From 595eda374097a2191b2477190ea2e0f9cd6f93da Mon Sep 17 00:00:00 2001 From: Christian Heller Date: Mon, 23 Feb 2015 12:06:55 +0100 Subject: [PATCH] Server/py: Proper obey() / commands DB infrastructure. More globalizing. --- plomrogue-server.py | 99 +++++++++++++++++++++++++++++---------------- 1 file changed, 65 insertions(+), 34 deletions(-) diff --git a/plomrogue-server.py b/plomrogue-server.py index 68404d6..064f872 100755 --- a/plomrogue-server.py +++ b/plomrogue-server.py @@ -6,7 +6,7 @@ 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 @@ -40,7 +40,7 @@ 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: @@ -65,44 +65,46 @@ def detect_atomic_leftover(path, tmp_suffix): raise SystemExit(msg) -def obey(cmd, io_db, prefix, replay=False, do_record=False): - """""" - server_test(io_db) - print("input " + prefix + ": " + cmd) +def obey(command, prefix, replay=False, do_record=False): + """Call function from commands_db mapped to command's first token. + + 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. Non-meta commands are recorded in + non-replay mode if do_record is set. The prefix string is inserted into the + server's input message between its beginning 'input ' and ':'. All activity + is preceded by a call to server_test(). + """ + 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: + if len(tokens) > 0 and tokens[0] in commands \ + and len(tokens) >= commands[tokens[0]][0] + 1: + if commands[tokens[0]][1]: + commands[tokens[0]][2]() + elif replay: print("Due to replay mode, reading command as 'go on in record'.") line = io_db["file_record"].readline() if len(line) > 0: - obey(line.rstrip(), io_db, io_db["file_record"].prefix + 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[tokens[0]][2]() if do_record: - record(cmd, io_db) + record(command) 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.)""" +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. @@ -110,7 +112,7 @@ def record(cmd, io_db): 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.write(command + "\n") file.flush() os.fsync(file.fileno()) file.close() @@ -124,7 +126,7 @@ 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() @@ -139,7 +141,7 @@ 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. @@ -157,7 +159,7 @@ 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 @@ -177,16 +179,45 @@ 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 +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) +} + io_db = {} world_db = {} 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: @@ -203,11 +234,11 @@ try: line = io_db["file_record"].readline() if "" == line: break - obey(line.rstrip(), io_db, io_db["file_record"].prefix + 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(io_db), io_db, "in file", replay=True) + obey(read_command(), "in file", replay=True) else: if os.access(io_db["path_save"], os.F_OK): obey_lines_in_file(io_db["path_save"], "save") @@ -217,15 +248,15 @@ try: 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", + obey("MAKE_WORLD " + str(int(time.time())), "in file", do_record=True) while True: - obey(read_command(io_db), io_db, "in file", do_record=True) + obey(read_command(), "in file", do_record=True) 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.)") -- 2.30.2