From aaa7e979c638abda805a1458022676f812056bbf Mon Sep 17 00:00:00 2001
From: Stephen Soltesz <soltesz@cs.princeton.edu>
Date: Thu, 12 Mar 2009 17:33:06 +0000
Subject: [PATCH] move command.py from monitor module into pcucontrol module.
pcucontrol should be self-contained.
---
pcucontrol/util/command.py | 240 +++++++++++++++++++++++++++++++++++++
1 file changed, 240 insertions(+)
create mode 100644 pcucontrol/util/command.py
diff --git a/pcucontrol/util/command.py b/pcucontrol/util/command.py
new file mode 100644
index 0000000..e5663c3
--- /dev/null
+++ b/pcucontrol/util/command.py
@@ -0,0 +1,240 @@
+import os
+from select import select
+import subprocess
+import signal
+import time
+import traceback
+import fcntl
+
+DEBUG= 0
+
+class ExceptionTimeout(Exception): pass
+class ExceptionReadTimeout(Exception): pass
+COMMAND_TIMEOUT = 60
+ssh_options = { 'StrictHostKeyChecking':'no',
+ 'BatchMode':'yes',
+ 'PasswordAuthentication':'no',
+ 'ConnectTimeout':'%s' % COMMAND_TIMEOUT}
+
+class Sopen(subprocess.Popen):
+ def kill(self, sig = signal.SIGTERM):
+ try:
+ # NOTE: this also kills parent... so doesn't work like I want.
+ # NOTE: adding 'exec' before the cmd removes the extra sh, and
+ # partially addresses this problem.
+ #os.killpg(os.getpgid(self.pid), signal.SIGKILL)
+ os.kill(self.pid, sig)
+ except OSError:
+ # no such process, due to it already exiting...
+ pass
+
+
+def read_t(stream, count=1, timeout=COMMAND_TIMEOUT*2):
+ if count == 1:
+ retstr = ""
+
+ while True:
+ lin, lout, lerr = select([stream], [], [], timeout)
+ if len(lin) == 0:
+ print "timeout!"
+ raise ExceptionReadTimeout("TIMEOUT reading from command")
+
+ try:
+ outbytes = stream.read(count)
+ except IOError, err:
+ print 'no content yet.'
+ # due to no content.
+ # the select timeout should catch this.
+ continue
+
+ if not outbytes:
+ break
+ retstr += outbytes
+
+ return retstr
+ else:
+ lin, lout, lerr = select([stream], [], [], timeout)
+ if len(lin) == 0:
+ raise ExceptionReadTimeout("TIMEOUT reading from command")
+
+ return stream.read(count)
+
+class CMD:
+ def __init__(self):
+ pass
+
+ def run_noexcept(self, cmd, timeout=COMMAND_TIMEOUT*2):
+
+ try:
+ return CMD.run(self,cmd,timeout)
+ except ExceptionTimeout:
+ print traceback.print_exc()
+ return ("", "ScriptTimeout")
+ except ExceptionReadTimeout:
+ print traceback.print_exc()
+ return ("", "RunningScriptTimeout")
+ except Exception, err:
+ from monitor.common import email_exception
+ email_exception()
+ return ("", str(err))
+
+ def system(self, cmd, timeout=COMMAND_TIMEOUT*2):
+ (o,e) = self.run(cmd, timeout)
+ self.output = o
+ self.error = e
+ if self.s.returncode is None:
+ self.s.wait()
+ return self.s.returncode
+
+ def run(self, cmd, timeout=COMMAND_TIMEOUT*2):
+
+ s = Sopen(cmd, shell=True, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE, close_fds=True)
+ self.s = s
+ (f_in, f_out, f_err) = (s.stdin, s.stdout, s.stderr)
+ lout, lin, lerr = select([f_out], [], [f_err], timeout)
+ if len(lin) == 0 and len(lout) == 0 and len(lerr) == 0:
+ # Reached a timeout! Nuke process so it does not hang.
+ print "TIMEOUT!!!!!!!!!!!!!!!!!!!"
