Created
November 2, 2016 11:00
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Delete NGINX cached items from a PURGE request
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| -- Tit Petric, Monotek d.o.o., Thu 27 Oct 2016 10:43:38 AM CEST | |
| -- | |
| -- Delete nginx cached assets with a PURGE request against an endpoint | |
| -- | |
| local md5 = require 'md5' | |
| 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 cache_filename(cache_path, cache_levels, cache_key) | |
| local md5sum = md5.sumhexa(cache_key) | |
| local levels = explode(":", cache_levels) | |
| local filename = "" | |
| local index = string.len(md5sum) | |
| for k, v in pairs(levels) do | |
| local length = tonumber(v) | |
| -- add trailing [length] chars to index | |
| index = index - length; | |
| filename = filename .. md5sum:sub(index+1, index+length) .. "/"; | |
| end | |
| if cache_path:sub(-1) ~= "/" then | |
| cache_path = cache_path .. "/"; | |
| end | |
| filename = cache_path .. filename .. md5sum | |
| return filename | |
| end | |
| function purge(filename) | |
| if (file_exists(filename)) then | |
| os.remove(filename) | |
| end | |
| end | |
| if ngx ~= nil then | |
| local cache_key = ngx.var.lua_purge_upstream .. ngx.var.request_uri | |
| local filename = cache_filename(ngx.var.lua_purge_path, ngx.var.lua_purge_levels, cache_key) | |
| purge(filename) | |
| ngx.say("OK") | |
| ngx.exit(ngx.OK) | |
| end |
Great work! Much thanks.
Noticed that the md5 of the proxy_cache_key does not match the file name when there is a Vary header present. Is it calculated differently in presence of Vary headers?
Author
proxy_ignore_headers Vary
…On Tue, 28 Apr 2020 at 22:50, e1fa16a4ba9c7d32 ***@***.***> wrote:
***@***.**** commented on this gist.
------------------------------
Great work! Much thanks.
Noticed that the md5 of the proxy_cache_key does not match the file name
when there is a Vary header present. Is it calculated differently in
presence of Vary headers?
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great work! but i made some change
local md5 = require 'md5' local md5sum = md5.sumhexa(cache_key)can be replaced by
local md5 = ngx.md5 local md5sum = md5(cache_key)will never require module md5