Start work on server-side saving worlds

This commit includes a a few more changes because I'm too lazy to
clean them up:
 - fix chunk modification times
 - improve command line arguments
 - load multiple chunks at once

chunks.py

@@ -112,8 +112,7 @@ class Chunk():
 		self._content = ChunkDiff()
 		self._modifications = ChunkDiff()
 		
-		self.last_modified = None
-		self.touch()
+		self.last_modified = 0
 	
 	def set(self, x, y, character):
 		self._modifications.set(x, y, character)
@@ -151,7 +150,7 @@ class Chunk():
 		self.last_modified = now or time.time()
 	
 	def age(self, now=None):
-		return self.last_modified - (now or time.time())
+		return (now or time.time()) - self.last_modified
 	
 	def lines(self):
 		return self.as_diff().lines()
@@ -195,7 +194,8 @@ class ChunkPool():
 		for dchunk in diffs:
 			pos = dchunk[0]
 			diff = dchunk[1]
-			chunk = self.load(pos)
+			chunk = self.get(pos) or self.create(pos)
+			#chunk = self.load(pos)
 			
 			if not diff.empty():
 				chunk.apply_diff(diff)
@@ -204,7 +204,8 @@ class ChunkPool():
 		for dchunk in diffs:
 			pos = dchunk[0]
 			diff = dchunk[1]
-			chunk = self.load(pos)
+			chunk = self.get(pos) or self.create(pos)
+			#chunk = self.load(pos)
 			
 			if not diff.empty():
 				chunk.commit_diff(diff)
@@ -213,8 +214,9 @@ class ChunkPool():
 		changes = []
 		
 		for pos, chunk in self._chunks.items():
-			changes.append((pos, chunk.get_changes()))
-			chunk.commit_changes()
+			if chunk.modified():
+				changes.append((pos, chunk.get_changes()))
+				chunk.commit_changes()
 		
 		return changes
 	
@@ -222,7 +224,9 @@ class ChunkPool():
 		self.commit_changes()
 	
 	def load(self, pos):
-		return self.get(pos) or self.create(pos)
+		if not self.get(pos):
+			self.create(pos)
+		#return self.get(pos) or self.create(pos)
 	
 	def load_list(self, coords):
 		for pos in coords:

client.py

@@ -14,14 +14,14 @@ from utils import Position
 from clientchunkpool import ClientChunkPool
 
 class Client():
-	def __init__(self, address, logfile=None):
+	def __init__(self, address, port=None, logfile=None):
 		self.stopping = False
 		
 		self.map_ = None
 		self.chunkmap = None
 		self.chunkmap_active = False
 		
-		self.address = f"ws://{address}/"
+		self.address = f"ws://{address}:{port}/"
 		self._drawevent = threading.Event()
 		self.pool = ClientChunkPool(self)
 		
@@ -171,17 +171,32 @@ class Client():
 		self._ws.send(json.dumps(message))
 
 def main(argv):
-	if len(argv) == 2:
-		client = Client(argv[1])
-	elif len(argv) == 3:
-		client = Client(argv[1], argv[2])
-	else:
+	if len(argv) == 1 or len(argv) > 4:
 		print("Usage:")
-		print(f"  {argv[0]} address [logfile]")
+		print(f"  {argv[0]} address [port [logfile]]")
+		print("  default port: 8000")
 		return
 	
+	address = argv[1]
+	
+	if len(argv) >= 3:
+		try:
+			port = int(argv[2])
+		except ValueError:
+			print("Invalid port")
+			return
+	else:
+		port = 8000
+	
+	# only for debugging, will be removed later
+	if len(argv) >= 4:
+		logfile = argv[3]
+	else:
+		logfile = None
+	
 	os.environ.setdefault('ESCDELAY', '25') # only a 25 millisecond delay
 	
+	client = Client(address, port, logfile)
 	curses.wrapper(client.launch)
 
 if __name__ == "__main__":

clientchunkpool.py

@@ -36,6 +36,9 @@ class ClientChunkPool(ChunkPool):
 		if diffs:
 			self._client.send_changes(diffs)
 	
