feat: make non stream completion possible to be fully compatible with openaiapi

Author: tikikun

controllers/llamaCPP.cc

@@ -5,6 +5,7 @@
 #include <cstring>
 #include <drogon/HttpResponse.h>
 #include <drogon/HttpTypes.h>
+#include <json/value.h>
 #include <regex>
 #include <string>
 #include <thread>
@@ -28,6 +29,45 @@ std::shared_ptr<State> createState(int task_id, llamaCPP *instance) {
 
 // --------------------------------------------
 
+std::string create_full_return_json(const std::string &id,
+                                    const std::string &model,
+                                    const std::string &content,
+                                    const std::string &system_fingerprint,
+                                    int prompt_tokens, int completion_tokens,
+                                    Json::Value finish_reason = Json::Value()) {
+
+  Json::Value root;
+
+  root["id"] = id;
+  root["model"] = model;
+  root["created"] = static_cast<int>(std::time(nullptr));
+  root["object"] = "chat.completion";
+  root["system_fingerprint"] = system_fingerprint;
+
+  Json::Value choicesArray(Json::arrayValue);
+  Json::Value choice;
+
+  choice["index"] = 0;
+  Json::Value message;
+  message["role"] = "assistant";
+  message["content"] = content;
+  choice["message"] = message;
+  choice["finish_reason"] = finish_reason;
+
+  choicesArray.append(choice);
+  root["choices"] = choicesArray;
+
+  Json::Value usage;
+  usage["prompt_tokens"] = prompt_tokens;
+  usage["completion_tokens"] = completion_tokens;
+  usage["total_tokens"] = prompt_tokens + completion_tokens;
+  root["usage"] = usage;
+
+  Json::StreamWriterBuilder writer;
+  writer["indentation"] = ""; // Compact output
+  return Json::writeString(writer, root);
+}
+
 std::string create_return_json(const std::string &id, const std::string &model,
                                const std::string &content,
                                Json::Value finish_reason = Json::Value()) {
@@ -82,9 +122,9 @@ void llamaCPP::chatCompletion(
   json data;
   json stopWords;
   // To set default value
-  data["stream"] = true;
 
   if (jsonBody) {
+    data["stream"] = (*jsonBody).get("stream", false).asBool();
     data["n_predict"] = (*jsonBody).get("max_tokens", 500).asInt();
     data["top_p"] = (*jsonBody).get("top_p", 0.95).asFloat();
     data["temperature"] = (*jsonBody).get("temperature", 0.8).asFloat();
@@ -119,62 +159,87 @@ void llamaCPP::chatCompletion(
     data["stop"] = stopWords;
   }
 
+  bool is_streamed = data["stream"];
+
   const int task_id = llama.request_completion(data, false, false);
   LOG_INFO << "Resolved request for task_id:" << task_id;
 
-  auto state = createState(task_id, this);
+  if (is_streamed) {
+    auto state = createState(task_id, this);
 
-  auto chunked_content_provider =
-      [state](char *pBuffer, std::size_t nBuffSize) -> std::size_t {
-    if (!pBuffer) {
-      LOG_INFO << "Connection closed or buffer is null. Reset context";
-      state->instance->llama.request_cancel(state->task_id);
-      return 0;
-    }
-    if (state->isStopped) {
-      return 0;
-    }
-
-    task_result result = state->instance->llama.next_result(state->task_id);
-    if (!result.error) {
-      const std::string to_send = result.result_json["content"];
-      const std::string str =
-          "data: " +
-          create_return_json(nitro_utils::generate_random_string(20), "_",
-                             to_send) +
-          "\n\n";
-
-      std::size_t nRead = std::min(str.size(), nBuffSize);
-      memcpy(pBuffer, str.data(), nRead);
+    auto chunked_content_provider =
+        [state](char *pBuffer, std::size_t nBuffSize) -> std::size_t {
+      if (!pBuffer) {
+        LOG_INFO << "Connection closed or buffer is null. Reset context";
+        state->instance->llama.request_cancel(state->task_id);
+        return 0;
+      }
+      if (state->isStopped) {
+        return 0;
+      }
 
-      if (result.stop) {
+      task_result result = state->instance->llama.next_result(state->task_id);
+      if (!result.error) {
+        const std::string to_send = result.result_json["content"];
         const std::string str =
             "data: " +
-            create_return_json(nitro_utils::generate_random_string(20), "_", "",
-                               "stop") +
-            "\n\n" + "data: [DONE]" + "\n\n";
+            create_return_json(nitro_utils::generate_random_string(20), "_",
+                               to_send) +
+            "\n\n";
 
-        LOG_VERBOSE("data stream", {{"to_send", str}});
         std::size_t nRead = std::min(str.size(), nBuffSize);
         memcpy(pBuffer, str.data(), nRead);
-        LOG_INFO << "reached result stop";
-        state->isStopped = true;
-        state->instance->llama.request_cancel(state->task_id);
+
+        if (result.stop) {
+          const std::string str =
+              "data: " +
+              create_return_json(nitro_utils::generate_random_string(20), "_",
+                                 "", "stop") +
+              "\n\n" + "data: [DONE]" + "\n\n";
+
+          LOG_VERBOSE("data stream", {{"to_send", str}});
+          std::size_t nRead = std::min(str.size(), nBuffSize);
+          memcpy(pBuffer, str.data(), nRead);
+          LOG_INFO << "reached result stop";
+          state->isStopped = true;
+          state->instance->llama.request_cancel(state->task_id);
+          return nRead;
+        }
         return nRead;
+      } else {
+        return 0;
       }
-      return nRead;
-    } else {
       return 0;
-    }
-    return 0;
-  };
-  auto resp = nitro_utils::nitroStreamResponse(chunked_content_provider,
-                                               "chat_completions.txt");
-  callback(resp);
+    };
+    auto resp = nitro_utils::nitroStreamResponse(chunked_content_provider,
+                                                 "chat_completions.txt");
+    callback(resp);
 
-  return;
+    return;
+  } else {
+    Json::Value respData;
+    auto resp = nitro_utils::nitroHttpResponse();
+    respData["testing"] = "thunghiem value moi";
+    if (!json_value(data, "stream", false)) {
+      std::string completion_text;
+      task_result result = llama.next_result(task_id);
+      if (!result.error && result.stop) {
+        int prompt_tokens = result.result_json["tokens_evaluated"];
+        int predicted_tokens = result.result_json["tokens_predicted"];
+        std::string full_return =
+            create_full_return_json(nitro_utils::generate_random_string(20),
+                                    "_", result.result_json["content"], "_",
+                                    prompt_tokens, predicted_tokens);
+        resp->setBody(full_return);
+      } else {
+        resp->setBody("internal error during inference");
+        return;
+      }
+      callback(resp);
+      return;
+    }
+  }
 }
-
 void llamaCPP::embedding(
     const HttpRequestPtr &req,
     std::function<void(const HttpResponsePtr &)> &&callback) {
@@ -262,7 +327,8 @@ void llamaCPP::loadModel(
     this->pre_prompt =
         (*jsonBody)
             .get("pre_prompt",
-                 "A chat between a curious user and an artificial intelligence "
+                 "A chat between a curious user and an artificial "
+                 "intelligence "
                  "assistant. The assistant follows the given rules no matter "
                  "what.\\n")
             .asString();