actual)
    b = to_num(value)
    return false if a.nil? || b.nil?
    case op
    when "gt"  then a > b
    when "gte" then a >= b
    when "lt"  then a < b
    when "lte" then a <= b
    end
  else
    false
  end
end

.murmur3(key) ⇒ Object 



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# File 'lib/shipeasy/sdk/eval.rb', line 6

def self.murmur3(key)
  Murmur3.hash32(key, 0)
end

.to_num(v) ⇒ Object 



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# File 'lib/shipeasy/sdk/eval.rb', line 14

def self.to_num(v)
  case v
  when Numeric then v.finite? ? v : nil
  when String
    n = Float(v) rescue nil
    n&.finite? ? n : nil
  end
end