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Code Issues Releases Wiki Activity

[json] Bump ArduinoJson library to 7.4.2 (#8857)

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Co-authored-by: J. Nick Koston <nick@koston.org>
Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>
This commit is contained in:
Kevin Ahrendt
2025-07-15 03:11:10 +01:00
committed by GitHub
parent 8f58ca3a2a
commit 9ae45ba8aa
28 changed files with 164 additions and 129 deletions
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119
esphome/components/json/json_util.cpp
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@@ -1,83 +1,76 @@
#include "json_util.h"
#include "esphome/core/log.h"
// ArduinoJson::Allocator is included via ArduinoJson.h in json_util.h
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);
// Build an allocator for the JSON Library using the RAMAllocator class
struct SpiRamAllocator : ArduinoJson::Allocator {
void *allocate(size_t size) override { return this->allocator_.allocate(size); }
void deallocate(void *pointer) override {
// ArduinoJson's Allocator interface doesn't provide the size parameter in deallocate.
// RAMAllocator::deallocate() requires the size, which we don't have access to here.
// RAMAllocator::deallocate implementation just calls free() regardless of whether
// the memory was allocated with heap_caps_malloc or malloc.
// This is safe because ESP-IDF's heap implementation internally tracks the memory region
// and routes free() to the appropriate heap.
free(pointer); // NOLINT(cppcoreguidelines-owning-memory,cppcoreguidelines-no-malloc)
}
void *reallocate(void *ptr, size_t new_size) override {
return this->allocator_.reallocate(static_cast<uint8_t *>(ptr), new_size);
}
protected:
RAMAllocator<uint8_t> allocator_{RAMAllocator<uint8_t>(RAMAllocator<uint8_t>::NONE)};
};
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()`
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 %zu bytes for JSON serialization", request_size);
DynamicJsonDocument json_document(request_size);
if (json_document.capacity() == 0) {
ESP_LOGE(TAG, "Could not allocate memory for document! Requested %zu bytes, largest free heap block: %zu bytes",
request_size, free_heap);
return "{}";
}
JsonObject root = json_document.to<JsonObject>();
f(root);
if (json_document.overflowed()) {
if (request_size == free_heap) {
ESP_LOGE(TAG, "Could not allocate memory for document! Overflowed largest free heap block: %zu bytes",
free_heap);
return "{}";
}
request_size = std::min(request_size * 2, free_heap);
continue;
}
json_document.shrinkToFit();
ESP_LOGV(TAG, "Size after shrink %zu bytes", json_document.capacity());
std::string output;
serializeJson(json_document, output);
return output;
// NOLINTBEGIN(clang-analyzer-cplusplus.NewDeleteLeaks) false positive with ArduinoJson
auto doc_allocator = SpiRamAllocator();
JsonDocument json_document(&doc_allocator);
if (json_document.overflowed()) {
ESP_LOGE(TAG, "Could not allocate memory for JSON document!");
return "{}";
}
JsonObject root = json_document.to<JsonObject>();
f(root);
if (json_document.overflowed()) {
ESP_LOGE(TAG, "Could not allocate memory for JSON document!");
return "{}";
}
std::string output;
serializeJson(json_document, output);
return output;
// NOLINTEND(clang-analyzer-cplusplus.NewDeleteLeaks)
}
bool parse_json(const std::string &data, const json_parse_t &f) {
// Here we are allocating 1.5 times the data size,
// 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()`
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 document! Requested %zu bytes, free heap: %zu", request_size,
free_heap);
return false;
}
DeserializationError err = deserializeJson(json_document, data);
json_document.shrinkToFit();
// NOLINTBEGIN(clang-analyzer-cplusplus.NewDeleteLeaks) false positive with ArduinoJson
auto doc_allocator = SpiRamAllocator();
JsonDocument json_document(&doc_allocator);
if (json_document.overflowed()) {
ESP_LOGE(TAG, "Could not allocate memory for JSON document!");
return false;
}
DeserializationError err = deserializeJson(json_document, data);
JsonObject root = json_document.as<JsonObject>();
JsonObject root = json_document.as<JsonObject>();
if (err == DeserializationError::Ok) {
return f(root);
} else if (err == DeserializationError::NoMemory) {
if (request_size * 2 >= free_heap) {
ESP_LOGE(TAG, "Can not allocate more memory for deserialization. Consider making source string smaller");
return false;
}
ESP_LOGV(TAG, "Increasing memory allocation.");
request_size *= 2;
continue;
} else {
ESP_LOGE(TAG, "Parse error: %s", err.c_str());
return false;
}
};
if (err == DeserializationError::Ok) {
return f(root);
} else if (err == DeserializationError::NoMemory) {
ESP_LOGE(TAG, "Can not allocate more memory for deserialization. Consider making source string smaller");
return false;
}
ESP_LOGE(TAG, "Parse error: %s", err.c_str());
return false;
// NOLINTEND(clang-analyzer-cplusplus.NewDeleteLeaks)
}
} // namespace json