69 lines
2.1 KiB
Lua
69 lines
2.1 KiB
Lua
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-- Tit Petric, Monotek d.o.o., Tue 03 Jan 2017 06:54:56 PM CET
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--
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-- Delete nginx cached assets with a PURGE request against an endpoint
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-- supports extended regular expression PURGE requests (/upload/.*)
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--
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-- https://scene-si.org/2017/01/08/improving-nginx-lua-cache-purge/
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--
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function file_exists(name)
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local f = io.open(name, "r")
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if f~=nil then io.close(f) return true else return false end
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end
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function explode(d, p)
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local t, ll
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t={}
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ll=0
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if(#p == 1) then return {p} end
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while true do
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l=string.find(p, d, ll, true) -- find the next d in the string
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if l~=nil then -- if "not not" found then..
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table.insert(t, string.sub(p, ll, l-1)) -- Save it in our array.
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ll=l+1 -- save just after where we found it for searching next time.
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else
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table.insert(t, string.sub(p, ll)) -- Save what's left in our array.
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break -- Break at end, as it should be, according to the lua manual.
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end
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end
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return t
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end
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function purge(filename)
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if (file_exists(filename)) then
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os.remove(filename)
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end
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end
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function trim(s)
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return (string.gsub(s, "^%s*(.-)%s*$", "%1"))
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end
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function exec(cmd)
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local handle = io.popen(cmd)
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local result = handle:read("*all")
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handle:close()
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return trim(result)
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end
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function list_files(cache_path, purge_pattern)
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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_pattern .. "' 2>&1")
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if result == "" then
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return {}
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end
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return explode("\n", result)
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end
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if ngx ~= nil then
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-- list all cached items matching uri
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local files = list_files(ngx.var.lua_purge_path, ngx.var.uri)
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ngx.header["Content-type"] = "text/plain; charset=utf-8"
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ngx.header["X-Purged-Count"] = table.getn(files)
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for k, v in pairs(files) do
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purge(v)
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end
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ngx.say("OK")
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ngx.exit(ngx.OK)
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end
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