--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mod_statistics/top.lib.lua	Sun Dec 23 11:00:38 2018 +0000
@@ -0,0 +1,215 @@
+local array = require "util.array";
+local it = require "util.iterators";
+local curses = require "curses";
+local stats = module:require "stats".stats;
+local time = require "socket".gettime;
+
+local sessions_idle_after = 60;
+local stanza_names = {"message", "presence", "iq"};
+
+local top = {};
+top.__index = top;
+
+local status_lines = {
+	"Prosody $version - $time up $up_since, $total_users users, $cpu busy";
+	"Connections: $total_c2s c2s, $total_s2sout s2sout, $total_s2sin s2sin, $total_component component";
+	"Memory: $memory_lua lua, $memory_allocated process ($memory_used in use)";
+	"Stanzas in: $message_in_per_second message/s, $presence_in_per_second presence/s, $iq_in_per_second iq/s";
+	"Stanzas out: $message_out_per_second message/s, $presence_out_per_second presence/s, $iq_out_per_second iq/s";
+};
+
+function top:draw()
+	self:draw_status();
+	self:draw_column_titles();
+	self:draw_conn_list();
+	self.statuswin:refresh();
+	self.listwin:refresh();
+	--self.infowin:refresh()
+	self.stdscr:move(#status_lines,0)
+end
+
+-- Width specified as cols or % of unused space, defaults to
+-- title width if not specified
+local conn_list_columns = {
+	{ title = "ID", key = "id", width = "8" };
+	{ title = "JID", key = "jid", width = "100%" };
+	{ title = "STANZAS IN>", key = "total_stanzas_in", align = "right" };
+	{ title = "MSG", key = "message_in", align = "right", width = "4" };
+	{ title = "PRES", key = "presence_in", align = "right", width = "4" };
+	{ title = "IQ", key = "iq_in", align = "right", width = "4" };
+	{ title = "STANZAS OUT>", key = "total_stanzas_out", align = "right" };
+	{ title = "MSG", key = "message_out", align = "right", width = "4" };
+	{ title = "PRES", key = "presence_out", align = "right", width = "4" };
+	{ title = "IQ", key = "iq_out", align = "right", width = "4" };
+	{ title = "BYTES IN", key = "bytes_in", align = "right" };
+	{ title = "BYTES OUT", key = "bytes_out", align = "right" };
+
+};
+
+function top:draw_status()
+	for row, line in ipairs(status_lines) do
+		self.statuswin:mvaddstr(row-1, 0, (line:gsub("%$([%w_]+)", self.data)));
+		self.statuswin:clrtoeol();
+	end
+	-- Clear stanza counts
+	for _, stanza_type in ipairs(stanza_names) do
+		self.prosody[stanza_type.."_in_per_second"] = 0;
+		self.prosody[stanza_type.."_out_per_second"] = 0;
+	end
+end
+
+local function padright(s, width)
+	return s..string.rep(" ", width-#s);
+end
+
+local function padleft(s, width)
+	return string.rep(" ", width-#s)..s;
+end
+
+function top:resized()
+	self:recalc_column_widths();
+	--self.stdscr:clear();
+	self:draw();
+end
+
+function top:recalc_column_widths()
+	local widths = {};
+	self.column_widths = widths;
+	local total_width = curses.cols()-4;
+	local free_width = total_width;
+	for i = 1, #conn_list_columns do
+		local width = conn_list_columns[i].width or "0";
+		if not(type(width) == "string" and width:sub(-1) == "%") then
+			width = math.max(tonumber(width), #conn_list_columns[i].title+1);
+			widths[i] = width;
+			free_width = free_width - width;
+		end
+	end
+	for i = 1, #conn_list_columns do
+		if not widths[i] then
+			local pc_width = tonumber((conn_list_columns[i].width:gsub("%%$", "")));
+			widths[i] = math.floor(free_width*(pc_width/100));
+		end
+	end
+	return widths;
+end
+
+function top:draw_column_titles()
+	local widths = self.column_widths;
+	self.listwin:attron(curses.A_REVERSE);
+	self.listwin:mvaddstr(0, 0, "  ");
