function _M.slowLookup()

in scripts/lua/routing.lua [211:260]

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

function _M.slowLookup(resourceKeys, tenant, path, redisKey, cfRedisKey)
  for _, key in pairs(resourceKeys) do
    if key == redisKey or key == cfRedisKey then
      local res = {string.match(key, "([^:]+):([^:]+):([^:]+)")}
      ngx.var.gatewayPath = res[3]
      return key
    end
  end
  local cfUrl = ngx.req.get_headers()["x-cf-forwarded-url"]
  if cfUrl ~= nil and cfUrl ~= "" then
    return nil
  end
  
  local keyTable = {}
  for _, key in pairs(resourceKeys) do
    local _, count = string.gsub(key, "/", "")
    
    if count == 1 and string.sub(key, -1) == "/" then
      count = count - 1
    end
    count = tostring(count)
    if keyTable[count] == nil then
      keyTable[count] = {}
    end
    table.insert(keyTable[count], key)
  end
  
  local _, count = string.gsub(redisKey, "/", "")
  for i = count, 0, -1 do
    local countString = tostring(i)
    if keyTable[countString] ~= nil then
      for _, key in pairs(keyTable[countString]) do
        
        if key == redisKey or key == utils.concatStrings({redisKey, "/"}) or _M.pathParamMatch(key, redisKey) == true then
          local res = {string.match(key, "([^:]+):([^:]+):([^:]+)")}
          ngx.var.gatewayPath = res[3]
          return key
        end
      end
    end
    
    local index = redisKey:match("^.*()/")
    if index == nil then
      return nil
    end
    redisKey = string.sub(redisKey, 1, index - 1)
  end
  return nil

end