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"""
This file is part of pycos project. See https://pycos.sourceforge.io for details.
"""
import sys
import os
import threading
import json
import cgi
import time
import socket
import ssl
import re
import traceback
import pycos
from pycos.dispycos import DispycosStatus, DispycosNodeAvailInfo
import pycos.dispycos as dispycos
if sys.version_info.major > 2:
import http.server as BaseHTTPServer
from urllib.parse import urlparse
else:
import BaseHTTPServer
from urlparse import urlparse
__author__ = "Giridhar Pemmasani (pgiri@yahoo.com)"
__email__ = "pgiri@yahoo.com"
__copyright__ = "Copyright 2015, Giridhar Pemmasani"
__contributors__ = []
__maintainer__ = "Giridhar Pemmasani (pgiri@yahoo.com)"
__license__ = "Apache 2.0"
__url__ = "https://pycos.sourceforge.io"
__all__ = ['HTTPServer']
if sys.version_info.major >= 3:
def dict_iter(arg, iterator):
return getattr(arg, iterator)()
else:
def dict_iter(arg, iterator):
return getattr(arg, 'iter' + iterator)()
class HTTPServer(object):
NodeStatus = {dispycos.Scheduler.NodeDiscovered: 'Discovered',
dispycos.Scheduler.NodeInitialized: 'Initialized',
dispycos.Scheduler.NodeClosed: 'Closed',
dispycos.Scheduler.NodeIgnore: 'Ignore',
dispycos.Scheduler.NodeDisconnected: 'Disconnected',
dispycos.Scheduler.NodeSuspended: 'Suspended',
dispycos.Scheduler.NodeResumed: 'Initialized'}
ServerStatus = {dispycos.Scheduler.ServerDiscovered: 'Discovered',
dispycos.Scheduler.ServerInitialized: 'Initialized',
dispycos.Scheduler.ServerClosed: 'Closed',
dispycos.Scheduler.ServerIgnore: 'Ignore',
dispycos.Scheduler.ServerDisconnected: 'Disconnected',
dispycos.Scheduler.ServerSuspended: 'Suspended',
dispycos.Scheduler.ServerResumed: 'Initialized'}
ip_re = re.compile(r'^((\d+\.\d+\.\d+\.\d+)|([0-9a-f:]+))$')
loc_re = re.compile(r'^((\d+\.\d+\.\d+\.\d+)|([0-9a-f:]+)):(\d+)$')
class _Node(object):
def __init__(self, name, addr):
self.name = name
self.addr = addr
self.status = None
self.servers = {}
self.update_time = time.time()
self.tasks_submitted = 0
self.tasks_done = 0
self.avail_info = None
class _Server(object):
def __init__(self, location):
self.location = location
self.status = None
self.tasks = {}
self.tasks_submitted = 0
self.tasks_done = 0
class _HTTPRequestHandler(BaseHTTPServer.BaseHTTPRequestHandler):
def __init__(self, ctx, DocumentRoot, *args):
self._ctx = ctx
self.DocumentRoot = DocumentRoot
BaseHTTPServer.BaseHTTPRequestHandler.__init__(self, *args)
def log_message(self, fmt, *args):
# pycos.logger.debug('HTTP client %s: %s', self.client_address[0], fmt % args)
return
@staticmethod
def json_encode_nodes(arg):
nodes = [dict(node.__dict__) for node in dict_iter(arg, 'values')]
for node in nodes:
node['servers'] = len(node['servers'])
node['avail_info'] = node['avail_info'].__dict__
return nodes
def do_GET(self):
client_request = self.path[1:]
if client_request == 'cluster_updates':
self._ctx._lock.acquire()
nodes = self.__class__.json_encode_nodes(self._ctx._updates)
self._ctx._updates.clear()
self._ctx._lock.release()
self.send_response(200)
self.send_header('Content-Type', 'application/json; charset=utf-8')
self.end_headers()
self.wfile.write(json.dumps(nodes).encode())
return
elif client_request == 'cluster_status':
self._ctx._lock.acquire()
nodes = self.__class__.json_encode_nodes(self._ctx._nodes)
self._ctx._lock.release()
self.send_response(200)
self.send_header('Content-Type', 'application/json; charset=utf-8')
self.end_headers()
