The demo endpoint lost its session on nearly every second message: affinity
required clients to re-echo the assistant reply byte-identically, so clients
that strip <think> blocks or reshape whitespace (Open WebUI, litellm) missed
every turn, opened a fresh escrow session on the next free single-slot
supplier, and left the old one pinned. Open WebUI's background title/tag-gen
requests each pinned another supplier — one message could exhaust all three
kimi replicas ("no available chat supplier").
- affinity: lenient assistant-content matching (think-strip + whitespace
collapse); user/system/tool messages and tool_calls stay byte-strict;
strict prefixes outrank lenient ones. The mirror is never rewritten with
client text, so receipt hashes stay valid.
- demoChat: trim trailing assistant/system messages (regenerate semantics)
instead of 400 "the last message must have role user or tool".
- supplier: roll the transcript back when the LLM call fails so retries
don't duplicate the delta (ChatSessionStore.truncateTranscript).
- demoChat: LRU-evict a demo session when no supplier is available (supplier
/v1/chat/end frees the slot, sweeper Accepts the escrow) and retry the
open with selectCandidates ignoreStatusFor to bypass the ~20s-stale
indexer status poll. Max 2 evictions per request.
- sweeper: idle janitor closes demo sessions unused for DEMO_SESSION_IDLE_MS
(default 3 min, below the supplier's 5 min CHAT_IDLE_TIMEOUT_MS) so
abandoned one-off sessions release their suppliers quickly.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
MVP demo: one operator-funded API key anyone can plug into an IDE/harness,
running real escrow-per-session marketplace conversations (llm.chat.v1)
behind the standard OpenAI /chat/completions wire shape.
- shared: ChatMessage gains tool role + tool_calls; normalizeChatMessage/
chatMessagesEquivalent keep supplier transcript and gateway mirror
hash-identical for receipts (field presence is part of the identity)
- supplier: /v1/chat/message accepts {messages,tools,tool_choice} alongside
legacy {content}; callOpenAiStream forwards tools, accumulates fragmented
delta.tool_calls, allows content-less tool turns; done frame carries the
assistant message verbatim + finish_reason + usage
- gateway: demo flag on api_keys (additive migration), create-demo-key CLI,
withdraw 403 + hidden deposit address for demo keys, per-IP demo rate
limit (demo keys skip the shared per-key limit), models filtered to chat
capability
- gateway executor (demoChat.ts): transcript-prefix affinity maps stateless
calls onto open sessions, forwards only unseen deltas, transparently
reopens on supplier idle-close; never falls back to one-shot (its settle
path assumes <=1 in-flight escrow per wallet)
- mutex scope: key mutex held only for chain work (open/close); off-chain
turns serialize on per-session locks so replicas serve users concurrently
- sweeper: chat-aware reclaim guard (35min vs 11min) and abandoned-session
cleanup; terminal state confirmed via on-chain queryUtxo (indexer keeps
lineage rows at their old state forever)
- deploy: kimi-chat replicas 2+3 compose files; chat idle timeout 2.5min
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
