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[helpers] Provide calls to get free heap and largest available block. (#7978)

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This commit is contained in:
Clyde Stubbs
2024-12-19 14:40:08 +11:00
committed by GitHub
parent ac631711ab
commit b33b4481ea
3 changed files with 61 additions and 46 deletions
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34
esphome/components/json/json_util.cpp
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@@ -1,38 +1,20 @@
#include "json_util.h"
#include "esphome/core/log.h"
#ifdef USE_ESP8266
#include <Esp.h>
#endif
#ifdef USE_ESP32
#include <esp_heap_caps.h>
#endif
#ifdef USE_RP2040
#include <Arduino.h>
#endif
namespace esphome {
namespace json {
static const char *const TAG = "json";
static std::vector<char> global_json_build_buffer; // NOLINT
static const auto ALLOCATOR = RAMAllocator<uint8_t>(RAMAllocator<uint8_t>::ALLOC_INTERNAL);
std::string build_json(const json_build_t &f) {
// Here we are allocating up to 5kb of memory,
// with the heap size minus 2kb to be safe if less than 5kb
// as we can not have a true dynamic sized document.
// The excess memory is freed below with `shrinkToFit()`
#ifdef USE_ESP8266
const size_t free_heap = ESP.getMaxFreeBlockSize(); // NOLINT(readability-static-accessed-through-instance)
#elif defined(USE_ESP32)
const size_t free_heap = heap_caps_get_largest_free_block(MALLOC_CAP_8BIT);
#elif defined(USE_RP2040)
const size_t free_heap = rp2040.getFreeHeap();
#elif defined(USE_LIBRETINY)
const size_t free_heap = lt_heap_get_free();
#endif
auto free_heap = ALLOCATOR.get_max_free_block_size();
size_t request_size = std::min(free_heap, (size_t) 512);
while (true) {
ESP_LOGV(TAG, "Attempting to allocate %u bytes for JSON serialization", request_size);
@@ -67,20 +49,12 @@ bool parse_json(const std::string &data, const json_parse_t &f) {
// with the heap size minus 2kb to be safe if less than that
// as we can not have a true dynamic sized document.
// The excess memory is freed below with `shrinkToFit()`
#ifdef USE_ESP8266
const size_t free_heap = ESP.getMaxFreeBlockSize(); // NOLINT(readability-static-accessed-through-instance)
#elif defined(USE_ESP32)
const size_t free_heap = heap_caps_get_largest_free_block(MALLOC_CAP_8BIT);
#elif defined(USE_RP2040)
const size_t free_heap = rp2040.getFreeHeap();
#elif defined(USE_LIBRETINY)
const size_t free_heap = lt_heap_get_free();
#endif
auto free_heap = ALLOCATOR.get_max_free_block_size();
size_t request_size = std::min(free_heap, (size_t) (data.size() * 1.5));
while (true) {
DynamicJsonDocument json_document(request_size);
if (json_document.capacity() == 0) {
ESP_LOGE(TAG, "Could not allocate memory for JSON document! Requested %u bytes, free heap: %u", request_size,
ESP_LOGE(TAG, "Could not allocate memory for JSON document! Requested %zu bytes, free heap: %zu", request_size,
free_heap);
return false;
}