self.wfile.write(json.dumps(nodes).encode())
return
else:
path = urlparse(client_request).path
if not path or path == 'index.html':
path = 'cluster.html'
path = os.path.join(self.DocumentRoot, path)
try:
with open(path) as fd:
data = fd.read()
if path.endswith('.html'):
if path.endswith('.html'):
data = data % {'TIMEOUT': str(self._ctx._poll_sec),
'SHOW_TASK_ARGS': 'true' if self._ctx._show_args
else 'false'}
content_type = 'text/html'
elif path.endswith('.js'):
content_type = 'text/javascript'
elif path.endswith('.css'):
content_type = 'text/css'
elif path.endswith('.ico'):
content_type = 'image/x-icon'
self.send_response(200)
self.send_header('Content-Type', content_type)
if content_type == 'text/css' or content_type == 'text/javascript':
self.send_header('Cache-Control', 'private, max-age=86400')
self.end_headers()
self.wfile.write(data.encode())
return
except Exception:
pycos.logger.warning('HTTP client %s: Could not read/send "%s"',
self.client_address[0], path)
pycos.logger.debug(traceback.format_exc())
self.send_error(404)
return
pycos.logger.debug('Bad GET request from %s: %s',
self.client_address[0], client_request)
self.send_error(400)
return
def do_POST(self):
form = cgi.FieldStorage(fp=self.rfile, headers=self.headers,
environ={'REQUEST_METHOD': 'POST'})
client_request = self.path[1:]
if client_request == 'server_info':
server = None
max_tasks = 0
for item in form.list:
if item.name == 'location':
m = re.match(HTTPServer.loc_re, item.value)
if m:
node = self._ctx._nodes.get(m.group(1))
if node:
server = node.servers.get(item.value)
elif item.name == 'limit':
try:
max_tasks = int(item.value)
except Exception:
pass
if server:
if 0 < max_tasks < len(server.tasks):
rtasks = []
for i, rtask in enumerate(dict_iter(server.tasks, 'values')):
if i >= max_tasks:
break
rtasks.append(rtask)
else:
rtasks = server.tasks.values()
show_args = self._ctx._show_args
rtasks = [{'task': str(rtask.task), 'name': rtask.task.name,
'args': ', '.join(str(arg) for arg in rtask.args)
if show_args else '',
'kwargs': ', '.join('%s=%s' % (key, val)
for key, val in rtask.kwargs.items())
if show_args else '',
'start_time': rtask.start_time
} for rtask in rtasks]
info = {'location': str(server.location),
'status': server.status, 'tasks_submitted': server.tasks_submitted,
'tasks_done': server.tasks_done, 'tasks': rtasks,
'update_time': node.update_time}
else:
info = {}
self.send_response(200)
self.send_header('Content-Type', 'application/json; charset=utf-8')
self.end_headers()
self.wfile.write(json.dumps(info).encode())
return
elif client_request == 'node_info':
addr = None
for item in form.list:
if item.name == 'host':
if re.match(HTTPServer.ip_re, item.value):
addr = item.value
else:
try:
info = socket.getaddrinfo(item.value, None)[0]
ip_addr = info[4][0]
if info[0] == socket.AF_INET6:
ip_addr = re.sub(r'^0+', '', ip_addr)
ip_addr = re.sub(r':0+', ':', ip_addr)
ip_addr = re.sub(r'::+', '::', ip_addr)
addr = ip_addr
except Exception:
addr = item.value
break
node = self._ctx._nodes.get(addr)
if node:
info = {'addr': node.addr, 'name': node.name,
'status': node.status, 'update_time': node.update_time,
'avail_info': node.avail_info.__dict__,
'tasks_submitted': node.tasks_submitted, 'tasks_done': node.tasks_done,
'servers': [
{'location': str(server.location),
'tasks_submitted': server.tasks_submitted,
'tasks_done': server.tasks_done,
'tasks_running': len(server.tasks),
'update_time': node.update_time
} for server in node.servers.values()
]
}
else:
info = {}
