forked from Deuxfleurs/mknet
init
This commit is contained in:
commit
6ca16fc624
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@ -0,0 +1,46 @@
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links:
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- &100
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bandwidth: 100M
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latency: 2ms
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- &1000
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bandwidth: 1000M
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latency: 1ms
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- &vdsl
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bandwidth:
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up: 3M
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down: 55M
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latency: 50ms
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jitter: 10ms
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- &fiber
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bandwidth: 400M
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latency: 10ms
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jitter: 3ms
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zones:
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- &dc1
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name: dc1
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internal: *100
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external: *vdsl
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- &dc2
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name: dc2
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internal: *1000
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external: *fiber
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servers:
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- name: dc1s1
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zone: *dc1
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- name: dc1s2
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zone: *dc1
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- name: dc2s1
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zone: *dc2
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- name: dc2s2
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zone: *dc2
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- name: no_dc
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<<: *vdsl
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global:
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subnet:
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base: 172.24.0.0
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local: 8
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zone: 8
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latency-offset: 3ms
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#!/bin/env python
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import ipaddress
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import os
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import shutil
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import subprocess
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import sys
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import yaml
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from pyroute2 import NDB, netns
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class SubnetManager:
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def __init__(self, config):
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self.base = config['base']
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self.zone_size = config['zone']
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self.local_size = config['local']
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if ipaddress.ip_address(self.base).version == 6:
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self.prefix = 128 - self.zone_size - self.local_size
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else:
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self.prefix = 32 - self.zone_size - self.local_size
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self.networks = ipaddress.ip_network((self.base, self.prefix)).subnets(self.zone_size)
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self.current_net = next(self.networks).hosts()
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def next_local(self):
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return next(self.current_net)
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def next_zone(self):
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self.current_net = next(self.networks).hosts()
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def __str__(self):
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return f'SubnetManager{{base: {self.base}, zone: {self.zone_size}, local: {self.local_size}}}'
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class Latency:
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def __init__(self, latency, offset = None):
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if type(latency) is int:
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self.latency_ms = latency
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else:
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for suffix, factor in [("ms", 1), ("s", 1000), ("m", 60 * 1000)]:
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if latency.endswith(suffix):
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self.latency_ms = int(float(latency[:-len(suffix)]) * factor)
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break
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else:
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self.latency_ms = int(latency)
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if offset:
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self.latency_ms -= Latency(offset).latency_ms
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if self.latency_ms < 0:
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self.latency_ms = 0
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def __eq__(self, o):
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return isinstance(o, Latency) and o.latency_ms == self.latency_ms
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def __str__(self):
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return f'{self.latency_ms}ms'
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class Bandwidth:
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def __init__(self, bw):
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def convert(bw):
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factor = 1
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for suffix, f in [("bit", 1), ("bps",1), ("b", 1), ("byte", 8), ("Byte",8), ("B", 8)]:
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if bw.endswith(suffix):
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bw = bw[:-len(suffix)]
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factor = f
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break
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for suffix, f in [("k", 1000), ("ki", 1024), ("m", 1000**2), ("mi", 1024**2), ("g", 1000**3), ("gi", 1024**3)]:
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if bw.lower().endswith(suffix):
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return int(float(bw[:-len(suffix)]) * factor * f)
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else:
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return int(float(bw) * factor)
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if type(bw) is dict:
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self.down = convert(bw["down"])
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self.up = convert(bw["up"])
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else:
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self.down = convert(bw)
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self.up = convert(bw)
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def __str__(self):
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def convert(bw):
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for suffix, factor in [("g", 1000**3), ("m", 1000**2), ("k", 1000)]:
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if bw > 10 * factor:
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return f'{bw/factor:.1f}{suffix}bps'
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return f'{convert(self.down)}/{convert(self.up)}'
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def __eq__(self, o):
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return (isinstance(o, Bandwidth) and
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o.down == self.down and
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o.up == self.up)
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class LinkInfo:
