Query docker stats via luvit

docker-stats-https.lua

-- env from luvi
local env = require('env')

-- some modules form luvit
local pathJoin = require('path').join
local urlParse = require('url').parse
local jsonParse = require('json').parse
local httpCodec = require('http-codec')

-- Some third-party modules
-- To get these run:
--   lit install creationix/coro-wrapper creationix/coro-tcp creationix/coro-tls creationix/coro-fs
--
local connect = require('coro-tcp').connect
local fs = require('coro-fs')
local tlsWrap = require('coro-tls').wrap
local wrapper = require('coro-wrapper')

-- Enter your container ID
local id = "df321ebcd929"

-- Make sure DOCKER_HOST is set with tcp host and path

-- Test by polling the stats for a container
local config = urlParse(env.get("DOCKER_HOST"))
coroutine.wrap(function ()
  local read, write = assert(connect(config.host, tonumber(config.port)))
  read, write = tlsWrap(read, write, {
    ca = fs.readFile(pathJoin(env.get("DOCKER_CERT_PATH"), "ca.pem")),
    key = fs.readFile(pathJoin(env.get("DOCKER_CERT_PATH"), "key.pem")),
    cert = fs.readFile(pathJoin(env.get("DOCKER_CERT_PATH"), "cert.pem")),
  })
  read = wrapper.reader(read, httpCodec.decoder())
  write = wrapper.writer(write, httpCodec.encoder())

  write({
    method = "GET",
    path = "/containers/" .. id .. "/stats"
  })
  local res = read()
  p(res)
  for data in read do
    p(jsonParse(data))
  end
  write()
end)()