be more tolerant on fifo writing

[mtxbot.git] / src / mtxbot-post.py

diff --git a/src/mtxbot-post.py b/src/mtxbot-post.py
index 8d1fac8910ca76fb3f80df288247c13c8050e726..d1f713f07bdd2cf2dbb788d3fbf60292b800741d 100755 (executable)
--- a/src/mtxbot-post.py
+++ b/src/mtxbot-post.py
@@ -1,20 +1,47 @@
 #!/usr/bin/env python3
 
+import argparse
+import base64
 import errno
+import markdown2
 import os
 import posix
+import random
 import stat
+import string
 import sys
 import time
 
 assert sys.version_info >= (3, 5)
 
-if len(sys.argv) != 2:
-    print("Usage: %s <channel>" % sys.argv[0])
-    sys.exit(1)
+FRAG_LEN = 1024
+
+def send_line(line):
+    for i in range(0, 10):
+        fifo = -1
+        try:
+            fifo = posix.open(fifo_path, posix.O_WRONLY | posix.O_NONBLOCK)
+            posix.write(fifo, line)
+            return
+        except OSError as e:
+            if e.errno == errno.ENXIO or e.errno == errno.EAGAIN:
+                time.sleep(1.0)
+        finally:
+            if fifo != -1:
+                posix.close(fifo)
+    raise Exception("Error sending line!")
+
+parser = argparse.ArgumentParser(description='Post message using Matrix Bot.')
+parser.add_argument('channel', type=str, help='channel to be used for posting')
+parser.add_argument('--html', action='store_true', dest='is_html',
+                    default=False, help='post html message')
+parser.add_argument('--markdown', action='store_true', dest='is_markdown',
+                    default=False, help='post markdown message')
+
+args = parser.parse_args()
 
 fifo_dir = os.getenv('MTXBOT_FIFO_DIR', '/run/mtxbot')
-fifo_path = "%s/%s" % (fifo_dir, sys.argv[1])
+fifo_path = "%s/%s" % (fifo_dir, args.channel)
 
 if not os.path.isdir(fifo_dir):
     print("Fifo directory %s does not exist!" % fifo_dir, file=sys.stderr)
@@ -22,21 +49,21 @@ if not os.path.isdir(fifo_dir):
 
 if not ( os.path.exists(fifo_path) and
          stat.S_ISFIFO(os.stat(fifo_path).st_mode) ):
-    print("Channel %s does not exist!" % sys.argv[1], file=sys.stderr)
+    print("Channel %s does not exist!" % args.channel, file=sys.stderr)
     sys.exit(3)
 
-for i in range(0, 10):
-    fifo = -1
-    try:
-        fifo = posix.open(fifo_path, posix.O_WRONLY | posix.O_NONBLOCK)
-        posix.write(fifo, sys.stdin.read().encode())
-        sys.exit(0)
-    except OSError as e:
-        if e.errno == errno.ENXIO:
-            time.sleep(1.0)
-    finally:
-        if fifo != -1:
-            posix.close(fifo)
-
-print("Error posting to channel %s!" % sys.argv[1], file=sys.stderr)
-sys.exit(4)
+in_raw = sys.stdin.read()
+
+if args.is_markdown:
+    in_raw = markdown2.markdown(in_raw)
+
+in_bytes = in_raw.encode("UTF-8")
+in_b64 = base64.b64encode(in_bytes).decode("UTF-8")
+
+msg_id = ''.join(random.choices(string.ascii_uppercase + string.digits, k=5))
+msg_fmt = 'HTML' if (args.is_html or args.is_markdown) else 'PLAIN'
+msg_len = len(in_b64) // FRAG_LEN + (0 if len(in_b64) % FRAG_LEN == 0 else 1)
+
+send_line( ("%s %s %d\n" % (msg_id, msg_fmt, msg_len)).encode("UTF-8") )
+for i in range(0, len(in_b64), FRAG_LEN):
+    send_line( ("%s %d %s\n" % (msg_id, i//FRAG_LEN, in_b64[i:i+FRAG_LEN])).encode("UTF-8") )