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#! /usr/bin/env python
# encoding: utf-8
# Thomas Nagy, 2015 (ita)
"""
Execute commands through pre-forked servers. This tool creates as many servers as build threads.
On a benchmark executed on Linux Kubuntu 14, 8 virtual cores and SSD drive::
./genbench.py /tmp/build 200 100 15 5
waf clean build -j24
# no prefork: 2m7.179s
# prefork: 0m55.400s
To use::
def options(opt):
# optional, will spawn 40 servers early
opt.load('prefork')
def build(bld):
bld.load('prefork')
...
more code
The servers and the build process are using a shared nonce to prevent undesirable external connections.
"""
import os, re, socket, threading, sys, subprocess, time, atexit, traceback, random, signal
try:
import SocketServer
except ImportError:
import socketserver as SocketServer
try:
from queue import Queue
except ImportError:
from Queue import Queue
try:
import cPickle
except ImportError:
import pickle as cPickle
SHARED_KEY = None
HEADER_SIZE = 64
REQ = 'REQ'
RES = 'RES'
BYE = 'BYE'
def make_header(params, cookie=''):
header = ','.join(params)
header = header.ljust(HEADER_SIZE - len(cookie))
assert(len(header) == HEADER_SIZE - len(cookie))
header = header + cookie
if sys.hexversion > 0x3000000:
header = header.encode('iso8859-1')
return header
def safe_compare(x, y):
sum = 0
for (a, b) in zip(x, y):
sum |= ord(a) ^ ord(b)
return sum == 0
re_valid_query = re.compile('^[a-zA-Z0-9_, ]+$')
class req(SocketServer.StreamRequestHandler):
def handle(self):
try:
while self.process_command():
pass
except KeyboardInterrupt:
return
except Exception as e:
print(e)
def send_response(self, ret, out, err, exc):
if out or err or exc:
data = (out, err, exc)
data = cPickle.dumps(data, -1)
else:
data = ''
params = [RES, str(ret), str(len(data))]
# no need for the cookie in the response
self.wfile.write(make_header(params))
if data:
self.wfile.write(data)
self.wfile.flush()
def process_command(self):
query = self.rfile.read(HEADER_SIZE)
if not query:
return None
#print(len(query))
assert(len(query) == HEADER_SIZE)
if sys.hexversion > 0x3000000:
query = query.decode('iso8859-1')
# magic cookie
key = query[-20:]
if not safe_compare(key, SHARED_KEY):
print('%r %r' % (key, SHARED_KEY))
self.send_response(-1, '', '', 'Invalid key given!')
return 'meh'
query = query[:-20]
#print "%r" % query
if not re_valid_query.match(query):
self.send_response(-1, '', '', 'Invalid query %r' % query)
raise ValueError('Invalid query %r' % query)
query = query.strip().split(',')
if query[0] == REQ:
self.run_command(query[1:])
elif query[0] == BYE:
raise ValueError('Exit')
else:
raise ValueError('Invalid query %r' % query)
return 'ok'
def run_command(self, query):
size = int(query[0])
data = self.rfile.read(size)
assert(len(data) == size)
kw = cPickle.loads(data)
# run command
ret = out = err = exc = None
cmd = kw['cmd']
del kw['cmd']
#print(cmd)
try:
if kw['stdout'] or kw['stderr']:
p = subprocess.Popen(cmd, **kw)
(out, err) = p.communicate()
ret = p.returncode
else:
ret = subprocess.Popen(cmd, **kw).wait()
except KeyboardInterrupt:
raise
except Exception as e:
ret = -1
exc = str(e) + traceback.format_exc()
self.send_response(ret, out, err, exc)
def create_server(conn, cls):
# child processes do not need the key, so we remove it from the OS environment
global SHARED_KEY
SHARED_KEY = os.environ['SHARED_KEY']
os.environ['SHARED_KEY'] = ''
ppid = int(os.environ['PREFORKPID'])
def reap():
if os.sep != '/':
os.waitpid(ppid, 0)
else:
while 1:
try:
os.kill(ppid, 0)
except OSError:
break
else:
time.sleep(1)
os.kill(os.getpid(), signal.SIGKILL)
t = threading.Thread(target=reap)
t.setDaemon(True)
t.start()
server = SocketServer.TCPServer(conn, req)
print(server.server_address[1])
sys.stdout.flush()
#server.timeout = 6000 # seconds
server.socket.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
try:
server.serve_forever(poll_interval=0.001)
except KeyboardInterrupt:
pass
if __name__ == '__main__':
conn = ("127.0.0.1", 0)
#print("listening - %r %r\n" % conn)
create_server(conn, req)
else:
from waflib import Logs, Utils, Runner, Errors, Options
def init_task_pool(self):
# lazy creation, and set a common pool for all task consumers
pool = self.pool = []
for i in range(self.numjobs):
consumer = Runner.get_pool()
pool.append(consumer)
consumer.idx = i
self.ready = Queue(0)
def setq(consumer):
consumer.ready = self.ready
try:
threading.current_thread().idx = consumer.idx
except Exception as e:
print(e)
for x in pool:
x.ready.put(setq)
