From f6f6c07a1be0c98169dc1bde389785b01776c89b Mon Sep 17 00:00:00 2001
From: Matti Airas <matti.airas@hatlabs.fi>
Date: Tue, 16 Apr 2024 15:13:37 +0300
Subject: [PATCH] Pass received Json objects always by value

---
 src/sensesp/signalk/signalk_ws_client.cpp | 27 ++++++++++++++---------
 src/sensesp/signalk/signalk_ws_client.h   |  4 ++--
 2 files changed, 18 insertions(+), 13 deletions(-)

diff --git a/src/sensesp/signalk/signalk_ws_client.cpp b/src/sensesp/signalk/signalk_ws_client.cpp
index fc458139b..9fc7fb61d 100644
--- a/src/sensesp/signalk/signalk_ws_client.cpp
+++ b/src/sensesp/signalk/signalk_ws_client.cpp
@@ -65,7 +65,7 @@ static void websocket_event_handler(void* handler_args, esp_event_base_t base,
     case WEBSOCKET_EVENT_DATA:
       // check if the payload is text)
       if (data->op_code == 0x01) {
-        ws_client->on_receive_delta((uint8_t*)data->data_ptr);
+        ws_client->on_receive_delta((uint8_t*)data->data_ptr, data->data_len);
       }
       break;
     case WEBSOCKET_EVENT_ERROR:
@@ -206,14 +206,19 @@ void SKWSClient::subscribe_listeners() {
  *
  * @param payload
  */
-void SKWSClient::on_receive_delta(uint8_t* payload) {
+void SKWSClient::on_receive_delta(uint8_t* payload, size_t length) {
+  // Need to work on null-terminated strings
+  char buf[length + 1];
+  memcpy(buf, payload, length);
+  buf[length] = 0;
+
 #ifdef SIGNALK_PRINT_RCV_DELTA
-  debugD("Websocket payload received: %s", (char*)payload);
+  debugD("Websocket payload received: %s", (char*)buf);
 #endif
 
   JsonDocument message;
   // JsonObject message = jsonDoc.as<JsonObject>();
-  auto error = deserializeJson(message, payload);
+  auto error = deserializeJson(message, buf);
 
   if (!error) {
     if (message.containsKey("updates")) {
@@ -251,13 +256,11 @@ void SKWSClient::on_receive_updates(JsonDocument& message) {
     JsonArray values = update["values"];
 
     for (size_t vi = 0; vi < values.size(); vi++) {
-      JsonObject value = values[vi];
-
-      const char* path = value["path"];
+      JsonDocument value_doc = JsonDocument((JsonObject)values[vi]);
 
       // push all values into a separate list for processing
       // in the main task
-      received_updates_.push_back(value);
+      received_updates_.push_back(value_doc);
     }
   }
   release_received_updates_semaphore();
@@ -279,9 +282,10 @@ void SKWSClient::process_received_updates() {
   take_received_updates_semaphore();
   int num_updates = received_updates_.size();
   while (!received_updates_.empty()) {
-    JsonObject value = received_updates_.front();
-    received_updates_.pop_front();
-    const char* path = value["path"];
+    JsonDocument& doc = received_updates_.front();
+
+    const char* path = doc["path"];
+    JsonObject value = doc.as<JsonObject>();
 
     for (size_t i = 0; i < listeners.size(); i++) {
       SKListener* listener = listeners[i];
@@ -296,6 +300,7 @@ void SKWSClient::process_received_updates() {
         listener->parse_value(value);
       }
     }
+    received_updates_.pop_front();
   }
   release_received_updates_semaphore();
   delta_rx_count_producer_.set(num_updates);
diff --git a/src/sensesp/signalk/signalk_ws_client.h b/src/sensesp/signalk/signalk_ws_client.h
index de9f68389..6ba7f027b 100644
--- a/src/sensesp/signalk/signalk_ws_client.h
+++ b/src/sensesp/signalk/signalk_ws_client.h
@@ -70,7 +70,7 @@ class SKWSClient : public Configurable,
   void on_disconnected();
   void on_error();
   void on_connected();
-  void on_receive_delta(uint8_t* payload);
+  void on_receive_delta(uint8_t* payload, size_t length);
   void on_receive_updates(JsonDocument& message);
   void on_receive_put(JsonDocument& message);
   void connect();
@@ -120,7 +120,7 @@ class SKWSClient : public Configurable,
 
   SemaphoreHandle_t received_updates_semaphore_ =
       xSemaphoreCreateRecursiveMutex();
-  std::list<JsonObject> received_updates_;
+  std::list<JsonDocument> received_updates_;
 
   /////////////////////////////////////////////////////////
   // methods for all tasks