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@titpetric
Created January 8, 2017 18:34
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Delete NGINX cached items with a PURGE with wildcard support
-- Tit Petric, Monotek d.o.o., Tue 03 Jan 2017 06:54:56 PM CET
--
-- Delete nginx cached assets with a PURGE request against an endpoint
-- supports extended regular expression PURGE requests (/upload/.*)
--
function file_exists(name)
local f = io.open(name, "r")
if f~=nil then io.close(f) return true else return false end
end
function explode(d, p)
local t, ll
t={}
ll=0
if(#p == 1) then return {p} end
while true do
l=string.find(p, d, ll, true) -- find the next d in the string
if l~=nil then -- if "not not" found then..
table.insert(t, string.sub(p, ll, l-1)) -- Save it in our array.
ll=l+1 -- save just after where we found it for searching next time.
else
table.insert(t, string.sub(p, ll)) -- Save what's left in our array.
break -- Break at end, as it should be, according to the lua manual.
end
end
return t
end
function purge(filename)
if (file_exists(filename)) then
os.remove(filename)
end
end
function trim(s)
return (string.gsub(s, "^%s*(.-)%s*$", "%1"))
end
function exec(cmd)
local handle = io.popen(cmd)
local result = handle:read("*all")
handle:close()
return trim(result)
end
function list_files(cache_path, purge_upstream, purge_pattern)
local result = exec("/usr/bin/find " .. cache_path .. " -type f | /usr/bin/xargs --no-run-if-empty -n1000 /bin/grep -El -m 1 '^KEY: " .. purge_upstream .. purge_pattern .. "' 2>&1")
if result == "" then
return {}
end
return explode("\n", result)
end
if ngx ~= nil then
-- list all cached items matching upstream+request_uri (extended regex)
local files = list_files(ngx.var.lua_purge_path, ngx.var.lua_purge_upstream, ngx.var.request_uri)
ngx.header["Content-type"] = "text/plain; charset=utf-8"
ngx.header["X-Purged-Count"] = table.getn(files)
for k, v in pairs(files) do
purge(v)
end
ngx.say("OK")
ngx.exit(ngx.OK)
end
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