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def __init__(self, bandwidth, latency, jitter = None, offset = None, **kwargs):
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self.bandwidth = Bandwidth(bandwidth)
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self.latency = Latency(latency, offset)
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self.jitter = Latency(jitter or 0)
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def __eq__(self, o):
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return (isinstance(o, LinkInfo) and
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o.bandwidth == self.bandwidth and
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o.latency == self.latency and
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o.jitter == self.jitter)
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def __str__(self):
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return f'LinkInfo{{bw: {self.bandwidth}, latency: {self.latency}, jitter: {self.jitter}}}'
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class Server:
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def __init__(self, name, link):
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self.ip = None
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self.name = name
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self.link = link
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def is_zone(self):
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return False
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def __str__(self):
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return f'Server{{name: {self.name}, ip: {self.ip}, link: {self.link}}}'
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def __repr__(self):
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return self.__str__()
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class Zone:
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def __init__(self, name):
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self.name = name
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self.link = None
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self.servers = {}
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def is_zone(self):
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return True
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def add_server(self, server):
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if self.servers.get(server.name) is None:
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self.servers[server.name] = server
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else:
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raise Exception(f"Duplicate server '{server.name}' in zone '{self.name}'")
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def set_link(self, link):
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if self.link is None:
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self.link = link
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elif self.link != link:
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raise Exception(f"Uncoherent link configuration for zone '{self.name}'")
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def __str__(self):
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return f'Zone{{name: {self.name}, link: {self.link}, servers: {list(self.servers.values())}}}'
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def __repr__(self):
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return self.__str__()
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class Network:
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def __init__(self):
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self.zones = {}
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self.subnet_manager = None
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self.latency_off = Latency(0)
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def set_subnet_manager(self, subnet):
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self.subnet_manager = SubnetManager(subnet)
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def set_latency_offset(self, latency_off):
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self.latency_off = latency_off
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def add_server(self, server):
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name = server["name"]
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if zone_obj := server.get("zone"):
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zone_name = zone_obj["name"]
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if zone := self.zones.get(zone_name):
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if not zone.is_zone():
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raise Exception("Duplicate zone: " + name)
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else:
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zone = Zone(zone_name)
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self.zones[zone_name] = zone
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if link:=zone_obj.get("external"):
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zone.set_link(LinkInfo(offset = self.latency_off, **link))
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zone.add_server(Server(name, LinkInfo(**zone_obj["internal"])))
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else:
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name = name
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if name in self.zones:
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raise Exception("Duplicate zone: " + name)
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self.zones[name] = Server(name, LinkInfo(offset = self.latency_off, **server))
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def assign_ips(self):
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for zone in self.zones.values():
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if zone.is_zone():
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for server in zone.servers.values():
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server.ip = self.subnet_manager.next_local()
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else:
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zone.ip = self.subnet_manager.next_local()
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self.subnet_manager.next_zone()
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def __str__(self):
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return f'Network{{subnet_manager: {self.subnet_manager}, zones: {list(self.zones.values())}, latency_offset: {self.latency_off}}}'
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class NamespaceManager:
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def __init__(self):
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self.ndb = NDB(log='debug')
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self.namespaces = set()
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def make_namespace(self, name):
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if not name in self.namespaces:
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self.namespaces.add(name)
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self.ndb.sources.add(netns=name)
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def make_bridge(self, name, namespace):
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self.make_namespace(namespace)
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return (self.ndb.interfaces.create(ifname=name, kind='bridge', target=namespace)
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.set('state', 'up'))
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def make_veth(self, name1, name2, space1, space2, ip, link):
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self.make_namespace(space1)
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self.make_namespace(space2)
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veth = (self.ndb.interfaces.create(ifname=name1, target=space1, kind='veth',
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peer={'ifname': name2, 'net_ns_fd': space2})
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.set('state', 'up'))
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if ip:
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veth.add_ip(address=str(ip), prefixlen=self.prefixlen)
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veth.commit()
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#NSPopen(space1, ['tc', 'qdisc', 'add', 'dev', nam1, 'root', 'netem', 'delay', '1000ms', '0ms'])
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#add the other way too
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def build_network(self, network):
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self.prefixlen = network.subnet_manager.prefix
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netns = "testnet-core"