+	for i, column in ipairs(conn_list_columns) do
+		self.listwin:addstr(padright(column.title, widths[i]));
+	end
+	self.listwin:addstr("  ");
+	self.listwin:attroff(curses.A_REVERSE);
+end
+
+local function session_compare(session1, session2)
+	local stats1, stats2 = session1.stats, session2.stats;
+	return (stats1.total_stanzas_in + stats1.total_stanzas_out) >
+		(stats2.total_stanzas_in + stats2.total_stanzas_out);
+end
+
+function top:draw_conn_list()
+	local rows = curses.lines()-(#status_lines+2)-5;
+	local cutoff_time = time() - sessions_idle_after;
+	local widths = self.column_widths;
+	local top_sessions = array.collect(it.values(self.active_sessions)):sort(session_compare);
+	for index = 1, rows do
+		local session = top_sessions[index];
+		if session then
+			if session.last_update < cutoff_time then
+				self.active_sessions[session.id] = nil;
+			else
+				local row = {};
+				for i, column in ipairs(conn_list_columns) do
+					local width = widths[i];
+					local v = tostring(session[column.key] or ""):sub(1, width);
+					if #v < width then
+						if column.align == "right" then
+							v = padleft(v, width-1).." ";
+						else
+							v = padright(v, width);
+						end
+					end
+					table.insert(row, v);
+				end
+				if session.updated then
+					self.listwin:attron(curses.A_BOLD);
+				end
+				self.listwin:mvaddstr(index, 0, "  "..table.concat(row));
+				if session.updated then
+					session.updated = false;
+					self.listwin:attroff(curses.A_BOLD);
+				end
+			end
+		else
+			-- FIXME: How to clear a line? It's 5am and I don't feel like reading docs.
+			self.listwin:move(index, 0);
+			self.listwin:clrtoeol();
+		end
+	end
+end
+
+function top:update_stat(name, value)
+	self.prosody[name] = value;
+end
+
+function top:update_session(id, jid, stats)
+	self.active_sessions[id] = stats;
+	stats.id, stats.jid, stats.stats = id, jid, stats;
+	stats.total_bytes = stats.bytes_in + stats.bytes_out;
+	for _, stanza_type in ipairs(stanza_names) do
+		self.prosody[stanza_type.."_in_per_second"] = (self.prosody[stanza_type.."_in_per_second"] or 0) + stats[stanza_type.."_in"];
+		self.prosody[stanza_type.."_out_per_second"] = (self.prosody[stanza_type.."_out_per_second"] or 0) + stats[stanza_type.."_out"];
+	end
+	stats.total_stanzas_in = stats.message_in + stats.presence_in + stats.iq_in;
+	stats.total_stanzas_out = stats.message_out + stats.presence_out + stats.iq_out;
+	stats.last_update = time();
+	stats.updated = true;
+end
+
+local function new(base)
+	setmetatable(base, top);
+	base.data = setmetatable({}, {
+		__index = function (t, k)
+			local stat = stats[k];
+			if stat and stat.tostring then
+				if type(stat.tostring) == "function" then
+					return stat.tostring(base.prosody[k]);
+				elseif type(stat.tostring) == "string" then
+					local v = base.prosody[k];
+					if v == nil then
+						return "?";
+					end
+					return (stat.tostring):format(v);
+				end
+			end
+			return base.prosody[k];
+		end;
+	});
+
+	base.active_sessions = {};
+
+	base.statuswin = curses.newwin(#status_lines, 0, 0, 0);
+
+	base.promptwin = curses.newwin(1, 0, #status_lines, 0);
+	base.promptwin:addstr("");
+	base.promptwin:refresh();
+
+	base.listwin = curses.newwin(curses.lines()-(#status_lines+2)-5, 0, #status_lines+1, 0);
+	base.listwin:syncok();
+
+	base.infowin = curses.newwin(5, 0, curses.lines()-5, 0);
+	base.infowin:mvaddstr(1, 1, "Hello world");
+	base.infowin:border(0,0,0,0);
+	base.infowin:syncok();
+	base.infowin:refresh();
+
+	base:resized();
+
+	return base;
+end
+
+return { new = new };