Before a provider sends or forwards a call's result or error, it sends the origin's
waiting state, past the window if it is full, so a resolved call's changes are
applied on the page. TuiScope.optimistic shows a value while calls are pending; the
guide shows useOptimistic over a Chord reference; example 63.
The four telemetry gaps (rows on commits, chord.host, microsecond times, a read-only store) and: pages record and
send span batches over their link to the server's ingest object (checked, capped, rate-limited, stamped browser and
with the link's principal); workers send theirs too, so the server is the store's only writer; principalAttributes
lets an app choose what a span records about its principal. The tutorial shows a real page's click traced to the
worker, with the trace viewer.
Chord's telemetry schema; spans for calls, methods, relays, holds, activations, natives, loads, reloads, resolves,
revocations, routines, jobs and HTTP requests; trace carriers on hold and call (bounded, printable ASCII) continued by
relays and workers; events and host-wide metrics; the app kit passes an adapter to its hosts. renderTrace escapes
control characters. Example 62 prints a trace across three hosts.
defineMessages with typed t, t.message/t.render for messages as data, the Translations registry with fallbacks and
conflicts, a locale preference per principal with the device as default and a live switch, useMessages and
scope.messages, formatTime/formatNumber. The tutorial gains a chapter on languages.
self.query(table, q, limit) runs before the object goes live and again in the commit step of every commit that
touched the table, publishing only the diff; a reload swaps the object. The tutorial and 59-chat use it.
- get, hold and registry on a host that has not loaded throw not_ready at once.
- A registry with contributions and no provider is reported (registry_undeclared) at publication.
- A request waiting unbound is reported once after 5 s (unbound_long; one clock per host), and keeps waiting.
- An invalid plugin name makes load and reload throw before any change.
- A transaction cancelled by the end of its context is reported (transaction_cancelled) besides rejecting.
- Docs: who a reference acts as, no per-link call limit, await what you start in a root or a handler.
src/next is src (the main export), src/next-node is src/node with short subpaths (/http, /workers, /plugins,
/plugins/runtime, /app, /surfaces, /web, /react, /tui, /tui/launcher); the foundations get /json and /watch;
Chord v1 moves to src/old (/old, /old/node) until p2 runs on v2; tests and docs move likewise (test/, docs/,
test/old, docs/old). Durable and env import the foundations from their subpaths.
2026-11-02 22:36:55 +00:00
Renamed from packages/chord/docs/next/guide-plugins-hosts/book.md (Browse further)
