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haproxy lua script for superserver (to use with s6)
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global | |
lua-load '/servers/haproxy/superserver.lua' | |
frontend tailon-frontend | |
bind :9090 | |
tcp-request content set-var(txn.service_dir) str("/s6-supervised-servers/tailon") | |
tcp-request content lua.extend-life | |
default_backend tailon-backend | |
backend tailon-backend | |
server tailon-server localhost:9200 |
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superserver = {} | |
superserver.version = "0.0.1" | |
-- | |
-- Configuration | |
-- | |
superserver.lifetime = 60 | |
superserver.healthcheck_period = 3 | |
-- | |
-- State | |
-- | |
superserver.expiracy_map = {} | |
-- | |
-- ~Constant~ | |
-- | |
superserver.ticks_by_lifetime = superserver.lifetime / superserver.healthcheck_period | |
-- | |
-- Server killing loop | |
-- | |
superserver.shinigami_task = function() | |
while true do | |
for service_dir, ticks_to_live in pairs(superserver.expiracy_map) do | |
if ticks_to_live == 0 then | |
-- do nothing | |
elseif ticks_to_live == 1 then | |
core.log(core.info, "killing service " .. service_dir) | |
os.execute('s6-svc -d ' .. service_dir) | |
superserver.expiracy_map[service_dir] = 0 | |
else | |
superserver.expiracy_map[service_dir] = ticks_to_live - 1 | |
end | |
end | |
core.sleep(superserver.healthcheck_period) | |
end | |
end | |
-- | |
-- Server launching and life extension | |
-- | |
superserver.extend_life_action = function(txn) | |
-- core.log(core.info, "extend_life txn " .. txn) | |
local service_dir = txn.get_var(txn, 'txn.service_dir') | |
if service_dir then | |
core.log(core.info, "extending life for service_dir " .. service_dir) | |
local ticks_to_live = superserver.expiracy_map[service_dir] or 0 | |
if ticks_to_live == 0 then | |
core.log(core.info, "starting service " .. service_dir) | |
os.execute('s6-svc -u ' .. service_dir) | |
end | |
superserver.expiracy_map[service_dir] = superserver.ticks_by_lifetime | |
else | |
core.log(core.warning, "failed to extend life, service_dir var not set.") | |
end | |
end | |
-- | |
-- Register code in haproxy! | |
-- | |
core.register_task(superserver.shinigami_task) | |
core.register_action('extend-life', {'tcp-req', 'tcp-res', | |
'http-req', 'http-res'}, | |
superserver.extend_life_action) |
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