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spm_manager.py
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spm_manager.py
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import gpio_pin
import logging
import os
import psutil
import RPi.GPIO as gpio
import time
from messaging import EventDrivenMessageProcessor
from spm_conn import SPMConn
log = logging.getLogger(__name__)
# Message processor
edmp = EventDrivenMessageProcessor("spm", default_hooks={"handler": "query"})
# SPM connection
conn = SPMConn()
context = {
"state": None
}
@edmp.register_hook()
def query_handler(cmd, **kwargs):
"""
Queries a given SPM command.
Arguments:
- cmd (str): The SPM command to query.
"""
ret = {
"_type": cmd.lower(),
}
try:
func = getattr(conn, cmd)
except AttributeError:
ret["error"] = "Unsupported command: {:s}".format(cmd)
return ret
res = func(**kwargs)
if res != None:
if isinstance(res, dict):
ret.update(res)
else:
ret["value"] = res
return ret
@edmp.register_hook()
def heartbeat_handler():
"""
Triggers SPM heartbeat and fires power on event when booting.
"""
try:
# Check if not in state on
if context["state"] != "on":
# Get current status
res = conn.status()
old_state = context["state"]
new_state = res["last_state"]["up"]
# On first time only
if old_state == None:
# Trigger last off state event if last boot time is found
try:
boot_time = __salt__["rpi.boot_time"]().get("value", None)
if boot_time == None:
log.warning("Last boot time could not be determined")
else:
# Last boot time is considered identical to last power off time because of 'fake-hwclock'
edmp.trigger_event({
"timestamp": boot_time
}, "system/power/last_off")
except:
log.exception("Failed to trigger last system off event")
# Trigger recover state event
if res["last_trigger"]["down"] not in ["none", "rpi"]:
edmp.trigger_event({
"trigger": res["last_trigger"]["down"]
}, "system/power/recover")
# Check if state has changed
if old_state != new_state:
context["state"] = new_state
# Trigger state event
edmp.trigger_event({
"trigger": res["last_trigger"]["up"]
}, "system/power/{:}{:}".format("_" if new_state in ["booting"] else "", new_state))
finally:
# Trigger heartbeat as normal
conn.noop()
@edmp.register_hook()
def flash_firmware_handler(hex_file, no_write=True):
"""
Flashes new SPM firmware to ATtiny.
"""
ret = {}
gpio.setmode(gpio.BOARD)
gpio.setup(gpio_pin.HOLD_PWR, gpio.OUT)
try:
log.info("Setting GPIO output pin {:} high".format(gpio_pin.HOLD_PWR))
gpio.output(gpio_pin.HOLD_PWR, gpio.HIGH)
params = ["avrdude", "-p t24", "-c autopi", "-U flash:w:{:s}".format(hex_file)]
if no_write:
params.append("-n")
res = __salt__["cmd.run_all"](" ".join(params))
if res["retcode"] == 0:
ret["output"] = res["stderr"]
else:
ret["error"] = res["stderr"]
ret["output"] = res["stdout"]
if not no_write:
log.info("Flashed firmware release '{:}'".format(hex_file))
finally:
log.info("Sleeping for 5 secs to give ATtiny time to recover")
time.sleep(5)
log.info("Setting GPIO output pin {:} low".format(gpio_pin.HOLD_PWR))
gpio.output(gpio_pin.HOLD_PWR, gpio.LOW)
# Re-setup SPM connection
conn.setup()
return ret
def start(workers, **kwargs):
try:
log.debug("Starting SPM manager")
# Give process higher priority
psutil.Process(os.getpid()).nice(-1)
# Setting up SPM connection
conn.setup()
# Initialize and run message processor
edmp.init(__salt__, __opts__, workers=workers)
edmp.run()
except Exception:
log.exception("Failed to start SPM manager")
raise
finally:
log.info("Stopping SPM manager")