✨ Adds callback based event bus

2026-02-09 22:45:25 +01:00
parent eba00f98cd
commit 5863598fbc
37 changed files with 671 additions and 816 deletions
@@ -0,0 +1,113 @@
+#pragma once
+
+#include <eventbus.hpp>
+#include <pb_encode.h>
+#include <pb_decode.h>
+#include <esp_timer.h>
+#include <esp_log.h>
+#include <cstdio>
+#include <memory>
+
+template <typename ProtoMsg, ProtoMsg (*DefaultsFn)()>
+class ProtoEventStorage {
+  public:
+    ProtoEventStorage(const char* filename, const pb_msgdesc_t* descriptor, size_t maxSize, uint32_t debounceMs = 1000)
+        : _filename(filename), _descriptor(descriptor), _maxSize(maxSize), _debounceMs(debounceMs) {}
+
+    void begin() {
+        ProtoMsg loaded {};
+        loadOrDefault(loaded);
+        EventBus::instance().publish(loaded);
+
+        esp_timer_create_args_t timerArgs {};
+        timerArgs.callback = timerCallback;
+        timerArgs.arg = this;
+        timerArgs.dispatch_method = ESP_TIMER_TASK;
+        timerArgs.name = _filename;
+        esp_timer_create(&timerArgs, &_timer);
+
+        _handle = EventBus::instance().subscribe<ProtoMsg>([this](const ProtoMsg& msg) {
+            _pending = msg;
+            esp_timer_stop(_timer);
+            esp_timer_start_once(_timer, static_cast<uint64_t>(_debounceMs) * 1000);
+        });
+    }
+
+  private:
+    const char* _filename;
+    const pb_msgdesc_t* _descriptor;
+    size_t _maxSize;
+    uint32_t _debounceMs;
+    SubscriptionHandle _handle;
+    ProtoMsg _pending {};
+    esp_timer_handle_t _timer = nullptr;
+
+    static void timerCallback(void* arg) {
+        auto* self = static_cast<ProtoEventStorage*>(arg);
+        self->save(self->_pending);
+    }
+
+    void loadOrDefault(ProtoMsg& outMsg) {
+        FILE* file = fopen(_filename, "rb");
+        if (!file) {
+            ESP_LOGI("ProtoStorage", "No file %s, using defaults", _filename);
+            outMsg = DefaultsFn();
+            return;
+        }
+
+        fseek(file, 0, SEEK_END);
+        long tellResult = ftell(file);
+        fseek(file, 0, SEEK_SET);
+        if (tellResult < 0) {
+            ESP_LOGE("ProtoStorage", "ftell failed for %s", _filename);
+            fclose(file);
+            outMsg = DefaultsFn();
+            return;
+        }
+        size_t size = static_cast<size_t>(tellResult);
+
+        if (size == 0 || size > _maxSize) {
+            ESP_LOGW("ProtoStorage", "Invalid size %zu for %s (max %zu)", size, _filename, _maxSize);
+            fclose(file);
+            outMsg = DefaultsFn();
+            return;
+        }
+
+        auto buffer = std::make_unique<uint8_t[]>(size);
+        size_t read = fread(buffer.get(), 1, size, file);
+        fclose(file);
+        if (read != size) {
+            ESP_LOGE("ProtoStorage", "Read %zu/%zu from %s", read, size, _filename);
+            outMsg = DefaultsFn();
+            return;
+        }
+
+        pb_istream_t stream = pb_istream_from_buffer(buffer.get(), size);
+        if (!pb_decode(&stream, _descriptor, &outMsg)) {
+            ESP_LOGE("ProtoStorage", "Decode failed for %s", _filename);
+            outMsg = DefaultsFn();
+        }
+    }
+
+    void save(const ProtoMsg& msg) {
+        auto buffer = std::make_unique<uint8_t[]>(_maxSize);
+        pb_ostream_t stream = pb_ostream_from_buffer(buffer.get(), _maxSize);
+
+        if (!pb_encode(&stream, _descriptor, &msg)) {
+            ESP_LOGE("ProtoStorage", "Encode failed for %s", _filename);
+            return;
+        }
+
+        FILE* file = fopen(_filename, "wb");
+        if (!file) {
+            ESP_LOGE("ProtoStorage", "Open write failed for %s", _filename);
+            return;
+        }
+
+        size_t written = fwrite(buffer.get(), 1, stream.bytes_written, file);
+        fclose(file);
+        if (written != stream.bytes_written) {
+            ESP_LOGE("ProtoStorage", "Write failed for %s (%zu/%zu)", _filename, written, stream.bytes_written);
+        }
+    }
+};