my.instagram: add initial all.py + some experiments on nicer errors

my/instagram/all.py

@@ -0,0 +1,33 @@
+from typing import Iterator
+
+from my.core import Res, stat, Stats
+from my.core.source import import_source
+
+from .common import Message, _merge_messages
+
+
+src_gdpr = import_source(module_name='my.instagram.gdpr')
+@src_gdpr
+def _messages_gdpr() -> Iterator[Res[Message]]:
+    from . import gdpr
+    yield from gdpr.messages()
+
+
+src_android = import_source(module_name='my.instagram.android')
+@src_android
+def _messages_android() -> Iterator[Res[Message]]:
+    from . import android
+    yield from android.messages()
+
+
+def messages() -> Iterator[Res[Message]]:
+    # TODO in general best to prefer android, it has more data
+    # but for now prefer gdpr prefix until we figure out how to correlate conversation threads
+    yield from _merge_messages(
+        _messages_gdpr(),
+        _messages_android(),
+    )
+
+
+def stats() -> Stats:
+    return stat(messages)