X-Git-Url: https://plomlompom.com/repos/?a=blobdiff_plain;f=plomrogue-server.py;h=6f51078710609f13bcc7b5067ae391d7fbf0e3d9;hb=876840711e8e51be461b2b921eac52cdd2faefcb;hp=c7d5ddead9351e40025904fdf87014c14cc51105;hpb=c3a2d6655c841a901dc4a84c5fab165dce0a2891;p=plomrogue diff --git a/plomrogue-server.py b/plomrogue-server.py index c7d5dde..6f51078 100755 --- a/plomrogue-server.py +++ b/plomrogue-server.py @@ -6,28 +6,24 @@ import shutil import time -def setup_server_io(io_db): +def setup_server_io(): """Fill IO files DB with proper file( path)s. Write process IO test string. - Set io_db["kicked_by_rival"] to False. Decide file paths. Ensure IO files - directory at server/. Remove any old in file if found. Set up new in file - (io_db["file_in"]) for reading at io_db["path_in"], and new out file - (io_db["file_out"]) for writing at io_db["path_out"]. Start out file with - process hash line of format PID + " " + floated UNIX time - (io_db["teststring"]). Run detect_atomic_leftover on io_db["path_record"] - and io_db["path_save"]. + Ensure IO files directory at server/. Remove any old input file if found. + Set up new input file for reading, and new output file for writing. Start + output file with process hash line of format PID + " " + floated UNIX time + (io_db["teststring"]). Raise SystemExit if file is found at path of either + record or save file plus io_db["tmp_suffix"]. """ - io_dir = "server/" - io_db["kicked_by_rival"] = False - io_db["path_in"] = io_dir + "in" - io_db["path_out"] = io_dir + "out" - io_db["path_worldstate"] = io_dir + "worldstate" - io_db["path_record"] = "record" - io_db["path_save"] = "save" - io_db["path_worldconf"] = "confserver/world" - io_db["tmp_suffix"] = "_tmp" + def detect_atomic_leftover(path, tmp_suffix): + path_tmp = path + tmp_suffix + msg = "Found file '" + path_tmp + "' that may be a leftover from an " \ + "aborted previous attempt to write '" + path + "'. Aborting " \ + "until matter is resolved by removing it from its current path." + if os.access(path_tmp, os.F_OK): + raise SystemExit(msg) io_db["teststring"] = str(os.getpid()) + " " + str(time.time()) - os.makedirs(io_dir, exist_ok=True) + os.makedirs(io_db["path_server"], exist_ok=True) io_db["file_out"] = open(io_db["path_out"], "w") io_db["file_out"].write(io_db["teststring"] + "\n") io_db["file_out"].flush() @@ -40,7 +36,7 @@ def setup_server_io(io_db): detect_atomic_leftover(io_db["path_record"], io_db["tmp_suffix"]) -def cleanup_server_io(io_db): +def cleanup_server_io(): """Close and (if io_db["kicked_by_rival"] false) remove files in io_db.""" def helper(file_key, path_key): if file_key in io_db: @@ -51,70 +47,79 @@ def cleanup_server_io(io_db): helper("file_out", "path_out") helper("file_in", "path_in") helper("file_worldstate", "path_worldstate") + if "file_record" in io_db: + io_db["file_record"].close() -def detect_atomic_leftover(path, tmp_suffix): - """Raise explained SystemExit if file is found at path + tmp_suffix.""" - path_tmp = path + tmp_suffix - msg = "Found file '" + path_tmp + "' that may be a leftover from an " \ - "aborted previous attempt to write '" + path + "'. Aborting until " \ - "the matter is resolved by removing it from its current path." - if os.access(path_tmp, os.F_OK): - raise SystemExit(msg) - +def obey(command, prefix, replay=False, do_record=False): + """Call function from commands_db mapped to command's first token. -def obey(cmd, io_db, prefix, replay_file=None, do_record=False): - """""" - server_test(io_db) - print("input " + prefix + ": " + cmd) + The command string is tokenized by shlex.split(comments=True). If replay is + set, a non-meta command from the commands_db merely triggers obey() on the + next command from the records file. If not, and do do_record is set, + non-meta commands are recorded via record(), and save_world() is called. + The prefix string is inserted into the server's input message between its + beginning 'input ' & ':'. All activity is preceded by a server_test() call. + """ + server_test() + print("input " + prefix + ": " + command) try: - tokens = shlex.split(cmd, comments=True) + tokens = shlex.split(command, comments=True) except ValueError as err: print("Can't tokenize command string: " + str(err) + ".") return - if 0 == len(tokens): - pass - elif "PING" == tokens[0] and 1 == len(tokens): - io_db["file_out"].write("PONG\n") - io_db["file_out"].flush() - elif "QUIT" == tokens[0] and 1 == len(tokens): - if do_record: - record("# " + cmd, io_db) - raise SystemExit("received QUIT command") - elif "MAKE_WORLD" == tokens[0] and 2 == len(tokens): - if replay_file: + if len(tokens) > 0 and tokens[0] in commands_db \ + and len(tokens) >= commands_db[tokens[0]][0] + 1: + if commands_db[tokens[0]][1]: + commands_db[tokens[0]][2]() + elif replay: print("Due to replay mode, reading command as 'go on in record'.") - line = replay_file.readline() + line = io_db["file_record"].readline() if len(line) > 0: - obey(line.rstrip(), io_db, - replay_file.prefix + str(file.line_n)) - file.line_n = file.line_n + 1 + obey(line.rstrip(), io_db["file_record"].prefix + + str(io_db["file_record"].line_n)) + io_db["file_record"].line_n = io_db["file_record"].line_n + 1 else: print("Reached end of record file.") else: - print("I would generate a new world now, if only I knew how.") + commands_db[tokens[0]][2]() if do_record: - record(cmd, io_db) + record(command) + save_world() else: print("Invalid command/argument, or bad number of tokens.") -def record(cmd, io_db): - """Append cmd string plus newline to file at path_recordfile. (Atomic.)""" - # This misses some optimizations from the original record(), namely only - # finishing the atomic write with expensive flush() and fsync() every 15 - # seconds unless explicitely forced. Implement as needed. - path_tmp = io_db["path_record"] + io_db["tmp_suffix"] - if os.access(io_db["path_record"], os.F_OK): - shutil.copyfile(io_db["path_record"], path_tmp) - file = open(path_tmp, "a") - file.write(cmd + "\n") +def atomic_write(path, text, do_append=False): + """Atomic write of text to file at path, appended if do_append is set.""" + path_tmp = path + io_db["tmp_suffix"] + mode = "w" + if do_append: + mode = "a" + if os.access(path, os.F_OK): + shutil.copyfile(path, path_tmp) + file = open(path_tmp, mode) + file.write(text) file.flush() os.fsync(file.fileno()) file.close() - if os.access(io_db["path_record"], os.F_OK): - os.remove(io_db["path_record"]) - os.rename(path_tmp, io_db["path_record"]) + if os.access(path, os.F_OK): + os.remove(path) + os.rename(path_tmp, path) + + +def record(command): + """Append command string plus newline to record file. (Atomic.)""" + # This misses some optimizations from the original record(), namely only + # finishing the atomic write with expensive flush() and fsync() every 15 + # seconds unless explicitely forced. Implement as needed. + atomic_write(io_db["path_record"], command + "\n", do_append=True) + + +def save_world(): + # Dummy for saving all commands to reconstruct current world state. + # Misses same optimizations as record() from the original record(). + atomic_write(io_db["path_save"], "bla\n") def obey_lines_in_file(path, name, do_record=False): @@ -122,7 +127,7 @@ def obey_lines_in_file(path, name, do_record=False): file = open(path, "r") line_n = 1 for line in file.readlines(): - obey(line.rstrip(), io_db, name + "file line " + str(line_n), + obey(line.rstrip(), name + "file line " + str(line_n), do_record=do_record) line_n = line_n + 1 file.close() @@ -137,10 +142,12 @@ def parse_command_line_arguments(): return opts -def server_test(io_db): +def server_test(): """Ensure valid server out file belonging to current process. - On failure, set io_db["kicked_by_rival"] and raise SystemExit. + This is done by comparing io_db["teststring"] to what's found at the start + of the current file at io_db["path_out"]. On failure, set + io_db["kicked_by_rival"] and raise SystemExit. """ if not os.access(io_db["path_out"], os.F_OK): raise SystemExit("Server output file has disappeared.") @@ -155,7 +162,7 @@ def server_test(io_db): raise SystemExit(msg) -def read_command(io_db): +def read_command(): """Return next newline-delimited command from server in file. Keep building return string until a newline is encountered. Pause between @@ -165,7 +172,7 @@ def read_command(io_db): max_wait = 5 now = time.time() command = "" - while 1: + while True: add = io_db["file_in"].readline() if len(add) > 0: command = command + add @@ -175,56 +182,121 @@ def read_command(io_db): else: time.sleep(wait_on_fail) if now + max_wait < time.time(): - server_test(io_db) + server_test() now = time.time() return command -io_db = {} -world_db = {} +def replay_game(): + """Replay game from record file. + + Use opts.replay as breakpoint