A better implementation of the Ollama component (#1701)

* Update OllamaModel.py

A draft to synchronize the model using the latest Langflow architecture and to improve it according to the latest Langchain specifications.

* Update OllamaModel.py

Checkout Models from api

* Update OllamaModel.py

* Update OllamaModel.py

---------

Co-authored-by: Gabriel Luiz Freitas Almeida <gabriel@langflow.org>

src/backend/base/langflow/components/models/OllamaModel.py

@@ -1,16 +1,21 @@
-from typing import Dict, List, Optional
 
-# from langchain_community.chat_models import ChatOllama
+from typing import Any, Dict, List, Optional, Union
-from langchain_community.chat_models import ChatOllama
 
+
+
+from langchain_community.chat_models.ollama import ChatOllama
 from langflow.base.constants import STREAM_INFO_TEXT
 from langflow.base.models.model import LCModelComponent
+from langchain_core.caches import BaseCache
 
-# from langchain.chat_models import ChatOllama
 from langflow.field_typing import Text
 
-# whe When a callback component is added to Langflow, the comment must be uncommented.
+
-# from langchain.callbacks.manager import CallbackManager
+import asyncio
+import json
+
+import httpx
+
 
 
 class ChatOllamaComponent(LCModelComponent):
@@ -20,11 +25,19 @@ class ChatOllamaComponent(LCModelComponent):
 
     field_order = [
         "base_url",
+        "headers",
+
+        "keep_alive_flag",
+        "keep_alive",
+
+        "metadata",
         "model",
+
+
         "temperature",
         "cache",
-        "callback_manager",
+
-        "callbacks",
+
         "format",
         "metadata",
         "mirostat",
@@ -54,12 +67,41 @@ class ChatOllamaComponent(LCModelComponent):
             "base_url": {
                 "display_name": "Base URL",
                 "info": "Endpoint of the Ollama API. Defaults to 'http://localhost:11434' if not specified.",
+
+            },
+
+
+            "format": {
+                "display_name": "Format",
+                "info": "Specify the format of the output (e.g., json)",
                 "advanced": True,
             },
+            "headers": {
+                "display_name": "Headers",
+                "advanced": True,
+
+
+            },
+
+            "keep_alive_flag": {
+                "display_name": "Unload interval",
+                "options": ["Keep", "Immediately","Minute", "Hour", "sec" ],
+                "real_time_refresh": True,
+                "refresh_button": True,
+            },
+            "keep_alive": {
+                "display_name": "interval",
+                "info": "How long the model will stay loaded into memory.",
+            },
+
+
+
             "model": {
                 "display_name": "Model Name",
-                "value": "llama2",
+                "options": [],
                 "info": "Refer to https://ollama.ai/library for more models.",
+                "real_time_refresh": True,
+                "refresh_button": True,
             },
             "temperature": {
                 "display_name": "Temperature",
@@ -67,25 +109,8 @@ class ChatOllamaComponent(LCModelComponent):
                 "value": 0.8,
                 "info": "Controls the creativity of model responses.",
             },
-            "cache": {
+
-                "display_name": "Cache",
+
-                "field_type": "bool",
-                "info": "Enable or disable caching.",
-                "advanced": True,
-                "value": False,
-            },
-            ### When a callback component is added to Langflow, the comment must be uncommented. ###
-            # "callback_manager": {
-            #     "display_name": "Callback Manager",
-            #     "info": "Optional callback manager for additional functionality.",
-            #     "advanced": True,
-            # },
-            # "callbacks": {
-            #     "display_name": "Callbacks",
-            #     "info": "Callbacks to execute during model runtime.",
-            #     "advanced": True,
-            # },
-            ########################################################################################
             "format": {
                 "display_name": "Format",
                 "field_type": "str",
@@ -101,20 +126,24 @@ class ChatOllamaComponent(LCModelComponent):
                 "display_name": "Mirostat",
                 "options": ["Disabled", "Mirostat", "Mirostat 2.0"],
                 "info": "Enable/disable Mirostat sampling for controlling perplexity.",
-                "value": "Disabled",
+                "advanced": False,
-                "advanced": True,
+                "real_time_refresh": True,
+                "refresh_button": True,
+
             },
             "mirostat_eta": {
                 "display_name": "Mirostat Eta",
                 "field_type": "float",
                 "info": "Learning rate for Mirostat algorithm. (Default: 0.1)",
                 "advanced": True,
+                "real_time_refresh": True,
             },
             "mirostat_tau": {
                 "display_name": "Mirostat Tau",
                 "field_type": "float",
                 "info": "Controls the balance between coherence and diversity of the output. (Default: 5.0)",
                 "advanced": True,
+                "real_time_refresh": True,
             },
             "num_ctx": {
                 "display_name": "Context Window Size",
@@ -211,21 +240,74 @@ class ChatOllamaComponent(LCModelComponent):
             },
         }
 
