standalone w/ web server for testing

lib_standalone/AsyncJson.h

@@ -0,0 +1,163 @@
+
+#ifndef ASYNC_JSON_H_
+#define ASYNC_JSON_H_
+#include <ArduinoJson.h>
+#include <ESPAsyncWebServer.h>
+// #include <Print.h>
+
+#define DYNAMIC_JSON_DOCUMENT_SIZE 1024
+
+constexpr const char * JSON_MIMETYPE = "application/json";
+
+/*
+ * Json Response
+ * */
+
+class ChunkPrint : public Print {
+  private:
+    uint8_t * _destination;
+    size_t    _to_skip;
+    size_t    _to_write;
+    size_t    _pos;
+
+  public:
+    ChunkPrint(uint8_t * destination, size_t from, size_t len)
+        : _destination(destination)
+        , _to_skip(from)
+        , _to_write(len)
+        , _pos{0} {
+    }
+    virtual ~ChunkPrint() {
+    }
+    size_t write(uint8_t c) {
+        if (_to_skip > 0) {
+            _to_skip--;
+            return 1;
+        } else if (_to_write > 0) {
+            _to_write--;
+            _destination[_pos++] = c;
+            return 1;
+        }
+        return 0;
+    }
+    size_t write(const uint8_t * buffer, size_t size) {
+        return this->Print::write(buffer, size);
+    }
+};
+
+class AsyncJsonResponse  {
+  protected:
+
+    DynamicJsonDocument _jsonBuffer;
+
+    JsonVariant _root;
+    bool        _isValid;
+
+  public:
+    AsyncJsonResponse(bool isArray = false, size_t maxJsonBufferSize = DYNAMIC_JSON_DOCUMENT_SIZE)
+        : _jsonBuffer(maxJsonBufferSize)
+        , _isValid{false} {
+        if (isArray)
+            _root = _jsonBuffer.createNestedArray();
+        else
+            _root = _jsonBuffer.createNestedObject();
+    }
+    ~AsyncJsonResponse() {
+    }
+    JsonVariant & getRoot() {
+        return _root;
+    }
+    bool _sourceValid() const {
+        return _isValid;
+    }
+    size_t setLength() {
+return 0;
+    }
+
+    size_t getSize() {
+        return _jsonBuffer.size();
+    }
+
+    size_t _fillBuffer(uint8_t * data, size_t len) {
+        // ChunkPrint dest(data, 0, len);
+
+        // serializeJson(_root, dest);
+        return len;
+    }
+};
+
+typedef std::function<void(AsyncWebServerRequest * request, JsonVariant & json)> ArJsonRequestHandlerFunction;
+
+class AsyncCallbackJsonWebHandler : public AsyncWebHandler {
+  private:
+  protected:
+    const String                 _uri;
+    WebRequestMethodComposite    _method;
+    ArJsonRequestHandlerFunction _onRequest;
+    size_t                       _contentLength;
+    size_t                       _maxContentLength;
+
+  public:
+    AsyncCallbackJsonWebHandler(const String & uri, ArJsonRequestHandlerFunction onRequest, size_t maxJsonBufferSize = DYNAMIC_JSON_DOCUMENT_SIZE)
+        : _uri(uri)
+        , _method(HTTP_POST | HTTP_PUT | HTTP_PATCH)
+        , _onRequest(onRequest)
+        , _maxContentLength(16384) {
+    }
+
+    void setMethod(WebRequestMethodComposite method) {
+        _method = method;
+    }
+    void setMaxContentLength(int maxContentLength) {
+        _maxContentLength = maxContentLength;
+    }
+    void onRequest(ArJsonRequestHandlerFunction fn) {
+        _onRequest = fn;
+    }
+
+    virtual bool canHandle(AsyncWebServerRequest * request) override final {
+        if (!_onRequest)
+            return false;
+
+        if (!(_method & request->method()))
+            return false;
+
+        request->addInterestingHeader("ANY");
+        return true;
+    }
+
+    virtual void handleRequest(AsyncWebServerRequest * request) override final {
+        if (_onRequest) {
+            if (request->_tempObject != NULL) {
+                DynamicJsonDocument  jsonBuffer(1024);
+                DeserializationError error = deserializeJson(jsonBuffer, (uint8_t *)(request->_tempObject));
+                if (!error) {
+                    JsonVariant json = jsonBuffer.as<JsonVariant>();
+
+                    _onRequest(request, json);
+                    return;
+                }
+            }
+            request->send(_contentLength > _maxContentLength ? 413 : 400);
+        } else {
+            request->send(500);
+        }
+    }
+    virtual void handleUpload(AsyncWebServerRequest * request, const String & filename, size_t index, uint8_t * data, size_t len, bool final) override final {
+    }
+    virtual void handleBody(AsyncWebServerRequest * request, uint8_t * data, size_t len, size_t index, size_t total) override final {
+        if (_onRequest) {
+            _contentLength = total;
+            if (total > 0 && request->_tempObject == NULL && total < _maxContentLength) {
+                request->_tempObject = malloc(total);
+            }
+            if (request->_tempObject != NULL) {
+                memcpy((uint8_t *)(request->_tempObject) + index, data, len);
+            }
+        }
+    }
+    virtual bool isRequestHandlerTrivial() override final {
+        return _onRequest ? false : true;
+    }
+};
+#endif