+	def load(self, pos):
+		raise Exception
+	
 	def load_list(self, coords):
 		coords = [pos for pos in coords if pos not in self._chunks]
 		if coords:
@@ -43,6 +46,6 @@ class ClientChunkPool(ChunkPool):
 	
 	def unload_list(self, coords):
 		if coords:
-			#self.save_changes()
 			self._client.unload_chunks(coords)
-			super().unload_list(coords)
+		
+		super().unload_list(coords)

dbchunkpool.py

@@ -1,17 +1,127 @@
+import sqlite3
+import time
+import threading
+
 from chunks import ChunkPool
+from utils import Position
 
 class ChunkDB():
 	"""
 	Load and save chunks to a SQLite db.
 	"""
 	
-	pass
+	def __init__(self, filename):
+		self.dbfilename = filename
+	
+	def transaction(func):
+		def wrapper(self, *args, **kwargs):
+			con = sqlite3.connect(self.dbfilename)
+			try:
+				with con:
+					return func(self, con, *args, **kwargs)
+			finally:
+				con.close()
+		
+		return wrapper
+	
+	@transaction
+	def save_many(self, con, chunks):
+		print("save_many")
+	
+	@transaction
+	def load_many(self, con, coords):
+		print("load_many")
+		return [(coor, None) for coor in coords]
 
 class DBChunkPool(ChunkPool):
 	"""
 	A ChunkPool that can load/save chunks from/to a database.
 	"""
 	
-	#def __init__(self, filename):
-		#super().init()
-		#self._chunkdb = ChunkDB(filename)
+	def __init__(self, filename):
+		super().__init__()
+		self._chunkdb = ChunkDB(filename)
+		
+		self.save_period = 10 # save and clean up every minute
+		self.max_age = 20 # ca. one minute until a chunk is unloaded again
+		
+		self.save_thread = threading.Thread(
+			target=self.perodic_save,
+			name="save_thread",
+			daemon=True
+		)
+		self.save_thread.start()
+	
+	def save_changes(self):
+		diffs = self.commit_changes()
+		
+		changed_chunks = []
+		for dchunk in diffs:
+			pos = dchunk[0]
+			chunk = self.get(pos)
+			changed_chunks.append((pos, chunk))
+		
+		self._chunkdb.save_many(changed_chunks)
+	
+	def load(self, pos):
+		print("Loading individual chunk...")
+		raise Exception
+	
+	def load_list(self, coords):
+		print("Loading chunk list...")
+		to_load = [pos for pos in coords if pos not in self._chunks]
+		chunks = self._chunkdb.load_many(to_load)
+		for dchunk in chunks:
+			pos = dchunk[0]
+			chunk = dchunk[1]
+			if chunk:
+				self.set(pos, chunk)
+			else:
+				self.create(pos)
+	
+	def perodic_save(self):
+		while True:
+			time.sleep(self.save_period)
+			
+			with self:
+				print("BEFORE:::")
+				self.print_chunks()
+				
+				self.save_changes()
+				
+				# unload old chunks
+				now = time.time()
+				for pos, chunk in self._chunks.items():
+					print(f"p{pos} :: t{now} :: m{chunk.last_modified} :: a{chunk.age(now)}")
+				self.clean_up(condition=lambda pos, chunk: chunk.age(now) > self.max_age)
+				
+				print("AFTER:::")
+				self.print_chunks()
+	
+	def get_min_max(self):
+		minx = min(pos.x for pos in self._chunks)
+		maxx = max(pos.x for pos in self._chunks)
+		miny = min(pos.y for pos in self._chunks)
+		maxy = max(pos.y for pos in self._chunks)
+		
+		return minx, maxx, miny, maxy
+	
+	def print_chunks(self):
+		if self._chunks:
+			minx, maxx, miny, maxy = self.get_min_max()
+			sizex, sizey = maxx - minx + 1, maxy - miny + 1
+			print("┌" + "─"*sizex*2 + "┐")
+			for y in range(miny, maxy + 1):
+				line = []
+				for x in range(minx, maxx + 1):
+					chunk = self._chunks.get(Position(x, y))
+					if chunk:
+						if chunk.empty():
+							line.append("()")
+						else:
+							line.append("[]")
+					else:
+						line.append("  ")
+				line = "".join(line)
+				print("│" + line + "│")
+			print("└" + "─"*sizex*2 + "┘")

maps.py

@@ -144,6 +144,7 @@ class Map():
 	def delete(self):
 		with self.chunkpool as pool:
 			chunk = pool.get(Position(chunkx(self.cursorx-1), chunky(self.cursory)))
+			
 			if chunk:
 				chunk.delete(inchunkx(self.cursorx-1), inchunky(self.cursory))
 				pool.save_changes_delayed()

server.py

@@ -8,16 +8,17 @@ from utils import Position
 from chunks import ChunkDiff, jsonify_diffs, dejsonify_diffs
 from dbchunkpool import DBChunkPool
 
