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.
- 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"].
+ 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"
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:
io_db[file_key].close()
- if not io_db["kicked_by_rival"]:
+ 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")
+ if "file_record" in io_db:
+ io_db["file_record"].close()
def detect_atomic_leftover(path, tmp_suffix):
raise SystemExit(msg)
-def obey(cmd, io_db, prefix):
- """"""
- 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")
- 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)
+ 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["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:
+ commands[tokens[0]][2]()
+ if do_record:
+ 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.
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()
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.
- """
+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():
- if None != break_test and break_test():
- break
- 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()
-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()
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.
raise SystemExit(msg)
+def read_command():
+ """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()
+ 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:
if not os.access(io_db["path_record"], os.F_OK):
raise SystemExit("No record file found to replay.")
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?
+ io_db["file_record"] = open(io_db["path_record"], "r")
+ io_db["file_record"].prefix = "recod file line "
+ io_db["file_record"].line_n = 1
+ while world_db["turn"] < opts.replay:
+ line = io_db["file_record"].readline()
+ if "" == line:
+ break
+ 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(), "in file", replay=True)
else:
if os.access(io_db["path_save"], os.F_OK):
obey_lines_in_file(io_db["path_save"], "save")
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")
- while 1:
- server_test(io_db)
- # print("DUMMY: Run io_loop().")
+ obey_lines_in_file(io_db["path_worldconf"], "world config ",
+ do_record=True)
+ obey("MAKE_WORLD " + str(int(time.time())), "in file",
+ do_record=True)
+ while 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.)")
projects / plomrogue / blobdiff