+ s.kill(signal.SIGKILL)
+ raise ExceptionTimeout("TIMEOUT Running: %s" % cmd)
+ else:
+ #print "RETURNING"
+ #print len(lin), len(lout), len(lerr)
+ pass
+
+ o_value = ""
+ e_value = ""
+
+ #o_value = f_out.read()
+ flags = fcntl.fcntl(f_out, fcntl.F_GETFL)
+ fcntl.fcntl(f_out, fcntl.F_SETFL, flags | os.O_NONBLOCK)
+
+ try:
+ o_value = read_t(f_out,1,30)
+ except ExceptionReadTimeout:
+ s.kill(signal.SIGKILL)
+ raise ExceptionReadTimeout("TIMEOUT: failed to read from cmd: %s" % cmd)
+
+ e_value = f_err.read()
+
+ o_value = o_value.strip()
+ e_value = e_value.strip()
+
+ f_out.close()
+ f_in.close()
+ f_err.close()
+ s.kill(signal.SIGKILL)
+
+ return (o_value, e_value)
+
+ def runargs(self, args, timeout=COMMAND_TIMEOUT*2):
+
+ #print "CMD.run(%s)" % " ".join(args)
+ s = Sopen(args, shell=True, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE, close_fds=True)
+ self.s = s
+ (f_in, f_out, f_err) = (s.stdin, s.stdout, s.stderr)
+ lout, lin, lerr = select([f_out], [], [f_err], timeout)
+ if len(lin) == 0 and len(lout) == 0 and len(lerr) == 0:
+ # Reached a timeout! Nuke process so it does not hang.
+ s.kill(signal.SIGKILL)
+ raise ExceptionTimeout("TIMEOUT Running: %s" % cmd)
+ o_value = f_out.read()
+ e_value = ""
+ if o_value == "": # An error has occured
+ e_value = f_err.read()
+
+ o_value = o_value.strip()
+ e_value = e_value.strip()
+
+ f_out.close()
+ f_in.close()
+ f_err.close()
+ s.kill(signal.SIGKILL)
+
+ return (o_value, e_value)
+
+
+class SSH(CMD):
+ def __init__(self, user, host, port=22, options = ssh_options):
+ self.options = options
+ self.user = user
+ self.host = host
+ self.port = port
+ return
+
+ def __options_to_str(self):
+ options = ""
+ for o,v in self.options.iteritems():
+ options = options + "-o %s=%s " % (o,v)
+ return options
+
+ def run(self, cmd, timeout=COMMAND_TIMEOUT*2):
+ cmd = "ssh -p %s %s %s@%s '%s'" % (self.port, self.__options_to_str(),
+ self.user, self.host, cmd)
+ #print "SSH.run(%s)" % cmd
+ return CMD.run(self, cmd, timeout)
+
+ def get_file(self, rmt_filename, local_filename=None):
+ if local_filename == None:
+ local_filename = "./"
+ cmd = "scp -P %s -B %s %s@%s:%s %s" % (self.port, self.__options_to_str(),
+ self.user, self.host,
+ rmt_filename, local_filename)
+ # output :
+ # errors will be on stderr,
+ # success will have a blank stderr...
+ return CMD.run_noexcept(self, cmd)
+
+ def run_noexcept(self, cmd):
+ cmd = "ssh -p %s %s %s@%s '%s'" % (self.port, self.__options_to_str(),
+ self.user, self.host, cmd)
+ #print "SSH.run_noexcept(%s)" % cmd
+ return CMD.run_noexcept(self, cmd)
+
+ def run_noexcept2(self, cmd, timeout=COMMAND_TIMEOUT*2):
+ cmd = "exec ssh -p %s %s %s@%s %s" % (self.port, self.__options_to_str(),
+ self.user, self.host, cmd)
+ r = CMD.run_noexcept(self, cmd, timeout)
+ self.ret = -1
+
+ return r
+
+ def system2(self, cmd, timeout=COMMAND_TIMEOUT*2):
+ cmd = "ssh -p %s %s %s@%s %s" % (self.port, self.__options_to_str(),
+ self.user, self.host, cmd)
+ #print "SSH.system2(%s)" % cmd
+ return CMD.system(self, cmd, timeout)
+
+ def runE(self, cmd):
+ cmd = "ssh -p %s %s %s@%s '%s'" % (self.port, self.__options_to_str(),
+ self.user, self.host, cmd)
+ if ( DEBUG == 1 ):
+ print cmd,
+ (f_in, f_out, f_err) = os.popen3(cmd)
+
+ value = f_out.read()
+ if value == "": # An error has occured
+ value = f_err.read()
+ value = value.strip()
+
+ if ( DEBUG == 1 ):
+ print " == %s" % value
+ f_out.close()
+ f_in.close()
+ f_err.close()
+ return value.strip()
+
+class MyTimer:
+ def __init__(self):
+ self.start = time.time()
+
+ def end(self):
+ self.end = time.time()
+ t = self.end-self.start
+ return t
+
+ def diff(self):
+ self.end = time.time()
+ t = self.end-self.start
+ self.start = self.end
+ return t
--
2.47.0