9 def setup_server_io(io_db):
10 """Fill IO files DB with proper file( path)s. Write process IO test string.
12 Set io_db["kicked_by_rival"] to False. Decide file paths. Ensure IO files
13 directory at server/. Remove any old in file if found. Set up new in file
14 (io_db["file_in"]) for reading at io_db["path_in"], and new out file
15 (io_db["file_out"]) for writing at io_db["path_out"]. Start out file with
16 process hash line of format PID + " " + floated UNIX time
17 (io_db["teststring"]). Run detect_atomic_leftover on io_db["path_record"]
18 and io_db["path_save"].
21 io_db["kicked_by_rival"] = False
22 io_db["path_in"] = io_dir + "in"
23 io_db["path_out"] = io_dir + "out"
24 io_db["path_worldstate"] = io_dir + "worldstate"
25 io_db["path_record"] = "record"
26 io_db["path_save"] = "save"
27 io_db["path_worldconf"] = "confserver/world"
28 io_db["tmp_suffix"] = "_tmp"
29 io_db["teststring"] = str(os.getpid()) + " " + str(time.time())
30 os.makedirs(io_dir, exist_ok=True)
31 io_db["file_out"] = open(io_db["path_out"], "w")
32 io_db["file_out"].write(io_db["teststring"] + "\n")
33 io_db["file_out"].flush()
34 if os.access(io_db["path_in"], os.F_OK):
35 os.remove(io_db["path_in"])
36 io_db["file_in"] = open(io_db["path_in"], "w")
37 io_db["file_in"].close()
38 io_db["file_in"] = open(io_db["path_in"], "r")
39 detect_atomic_leftover(io_db["path_save"], io_db["tmp_suffix"])
40 detect_atomic_leftover(io_db["path_record"], io_db["tmp_suffix"])
43 def cleanup_server_io(io_db):
44 """Close and (if io_db["kicked_by_rival"] false) remove files in io_db."""
45 def helper(file_key, path_key):
47 io_db[file_key].close()
48 if not io_db["kicked_by_rival"] \
49 and os.access(io_db[path_key], os.F_OK):
50 os.remove(io_db[path_key])
51 helper("file_out", "path_out")
52 helper("file_in", "path_in")
53 helper("file_worldstate", "path_worldstate")
56 def detect_atomic_leftover(path, tmp_suffix):
57 """Raise explained SystemExit if file is found at path + tmp_suffix."""
58 path_tmp = path + tmp_suffix
59 msg = "Found file '" + path_tmp + "' that may be a leftover from an " \
60 "aborted previous attempt to write '" + path + "'. Aborting until " \
61 "the matter is resolved by removing it from its current path."
62 if os.access(path_tmp, os.F_OK):
66 def obey(cmd, io_db, prefix):
69 print("input " + prefix + ": " + cmd)
71 tokens = shlex.split(cmd, comments=True)
72 except ValueError as err:
73 print("Can't tokenize command string: " + str(err) + ".")
77 elif "PING" == tokens[0] and 1 == len(tokens):
78 io_db["file_out"].write("PONG\n")
79 elif "QUIT" == tokens[0] and 1 == len(tokens):
80 record("# " + cmd, path_recordfile)
81 raise SystemExit("received QUIT command")
82 elif "MAKE_WORLD" == tokens[0] and 2 == len(tokens):
83 print("I would generate a new world now, if only I knew how.")
86 print("Invalid command/argument, or bad number of tokens.")
89 def record(cmd, io_db):
90 """Append cmd string plus newline to file at path_recordfile. (Atomic.)"""
91 # This misses some optimizations from the original record(), namely only
92 # finishing the atomic write with expensive flush() and fsync() every 15
93 # seconds unless explicitely forced. Implement as needed.
94 path_tmp = io_db["path_record"] + io_db["tmp_suffix"]
95 if os.access(io_db["path_record"], os.F_OK):
96 shutil.copyfile(io_db["path_record"], path_tmp)
97 file = open(path_tmp, "a")
98 file.write(cmd + "\n")
100 os.fsync(file.fileno())
102 if os.access(io_db["path_record"], os.F_OK):
103 os.remove(io_db["path_record"])
104 os.rename(path_tmp, io_db["path_record"])
107 def obey_lines_in_file(path, name):
108 """Call obey() on each line of path's file, use name in input prefix."""
109 file = open(path, "r")
111 for line in file.readlines():
112 obey(line.rstrip(), io_db, name + "file line " + str(line_n))
117 def parse_command_line_arguments():
118 """Return settings values read from command line arguments."""
119 parser = argparse.ArgumentParser()
120 parser.add_argument('-s', nargs='?', type=int, dest='replay', const=1,
122 opts, unknown = parser.parse_known_args()
126 def server_test(io_db):
127 """Ensure valid server out file belonging to current process.
129 On failure, set io_db["kicked_by_rival"] and raise SystemExit.
131 if not os.access(io_db["path_out"], os.F_OK):
132 raise SystemExit("Server output file has disappeared.")
133 file = open(io_db["path_out"], "r")
134 test = file.readline().rstrip("\n")
136 if test != io_db["teststring"]:
137 io_db["kicked_by_rival"] = True
138 msg = "Server test string in server output file does not match. This" \
139 " indicates that the current server process has been " \
140 "superseded by another one."
141 raise SystemExit(msg)
151 opts = parse_command_line_arguments()
152 setup_server_io(io_db)
153 # print("DUMMY: Run game.")
154 if None != opts.replay:
157 print("Replay mode. Auto-replaying up to turn " + str(opts.replay) +
158 " (if so late a turn is to be found).")
159 if not os.access(io_db["path_record"], os.F_OK):
160 raise SystemExit("No record file found to replay.")
162 file = open(io_db["path_record"], "r")
163 prefix = "record file line "
165 while world_db["turn"] < opts.replay:
166 obey(file.readline().rstrip(), io_db, prefix + str(line_n))
169 obey(file.readline().rstrip(), io_db, prefix + str(line_n))
173 if os.access(io_db["path_save"], os.F_OK):
174 obey_lines_in_file(io_db["path_save"], "save")
176 if not os.access(io_db["path_worldconf"], os.F_OK):
177 msg = "No world config file from which to start a new world."
178 raise SystemExit(msg)
179 obey_lines_in_file(io_db["path_worldconf"], "world config ")
180 obey("MAKE_WORLD " + str(int(time.time())), io_db, "in file")
184 except SystemExit as exit:
185 print("ABORTING: " + exit.args[0])
187 print("SOMETHING WENT WRONG IN UNEXPECTED WAYS")
190 cleanup_server_io(io_db)
191 # print("DUMMY: (Clean up C heap.)")