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bridge = self.make_bridge("br0", netns)
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for zone in network.zones.values():
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if zone.is_zone():
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self.build_zone(zone)
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else:
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self.build_server(zone)
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bridge.add_port({'ifname': 'veth-' + zone.name, 'target': netns})
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bridge.commit()
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def build_zone(self, zone):
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netns = "testnet-" + zone.name
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bridge = self.make_bridge("br-" + zone.name, netns)
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self.make_veth("veth-" + zone.name, "veth-" + zone.name, netns, "testnet-core", None, zone.link)
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bridge.add_port({'ifname': 'veth-' + zone.name, 'target': netns})
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for server in zone.servers.values():
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self.build_server(server, zone)
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bridge.add_port({'ifname': 'veth-' + server.name, 'target': netns})
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bridge.commit()
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def build_server(self, server, zone = None):
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if zone:
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zone_name = "testnet-" + zone.name
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else:
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zone_name = "testnet-core"
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namespace = zone_name + "-" + server.name
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self.make_veth("veth", "veth-" + server.name, namespace, zone_name, server.ip, server.link)
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def close(self):
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self.ndb.close()
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def parse(yaml):
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server_list = yaml["servers"]
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global_conf = yaml.get("global", {})
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subnet = global_conf.get("subnet", {'base': 'fc00:9a7a:9e::', 'local': 64, 'zone': 16})
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latency_offset = global_conf.get("latency-offset", 0)
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network = Network()
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network.set_subnet_manager(subnet)
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network.set_latency_offset(latency_offset)
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for server in server_list:
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network.add_server(server)
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network.assign_ips()
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return network
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def create(config_path):
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with open(config_path, "r") as file:
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config = yaml.safe_load(file)
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shutil.copy(config_path, ".current_state.yml")
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network = parse(config)
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nsm = NamespaceManager()
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nsm.build_network(network)
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nsm.close()
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def run(netns, cmd):
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if ":" in netns:
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zone_name,host = netns.split(":", 1)
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else:
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zone_name,host = None, netns
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with open(".current_state.yml", "r") as file:
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config = yaml.safe_load(file)
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zones = parse(config).zones
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server = None
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zone = None
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if zone_name:
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if (zone := zones.get(zone_name)) and zone.is_zone():
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server = zone.servers.get(host)
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elif (zone := zones.get(host)) and not zone.is_zone():
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server = zone
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else:
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for z in zones.values():
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if not z.is_zone(): continue
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if (s := z.servers.get(host)):
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if server:
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raise Exception("Multiple matching host found.")
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server = s
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zone = z
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if not server:
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raise Exception("No matching host was found")
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env = os.environ.copy()
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env["HOST"] = server.name
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if zone.is_zone():
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env["ZONE"] = zone.name
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env["IP"] = str(server.ip)
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name = f'testnet-{zone.name}-{server.name}'
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if len(cmd) == 0:
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cmd = [os.getenv("SHELL") or "/bin/sh"]
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os.execve("/bin/env", ["/bin/env", "ip", "netns" , "exec", name ] + cmd, env)
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def destroy():
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for ns in netns.listnetns():
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if ns.startswith("testnet-"):
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subprocess.run(f"ip netns pids {ns} | xargs -r kill", check=True, shell=True)
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netns.remove(ns)
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os.remove(".current_state.yml")
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if __name__ == "__main__":
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if len(sys.argv) < 2:
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print("""Usage:
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mk-testnet create [config_path] # create a new network. config_path defailt to config.yml
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mk-testnet run-all <cmd> [args...] # run a command as each host. set the IP, NAME and ZONE environment variables
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mk-testnet run <name> [cmd [args...]] # run command in host named <name>. Use zonename:name if multiple zones hosts server with same name. If cmd is empty, run a shell
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mk-testnet destroy # destroy the current environment""")
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exit()
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cmd = sys.argv[1]
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if cmd == "create":
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create(sys.argv[2] if len(sys.argv) > 2 else "config.yml")
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elif cmd == "run-all":
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runall(sys.argv[2:])
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elif cmd == "run":
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run(sys.argv[2], sys.argv[3:])
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elif cmd == "destroy":
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destroy()
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else:
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raise Exception(f"Unknown command: {cmd}")
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