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next: the real durable-execution KERNEL SERVICE (host_kernel) — RA-live substrate

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Promotes the persistent-kernel spike into a real service. next/kernel/host_kernel.erl: boots
flow_store, registers named behavior flows (blog_digest), then blocks in http:listen so the
er-scheduler + gen_server stay alive across requests. Parameterised flow routes (paths matched by
byte prefix — binary =:= is buggy): GET /flow/start/<category> starts the flow with that category and
returns '<InstanceId>:<status>' (suspended|done); GET /flow/resume/<id> resumes that instance. Path
plumbing (starts_with / last_seg / field) is byte-level for portability.

next/kernel/serve.sh: the persistent service launcher (container entrypoint / local) — loads the
runtime + next/flow + the kernel, then host_kernel:start(); sleep infinity holds stdin so
the listener serves forever. next/tests/host_kernel.sh: drives it over HTTP — 4/4: newsletter →
instance 1 SUSPENDED, urgent → 2 DONE, draft → 3 DONE (skipped), resume 1 in a SEPARATE request →
DONE (durable state persists across requests). serve.sh launcher verified live (bind + start +
resume).

This is the RA-live substrate: a working durable-execution service the host drives over HTTP.
Remaining for RA-live: deploy it (a container/placement), point host/ra.sx's real-eval at it (POST
/flow instead of in-process erlang-eval-ast), route a durable binding to RA. TA-live adds inbox/
outbox routes on the same kernel.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
giles
2026-07-02 17:11:47 +00:00
parent 836d32474f
commit 22e2835bdb
3 changed files with 178 additions and 0 deletions
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next/kernel/serve.sh Executable file
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#!/usr/bin/env bash
# next/kernel/serve.sh — run host_kernel as a PERSISTENT durable-execution service (RA-live substrate).
# Loads the Erlang-on-SX runtime + next/flow + the kernel, then host_kernel:start($KERNEL_PORT) blocks
# in http:listen forever — keeping the er-scheduler + flow_store's gen_server alive so durable flow
# instances survive across requests. Doubles as a container entrypoint and a local launcher. The host's
# RA runner drives it over HTTP (GET /flow/start/<category>, GET /flow/resume/<id>).
set -uo pipefail
cd "${SX_PROJECT_DIR:-$(git rev-parse --show-toplevel 2>/dev/null || echo .)}"
SX_SERVER="${SX_SERVER:-hosts/ocaml/_build/default/bin/sx_server.exe}"
[ -x "$SX_SERVER" ] || SX_SERVER="/root/rose-ash/hosts/ocaml/_build/default/bin/sx_server.exe"
if [ ! -x "$SX_SERVER" ]; then echo "ERROR: sx_server.exe not found." >&2; exit 1; fi
PORT="${KERNEL_PORT:-8930}"
# The epoch stream loads everything then calls start (which blocks in http:listen). `sleep infinity`
# holds stdin open so EOF doesn't exit(0) before/while the listener serves.
{
cat <<EPOCHS
(epoch 1)
(load "lib/erlang/tokenizer.sx")
(load "lib/erlang/parser.sx")
(load "lib/erlang/parser-core.sx")
(load "lib/erlang/parser-expr.sx")
(load "lib/erlang/parser-module.sx")
(load "lib/erlang/transpile.sx")
(load "lib/erlang/runtime.sx")
(load "lib/erlang/vm/dispatcher.sx")
(epoch 2)
(eval "(er-load-gen-server!)")
(eval "(get (erlang-load-module (file-read \"next/kernel/envelope.erl\")) :name)")
(eval "(get (erlang-load-module (file-read \"next/flow/flow.erl\")) :name)")
(eval "(get (erlang-load-module (file-read \"next/flow/flow_spec.erl\")) :name)")
(eval "(get (erlang-load-module (file-read \"next/flow/flow_store.erl\")) :name)")
(eval "(get (erlang-load-module (file-read \"next/flow/flows/blog_publish_digest.erl\")) :name)")
(eval "(get (erlang-load-module (file-read \"next/kernel/host_kernel.erl\")) :name)")
(epoch 3)
(eval "(erlang-eval-ast \"host_kernel:start($PORT)\")")
EPOCHS
sleep infinity
} | exec "$SX_SERVER"