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Finding Strength Length in nginx.conf File

I have a problem with my $ memcached_keys being too long in my .conf file for nginx. I am using memcached module, but some of my urls are too long. I'm currently trying to use MD5 hashes for users, but at the same time I'm just wondering if there is a way to check the length of a string stored in a variable.

So:

set $memcached_key "byp-$uri";
if ($args) {
    set $memcached_key "byp-$uri?$args";
}

if (len($memcache_key) < 250) {
     memcached_pass 127.0.0.1:11211;
     error_page 404 = @cache_miss;
     error_page 502 = @cache_miss;
}
else {
    pass to @cache_miss;
}
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2 answers


I'm not sure, but I don't think it can be done in nginx language. I suspect it will be documented here if it exists and I can't see anything.



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Old question, but ....

To do this, you need a scripting setup like the Lua module:



location / {
    set_by_lua $memcached_key '
        if not ngx.var.args then 
            return "byp-" ..  ngx.var.uri
        else 
            return "byp-" ..  ngx.var.uri .. "?" ..  ngx.var.args
        end
    ';
    content_by_lua '
        local string = string;
        if string.len($memcached_key) < 250 then
            ngx.exec("/memcached");
        else
            ngx.exec("/cache_miss");
        end
    ';
}
location /memcached {
    internal;
    memcached_pass 127.0.0.1:11211;
    error_page 404 = /cache_miss;
    error_page 502 = /cache_miss;
}
location /cache_miss {
    internal;
    ...
}

Suggest "indoor" locations instead of named locations due to a few quirks with the latter, but also named locations.

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