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tundra/runtime/sms-inbox.py

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+#!/usr/bin/env python3
+# SPDX-License-Identifier: MPL-2.0
+"""Keep oFono incoming messages until Gecko durably acknowledges them."""
+import fcntl
+import json
+import os
+from pathlib import Path
+import time
+import uuid
+
+ROOT = Path('/var/lib/tundra/sms')
+
+
+def transaction(change, root=ROOT, filename="inbox.json"):
+    if filename not in ("inbox.json", "outgoing.json"): raise ValueError("INVALID_SMS_STORE")
+    root.mkdir(parents=True, mode=0o700, exist_ok=True)
+    with (root/'lock').open('a') as lock:
+        fcntl.flock(lock, fcntl.LOCK_EX)
+        path = root/filename
+        rows = json.loads(path.read_text()) if path.exists() else []
+        result = change(rows)
+        temporary = path.with_suffix('.tmp')
+        with open(temporary, 'w', opener=lambda p, f: os.open(p, f, 0o600)) as stream:
+            os.fchmod(stream.fileno(),0o600)
+            json.dump(rows,stream)
+            stream.flush(); os.fsync(stream.fileno())
+        temporary.replace(path)
+        return result
+
+
+def pending():
+    return transaction(lambda rows: rows[:100])
+
+
+def acknowledge(ids):
+    if not isinstance(ids,list) or len(ids)>100 or any(not isinstance(i,str) or len(i)>40 for i in ids):
+        raise ValueError('INVALID_SMS_IDS')
+    def remove(rows):
+        rows[:] = [row for row in rows if row['receipt'] not in ids]
+    transaction(remove)
+    return True
+
+
+def outgoing_state(path):
+    rows = transaction(lambda rows: list(rows), filename='outgoing.json')
+    return next((row['state'] for row in reversed(rows) if row['path'] == path), None)
+
+
+def record_outgoing(path, state):
+    if state not in ('sent','failed'): return
+    def update(rows):
+        rows[:] = [row for row in rows if row['path'] != path][-999:]
+        rows.append({'path':path,'state':state,'timestamp':round(time.time()*1000)})
+    transaction(update, filename='outgoing.json')
+
+
+def main():
+    import dbus
+    from dbus.mainloop.glib import DBusGMainLoop
+    from gi.repository import GLib
+    os.umask(0o077)
+    DBusGMainLoop(set_as_default=True)
+    bus = dbus.SystemBus()
+    def incoming(body, properties):
+        row = {'receipt':str(uuid.uuid4()),'sender':str(properties.get('Sender','')),
+               'body':str(body),'timestamp':round(time.time()*1000)}
+        transaction(lambda rows:rows.append(row))
+    bus.add_signal_receiver(incoming,signal_name='IncomingMessage',
+        dbus_interface='org.ofono.MessageManager',bus_name='org.ofono',path='/ril_0')
+    def outgoing(name, value, path=None):
+        if name == 'State' and path and str(path).startswith('/ril_0/message'):
+            record_outgoing(str(path), str(value))
+    bus.add_signal_receiver(outgoing, signal_name='PropertyChanged',
+        dbus_interface='org.ofono.Message', bus_name='org.ofono', path_keyword='path')
+    GLib.MainLoop().run()
+
+
+if __name__ == '__main__':
+    main()