Devices infrastructure and minimal server

starts and creates (server-side) devices
no daemonizing and servicing yet

hint: try starting:
$ bin/server.py -v start

Change-Id: I6ac7a78dfff309a459cc0338a8d0d319ee72ada5

bin/server.py

@@ -25,8 +25,83 @@ import os
 import sys
 from os import path
 
-sys.path[0]=path.abspath(path.join(sys.path[0],'../src'))
+# Pathes magic to make python find out stuff.
+# also remember our basepath (for etc, pid lookup, etc)
+basepath = path.abspath(path.join(sys.path[0], '..'))
+etc_path = path.join(basepath, 'etc')
+pid_path = path.join(basepath, 'pid')
+log_path = path.join(basepath, 'log')
+sys.path[0] = path.join(basepath, 'src')
 
-import transport
 
-transport.startup_server()
+import argparse
+from lib import check_pidfile, start_server, kill_server
+
+parser = argparse.ArgumentParser(description = "Manage a SECoP server")
+loggroup = parser.add_mutually_exclusive_group()
+loggroup.add_argument("-v", "--verbose", help="Output lots of diagnostic information", 
+                    action='store_true', default=False)
+loggroup.add_argument("-q", "--quiet", help="suppress non-error messages", action='store_true',
+                    default=False)
+parser.add_argument("action", help="What to do with the server: (re)start, status or stop",
+                    choices=['start', 'status', 'stop', 'restart'], default="status")
+parser.add_argument("name", help="Name of the instance. Uses etc/name.cfg for configuration\n"
+                    "may be omitted to mean ALL (which are configured)",
+                    nargs='?', default='')
+args = parser.parse_args()
+
+
+import logging
+loglevel =  logging.DEBUG if args.verbose else (logging.ERROR if args.quiet else logging.INFO)
+logging.basicConfig(level=loglevel, format='%(asctime)s %(levelname)s %(message)s')
+logger = logging.getLogger('server')
+logger.setLevel(loglevel)
+fh = logging.FileHandler(path.join(log_path, 'server.log'), 'w')
+fh.setLevel(loglevel)
+logger.addHandler(fh)
+
+logger.debug("action specified %r" % args.action)
+
+def handle_servername(name, action):
+    pidfile = path.join(pid_path, name + '.pid')
+    cfgfile = path.join(etc_path, name + '.cfg')
+    if action == "restart":
+        handle_servername(name, 'stop')
+        handle_servername(name, 'start')
+        return
+    elif action == "start":
+        logger.info("Starting server %s" % name)
+        # XXX also do it !
+        start_server(name, basepath, loglevel)
+    elif action == "stop":
+        pid = check_pidfile(pidfile)
+        if pid:
+            logger.info("Stopping server %s" % name)
+            # XXX also do it!
+            stop_server(pidfile)
+        else:
+            logger.info("Server %s already dead" % name)
+    elif action == "status":
+        if check_pidfile(pidfile):
+            logger.info("Server %s is running." % name)
+        else:
+            logger.info("Server %s is DEAD!" % name)
+    else:
+        logger.error("invalid action specified: How can this ever happen???")
+
+print "================================"
+if not args.name:
+    logger.debug("No name given, iterating over all specified servers")
+    for dirpath, dirs, files in os.walk(etc_path):
+        for fn in files:
+            if fn.endswith('.cfg'):
+                handle_servername(fn[:-4], args.action)
+            else:
+                logger.debug('configfile with strange extension found: %r' 
+                             % path.basename(fn))
+        # ignore subdirs!
+        while(dirs):
+            dirs.pop()
+else:
+    handle_servername(args.name, args.action)
+print "================================"