#!/usr/bin/python3
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import requests
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import json
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from time import sleep
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import uuid
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import subprocess
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import os
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import shutil
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import signal
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import sys
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import socket
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from threading import Thread, Event
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def get_hostname():
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return socket.gethostname()
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def get_ip():
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return ((([ip for ip in socket.gethostbyname_ex(socket.gethostname())[2] if not ip.startswith("127.")] or [[(s.connect(("8.8.8.8", 53)), s.getsockname()[0], s.close()) for s in [socket.socket(socket.AF_INET, socket.SOCK_DGRAM)]][0][1]]) + ["no IP found"])[0])
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def get_client_id(addr, my_ip, my_hostname, subrun):
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client_auth={'ip':my_ip,'hostname':my_hostname, 'subrun':subrun}
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response=requests.post(addr+"/api/register/", data=client_auth)
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if(response.status_code==200):
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client_data=json.loads(response.text)
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client_id=client_data['id']
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return client_id
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else:
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raise ValueError
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def get_run(addr,cid):
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response=requests.get(addr+"/api/getrun/"+str(cid)+"/")
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if(response.status_code==200):
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client_data=json.loads(response.text)
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rid=client_data['id']
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tape=client_data['tape']
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vtu=client_data['lastVTU']
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status=client_data['status']
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return (rid,tape,vtu,status)
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else:
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print(response.text)
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if(response.status_code==400):
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raise ValueError
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else:
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raise NameError
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def ping_run(addr,cid, rid):
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client_data={'client_id':cid, 'run_id':rid}
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response=requests.post(addr+"/api/ping/", data=client_data)
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if(response.status_code==200):
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return
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else:
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raise ValueError
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def client_ping(addr,cid):
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client_data={'client_id':cid}
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response=requests.post(addr+"/api/pingclient/", data=client_data)
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if(response.status_code==200):
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client_data=json.loads(response.text)
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return
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else:
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raise ValueError
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def send_error_report(addr,cid, rid,errcode):
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client_data={'client_id':cid, 'run_id':rid, 'error_code':errcode}
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response=requests.post(addr+"/api/reporterr/", data=client_data)
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if(response.status_code==200):
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return
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else:
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raise ValueError
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def upload(addr,cid, rid, vtu, status):
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client_data={'client_id': cid, 'run_id': rid, 'lastVTU': vtu, 'status': status}
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response=requests.post(addr+"/api/upload/", data=client_data)
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if(response.status_code==200):
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return
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else:
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raise ValueError
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def getNewVTU(directory):
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fset=set()
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for file in os.listdir(directory):
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if file.endswith(".vtu") and file.startswith("timestep_"):
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fset.add(file)
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return fset
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def removeDir(directory):
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os.chdir('/')
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try:
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shutil.rmtree(directory)
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except:
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print("Cannot remove directory "+directory+ "\n")
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return
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class ClientThread(Thread):
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def __init__(self,conn_address='http://beti.trisurf.eu',subid=0, update_seconds=100):
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super(ClientThread,self).__init__()
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self._stop_event = Event()
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self._stop_event.clear()
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self.p=None
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self.workingdir=None
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self.conn_address=conn_address
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self.id=subid
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self.ip=get_ip()
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self.hostname=get_hostname()
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self.update_seconds=update_seconds
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self.max_client_ping_time_elapsed=250
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def stop(self):
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self._stop_event.set()
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def isStopped(self):
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return self._stop_event.is_set()
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def join(self):
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print('joining threads')
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super(ClientThread, self).join()
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if self.p is not None:
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self.p.terminate()
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if self.workingdir is not None:
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removeDir(self.workingdir.fullpath())
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def sleep(self,s):
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for i in range(0, s):
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if(self.isStopped()):
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return False
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sleep(1)
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return True
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def run(self):
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while(not self.isStopped()): #try to register
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try:
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cid=get_client_id(self.conn_address, self.ip, self.hostname, self.id)
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except:
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print("[{}] Could not get CID.".format(self.id))
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self.sleep(10)
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continue
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#print("Got CID. getting RID.")
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client_ping_time_elapsed=0
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while(not self.isStopped()): #successfully registered, now start pinging and searching for job
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try:
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(rid,tape,vtu,status)=get_run(self.conn_address,cid)
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except NameError:
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print("[{}] Could not get RID.".format(self.id))
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self.sleep(10)
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client_ping_time_elapsed+=10
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if(client_ping_time_elapsed>=self.max_client_ping_time_elapsed):
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try:
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client_ping(self.conn_address,cid)
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except:
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break
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client_ping_time_elapsed=0
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#if you put break instead of continue, there is no need to ping client. And it is more robust...
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continue
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except ValueError:
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print("[{}] Wrong CID? Getting new CID.".format(self.id))
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#self.sleep(10)
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break
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except:
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print("[{}] Cannot connect. Server down? Retrying....".format(self.id))
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break
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else:
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#start separate thread with simulations.
