Generating rrdtool graphs in Ubuntu similar to OpenWrt

bomberb17 · December 21, 2022, 2:31pm

I have setup collecting various system parameters to rrd database for my Raspberry Pi running Ubuntu, and I would like to generate graphs similar to those in luci-app-statistics using rrdtool graph command (i.e. same time steps, colors, grids etc.)
However I cannot find the code that generates those graphs from the rrd files. I was digging in https://github.com/openwrt/luci/tree/master/applications/luci-app-statistics but all I see is some javascript code. Can someone help me with this?

jow · December 21, 2022, 3:46pm

The JavaScript code is the one generating the rrdtool command lines. Add a console.debug(cmdline) here:

github.com

openwrt/luci/blob/master/applications/luci-app-statistics/htdocs/luci-static/resources/statistics/rrdtool.js#l360


      
          
          
		if (L.isObject(cache)) {
          			var key = sfh(cmdline.join('\0'));
          
          
			if (!cache.hasOwnProperty(key))
          				cache[key] = fs.exec_direct('/usr/bin/rrdtool', cmdline, 'blob', true);
          
          
			return cache[key];
          		}
          
          
		return fs.exec_direct('/usr/bin/rrdtool', cmdline, 'blob', true);
          	},
          
          
	_generic: function(opts, host, plugin, plugin_instance, dtype, index) {
          		var defs = [],
          		    gopts = this.opts,
          		    _args = [],
          		    _sources = [],
          		    _stack_neg = [],
          		    _stack_pos = [],
          		    _longest_name = 0,

… in order to see the generated command lines.
Alternatively use your browser debug console and inspect POST requests to /cgi-bin/cgi-exec while the LuCI graphs are rendering. The final rrdtool graph command line will be in the request parameters.

system · December 31, 2022, 3:47pm

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