membphis commented on a change in pull request #1153: feature: support for
proxy caching plugin based on disk.
URL: https://github.com/apache/incubator-apisix/pull/1153#discussion_r392657923
##########
File path: lua/apisix/plugins/proxy-cache.lua
##########
@@ -178,6 +158,91 @@ local function match_method_and_status(conf, ctx)
return false
end
+-- refer to https://gist.github.com/titpetric/ed6ec548af160e82c650cf39074878fb
+local function file_exists(name)
+ local f = io_open(name, "r")
+ if f~=nil then io_close(f) return true else return false end
+end
+
+
+local function explode(d, p)
+ local t, ll
+ t={}
+ ll=0
+ if(#p == 1) then return {p} end
+ while true do
+ local l=string.find(p, d, ll, true) -- find the next d in the string
+ if l~=nil then -- if "not not" found then..
+ tab_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
+ tab_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
+
+
+local function generate_cache_filename(cache_path, cache_levels, cache_key)
+ local md5sum = ngx.md5(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
+
+
+local function cache_purge(conf, ctx)
+ local cache_zone_info = ngx_re.split(ctx.var.upstream_cache_zone_info, ",")
+
+ local filename = generate_cache_filename(cache_zone_info[1],
cache_zone_info[2],
+ ctx.var.upstream_cache_key)
+ if file_exists(filename) then
+ os.remove(filename)
Review comment:
that is fine.
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