self.send_response(200)
self.send_header('Content-Type', 'application/json; charset=utf-8')
self.end_headers()
self.wfile.write(json.dumps(info).encode())
return
elif client_request == 'terminate_tasks':
tasks = []
for item in form.list:
if item.name == 'task':
try:
tasks.append(item.value)
except ValueError:
pycos.logger.debug('Terminate: task "%s" is invalid', item.value)
terminated = []
self._ctx._lock.acquire()
for task in tasks:
s = task.split('@')
if len(s) != 2:
continue
location = s[1]
s = location.split(':')
if len(s) != 2:
continue
node = self._ctx._nodes.get(s[0])
if not node:
continue
server = node.servers.get(location)
if not server:
continue
rtask = server.tasks.get(task)
if rtask and rtask.task.terminate() == 0:
terminated.append(task)
self._ctx._lock.release()
self.send_response(200)
self.send_header('Content-Type', 'application/json; charset=utf-8')
self.end_headers()
self.wfile.write(json.dumps(terminated).encode())
return
elif client_request == 'update':
for item in form.list:
if item.name == 'timeout':
try:
timeout = int(item.value)
if timeout < 1:
timeout = 0
self._ctx._poll_sec = timeout
except Exception:
pycos.logger.warning('HTTP client %s: invalid timeout "%s" ignored',
self.client_address[0], item.value)
elif item.name == 'show_task_args':
if item.value == 'true':
self._ctx._show_args = True
else:
self._ctx._show_args = False
self.send_response(200)
self.send_header('Content-Type', 'text/html')
self.end_headers()
return
elif (client_request == 'suspend_node' or client_request == 'resume_node'):
method = getattr(self._ctx.computation, client_request)
if not method:
return
nodes = []
for item in form.list:
if item.name == 'nodes':
nodes = json.loads(item.value)
break
for node in nodes:
method(node)
return
elif (client_request == 'suspend_server' or client_request == 'resume_server'):
method = getattr(self._ctx.computation, client_request)
if not method:
return
servers = []
for item in form.list:
if item.name == 'servers':
servers = json.loads(item.value)
break
for loc in servers:
loc = loc.split(':')
if len(loc) != 2:
continue
try:
loc = pycos.Location(loc[0], loc[1])
except Exception:
continue
method(loc)
return
else:
pycos.logger.debug('Bad POST request from %s: %s',
self.client_address[0], client_request)
self.send_error(400)
return
def __init__(self, computation, host='', port=8181, poll_sec=10, DocumentRoot=None,
keyfile=None, certfile=None, show_task_args=True):
self._lock = threading.Lock()
if not DocumentRoot:
DocumentRoot = os.path.join(os.path.dirname(__file__), 'data')
self._nodes = {}
self._updates = {}
if poll_sec < 1:
pycos.logger.warning('invalid poll_sec value %s; it must be at least 1', poll_sec)
poll_sec = 1
self._poll_sec = poll_sec
self._show_args = bool(show_task_args)
self._server = BaseHTTPServer.HTTPServer((host, port), lambda *args:
HTTPServer._HTTPRequestHandler(self, DocumentRoot, *args))
if certfile:
self._server.socket = ssl.wrap_socket(self._server.socket, keyfile=keyfile,
certfile=certfile, server_side=True)
self._httpd_thread = threading.Thread(target=self._server.serve_forever)
self._httpd_thread.daemon = True
self._httpd_thread.start()
self.computation = computation
self.status_task = pycos.SysTask(self.status_proc)
if computation.status_task:
client_task = computation.status_task
def chain_msgs(task=None):
task.set_daemon()
while 1:
msg = yield task.receive()
self.status_task.send(msg)
client_task.send(msg)
computation.status_task = pycos.SysTask(chain_msgs)
else:
