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When edit_message_text exceeded Telegram's 4096 UTF-16 codepoint limit,
the adapter caught the BadRequest, best-effort truncated the content
with '…', and returned SendResult(success=True). The stream consumer
believed the full edit was delivered and never recovered, silently
dropping everything past the truncation boundary on long replies.
Returning failure isn't safe either — the consumer's existing fallback
path can race against the next streaming tick, producing duplicate
sends or gaps. Instead, the adapter now SPLITS the oversized payload
across the existing message + new continuation messages, so the user
always gets the full reply in correct order.
How it works:
1. Pre-flight: if utf16_len(content) already exceeds MAX_MESSAGE_LENGTH,
call the new _edit_overflow_split helper directly — saves a doomed
round-trip + a Telegram error.
2. Reactive: if Telegram still returns 'message_too_long' after the
pre-flight (e.g. parse_mode formatting inflated the payload past
the limit via MarkdownV2 escapes), the same helper handles it.
3. _edit_overflow_split:
- Splits via truncate_message(len_fn=utf16_len) — same chunking the
non-streaming send() path uses; chunks get '(1/N)' suffixes.
- Edits the original message_id with chunk 1 (with parse_mode +
plain-fallback when finalize=True, mirroring the main edit path).
- Sends each remaining chunk via self._bot.send_message threaded as
a reply to the previous chunk so the user sees them as a
contiguous block. MarkdownV2-with-plain-fallback per chunk on
finalize.
- Returns SendResult(success=True, message_id=<last_chunk_id>,
continuation_message_ids=(<chunk2_id>, <chunk3_id>, ...)) so the
stream consumer can keep editing the most recent visible message
and the gateway has full visibility into every message id.
SendResult contract extension:
Added optional continuation_message_ids: tuple = () field. When
empty (the common case), behavior is unchanged. When populated, the
caller knows the adapter delivered across multiple platform messages.
Stream consumer integration:
GatewayStreamConsumer._send_or_edit advances _message_id to the
last-continuation id when it sees continuation_message_ids on a
successful edit result, resets _last_sent_text (the new visible
message holds only the final chunk's text), and fires
on_new_message so tool-progress bubbles linearize below the new
continuation rather than the original. Mirrors the openclaw #32535
inter-tool-leak guard.
Composes with what just landed:
- PR #23455 (UTF-16 length-aware splitting in stream consumer)
prevents most overflows upstream by measuring text in UTF-16
codeunits before deciding to split. This PR is the safety net at
the adapter boundary.
- PR #23512 (native draft streaming, default for DM Telegram) routes
DM streaming through send_draft, which has its own contract
unaffected by this change. So this fix narrows in scope to the
edit-based path: groups, supergroups, forum topics, every
non-Telegram platform, and the per-response fallback after a
draft failure.
Salvage notes:
- Cherry-picked from PR #19537 by @kjames2001. Original PR returned
failure on overflow; this evolves to split-and-deliver so users
never lose content and the consumer state stays consistent.
- Dropped an unrelated model-picker hunk (line 2114-2117) that
silently killed the 'X more available — type /model <name>
directly' hint by hardcoding total=len(models). Not in scope.
- Restored the timeout-aware retryable=not is_timeout signal in
send()'s fallthrough catch block.
Closes #19537.
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| .. | ||
| assets | ||
| builtin_hooks | ||
| platforms | ||
| __init__.py | ||
| channel_directory.py | ||
| config.py | ||
| delivery.py | ||
| display_config.py | ||
| hooks.py | ||
| mirror.py | ||
| pairing.py | ||
| platform_registry.py | ||
| restart.py | ||
| run.py | ||
| runtime_footer.py | ||
| session.py | ||
| session_context.py | ||
| shutdown_forensics.py | ||
| slash_access.py | ||
| status.py | ||
| sticker_cache.py | ||
| stream_consumer.py | ||
| whatsapp_identity.py | ||