X-Git-Url: https://plomlompom.com/repos/?a=blobdiff_plain;f=plomrogue-server.py;h=c7d5ddead9351e40025904fdf87014c14cc51105;hb=c3a2d6655c841a901dc4a84c5fab165dce0a2891;hp=20704308545fead9275f4092ad794fb74b5d17ea;hpb=88f9b0f3a072b8d796f06a620f3a1170a96e3358;p=plomrogue diff --git a/plomrogue-server.py b/plomrogue-server.py index 2070430..c7d5dde 100755 --- a/plomrogue-server.py +++ b/plomrogue-server.py @@ -1,93 +1,227 @@ import argparse import errno import os +import shlex +import shutil import time -class HandledException(Exception): - """Feature-less Exception child. Use for expected operational errors.""" - - pass - - def setup_server_io(io_db): """Fill IO files DB with proper file( path)s. Write process IO test string. - 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"]). Set worldstate file path io_db["path_worldstate"]. + 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"]. """ 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" io_db["teststring"] = str(os.getpid()) + " " + str(time.time()) os.makedirs(io_dir, 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() if os.access(io_db["path_in"], os.F_OK): os.remove(io_db["path_in"]) io_db["file_in"] = open(io_db["path_in"], "w") io_db["file_in"].close() io_db["file_in"] = open(io_db["path_in"], "r") + detect_atomic_leftover(io_db["path_save"], io_db["tmp_suffix"]) + detect_atomic_leftover(io_db["path_record"], io_db["tmp_suffix"]) def cleanup_server_io(io_db): - """Close and remove all files open in IO files DB.""" + """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: io_db[file_key].close() - os.remove(io_db[path_key]) + if not io_db["kicked_by_rival"] \ + and os.access(io_db[path_key], os.F_OK): + os.remove(io_db[path_key]) helper("file_out", "path_out") helper("file_in", "path_in") helper("file_worldstate", "path_worldstate") -def detect_atomic_leftover(path): - """Raise explained HandledException if file is found at path + "_tmp".""" - path_tmp = path + "_tmp" +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 HandledException(msg) + raise SystemExit(msg) -def obey(msg): +def obey(cmd, io_db, prefix, replay_file=None, do_record=False): """""" - print("Input: " + msg) + server_test(io_db) + print("input " + prefix + ": " + cmd) + try: + tokens = shlex.split(cmd, 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: + print("Due to replay mode, reading command as 'go on in record'.") + line = replay_file.readline() + if len(line) > 0: + obey(line.rstrip(), io_db, + replay_file.prefix + str(file.line_n)) + file.line_n = file.line_n + 1 + else: + print("Reached end of record file.") + else: + print("I would generate a new world now, if only I knew how.") + if do_record: + record(cmd, io_db) + else: + print("Invalid command/argument, or bad number of tokens.") -io_db = {} -try: +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") + 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"]) + + +def obey_lines_in_file(path, name, do_record=False): + """Call obey() on each line of path's file, use name in input prefix.""" + file = open(path, "r") + line_n = 1 + for line in file.readlines(): + obey(line.rstrip(), io_db, name + "file line " + str(line_n), + do_record=do_record) + line_n = line_n + 1 + file.close() + + +def parse_command_line_arguments(): + """Return settings values read from command line arguments.""" parser = argparse.ArgumentParser() parser.add_argument('-s', nargs='?', type=int, dest='replay', const=1, action='store') opts, unknown = parser.parse_known_args() - print(opts) + return opts + + +def server_test(io_db): + """Ensure valid server out file belonging to current process. + + 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.") + file = open(io_db["path_out"], "r") + test = file.readline().rstrip("\n") + file.close() + if test != io_db["teststring"]: + io_db["kicked_by_rival"] = True + msg = "Server test string in server output file does not match. This" \ + " indicates that the current server process has been " \ + "superseded by another one." + raise SystemExit(msg) + + +def read_command(io_db): + """Return next newline-delimited command from server in file. + + Keep building return string until a newline is encountered. Pause between + unsuccessful reads, and after too much waiting, run server_test(). + """ + wait_on_fail = 1 + max_wait = 5 + now = time.time() + command = "" + while 1: + add = io_db["file_in"].readline() + if len(add) > 0: + command = command + add + if len(command) > 0 and "\n" == command[-1]: + command = command[:-1] + break + else: + time.sleep(wait_on_fail) + if now + max_wait < time.time(): + server_test(io_db) + now = time.time() + return command + + +io_db = {} +world_db = {} +try: + opts = parse_command_line_arguments() setup_server_io(io_db) # print("DUMMY: Run game.") - path_recordfile = "recordfile" - path_savefile = "savefile" - detect_atomic_leftover(path_savefile) - detect_atomic_leftover(path_recordfile) 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).") - elif os.access(path_savefile, os.F_OK): - print(open(path_savefile, "r").read()) + " (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 else: - msg = "MAKE_WORLD " + str(int(time.time())) - obey(msg) -except SystemExit: - pass -except HandledException as exception: - print("Error:") - print(exception.args[0]) + 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) +except SystemExit as exit: + print("ABORTING: " + exit.args[0]) except: print("SOMETHING WENT WRONG IN UNEXPECTED WAYS") raise