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 os.remove(io_db[path_key])
50 helper("file_out", "path_out")
51 helper("file_in", "path_in")
52 helper("file_worldstate", "path_worldstate")
55 def detect_atomic_leftover(path, tmp_suffix):
56 """Raise explained SystemExit if file is found at path + tmp_suffix."""
57 path_tmp = path + tmp_suffix
58 msg = "Found file '" + path_tmp + "' that may be a leftover from an " \
59 "aborted previous attempt to write '" + path + "'. Aborting until " \
60 "the matter is resolved by removing it from its current path."
61 if os.access(path_tmp, os.F_OK):
65 def obey(cmd, io_db, prefix):
67 print("input " + prefix + ": " + cmd)
69 tokens = shlex.split(cmd, comments=True)
70 except ValueError as err:
71 print("Can't tokenize command string: " + str(err) + ".")
75 elif "PING" == tokens[0] and 1 == len(tokens):
76 io_db["file_out"].write("PONG\n")
77 elif "QUIT" == tokens[0] and 1 == len(tokens):
78 record("# " + cmd, path_recordfile)
79 raise SystemExit("received QUIT command")
80 elif "MAKE_WORLD" == tokens[0] and 2 == len(tokens):
81 print("I would generate a new world now, if only I knew how.")
84 print("Invalid command/argument, or bad number of tokens.")
87 def record(cmd, io_db):
88 """Append cmd string plus newline to file at path_recordfile. (Atomic.)"""
89 # This misses some optimizations from the original record(), namely only
90 # finishing the atomic write with expensive flush() and fsync() every 15
91 # seconds unless explicitely forced. Implement as needed.
92 path_tmp = io_db["path_record"] + io_db["tmp_suffix"]
93 if os.access(io_db["path_record"], os.F_OK):
94 shutil.copyfile(io_db["path_record"], path_tmp)
95 file = open(path_tmp, "a")
96 file.write(cmd + "\n")
98 os.fsync(file.fileno())
100 if os.access(io_db["path_record"], os.F_OK):
101 os.remove(io_db["path_record"])
102 os.rename(path_tmp, io_db["path_record"])
105 def obey_lines_in_file(path, name):
106 """Call obey() on each line of path's file, use name in input prefix."""
107 file = open(path, "r")
109 for line in file.readlines():
110 obey(line.rstrip(), io_db, name + "file line " + str(line_n))
115 def parse_command_line_arguments():
116 """Return settings values read from command line arguments."""
117 parser = argparse.ArgumentParser()
118 parser.add_argument('-s', nargs='?', type=int, dest='replay', const=1,
120 opts, unknown = parser.parse_known_args()
124 def server_test(io_db):
125 """Ensure valid server out file belonging to current process.
127 On failure, set io_db["kicked_by_rival"] and raise SystemExit.
129 if not os.access(io_db["path_out"], os.F_OK):
130 raise SystemExit("Server output file has disappeared.")
131 file = open(io_db["path_out"], "r")
132 test = file.readline().rstrip("\n")
134 if test != io_db["teststring"]:
135 io_db["kicked_by_rival"] = True
136 msg = "Server test string in server output file does not match. This" \
137 " indicates that the current server process has been " \
138 "superseded by another one."
139 raise SystemExit(msg)
149 opts = parse_command_line_arguments()
150 setup_server_io(io_db)
151 # print("DUMMY: Run game.")
152 if None != opts.replay:
155 print("Replay mode. Auto-replaying up to turn " + str(opts.replay) +
156 " (if so late a turn is to be found).")
157 if not os.access(io_db["path_record"], os.F_OK):
158 raise SystemExit("No record file found to replay.")
160 file = open(io_db["path_record"], "r")
161 prefix = "record file line "
163 while world_db["turn"] < opts.replay:
165 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.)")