add safe-guard

Author: ngxson

tools/server/server-task.cpp

@@ -565,6 +565,7 @@ std::vector<unsigned char> completion_token_output::str_to_bytes(const std::stri
 // server_task_result_cmpl_final
 //
 json server_task_result_cmpl_final::to_json() {
+    GGML_ASSERT(is_updated && "update() must be called before to_json()");
     switch (res_type) {
         case TASK_RESPONSE_TYPE_NONE:
             return to_json_non_oaicompat();
@@ -975,6 +976,7 @@ json server_task_result_cmpl_final::to_json_anthropic_stream() {
 // server_task_result_cmpl_partial
 //
 json server_task_result_cmpl_partial::to_json() {
+    GGML_ASSERT(is_updated && "update() must be called before to_json()");
     switch (res_type) {
         case TASK_RESPONSE_TYPE_NONE:
             return to_json_non_oaicompat();

tools/server/server-task.h

@@ -258,6 +258,7 @@ struct server_task_result_cmpl_final : server_task_result {
     common_chat_msg    oaicompat_msg; // to be populated by update()
 
     std::vector<common_chat_msg_diff> oaicompat_msg_diffs; // to be populated by update()
+    bool is_updated = false;
 
     virtual int get_index() override {
         return index;
@@ -270,6 +271,7 @@ struct server_task_result_cmpl_final : server_task_result {
     virtual json to_json() override;
 
     virtual void update(task_result_state & state) override {
+        is_updated = true;
         oaicompat_msg = state.update_chat_msg(content, false, oaicompat_msg_diffs);
     }
 
@@ -307,6 +309,7 @@ struct server_task_result_cmpl_partial : server_task_result {
     std::string        oaicompat_model;
     std::string        oaicompat_cmpl_id;
     std::vector<common_chat_msg_diff> oaicompat_msg_diffs; // to be populated by update()
+    bool is_updated = false;
 
     virtual int get_index() override {
         return index;
@@ -319,6 +322,7 @@ struct server_task_result_cmpl_partial : server_task_result {
     virtual json to_json() override;
 
     virtual void update(task_result_state & state) override {
+        is_updated = true;
         state.update_chat_msg(content, true, oaicompat_msg_diffs);
     }