def event(reason, version_info):
"""!
State machine event loop. The three possible states are:
1. initial
2. disconnected
3. connected
The graphical FSM may look like: ___
| |(resend_event)
___|___|________
____________ init_connect_timeout | |
| | ------------------------->| disconnected |
| initial |-------------------------->|______________|
|__________| (wdt_trigger) | |
| | | (wdt_trigger)
| (wdt_trigger) | |
| _|__________|__
| wdt_connect | |
|--------------------------->| connected |
|_____________|
| |
|___| (resend_event)
"""
global g_curr_wdt_state
mgmtd_pids = []
old_wdt_state = g_curr_wdt_state
new_wdt_state = None
mgmtd_pids = Vsp.get_pids('mgmtd')
if mgmtd_pids == None or g_mgmtd_pid not in mgmtd_pids:
Logging.log(Logging.LOG_ERR, "Unexpected termination of mgmtd, kill watchdog!")
sys.exit()
#
# wish python had switch statement, that would make it more pretty.
#
# Based on the current state, call appropriate state handler function,
# this function based on given input check if state needs to be changed,
# if yes, then would take required action as well (send event).
if g_curr_wdt_state in STATE_HANDLER_DICT.keys():
new_wdt_state = \
STATE_HANDLER_DICT[g_curr_wdt_state](reason, version_info)
else:
# unknown state detected, KILL ME !!!!
error_str = "Unknown state: %s, reset to initial" % g_curr_wdt_state
Logging.log(Logging.LOG_ERR, error_str)
sys.exit()
if old_wdt_state != new_wdt_state:
set_state(new_wdt_state, reason, version_info)
else:
# No state change detected. Verify if we need to resend event.
check_resend_event(reason, version_info)
def main():
"""!
Entry point to the watchdog. Initialize logger and starts attempting to
communicate with ESXi
"""
global g_mgmtd_pid
g_mgmtd_pid = None
mgmtd_pids = []
Logging.log_init('esxi_watchdog', 'esxi_watchdog', 0,
Logging.component_id(Logging.LCI_VSP), Logging.LOG_DEBUG,
Logging.LOG_LOCAL0, Logging.LCT_SYSLOG)
Logging.log(Logging.LOG_INFO, "esxi watchdog started")
# Bug 117274: It may happen that we get multiple pids for mgmtd process,
# pidof ran between fork-exec call, retry to allow mgmtd to settle
for i in range(1, MAX_MGMTD_SETTLE_RETRY):
mgmtd_pids = Vsp.get_pids('mgmtd')
if len(mgmtd_pids) > 1:
# multiple pids detected, give mgmtd sometime to settle
time.sleep(MGMTD_SETTLE_TIMEOUT)
else:
g_mgmtd_pid = mgmtd_pids[0]
break
# Bug 112192: monitor mgmtd pid, if mgmtd crashes/exits
# terminate watchdog as well
if g_mgmtd_pid == None:
# mgmtd not up kill watchdog process
Logging.log(Logging.LOG_ERR, "Mgmtd is not ready, kill watchdog!")
sys.exit();
Mgmt.open()
signal.signal(signal.SIGINT, terminate_handler)
signal.signal(signal.SIGTERM, terminate_handler)
signal.signal(signal.SIGQUIT, terminate_handler)
# Invalidate the session file if it exists on startup
if os.path.exists(SESSION_FILE):
os.remove(SESSION_FILE)
monitor_esxi()
Mgmt.close()