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self.workingdir=Directory('/tmp/ts_'+str(uuid.uuid4()))
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self.workingdir.makeifnotexist()
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self.workingdir.goto()
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with open(self.workingdir.fullpath()+"/tape", 'w') as f:
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f.write(tape)
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if(int(status)==-1):
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cmd=['trisurf', '--force-from-tape']
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print("[{}] Run id={} :: Starting from tape.".format(self.id, rid))
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else:
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with open(self.workingdir.fullpath()+"/.status",'w') as f:
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f.write(status)
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with open(self.workingdir.fullpath()+"/initial.vtu",'w') as f:
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f.write(vtu)
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cmd=['trisurf', '--restore-from-vtk', 'initial.vtu']
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print("[{}] Run id={} :: Restoring from vtk, last timestep {}".format(self.id,rid,status))
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self.p=subprocess.Popen(cmd, stdout=subprocess.DEVNULL)
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s=int(status)
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while(not self.isStopped()):
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#monitor for new file. If file is present, upload it!
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newVTU=getNewVTU(self.workingdir.fullpath())
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if newVTU: #upload
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try:
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for nv in sorted(newVTU):
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with open(nv,'r') as f:
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fc=f.read()
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s=s+1
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print('[{}] Uploading {}.'.format(self.id,nv))
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upload(self.conn_address, cid, rid, fc, s)
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os.unlink(nv)
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except:
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print("[{}] Could not upload".format(self.id))
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self.p.terminate()
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removeDir(self.workingdir.fullpath())
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self.p=None
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self.workingdir=None
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break
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else:
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print("[{}] VTU uploaded.".format(self.id))
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else: #ping
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try:
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ping_run(self.conn_address, cid, rid)
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except:
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print("[{}] Could not ping.".format(self.id))
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self.p.terminate()
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self.p=None
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removeDir(self.workingdir.fullpath())
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self.workingdir=None
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#stop simulations
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break
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#check if trisurf is still running. If not break the innermost loop.
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sleep(1)
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if(self.p.poll() is not None): # trisurf exited!
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print("[{}] Trisurf was stopped with return code {}".format(self.id, self.p.returncode))
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if(self.p.returncode>0):
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try:
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send_error_report(self.conn_address, cid, rid, self.p.returncode)
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except:
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print("[{}] Server didn't accept error report".format(self.id))
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removeDir(self.workingdir.fullpath())
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self.workingdir=None
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self.p=None
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break
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self.sleep(self.update_seconds-1)
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client_ping_time_elapsed+=self.update_seconds
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if(client_ping_time_elapsed>self.max_client_ping_time_elapsed-self.update_seconds/2):
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client_ping(self.conn_address,cid)
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client_ping_time_elapsed=0
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#Stolen from trisurf library... Therefore, this client is not dependent on the installation of the library.
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class Directory:
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'''
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Class deals with the paths where the simulation is run and data is stored.
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'''
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def __init__(self, maindir=".", simdir=""):
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'''Initialization Directory() takes two optional parameters, namely maindir and simdir. Defaults to current directory. It sets local variables maindir and simdir accordingly.'''
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self.maindir=maindir
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self.simdir=simdir
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return
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def fullpath(self):
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'''
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Method returns string of path where the data is stored. It combines values of maindir and simdir as maindir/simdir on Unix.
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'''
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return os.path.join(self.maindir,self.simdir)
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def exists(self):
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''' Method checks whether the directory specified by fullpath() exists. It return True/False on completion.'''
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path=self.fullpath()
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if(os.path.exists(path)):
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return True
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else:
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return False
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def make(self):
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''' Method make() creates directory. If it fails it exits the program with error message.'''
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try:
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os.makedirs(self.fullpath())
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except:
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print("Cannot make directory "+self.fullpath()+"\n")
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exit(1)
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return
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def makeifnotexist(self):
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'''Method makeifnotexist() creates directory if it does not exist.'''
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if(self.exists()==0):
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self.make()
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return True
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else:
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return False
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def remove(self):
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'''Method remove() removes directory recursively. WARNING! No questions asked.'''
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if(self.exists()):
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try:
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os.rmdir(self.fullpath())
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except:
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print("Cannot remove directory "+self.fullpath()+ "\n")
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exit(1)
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return
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def goto(self):
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'''
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Method goto() moves current directory to the one specified by fullpath(). WARNING: when using the relative paths, do not call this function multiple times.
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'''
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try:
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os.chdir(self.fullpath())
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except:
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print("Cannot go to directory "+self.fullpath()+"\n")
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return
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#--- SIGINT and SIGTERM HANDLING ---
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def signal_handler(signal,frame):
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t.stop()
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t.join()
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print("Process ended with signal " +str(signal))
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sys.exit(signal)
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#--- END SIGINT and SIGTERM----
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if __name__ == '__main__':
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signal.signal(signal.SIGINT, signal_handler)
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signal.signal(signal.SIGTERM, signal_handler)
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t=ClientThread(update_seconds=100)
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t.start()
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#t.join()
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#print("main")
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while(True):
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sleep(1000)
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