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prometheus-node-exporter-lua: use uhttpd-mod-lua

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listen_ipv6 config option is removed and we now
listen on both ipv4 and ipv6 addresses.
HTTP keepalive is enabled and set to 70s by default.

With uhttpd-mod-lua there is a small change in behavior,
all code is loaded/parsed/executed once on startup as before,
but now each request is executed in his own fork, so we can't
keep a state between requests.

Signed-off-by: Etienne Champetier <champetier.etienne@gmail.com>
(cherry picked from commit 60460f0046)
This commit is contained in:
Etienne Champetier
2022-04-23 23:29:30 -04:00
committed by Etienne Champetier
parent ab327729c8
commit a9accc565d
4 changed files with 32 additions and 64 deletions
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54
utils/prometheus-node-exporter-lua/files/usr/bin/prometheus-node-exporter-lua
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@@ -59,7 +59,7 @@ function timed_scrape(collector)
local status, err = pcall(collector.scrape)
if not status then
success = 0
print(err)
io.stderr:write(err)
end
return (socket.gettime() - start_time), success
end
@@ -79,22 +79,18 @@ end
-- Web server-specific functions
function http_ok_header()
output("HTTP/1.0 200 OK\r\nServer: lua-metrics\r\nContent-Type: text/plain; version=0.0.4\r\n\r")
end
function http_not_found()
output("HTTP/1.0 404 Not Found\r\nServer: lua-metrics\r\nContent-Type: text/plain\r\n\r\nERROR: File Not Found.")
end
function serve(request)
local q = request:match("^GET /metrics%??([^ ]*) HTTP/1%.[01]$")
if q == nil then
http_not_found()
function handle_request(env)
if env.PATH_INFO ~= '/metrics' then
uhttpd.send("Status: 404 Not Found\r\n")
uhttpd.send("Server: lua-metrics\r\n")
uhttpd.send("Content-Type: text/plain\r\n\r\n")
uhttpd.send("ERROR: File Not Found.")
else
http_ok_header()
uhttpd.send("Status: 200 OK\r\n")
uhttpd.send("Server: lua-metrics\r\n")
uhttpd.send("Content-Type: text/plain; version=0.0.4\r\n\r\n")
local cols = {}
for c in q:gmatch("collect[^=]*=([^&]+)") do
for c in env.QUERY_STRING:gmatch("collect[^=]*=([^&]+)") do
cols[#cols+1] = c
end
if #cols == 0 then
@@ -102,21 +98,10 @@ function serve(request)
end
run_all_collectors(cols)
end
client:close()
return true
end
-- Main program
for k,v in ipairs(arg) do
if (v == "-p") or (v == "--port") then
port = arg[k+1]
end
if (v == "-b") or (v == "--bind") then
bind = arg[k+1]
end
end
col_mods = {}
col_names = {}
ls_fd = io.popen("ls -1 /usr/lib/lua/prometheus-collectors/*.lua")
@@ -127,22 +112,9 @@ for c in ls_fd:lines() do
end
ls_fd:close()
if port then
server = assert(socket.bind(bind, port))
output = function (str) uhttpd.send(str.."\n") end
while 1 do
client = server:accept()
client:settimeout(60)
local request, err = client:receive()
if not err then
output = function (str) client:send(str.."\n") end
if not serve(request) then
break
end
end
end
else
if arg ~= nil then
output = print
run_all_collectors(col_names)
end