turn to which to replay automatically before + switching to manual input by non-meta commands in server input file + triggering further reads of record file. Ensure opts.replay is at least 1. + """ + if opts.replay < 1: + opts.replay = 1 + print("Replay mode. Auto-replaying up to turn " + str(opts.replay) + + " (if so late a turn is to be found).") + if not os.access(io_db["path_record"], os.F_OK): + raise SystemExit("No record file found to replay.") + io_db["file_record"] = open(io_db["path_record"], "r") + io_db["file_record"].prefix = "record file line " + io_db["file_record"].line_n = 1 + while world_db["turn"] < opts.replay: + line = io_db["file_record"].readline() + if "" == line: + break + obey(line.rstrip(), io_db["file_record"].prefix + + str(io_db["file_record"].line_n)) + io_db["file_record"].line_n = io_db["file_record"].line_n + 1 + while True: + obey(read_command(), "in file", replay=True) + + +def play_game(): + """Play game by server input file commands. Before, load save file found. + + If no save file is found, a new world is generated from the commands in the + world config plus a 'MAKE WORLD [current Unix timestamp]'. Record this + command and all that follow via the server input file. + """ + if os.access(io_db["path_save"], os.F_OK): + obey_lines_in_file(io_db["path_save"], "save") + else: + if not os.access(io_db["path_worldconf"], os.F_OK): + msg = "No world config file from which to start a new world." + raise SystemExit(msg) + obey_lines_in_file(io_db["path_worldconf"], "world config ", + do_record=True) + obey("MAKE_WORLD " + str(int(time.time())), "in file", do_record=True) + while True: + obey(read_command(), "in file", do_record=True) + + +def command_makeworld(): + """Mere dummy so far.""" + print("I would build a whole world now if only I knew how.") + + +def command_ping(): + """Send PONG line to server output file.""" + io_db["file_out"].write("PONG\n") + io_db["file_out"].flush() + + +def command_quit(): + """Abort server process.""" + raise SystemExit("received QUIT command") + + +"""Commands database. + +Map command start tokens to ([0]) minimum number of expected command arguments, +([1]) the command's meta-ness (i.e. is it to be written to the record file, is +it to be ignored in replay mode if read from server input file), and ([2]) a +function to be called on it. +""" +commands_db = { + "QUIT": (0, True, command_quit), + "PING": (0, True, command_ping), + "MAKE_WORLD": (1, False, command_makeworld) +} + + +"""World state database,""" +world_db = { + "turn": 0 +} + + +"""File IO database.""" +io_db = { + "path_save": "save", + "path_record": "record", + "path_worldconf": "confserver/world", + "path_server": "server/", + "path_in": "server/in", + "path_out": "server/out", + "path_worldstate": "server/worldstate", + "tmp_suffix": "_tmp", + "kicked_by_rival": False +} + + try: opts = parse_command_line_arguments() - setup_server_io(io_db) + setup_server_io() # print("DUMMY: Run game.") if None != opts.replay: - if opts.replay < 1: - opts.replay = 1 - print("Replay mode. Auto-replaying up to turn " + str(opts.replay) + - " (if so late a turn is to be found).") - if not os.access(io_db["path_record"], os.F_OK): - raise SystemExit("No record file found to replay.") - world_db["turn"] = 0 - file = open(io_db["path_record"], "r") - file.prefix = "recod file line " - file.line_n = 1 - while world_db["turn"] < opts.replay: - obey(file.readline().rstrip(), io_db, - file.prefix + str(file.line_n)) - file.line_n = file.line_n + 1 - try: - while 1: - obey(read_command(io_db), io_db, "in file", replay_file=file) - except SystemExit: - file.close() - raise + replay_game() else: - if os.access(io_db["path_save"], os.F_OK): - obey_lines_in_file(io_db["path_save"], "save") - else: - if not os.access(io_db["path_worldconf"], os.F_OK): - msg = "No world config file from which to start a new world." - raise SystemExit(msg) - obey_lines_in_file(io_db["path_worldconf"], "world config ", - do_record=True) - obey("MAKE_WORLD " + str(int(time.time())), io_db, "in file", - do_record=True) - while 1: - obey(read_command(io_db), io_db, "in file", do_record=True) + play_game() except SystemExit as exit: print("ABORTING: " + exit.args[0]) except: print("SOMETHING WENT WRONG IN UNEXPECTED WAYS") raise finally: - cleanup_server_io(io_db) + cleanup_server_io() # print("DUMMY: (Clean up C heap.)")