feat: re-add per-run sud log alongside the continuous server log

SudLogTask reuses ServerLogTask's sample format but only records while
a Sud run is active: starts on Play (fresh start only, not a Pause
resume) and writes logs/log_{date_time}_{sud_name}.log on Stop or
natural completion.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TvgC7oy9MxaA4ZQxXqkNdS

server/brewpi.py

@@ -15,7 +15,7 @@ from components.plant import PlantFactory
 from components.actor import StirrerFactory
 from components.sud import Sud
 from components.sud_forecast import SudForecastEstimator
-from tasks import TaskManager, TempSensorTask, HeaterTask, PotTask, TcTask, StirrerTask, SudTask, ServerLogTask
+from tasks import TaskManager, TempSensorTask, HeaterTask, PotTask, TcTask, StirrerTask, SudTask, ServerLogTask, SudLogTask
 
 import argparse as ap
 
@@ -133,21 +133,31 @@ if __name__ == '__main__':
 	# Continuous server-session log - records from startup to shutdown
 	# regardless of Sud state; written to logs/log_{date_time}.json on exit.
 	server_log_task = ServerLogTask(tc, heater, heater_task, DT_TASK, args.logdir, config=config, dt=DT)
-	sud_task.set_on_plant_params(server_log_task.log_plant_params)
 	if startup_params is not None:
 		server_log_task.log_plant_params(0, startup_params)
 	taskmgr.add(server_log_task)
 
+	# Per-run log - only records while a Sud is actually playing; written to
+	# logs/log_{date_time}_{sud_name}.log on Stop (or natural completion).
+	sud_log_task = SudLogTask(tc, heater, heater_task, sud, DT_TASK, args.logdir, config=config, dt=DT)
+	taskmgr.add(sud_log_task)
+
+	sud_task.set_on_plant_params(lambda elapsed, params: (
+		server_log_task.log_plant_params(elapsed, params),
+		sud_log_task.log_plant_params(elapsed, params)))
+
 	# Assign data flow
 	# Assign tc control value to heater
 	tc.set_on_changed("y", heater_task.actor)
 	# HeaterTask owns TC enable: enabled in closed-loop mode, disabled in open-loop.
 	heater_task.set_on_closed_loop_changed(tc.set_enabled)
 	# Brew start: switch heater to closed-loop so the TC drives it regardless
-	# of which client (browser, PyQt GUI, …) started the brew.
-	sud_task.set_on_start(heater_task.start_closed_loop)
-	# Brew end (DONE/IDLE): shut heater off and broadcast open-loop/power-0 to clients.
-	sud_task.set_on_end(heater_task.shutdown)
+	# of which client (browser, PyQt GUI, …) started the brew; also (re)starts
+	# the per-run sud log (a Pause->resume Start is a no-op for the log).
+	sud_task.set_on_start(lambda: (heater_task.start_closed_loop(), sud_log_task.start_run()))
+	# Brew end (DONE/IDLE): shut heater off, broadcast open-loop/power-0 to
+	# clients, and write out the per-run sud log.
+	sud_task.set_on_end(lambda: (heater_task.shutdown(), sud_log_task.stop_run()))
 
 	# Assign temp. sensor readings to tc
 	sensor_task.set_on_changed("temp", ChangedFloat(tc.set_theta_ist, prec=2).set)

tasks/__init__.py

@@ -6,3 +6,4 @@ from tasks.pot import PotTask
 from tasks.tempctrl import TcTask
 from tasks.sud import SudTask
 from tasks.server_log import ServerLogTask
+from tasks.sud_log import SudLogTask

tasks/server_log.py

@@ -34,8 +34,16 @@ class ServerLogTask(ATask):
 
 	async def on_process(self):
 		while True:
+			if self._should_sample():
+				self._samples.append(self._take_sample())
+			await asyncio.sleep(self.interval)
+
+	def _should_sample(self):
+		return True
+
+	def _take_sample(self):
 		power_set = max(self.heater_task.power_soll, self.heater_task.power_actor)
-			self._samples.append({
+		return {
 			't':         time.monotonic() - self._t0,
 			'timestamp': time.time(),
 			'temp_ist':  self.tc.theta_ist,
@@ -44,14 +52,16 @@ class ServerLogTask(ATask):
 			'rate_soll': self.tc.heatrate_soll,
 			'power_set': power_set,
 			'power_eff': self.heater.power_eff,
-			})
-			await asyncio.sleep(self.interval)
+		}
+
+	def _filename(self):
+		return 'log_{}.json'.format(self._run_id)
 
 	def write(self):
 		if not self._samples:
 			return
 		os.makedirs(self.path, exist_ok=True)
-		filename = 'log_{}.json'.format(self._run_id)
+		filename = self._filename()
 		path = os.path.join(self.path, filename)
 		log_data = {'Name': ''}
 		if self.dt is not None:

tasks/sud_log.py

@@ -0,0 +1,42 @@
+import time
+from tasks.server_log import ServerLogTask
+from components import APid, AHeater
+
+
+def _safe_filename_part(text):
+	return "".join(c if c.isalnum() or c in "-_" else "_" for c in text) or "Sud"
+
+
+class SudLogTask(ServerLogTask):
+	"""Records temp/power samples for a single Sud run - same sample format
+	as ServerLogTask, but only while a run is active: recording starts on
+	Play and is written out on Stop (or natural completion), to
+	logs/log_{date_time}_{sud_name}.log. A Pause/resume doesn't start a new
+	file - only a fresh Play (from IDLE/DONE) does."""
+
+	def __init__(self, tc: APid, heater: AHeater, heater_task, sud, interval, path='./logs', config=None, dt=None):
+		ServerLogTask.__init__(self, tc, heater, heater_task, interval, path, config, dt)
+		self.sud = sud
+		self._active = False
+
+	def _should_sample(self):
+		return self._active
+
+	def _filename(self):
+		name_part = _safe_filename_part(self.sud.name or 'Sud')
+		return 'log_{}_{}.log'.format(self._run_id, name_part)
+
+	def start_run(self):
+		if self._active:
+			return
+		self._samples = []
+		self._t0 = time.monotonic()
+		self._run_id = time.strftime("%Y%m%dT%H%M%S", time.localtime())
+		self._active = True
+
+	def stop_run(self):
+		if not self._active:
+			return
+		self._active = False
+		self.write()
+		self._param_events = []