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73 lines
2.5 KiB
C++
73 lines
2.5 KiB
C++
#include "json_util.h"
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#include "esphome/core/log.h"
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#include <ArduinoJson/Memory/Allocator.hpp>
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namespace esphome {
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namespace json {
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static const char *const TAG = "json";
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// Build an allocator for the JSON Library using the RAMAllocator class
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struct SpiRamAllocator : ArduinoJson::Allocator {
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void *allocate(size_t size) override { return this->allocator_.allocate(size); }
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void deallocate(void *pointer) override {
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// RAMAllocator requires passing the size of the allocated space which don't know, so use free directly
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free(pointer); // NOLINT(cppcoreguidelines-owning-memory,cppcoreguidelines-no-malloc)
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}
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void *reallocate(void *ptr, size_t new_size) override {
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return this->allocator_.reallocate(static_cast<uint8_t *>(ptr), new_size);
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}
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protected:
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RAMAllocator<uint8_t> allocator_{RAMAllocator<uint8_t>(RAMAllocator<uint8_t>::NONE)};
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};
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std::string build_json(const json_build_t &f) {
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// NOLINTNEXTLINE(clang-analyzer-cplusplus.NewDeleteLeaks) false positive with ArduinoJson
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auto doc_allocator = SpiRamAllocator();
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JsonDocument json_document(&doc_allocator);
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if (json_document.overflowed()) {
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ESP_LOGE(TAG, "Could not allocate memory for JSON document!");
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return "{}";
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}
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// NOLINTNEXTLINE(clang-analyzer-cplusplus.NewDeleteLeaks) false positive with ArduinoJson
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JsonObject root = json_document.to<JsonObject>();
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f(root);
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if (json_document.overflowed()) {
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ESP_LOGE(TAG, "Could not allocate memory for JSON document!");
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return "{}";
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}
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std::string output;
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serializeJson(json_document, output);
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return output;
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}
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bool parse_json(const std::string &data, const json_parse_t &f) {
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// NOLINTNEXTLINE(clang-analyzer-cplusplus.NewDeleteLeaks) false positive with ArduinoJson
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auto doc_allocator = SpiRamAllocator();
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JsonDocument json_document(&doc_allocator);
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if (json_document.overflowed()) {
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ESP_LOGE(TAG, "Could not allocate memory for JSON document!");
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return false;
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}
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// NOLINTNEXTLINE(clang-analyzer-cplusplus.NewDeleteLeaks) false positive with ArduinoJson
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DeserializationError err = deserializeJson(json_document, data);
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JsonObject root = json_document.as<JsonObject>();
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if (err == DeserializationError::Ok) {
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return f(root);
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} else if (err == DeserializationError::NoMemory) {
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ESP_LOGE(TAG, "Can not allocate more memory for deserialization. Consider making source string smaller");
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return false;
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}
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ESP_LOGE(TAG, "Parse error: %s", err.c_str());
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return false;
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}
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} // namespace json
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} // namespace esphome
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