kubeinvaders/scripts/node.lua

local https = require "ssl.https"
local ltn12 = require "ltn12"
local json = require 'lunajson'
local redis = require "resty.redis"

local k8s_url = ""
local kube_host = os.getenv("KUBERNETES_SERVICE_HOST")
local kube_port = os.getenv("KUBERNETES_SERVICE_PORT_HTTPS")
local endpoint = os.getenv("ENDPOINT")

if kube_host and kube_host ~= "" then
  local port_suffix = ""
  if kube_port and kube_port ~= "" then
    port_suffix = ":" .. kube_port
  end
  k8s_url = "https://" .. kube_host .. port_suffix
else
  k8s_url = endpoint or ""
end

local disable_tls_env = string.lower(tostring(os.getenv("DISABLE_TLS") or "false"))
local disable_tls = disable_tls_env == "true" or disable_tls_env == "1" or disable_tls_env == "yes"
local arg = ngx.req.get_uri_args()
local req_headers = ngx.req.get_headers()
local target = arg['target'] or req_headers["x-k8s-target"] or req_headers["X-K8S-Target"]
local header_token = req_headers["x-k8s-token"] or req_headers["X-K8S-Token"]
local token = ""
if header_token and header_token ~= "" then
  token = header_token
else
  token = tostring(os.getenv("TOKEN") or "")
end
if token == "" then
  local f = io.open("/var/run/secrets/kubernetes.io/serviceaccount/token", "r")
  if f then
    token = f:read("*a") or ""
    token = token:gsub("%s+$", "")
    f:close()
  end
end
local ca_cert_b64 = req_headers["x-k8s-ca-cert-b64"] or req_headers["X-K8S-CA-CERT-B64"]
local ca_cert = nil
if ca_cert_b64 and ca_cert_b64 ~= "" then
  ca_cert = ngx.decode_base64(ca_cert_b64)
end

if target and target ~= "" then
  if not string.match(target, "^https?://") then
    target = "https://" .. target
  end
  k8s_url = string.gsub(target, "/+$", "")
end

if k8s_url == "" then
  ngx.status = 500
  ngx.say("Missing Kubernetes endpoint configuration. Set KUBERNETES_SERVICE_HOST or ENDPOINT.")
  ngx.exit(ngx.OK)
end

if not string.match(k8s_url, "^https?://") then
  k8s_url = "https://" .. k8s_url
end

k8s_url = string.gsub(k8s_url, "/+$", "")

if token == "" then
  ngx.status = 500
  ngx.say("Missing Kubernetes API token configuration.")
  ngx.exit(ngx.OK)
end

local url = k8s_url.. "/api/v1/nodes"
local decoded = nil
local nodes = {}

if ngx.var.request_method == "GET" and string.match(ngx.var.request_uri, "^.*/chaos[-]node.*$") then
  local red = redis:new()
  local okredis, errredis = red:connect("unix:/tmp/redis.sock")

  if okredis then
    ngx.log(ngx.INFO, "Connection to Redis is ok")
  else
    ngx.log(ngx.INFO, "Connection to Redis is not ok")
    ngx.log(ngx.INFO, errredis)
  end
  -- Count the total of chaos jobs launched against nodes
  local chaos_node_res, err = red:get("chaos_node_jobs_total")

  if chaos_node_res == ngx.null then
    ngx.say(err)
    red:set("chaos_node_jobs_total", 0)
  else
    local incr = chaos_node_res + 1
    local res, err = red:set("chaos_node_jobs_total",incr)
  end

  -- Count the total of chaos jobs launched against nodes per node
  local node_name = arg['node_name']
  local chaos_node_res, err = red:get("chaos_node_jobs_total_on_" .. node_name)
  if chaos_node_res == ngx.null then
    ngx.say(err)
    red:set("chaos_node_jobs_total_on_" .. node_name, 1)
  else
    local incr = chaos_node_res + 1
    local res, err = red:set("chaos_node_jobs_total_on_" .. node_name,incr)
  end
end

ngx.header['Access-Control-Allow-Origin'] = '*'
ngx.header['Access-Control-Allow-Methods'] = 'GET, POST, OPTIONS'
ngx.header['Access-Control-Allow-Headers'] = 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range'
ngx.header['Access-Control-Expose-Headers'] = 'Content-Length,Content-Range';

ngx.log(ngx.INFO, "Requesting nodes using this url: " .. url)

local headers = {
  ["Accept"] = "application/json",
  ["Content-Type"] = "application/json",
  ["Authorization"] = "Bearer " .. token,
}

local resp = {}

local request_opts = {
  url = url,
  headers = headers,
  method = "GET",
  verify = disable_tls and "none" or "peer",
  sink = ltn12.sink.table(resp)
}

if not disable_tls and ca_cert and ca_cert ~= "" then
  local ca_file_path = "/tmp/kubeinv-custom-ca.crt"
  local ca_file = io.open(ca_file_path, "w")
  if ca_file then
    ca_file:write(ca_cert)
    ca_file:close()
    request_opts.cafile = ca_file_path
  end
end

local ok, statusCode, headers, statusText = https.request(request_opts)

ngx.log(ngx.INFO, "REQUEST LOGS...")
ngx.log(ngx.INFO, ok)
ngx.log(ngx.INFO, statusCode)
ngx.log(ngx.INFO, statusText)

nodes["items"] = {}
for k,v in ipairs(resp) do
  ngx.log(ngx.INFO, k)
  decoded = json.decode(v)
  if decoded["kind"] == "NodeList" then
    for k2,v2 in ipairs(decoded["items"]) do
      -- TODO: masters should be included?
      -- if not v2["metadata"]["labels"]["node-role.kubernetes.io/master"] then
      ngx.log(ngx.INFO, "found node " .. v2["metadata"]["name"])
      table.insert(nodes["items"], { name = v2["metadata"]["name"], status = "ready" })
      --end
    end
  end
end
ngx.say(json.encode(nodes))