function _M.optimizedLookup()

in scripts/lua/lib/redis.lua [712:761]

• 46 lines of code
• 12 McCabe index (conditional complexity)

function _M.optimizedLookup(red, tenant, path)
  if CACHING_ENABLED then
    local cached = c:get(utils.concatStrings({'fastmap:', tenant, ':', path}))
    if cached ~= nil then
      return cached
    end
  end
  local script = [[
    local tenant = ']] .. tenant .. [['
    local path = ']] .. path .. [['
    if redis.call('EXISTS', 'resources:' .. tenant .. ':' .. path) ~= 0 then
      return 'resources:' .. tenant .. ':' .. path
    end
    local currStr = 'fastmap:' .. tenant
    path = string.match(path, '[^?]*')
    local exp_path = string.gmatch(path, '[^/]*')
    local path = {}

    for i in exp_path do
      if i ~= nil and i ~= '' then
        table.insert(path, i)
      end
    end

    for i,v in ipairs(path) do
      if redis.call('EXISTS', currStr .. '/' .. v) == 1 then
        currStr = currStr .. '/' .. v
      elseif redis.call('EXISTS', currStr .. '/.*') == 1 then
        currStr = currStr .. '/.*'
      else
        return 0
      end
    end
    return redis.call('GET', currStr)
  ]]
  if red == nil then
    red = _M.init()
  end
  local result = red:eval(script, 0)
  if type(result) ~= 'string' or result == '' then
    return nil, red
  end
  ngx.var.gatewayPath = result:gsub(utils.concatStrings({'resources:', tenant, ':'}), '')

  if CACHING_ENABLED then
    c:set(utils.concatStrings({'fastmap:', tenant, ':', path}), result, CACHE_TTL)
  end

  return result, red
end