tools: add python node cluster runner

python/tools/cluster.py

+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+# Copyright (C) 2015-2016 Savoir-faire Linux Inc.
+# Author(s): Adrien Béraud <adrien.beraud@savoirfairelinux.com>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; If not, see <http://www.gnu.org/licenses/>.
+
+import os, sys, time, cmd
+import subprocess
+import signal
+import argparse
+import threading
+
+import opendht as dht
+
+class NodeCluster(object):
+    nodes = []
+    node_uid = 0
+
+    @staticmethod
+    def run_node(ip4, ip6, p, bootstrap=None, is_bootstrap=False, logfile=None):
+        print("run_node", ip4, ip6, p, bootstrap, logfile)
+        n = dht.DhtRunner()
+        n.run(ipv4=ip4 if ip4 else "", ipv6=ip6 if ip6 else "", port=p, is_bootstrap=is_bootstrap)
+        if logfile:
+            n.enableFileLogging(logfile)
+        if bootstrap:
+            print("bootstrap", bootstrap[0], bootstrap[1])
+            n.bootstrap(bootstrap[0], bootstrap[1])
+        time.sleep(.01)
+        return ((ip4, ip6, p), n, id)
+
+    @staticmethod
+    def find_ip(iface):
+        if not iface or iface == 'any':
+            return ('0.0.0.0','')
+
+        if_ip4 = netifaces.ifaddresses(iface)[netifaces.AF_INET][0]['addr']
+        if_ip6 = netifaces.ifaddresses(iface)[netifaces.AF_INET6][0]['addr']
+        return (if_ip4, if_ip6)
+
+    def __init__(self, iface=None, ip4=None, ip6=None, port=4000, bootstrap=None, first_bootstrap=False, logfile=None):
+        NodeCluster.iface = iface
+        self.port = port
+        ips = NodeCluster.find_ip(iface)
+        self.logfile = logfile
+        self.ip4 = ip4 if ip4 else ips[0]
+        self.ip6 = ip6 if ip6 else ips[1]
+        self.bootstrap = bootstrap
+        if bootstrap:
+            self.bootstrap = (bootstrap.hostname, str(bootstrap.port) if bootstrap.port else "4222")
+        else:
+            print("Using fallback bootstrap", self.ip4, self.port)
+            self.bootstrap = ((self.ip4, str(self.port)))
+        if first_bootstrap:
+            print("Starting bootstrap node")
+            self.nodes.append(NodeCluster.run_node(self.ip4, self.ip6, self.port, self.bootstrap, is_bootstrap=True))
+            self.bootstrap = ((self.ip4, str(self.port)))
+            self.port += 1
+        #print(self.ip4, self.ip6, self.port)
+
+    def front(self):
+        if len(self.nodes) == 0:
+            return None
+        return self.nodes[0][1]
+
+    def get(self, i=None):
+        if not self.nodes:
+            return None
+
+        if i is None:
+            l = list(self.nodes)
+            random.shuffle(l)
+            return l[0][1]
+        else:
+            return self.nodes[i][1]
+
+    def getNodeInfoById(self, id=None):
+        if id:
+            for n in self.nodes:
+                if n[1].getNodeId() == id:
+                    return n
+        return None
+
+    def launch_node(self):
+        node_logfile = (self.logfile + str(self.node_uid) + '.log') if self.logfile else None
+        n = NodeCluster.run_node(self.ip4, self.ip6, self.port, self.bootstrap, logfile=node_logfile)
+        self.nodes.append(n)
+        self.port += 1
+        self.node_uid += 1
+        return n
+
+    def end_node(self, id=None, shutdown=False, last_msg_stats=None):
+        """
+        Ends a running node.
+
+        @param id: The 40 hex chars id of the node.
+        @type  id: bytes
+
+        @return: If a node was deleted or not.
+        @rtype : boolean
+        """
+        lock = threading.Condition()
+        def shutdown_cb():
+            nonlocal lock
+            NodeCluster.Log.log('Done.')
+            with lock:
+                lock.notify()
+
+        if not self.nodes:
+            return
+        elif id:
+            n = self.getNodeInfoById(id)
+            if n:
+                if shutdown:
+                    with lock:
+                        print('Waiting for node to shutdown... ')
+                        n[1].shutdown(shutdown_cb)
+                        lock.wait()
+                    if last_msg_stats:
+                        last_msg_stats.append(self.getMessageStats())
+                n[1].join()
+                self.nodes.remove(n)
+                print(id, 'deleted !')
+                return True
+            else:
+                return False
+        else:
+            n = self.nodes.pop()
+            n[1].join()
+            return True
+
+    def replace_node(self, id=None, shutdown=False, last_msg_stats=None):
+        random.shuffle(self.nodes)
+        deleted = self.end_node(id=id, shutdown=shutdown, last_msg_stats=last_msg_stats)
+        if deleted:
+            self.launch_node()
+
+    def resize(self, n):
+        n = min(n, 500)
+        l = len(self.nodes)
+        if n == l:
+            return
+        if n > l:
+            print("Launching", n-l, "nodes", self.ip4, self.ip6)
+            for i in range(l, n):
+                self.launch_node()
+        else:
+            print("Ending", l-n, "nodes", self.ip4, self.ip6)
+            #random.shuffle(self.nodes)
+            for i in range(n, l):
+                self.end_node()
+
+    def close(self):
+    	self.resize(0)
+
+    def getMessageStats(self):
+        stats = np.array([0,0,0,0,0])
+        for n in self.nodes:
+            stats +=  np.array(n[1].getNodeMessageStats())
+        stats_list = [len(self.nodes)]
+        stats_list.extend(stats.tolist())
+        return stats_list
+
+class ClusterShell(cmd.Cmd):
+    intro = 'Welcome to the OpenDHT node cluster control. Type help or ? to list commands.\n'
+    prompt = '>> '
+    net = None
+    def __init__(self, network):
+        super(ClusterShell, self).__init__()
+        net = network
+    def do_exit(self, arg):
+        self.close()
+        return True
+    def close(self):
+        if self.net:
+            self.net.close()
+            self.net = None
+
+if __name__ == '__main__':
+    import argparse
+    from urllib.parse import urlparse
+    net = None
+    try:
+        parser = argparse.ArgumentParser(description='Create a dht network of -n nodes')
+        parser.add_argument('-n', '--node-num', help='number of dht nodes to run', type=int, default=32)
+        parser.add_argument('-I', '--iface', help='local interface to bind', default='any')
+        parser.add_argument('-p', '--port', help='start of port range (port, port+node_num)', type=int, default=4000)
+        parser.add_argument('-b', '--bootstrap', help='bootstrap address')
+        parser.add_argument('-d', '--daemonize', help='daemonize process', action='store_true')
+        parser.add_argument('-l', '--log', help='log file prefix')
+        args = parser.parse_args()
+
+        if args.bootstrap:
+            args.bootstrap = urlparse('dht://'+args.bootstrap)
+
+        net = NodeCluster(iface=args.iface, port=args.port, bootstrap=args.bootstrap, logfile=args.log)
+        net.resize(args.node_num)
+        if args.daemonize:
+            import daemon
+            with daemon.DaemonContext():
+                while True:
+                    time.sleep(2)
+        else:
+            ClusterShell(net).cmdloop()
+    except Exception as e:
+        traceback.print_tb(e.__traceback__)
+        print(type(e).__name__+':', e, file=sys.stderr)
+    finally:
+        if net:
+            net.resize(0)