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flow: remote-failover — try peers in order, fall through to local + 6 tests
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(remote-failover addrs fn local) tries fn on each peer in order, moves to the next
on any raised error, and runs the local node if every peer fails. Threads input,
composes in sequences.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
giles
2026-06-06 17:44:04 +00:00
parent e1f802cfff
commit f8722b3b08
5 changed files with 45 additions and 13 deletions
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5
lib/flow/remote.sx
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@@ -10,10 +10,13 @@
;; (flow-remote-unreachable) if the addr is unknown, (flow-remote-no-fn) if the
;; peer does not expose fn.
;; (remote-node addr fn) — a node that runs fn on the peer at addr.
;; (remote-failover addrs fn local) — try fn on each peer in addrs in order; on a
;; raised error move to the next peer; if every peer fails, run the `local`
;; node as a fallback. Threads the input through unchanged.
(define
flow-remote-src
"(define flow-peers (list))\n (define (flow-assoc key alist)\n (if (null? alist)\n #f\n (if (eq? (car (car alist)) key) (car (cdr (car alist))) (flow-assoc key (cdr alist)))))\n (define (flow-peer-register! addr table) (set! flow-peers (cons (list addr table) flow-peers)))\n (define (flow-transport addr fn input)\n (let ((table (flow-assoc addr flow-peers)))\n (if table\n (let ((proc (flow-assoc fn table)))\n (if proc (proc input) (raise (quote flow-remote-no-fn))))\n (raise (quote flow-remote-unreachable)))))\n (define (remote-node addr fn) (lambda (input) (flow-transport addr fn input)))")
"(define flow-peers (list))\n (define (flow-assoc key alist)\n (if (null? alist)\n #f\n (if (eq? (car (car alist)) key) (car (cdr (car alist))) (flow-assoc key (cdr alist)))))\n (define (flow-peer-register! addr table) (set! flow-peers (cons (list addr table) flow-peers)))\n (define (flow-transport addr fn input)\n (let ((table (flow-assoc addr flow-peers)))\n (if table\n (let ((proc (flow-assoc fn table)))\n (if proc (proc input) (raise (quote flow-remote-no-fn))))\n (raise (quote flow-remote-unreachable)))))\n (define (remote-node addr fn) (lambda (input) (flow-transport addr fn input)))\n (define (flow-failover-step addrs fn input local)\n (if (null? addrs)\n (local input)\n (guard (e (#t (flow-failover-step (cdr addrs) fn input local)))\n (flow-transport (car addrs) fn input))))\n (define (remote-failover addrs fn local)\n (lambda (input) (flow-failover-step addrs fn input local)))")
(define
flow-load-remote!