Hi,
I'm using the lua module to produce randomly generated IDs for each request (and its response). My nginx.conf looks a little like this:
------
log_format rids '$request_id ...';
access_log /var/log/access.log rids;
server {
listen 80 default;
...
access_by_lua_file /var/nginx/lua/request_ids.lua;
}
-----
and the request_ids.lua looks like this:
-----
function newGuid ()
return ngx.md5(ngx.var.pid .. ngx.req.start_time() .. math.random() .. ngx.var.remote_addr .. ngx.var.request)
end
ngx.var.request_id = newGuid()
-----
This, as I understand it, should set the nginx var request_id to the value of newGuid() for every request, allowing us to add $request_id to each log entry.
However, about 25% of the access.log entries don't have a request_id value- the value is just empty (what we initialise request_id to before the access_by_lua_file statement).
Is there a reason access_by_lua_file would execute after request_id was initialised to an empty value? Any other idea why we're missing values for such a high proportion of requests.
Huge thanks in advance!
Paul
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