Changes between Initial Version and Version 1 of epics/streamdevice/simFG

Timestamp:

02/25/25 09:01:51 (8 months ago)

Author:

Tetsuya Michikawa

Comment:

--

epics/streamdevice/simFG

@@ +1 @@
+= EPICS講習会で使用しているテスト用の simulator (simFG) =
+
+KEKで何度か開催されている[https://cerldev.kek.jp/trac/EpicsUsersJP/#EPICS%E5%85%A5%E9%96%80%E8%AC%9B%E7%BF%92%E4%BC%9A%E8%B3%87%E6%96%99%E3%81%AA%E3%81%A9 EPICS講習会]のstream deviceで使用してる simFG のソースコードです。
+
+ご自由にお使いください。
+
+{{{
+#!/usr/bin/python
+import socketserver
+import string
+import sys
+import time
+import signal
+import random
+import math
+import traceback
+import re
+
+HOST = ''
+PORT = 9999
+
+class EchoHandler(socketserver.BaseRequestHandler):
+  def handle(self):
+    self.t0 = time.time()
+    print(time.ctime(self.t0), "  Connected from ", self.client_address)
+
+    # constant
+    self.freq = 0.2   # frequency
+    self.amp  = 5.0   # ammplitude
+    self.offset = 0.0 # offset
+
+    # inner command functions
+    def _getIDN():
+      return "Simulator"
+
+    def _getVolt():
+      return self.creRetStr()
+
+    def _getAmp():
+      return '%f' % self.amp
+
+    def _getFreq():
+      return '%f' % self.freq
+
+    def _getOffset():
+      return '%f' % self.offset
+
+    def _getStat():
+      return '%f,%f,%f' %(self.amp, self.freq, self.offset)
+
+    def _getInfo():
+      return 'AMP:%f,FREQ:%f,OFFSET:%f' %(self.amp, self.freq, self.offset)
+
+    def _setAmp(buf):
+      val = self.checkarg(buf)
+      if val:
+        self.amp = val
+
+    def _setFreq(buf):
+      val = self.checkarg(buf)
+      if val:
+        self.freq = val
+
+    def _setOffset(buf):
+      val = self.checkarg(buf)
+      if val:
+        self.offset = val
+
+
+    # commands dictionary
+    cmnds = {
+      'QUIT'  :{'set':None,             'qry':None},
+      '*IDN'  :{'set':None,             'qry':_getIDN},
+      'VOLT'  :{'set':None,             'qry':_getVolt},
+      'AMP'   :{'set':_setAmp,          'qry':_getAmp},
+      'FREQ'  :{'set':_setFreq,         'qry':_getFreq},
+      'OFFSET':{'set':_setOffset,       'qry':_getOffset},
+      'STAT'  :{'set':None,             'qry':_getStat},
+      'INFO'  :{'set':None,             'qry':_getInfo}
+    }
+
+
+    flag = True
+    fid = self.request.makefile()
+    while flag:
+        receivedData = fid.readline()
+        if not receivedData: break
+        try:
+          # buf = string.strip(receivedData)
+          buf = receivedData.strip()
+          # sparate command string
+          # comd = string.upper(re.split('[ ?]', buf)[0])
+          comd = re.split('[ ?]', buf)[0].upper()
+          if len(comd) >=3:
+            rtn = None
+            # if cmnds.has_key(comd):
+            if comd in cmnds.keys():
+              cmndDic = cmnds[comd]
+              # "QUIT" is special command
+              if comd == "QUIT":
+                flag = False
+              else:
+                if buf[len(comd)] == '?':
+                  if cmndDic['qry'] != None:
+                    rtn = cmndDic['qry']() + '\r\n'
+                    rtn = rtn.encode()
+                else:
+                  if cmndDic['set'] != None:
+                    cmndDic['set'](buf)
+
+            if rtn != None:
+              self.request.send(rtn)
+        except:
+          traceback.print_exc()
+          pass
+
+    fid.close()
+    self.request.close()
+    print(time.ctime(time.time()), "  Disconnected (from ", self.client_address, ")")
+
+  def checkarg(self, buf):
+    try:
+      c,v = buf.strip().split()
+      val = float(v)
+    except:
+      #traceback.print_exc()
+      val = None
+    return val
+
+  def creRetStr(self):
+    #random.seed()
+    t = time.time() - self.t0
+    val = self.amp * math.sin(2*math.pi*self.freq*t) + random.random()*1.0 + self.offset
+    #buf = "A=%8.4f, B=%8.4f, C=%8.4f"%(val,val,val2*2.345)
+    buf = "%8.4f"%val
+    return buf
+
+# end of class EchoHandler
+
+def signal_handler(signal, frame):
+  sys.exit(0)
+
+# __ main __
+if __name__ == '__main__':
+  signal.signal(signal.SIGINT, signal_handler)
+  socketserver.ForkingTCPServer.allow_reuse_address = True
+  srv = socketserver.ForkingTCPServer((HOST,PORT), EchoHandler)
+  print("StreamDevice Simulator started.")
+  srv.serve_forever()
+}}}