return pool
Runner.Parallel.init_task_pool = init_task_pool
def make_server(bld, idx):
cmd = [sys.executable, os.path.abspath(__file__)]
proc = subprocess.Popen(cmd, stdout=subprocess.PIPE)
return proc
def make_conn(bld, srv):
port = srv.port
conn = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
conn.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
conn.connect(('127.0.0.1', port))
return conn
SERVERS = []
CONNS = []
def close_all():
global SERVERS, CONNS
while CONNS:
conn = CONNS.pop()
try:
conn.close()
except:
pass
while SERVERS:
srv = SERVERS.pop()
try:
srv.kill()
except:
pass
atexit.register(close_all)
def put_data(conn, data):
cnt = 0
while cnt < len(data):
sent = conn.send(data[cnt:])
if sent == 0:
raise RuntimeError('connection ended')
cnt += sent
def read_data(conn, siz):
cnt = 0
buf = []
while cnt < siz:
data = conn.recv(min(siz - cnt, 1024))
if not data:
raise RuntimeError('connection ended %r %r' % (cnt, siz))
buf.append(data)
cnt += len(data)
if sys.hexversion > 0x3000000:
ret = ''.encode('iso8859-1').join(buf)
else:
ret = ''.join(buf)
return ret
def exec_command(self, cmd, **kw):
if 'stdout' in kw:
if kw['stdout'] not in (None, subprocess.PIPE):
return self.exec_command_old(cmd, **kw)
elif 'stderr' in kw:
if kw['stderr'] not in (None, subprocess.PIPE):
return self.exec_command_old(cmd, **kw)
kw['shell'] = isinstance(cmd, str)
Logs.debug('runner: %r' % cmd)
Logs.debug('runner_env: kw=%s' % kw)
if self.logger:
self.logger.info(cmd)
if 'stdout' not in kw:
kw['stdout'] = subprocess.PIPE
if 'stderr' not in kw:
kw['stderr'] = subprocess.PIPE
if Logs.verbose and not kw['shell'] and not Utils.check_exe(cmd[0]):
raise Errors.WafError("Program %s not found!" % cmd[0])
idx = threading.current_thread().idx
kw['cmd'] = cmd
# serialization..
#print("sub %r %r" % (idx, cmd))
#print("write to %r %r" % (idx, cmd))
data = cPickle.dumps(kw, -1)
params = [REQ, str(len(data))]
header = make_header(params, self.SHARED_KEY)
conn = CONNS[idx]
put_data(conn, header + data)
#put_data(conn, data)
#print("running %r %r" % (idx, cmd))
#print("read from %r %r" % (idx, cmd))
data = read_data(conn, HEADER_SIZE)
if sys.hexversion > 0x3000000:
data = data.decode('iso8859-1')
#print("received %r" % data)
lst = data.split(',')
ret = int(lst[1])
dlen = int(lst[2])
out = err = None
if dlen:
data = read_data(conn, dlen)
(out, err, exc) = cPickle.loads(data)
if exc:
raise Errors.WafError('Execution failure: %s' % exc)
if out:
if not isinstance(out, str):
out = out.decode(sys.stdout.encoding or 'iso8859-1')
if self.logger:
self.logger.debug('out: %s' % out)
else:
Logs.info(out, extra={'stream':sys.stdout, 'c1': ''})
if err:
if not isinstance(err, str):
err = err.decode(sys.stdout.encoding or 'iso8859-1')
if self.logger:
self.logger.error('err: %s' % err)
else:
Logs.info(err, extra={'stream':sys.stderr, 'c1': ''})
return ret
def init_key(ctx):
try:
key = ctx.SHARED_KEY = os.environ['SHARED_KEY']
except KeyError:
key = "".join([chr(random.SystemRandom().randint(40, 126)) for x in range(20)])
os.environ['SHARED_KEY'] = ctx.SHARED_KEY = key
os.environ['PREFORKPID'] = str(os.getpid())
return key
def init_servers(ctx, maxval):
while len(SERVERS) < maxval:
i = len(SERVERS)
srv = make_server(ctx, i)
SERVERS.append(srv)
while len(CONNS) < maxval:
i = len(CONNS)
srv = SERVERS[i]
# postpone the connection
srv.port = int(srv.stdout.readline())
conn = None
for x in range(30):
try:
conn = make_conn(ctx, srv)
break
except socket.error:
time.sleep(0.01)
if not conn:
raise ValueError('Could not start the server!')
if srv.poll() is not None:
Logs.warn('Looks like it it not our server process - concurrent builds are unsupported at this stage')
raise ValueError('Could not start the server')
CONNS.append(conn)
def init_smp(self):
if not getattr(Options.options, 'smp', getattr(self, 'smp', None)):
return
if Utils.unversioned_sys_platform() in ('freebsd',):
pid = os.getpid()
cmd = ['cpuset', '-l', '0', '-p', str(pid)]
elif Utils.unversioned_sys_platform() in ('linux',):
pid = os.getpid()
cmd = ['taskset', '-pc', '0', str(pid)]
if cmd:
self.cmd_and_log(cmd, quiet=0)
def options(opt):
init_key(opt)
init_servers(opt, 40)
opt.add_option('--pin-process', action='store_true', dest='smp', default=False)
def build(bld):
if bld.cmd == 'clean':
return
init_key(bld)
init_servers(bld, bld.jobs)
init_smp(bld)
bld.__class__.exec_command_old = bld.__class__.exec_command
bld.__class__.exec_command = exec_command
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