Server/py: Minor text improvements. Handle no-records-file case.

[plomrogue] / plomrogue-server.py

diff --git a/plomrogue-server.py b/plomrogue-server.py
index f78d12b71a932c4f8b7616ed8e967b41d4971ed9..a1717a71bdd5dcf0871938600b046b785c342678 100755 (executable)
--- a/plomrogue-server.py
+++ b/plomrogue-server.py
@@ -1,8 +1,15 @@
+import argparse
 import errno
 import os
 import time
 
 
+class HandledException(Exception):
+    """Feature-less Exception child. Use for expected operational errors."""
+
+    pass
+
+
 def setup_server_io(io_db):
     """Fill IO files DB with proper file( path)s. Write process IO test string.
 
@@ -28,25 +35,62 @@ def setup_server_io(io_db):
 
 
 def cleanup_server_io(io_db):
-    """Close and remove all files in IO files DB."""
-    io_db["file_out"].close()
-    os.remove(io_db["path_out"])
-    io_db["file_in"].close()
-    os.remove(io_db["path_in"])
-    if "file_worldstate" in io_db:                    # This file's only set up
-        io_db["file_worldstate"].close()              # properly when the game
-    if os.access(io_db["path_worldstate"], os.F_OK):  # world is active, which
-        os.remove(io_db["path_worldstate"])           # is not guaranteed.
+    """Close and remove all files open in IO files DB."""
+    def helper(file_key, path_key):
+        if file_key in io_db:
+            io_db[file_key].close()
+            os.remove(io_db[path_key])
+    helper("file_out", "path_out")
+    helper("file_in", "path_in")
+    helper("file_worldstate", "path_worldstate")
+
+
+def detect_atomic_leftover(path):
+    """Raise explained HandledException if file is found at path + "_tmp"."""
+    path_tmp = path + "_tmp"
+    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."
+    if os.access(path_tmp, os.F_OK):
+        raise HandledException(msg)
+
+
+def obey(msg):
+    """"""
+    print("Input: " + msg)
+
 
 io_db = {}
 try:
-    print("DUMMY: Obey command-line arguments.")
-    print("DUMMY: Open files.")
+    parser = argparse.ArgumentParser()
+    parser.add_argument('-s', nargs='?', type=int, dest='replay', const=1,
+                        action='store')
+    opts, unknown = parser.parse_known_args()
     setup_server_io(io_db)
-    print("DUMMY: Run game.")
+    # 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_savefile, os.F_OK):
+            raise HandledException("No record file found to replay.")
+    elif os.access(path_savefile, os.F_OK):
+        print(open(path_savefile, "r").read())
+    else:
+        msg = "MAKE_WORLD " + str(int(time.time()))
+        obey(msg)
+except SystemExit:
+    pass
+except HandledException as exception:
+    print("ABORTING: " + exception.args[0])
 except:
-    print("SOMETHING WENT WRONG\n")
+    print("SOMETHING WENT WRONG IN UNEXPECTED WAYS")
     raise
 finally:
     cleanup_server_io(io_db)
-    print("DUMMY: (Clean up C heap.)")
+    # print("DUMMY: (Clean up C heap.)")