{luatz,doc}/gettime: Add Openresty's ngx.now as a source

nginx has it's own gettimeofday() cache, this will fetch the time from there.
It has only in millisecond granularity, so place it after luasocket in preferential order

As requested by bngle

diff --git a/doc/gettime.md b/doc/gettime.md
index faabfb417445f13b85c2bd281f2c8fb04e767dbe..0457855cdcf384cd0ffc760ff0082f1f2fa0c1b6 100644 (file)
--- a/doc/gettime.md
+++ b/doc/gettime.md
@@ -8,6 +8,7 @@ Uses the most precise method available (in order:)
          - `clock_gettime(2)` called with `CLOCK_REALTIME`
          - `gettimeofday(2)`
   - [luasocket](http://w3.impa.br/~diego/software/luasocket/)'s `socket.gettime`
+  - [Openresty](http://openresty.org/)'s [`ngx.now`](http://wiki.nginx.org/HttpLuaModule#ngx.now)
   - [`os.time`](http://www.lua.org/manual/5.2/manual.html#pdf-os.time)
 
 ### `source`

diff --git a/luatz/gettime.lua b/luatz/gettime.lua
index 008e95cb57991e0c6971781048afaf863a52a2f2..65366bd3ee2bd79a02cc97940116ab08a285da87 100644 (file)
--- a/luatz/gettime.lua
+++ b/luatz/gettime.lua
@@ -32,6 +32,10 @@ _M.source , _M.resolution , _M.gettime = (function()
                return "socket.gettime()" , 1e-6 , socket.gettime
        end
 
+       if ngx and ngx.now then
+               return "ngx.now()" , 1e-3 , ngx.now
+       end
+
        return "os.time()" , 1 , os.time
 end)()