-pool = DBChunkPool()
-clients = []
+from chunks import ChunkPool
 
 class WotServer(WebSocket):
 	def handle_request_chunks(self, coords):
 		diffs = []
-		with pool:
-			for coor in coords:
-				pos = Position(coor[0], coor[1])
-				chunk = pool.load(pos)
+		with self.pool as pool:
+			coords = [Position(coor[0], coor[1]) for coor in coords]
+			pool.load_list(coords)
+			
+			for pos in coords:
+				chunk = pool.get(pos)
 				diffs.append((pos, chunk.as_diff()))
 				
 				self.loaded_chunks.add(pos)
@@ -46,10 +47,10 @@ class WotServer(WebSocket):
 				illegitimate_diffs.append(dchunk)
 		
 		if legitimate_diffs:
-			with pool:
+			with self.pool as pool:
 				pool.apply_diffs(legitimate_diffs)
 			
-			for client in clients:
+			for client in self.clients:
 				if client:
 					client.send_changes(legitimate_diffs)
 		
@@ -60,12 +61,16 @@ class WotServer(WebSocket):
 			self.sendMessage(json.dumps(message))
 	
 	def reverse_diffs(self, diffs):
-		with pool:
+		coords = [dchunk[0] for dchunk in diffs]
+		
+		with self.pool as pool:
+			pool.load_list(coords)
+			
 			reverse_diffs = []
 			for dchunk in diffs:
 				pos = dchunk[0]
 				diff = dchunk[1]
-				chunk = pool.load(pos)
+				chunk = pool.get(pos)
 				reverse_diff = diff.diff(chunk.as_diff())
 				reverse_diffs.append((pos, reverse_diff))
 		
@@ -92,45 +97,55 @@ class WotServer(WebSocket):
 		self.loaded_chunks = set()
 		
 		try:
-			i = clients.index(None)
-			clients[i] = self
+			i = self.clients.index(None)
+			self.clients[i] = self
 		except ValueError:
-			clients.append(self)
-			i = len(clients) - 1
+			self.clients.append(self)
+			i = len(self.clients) - 1
 		
-		graphstr = "".join(["┯" if j == i else ("│" if v else " ") for j, v in enumerate(clients)])
-		print(f"{graphstr}   {self.address[0]}")
+		graphstr = "".join(["┯" if j == i else ("│" if v else " ") for j, v in enumerate(self.clients)])
+		print(f"{graphstr}  {self.address[0]}")
 	
 	def handleClose(self):
-		i = clients.index(self)
+		i = self.clients.index(self)
 		
-		graphstr = "".join(["┷" if j == i else ("│" if v else " ") for j, v in enumerate(clients)])
+		graphstr = "".join(["┷" if j == i else ("│" if v else " ") for j, v in enumerate(self.clients)])
 		print(graphstr)
 		#print(f"{graphstr}   {self.address[0]}")
 		
-		clients[i] = None
-		while clients and not clients[-1]:
-			clients.pop()
+		self.clients[i] = None
+		while self.clients and not self.clients[-1]:
+			self.clients.pop()
 
 def main(argv):
-	if len(argv) > 2:
+	if len(argv) == 1 or len(argv) > 3:
 		print("Usage:")
-		print(f"  {argv[0]} [port]")
+		print(f"  {argv[0]} dbfile [port]")
 		print("  default port: 8000")
 		return
-	elif len(argv) > 1:
+	
+	dbfile = argv[1]
+	
+	if len(argv) >= 3:
 		try:
-			port = int(argv[1])
+			port = int(argv[2])
 		except ValueError:
 			print("Invalid port")
 			return
 	else:
 		port = 8000
 	
+	print("Connecting to db")
+	WotServer.pool = DBChunkPool(dbfile)
+	WotServer.clients = []
+	
 	server = SimpleWebSocketServer('', port, WotServer)
 	try:
 		server.serveforever()
 	except KeyboardInterrupt:
+		print("")
+		print("Saving recent changes.")
+		WotServer.pool.save_changes()
 		print("Stopped.")
 
 if __name__ == "__main__":