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Add persistent script storage + hot-reload, verified live

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lua_runtime now loads the running script from a new LittleFS-backed
drivers::storage (joltwallet/littlefs, the project's fifth external
managed component -- mounts the "storage" partition already reserved
in partitions.csv), falling back to the compiled-in default script
only on first boot. transport exposes GET/POST /api/script -- raw Lua
text, not JSON, since json_helpers.h can't round-trip scripts safely
-- relayed to lua_runtime via the same callback-registration pattern
already used for LedColorHandler, keeping transport free of a
dependency on lua_runtime. lua_runtime_reload() persists and hot-swaps
to a fresh Lua state immediately, no reboot.

Verified on real ESP32-C6 hardware: script loads via kvida-sdk, an
edited script hot-reloads within one tick, and the edit survives a
power cycle (proving LittleFS persistence, not just an in-RAM change).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
This commit is contained in:
Ronny Eia
2026-07-12 10:27:00 +02:00
parent eae6d3af5a
commit 967fecbf69
12 changed files with 329 additions and 29 deletions
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14
components/transport/include/mqtt.h
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@@ -1,5 +1,6 @@
#pragma once
#include <cstddef>
#include <cstdint>
namespace kvida {
@@ -29,4 +30,17 @@ void publish_value(const char *name, double value);
using LedColorHandler = void (*)(uint8_t red, uint8_t green, uint8_t blue);
void set_led_color_handler(LedColorHandler handler);
// Same no-dependency-on-other-components pattern as LedColorHandler:
// registered by main so a POST to /api/script can hand the new script to
// `lua_runtime` without transport depending on it. `script` is not
// NUL-terminated by the caller's guarantee -- handlers must use `len`.
using ScriptChangeHandler = void (*)(const char *script, size_t len);
void set_script_change_handler(ScriptChangeHandler handler);
// Registered by main so GET /api/script can pull the currently-running
// script from `lua_runtime`. Called with a buffer of size `cap`; returns
// the number of bytes written (0 if no provider is registered yet).
using ScriptProvider = size_t (*)(char *buf, size_t cap);
void set_script_provider(ScriptProvider provider);
} // namespace kvida