90 lines
2.9 KiB
C++
90 lines
2.9 KiB
C++
#include "json_util.h"
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#include "esphome/core/log.h"
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#ifdef USE_ESP8266
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#include <Esp.h>
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#endif
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#ifdef USE_ESP32
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#include <esp_heap_caps.h>
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#endif
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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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static std::vector<char> global_json_build_buffer; // NOLINT
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std::string build_json(const json_build_t &f) {
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// Here we are allocating up to 5kb of memory,
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// with the heap size minus 2kb to be safe if less than 5kb
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// as we can not have a true dynamic sized document.
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// The excess memory is freed below with `shrinkToFit()`
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#ifdef USE_ESP8266
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const size_t free_heap = ESP.getMaxFreeBlockSize(); // NOLINT(readability-static-accessed-through-instance)
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#elif defined(USE_ESP32)
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const size_t free_heap = heap_caps_get_largest_free_block(MALLOC_CAP_INTERNAL);
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#endif
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const size_t request_size = std::min(free_heap - 2048, (size_t) 5120);
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DynamicJsonDocument json_document(request_size);
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if (json_document.memoryPool().buffer() == nullptr) {
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ESP_LOGE(TAG, "Could not allocate memory for JSON document! Requested %u bytes, largest free heap block: %u bytes",
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request_size, free_heap);
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return "{}";
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}
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JsonObject root = json_document.to<JsonObject>();
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f(root);
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json_document.shrinkToFit();
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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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void parse_json(const std::string &data, const json_parse_t &f) {
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// Here we are allocating 1.5 times the data size,
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// with the heap size minus 2kb to be safe if less than that
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// as we can not have a true dynamic sized document.
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// The excess memory is freed below with `shrinkToFit()`
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#ifdef USE_ESP8266
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const size_t free_heap = ESP.getMaxFreeBlockSize(); // NOLINT(readability-static-accessed-through-instance)
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#elif defined(USE_ESP32)
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const size_t free_heap = heap_caps_get_largest_free_block(MALLOC_CAP_INTERNAL);
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#endif
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bool pass = false;
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do {
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const size_t request_size = std::min(free_heap - 2048, (size_t)(data.size() * 1.5));
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DynamicJsonDocument json_document(request_size);
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if (json_document.memoryPool().buffer() == nullptr) {
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ESP_LOGE(TAG, "Could not allocate memory for JSON document! Requested %u bytes, free heap: %u", request_size,
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free_heap);
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return;
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}
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DeserializationError err = deserializeJson(json_document, data);
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json_document.shrinkToFit();
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JsonObject root = json_document.as<JsonObject>();
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if (err == DeserializationError::Ok) {
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pass = true;
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f(root);
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} else if (err == DeserializationError::NoMemory) {
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if (request_size * 2 >= free_heap) {
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ESP_LOGE(TAG, "Can not allocate more memory for deserialization. Consider making source string smaller");
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return;
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}
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ESP_LOGW(TAG, "Increasing memory allocation.");
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continue;
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} else {
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ESP_LOGE(TAG, "JSON parse error: %s", err.c_str());
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return;
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}
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} while (!pass);
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}
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} // namespace json
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} // namespace esphome
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