X-Git-Url: https://plomlompom.com/repos/?a=blobdiff_plain;f=plomrogue-server.py;h=df0c211bdd2458ffad559f636404abd4f90285ae;hb=76180c99a9cf02004faaf1fb70e79a41228c7746;hp=9bdab821360dd4262d1de20a9f817e197eb6c8dd;hpb=211117b78cd617e6117df99de895a0eb81751eb8;p=plomrogue diff --git a/plomrogue-server.py b/plomrogue-server.py index 9bdab82..df0c211 100755 --- a/plomrogue-server.py +++ b/plomrogue-server.py @@ -2,31 +2,40 @@ import argparse import errno import os import shlex +import shutil import time 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"]. + 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["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): @@ -40,9 +49,9 @@ def cleanup_server_io(io_db): 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." @@ -50,36 +59,118 @@ def detect_atomic_leftover(path): raise SystemExit(msg) -def obey(msg): +def obey(cmd, io_db, prefix): """""" - print("Input: " + msg) - print(shlex.split(msg)) + 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") + elif "QUIT" == tokens[0] and 1 == len(tokens): + record("# " + cmd, path_recordfile) + raise SystemExit("received QUIT command") + elif "MAKE_WORLD" == tokens[0] and 2 == len(tokens): + print("I would generate a new world now, if only I knew how.") + 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, break_test=None): + """Call obey() on each line of path's file, use name in input prefix. + + If break_test function is set, only read the file until it returns True. + """ + file = open(path, "r") + line_n = 1 + for line in file.readlines(): + if None != break_test and break_test(): + break + obey(line.rstrip(), io_db, name + "file line " + str(line_n)) + line_n = line_n + 1 + file.close() + + +def make_turn_tester(turn_to_compare, world_db): + """Return tester whether world_db["turn"] greater/equal turn_to_compare.""" + def turn_tester(): + return world_db["turn"] >= turn_to_compare + return turn_tester + + +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() + return opts + + +def server_test(io_db): + """Check for valid server out file belonging to current process.""" + 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() + print(str(test) + " == " + io_db["teststring"] + " ?") + if test != io_db["teststring"]: + 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) + +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).") - if not os.access(path_recordfile, os.F_OK): + if not os.access(io_db["path_record"], os.F_OK): raise SystemExit("No record file found to replay.") - elif os.access(path_savefile, os.F_OK): - print(open(path_savefile, "r").read()) + world_db["turn"] = 0 + break_tester = make_turn_tester(opts.replay, world_db) + obey_lines_in_file(io_db["path_record"], "record ", break_tester) + # what to do next? else: - msg = "MAKE_WORLD " + str(int(time.time())) - obey(msg) + 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 ") + obey("MAKE_WORLD " + str(int(time.time())), io_db, "in file") + # print("DUMMY: Run io_loop().") except SystemExit as exit: print("ABORTING: " + exit.args[0]) except: