Added scrolling functionality

uwsgitop

@@ -118,12 +118,15 @@ last_reqnumber_per_core = defaultdict(int)
 # 1 - merge core statistics with worker statistics
 # 2 - display active cores under workers
 async_mode = 0
+scroll_shift = 0
 
 while True:
 
     screen.clear()
+    (screen_height, screen_width) = screen.getmaxyx()
 
     js = ''
+    count_entries = 0
 
     try:
         s = socket.socket(sfamily, socket.SOCK_STREAM)
@@ -184,6 +187,9 @@ while True:
         dt = time.time() - last_tot_time
         total_rps = 0
         for worker in dd['workers']:
+            if async_mode != 1:
+                count_entries += 1
+
             wid = worker['id']
             curr_reqnumber = worker['requests']
             last_reqnumber = last_reqnumber_per_worker[wid]
@@ -196,6 +202,8 @@ while True:
                 if not core['requests']:
                     # ignore unused cores
                     continue
+                count_entries += 1
+
                 wcid = (wid, core['id'])
                 curr_reqnumber = core['requests']
                 last_reqnumber = last_reqnumber_per_core[wcid]
@@ -213,7 +221,7 @@ while True:
         tx = human_size(sum( [worker['tx'] for worker in dd['workers']] ))
         screen.addstr(0, 0, "uwsgi%s - %s - req: %d - RPS: %d - lq: %d - tx: %s" % (uversion, time.ctime(), tot, int(round(total_rps)), dd['listen_queue'], tx))
         screen.addstr(2, 0, " WID\t%\tPID\tREQ\tRPS\tEXC\tSIG\tSTATUS\tAVG\tRSS\tVSZ\tTX\tRunT\t", curses.A_REVERSE)
-        pos = 3
+        pos = 3 + scroll_shift
 
         dd['workers'].sort(key=reqcount)
         for worker in dd['workers']:
@@ -242,14 +250,15 @@ while True:
 
             rps = int(round(rps_per_worker[wid]))
 
-            try:
-                screen.addstr(pos, 0, " %s\t%.1f\t%d\t%d\t%d\t%d\t%d\t%s\t%dms\t%s\t%s\t%s\t%s" % (
-                    wid, calc_percent(tot, worker['requests']),  worker['pid'], worker['requests'], rps, worker['exceptions'], sigs, worker['status'],
-                    worker['avg_rt']/1000, human_size(worker['rss']), human_size(worker['vsz']),
-                    wtx, wrunt
-                ), color)
-            except:
-                pass
+            if pos >= 3:
+                try:
+                    screen.addstr(pos, 0, " %s\t%.1f\t%d\t%d\t%d\t%d\t%d\t%s\t%dms\t%s\t%s\t%s\t%s" % (
+                        wid, calc_percent(tot, worker['requests']),  worker['pid'], worker['requests'], rps, worker['exceptions'], sigs, worker['status'],
+                        worker['avg_rt']/1000, human_size(worker['rss']), human_size(worker['vsz']),
+                        wtx, wrunt
+                    ), color)
+                except:
+                    pass
             pos += 1
             if async_mode != 2:
                 continue
@@ -263,12 +272,13 @@ while True:
 
                 cid = core['id']
                 rps = int(round(rps_per_core[wid, cid]))
-                try:
-                    screen.addstr(pos, 0, "  :%s\t%.1f\t-\t%d\t%d\t-\t-\t%s\t-\t-\t-\t-\t-" % (
-                        cid, calc_percent(tot, core['requests']),  core['requests'], rps, status,
-                    ), color)
-                except:
-                    pass
+                if pos >= 3:
+                    try:
+                        screen.addstr(pos, 0, "  :%s\t%.1f\t-\t%d\t%d\t-\t-\t%s\t-\t-\t-\t-\t-" % (
+                            cid, calc_percent(tot, core['requests']), core['requests'], rps, status
+                        ), color)
+                    except:
+                        pass
                 pos += 1
 
     screen.refresh()
@@ -280,5 +290,15 @@ while True:
         break
     elif ch == ord('a'):
         async_mode = (async_mode + 1) % 3
+        scroll_shift = 0
+    elif ch == curses.KEY_PPAGE or ch == ord('n'):
+        scroll_shift += screen_height / 2
+        if scroll_shift > 0:
+            scroll_shift = 0
+    elif ch == curses.KEY_NPAGE or ch == ord('m'):
+        if count_entries > screen_height - 3:
+            scroll_shift -= screen_height / 2
+            if scroll_shift + count_entries + 3 < screen_height:
+                scroll_shift = -1 * (count_entries - screen_height + 3)