computation.status_task = self.status_task
pycos.logger.info('Started HTTP%s server at %s',
's' if certfile else '', str(self._server.socket.getsockname()))
def status_proc(self, task=None):
task.set_daemon()
while True:
msg = yield task.receive()
if isinstance(msg, pycos.MonitorException):
rtask = msg.args[0]
node = self._nodes.get(rtask.location.addr)
if node:
server = node.servers.get(str(rtask.location))
if server:
if server.tasks.pop(str(rtask), None) is not None:
server.tasks_done += 1
node.tasks_done += 1
node.update_time = time.time()
self._updates[node.addr] = node
elif isinstance(msg, DispycosStatus):
if msg.status == dispycos.Scheduler.TaskCreated:
rtask = msg.info
node = self._nodes.get(rtask.task.location.addr)
if node:
server = node.servers.get(str(rtask.task.location))
if server:
server.tasks[str(rtask.task)] = rtask
server.tasks_submitted += 1
node.tasks_submitted += 1
node.update_time = time.time()
self._updates[node.addr] = node
elif (msg.status == dispycos.Scheduler.ServerInitialized or
msg.status == dispycos.Scheduler.ServerResumed):
node = self._nodes.get(msg.info.addr)
if node:
server = node.servers.get(str(msg.info), None)
if not server:
server = HTTPServer._Server(msg.info)
node.servers[str(server.location)] = server
server.status = HTTPServer.ServerStatus[msg.status]
node.update_time = time.time()
self._updates[node.addr] = node
elif (msg.status == dispycos.Scheduler.ServerClosed or
msg.status == dispycos.Scheduler.ServerDisconnected or
msg.status == dispycos.Scheduler.ServerSuspended):
node = self._nodes.get(msg.info.addr)
if node:
server = node.servers.get(str(msg.info), None)
if server:
server.status = HTTPServer.ServerStatus[msg.status]
node.update_time = time.time()
self._updates[node.addr] = node
elif (msg.status == dispycos.Scheduler.NodeInitialized or
msg.status == dispycos.Scheduler.NodeResumed):
node = self._nodes.get(msg.info.addr)
if not node:
node = HTTPServer._Node(msg.info.name, msg.info.addr)
node.avail_info = msg.info.avail_info
node.avail_info.location = None
self._nodes[msg.info.addr] = node
node.status = HTTPServer.NodeStatus[msg.status]
node.update_time = time.time()
self._updates[node.addr] = node
elif (msg.status == dispycos.Scheduler.NodeClosed or
msg.status == dispycos.Scheduler.NodeDisconnected or
msg.status == dispycos.Scheduler.NodeSuspended):
node = self._nodes.get(msg.info.addr)
if node:
node.status = HTTPServer.NodeStatus[msg.status]
node.update_time = time.time()
self._updates[node.addr] = node
elif isinstance(msg, DispycosNodeAvailInfo):
node = self._nodes.get(msg.location.addr, None)
if node:
node.avail_info = msg
node.avail_info.location = None
node.update_time = time.time()
self._updates[node.addr] = node
else:
pycos.logger.warning('Status message ignored: %s', type(msg))
def shutdown(self, wait=True):
"""This method should be called by user program to close the
http server. If 'wait' is True the server waits for poll_sec
so the http client gets all the updates before server is
closed.
"""
if wait:
pycos.logger.info('HTTP server waiting for %s seconds for client updates '
'before quitting', self._poll_sec)
if pycos.Pycos().cur_task():
def _shutdown(task=None):
yield task.sleep(self._poll_sec + 0.5)
self._server.shutdown()
self._server.server_close()
pycos.SysTask(_shutdown)
else:
time.sleep(self._poll_sec + 0.5)
self._server.shutdown()
self._server.server_close()
else:
self._server.shutdown()
self._server.server_close()
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