+    def update_build_config(self, build_config: dict, field_value: Any, field_name: str | None = None):
+        if field_name == "mirostat":
+            if field_value == "Disabled":
+                build_config["mirostat_eta"]["advanced"] = True
+                build_config["mirostat_tau"]["advanced"] = True
+                build_config["mirostat_eta"]["value"] = None
+                build_config["mirostat_tau"]["value"] = None
+
+            else:
+                build_config["mirostat_eta"]["advanced"] = False
+                build_config["mirostat_tau"]["advanced"] = False
+
+                if field_value == "Mirostat 2.0":
+                    build_config["mirostat_eta"]["value"] = 0.2
+                    build_config["mirostat_tau"]["value"] = 10
+                else:
+                    build_config["mirostat_eta"]["value"] = 0.1
+                    build_config["mirostat_tau"]["value"] = 5
+
+        if field_name == "model":
+            base_url = build_config.get("base_url", {}).get(
+                "value", "http://localhost:11434")
+            build_config["model"]["options"] = self.get_model(
+                base_url + "/api/tags")
+
+        if field_name == "keep_alive_flag":
+            if field_value == "Keep":
+                build_config["keep_alive"]["value"] = "-1"
+                build_config["keep_alive"]["advanced"] = True
+            elif field_value == "Immediately":
+                build_config["keep_alive"]["value"] = "0"
+                build_config["keep_alive"]["advanced"] = True
+            else:
+                build_config["keep_alive"]["advanced"] = False
+
+        return build_config
+    
+
+    
+
+    def get_model(self, url: str) -> List[str]:
+        try:
+            with httpx.Client() as client:
+                response = client.get(url)
+                response.raise_for_status()
+                data = response.json()
+
+                model_names = [model['name']
+                               for model in data.get("models", [])]
+                return model_names
+        except Exception as e:
+            raise ValueError("Could not retrieve models") from e
+            return [""]
+
     def build(
         self,
         base_url: Optional[str],
         model: str,
         input_value: Text,
-        mirostat: Optional[str],
+
+        mirostat: Optional[str],        
         mirostat_eta: Optional[float] = None,
         mirostat_tau: Optional[float] = None,
-        ### When a callback component is added to Langflow, the comment must be uncommented.###
+        
-        # callback_manager: Optional[CallbackManager] = None,
-        # callbacks: Optional[List[Callbacks]] = None,
-        #######################################################################################
         repeat_last_n: Optional[int] = None,
         verbose: Optional[bool] = None,
-        cache: Optional[bool] = None,
+        keep_alive: Optional[int] = None,
+        keep_alive_flag: Optional[str] = None,
         num_ctx: Optional[int] = None,
         num_gpu: Optional[int] = None,
         format: Optional[str] = None,
@@ -244,33 +326,39 @@ class ChatOllamaComponent(LCModelComponent):
         stream: bool = False,
         system_message: Optional[str] = None,
     ) -> Text:
+
         if not base_url:
             base_url = "http://localhost:11434"
 
-        # Mapping mirostat settings to their corresponding values
-        mirostat_options = {"Mirostat": 1, "Mirostat 2.0": 2}
 
-        # Default to 0 for 'Disabled'
-        mirostat_value = mirostat_options.get(mirostat, 0)  # type: ignore
 
-        # Set mirostat_eta and mirostat_tau to None if mirostat is disabled
+        if keep_alive_flag == "Minute":
-        if mirostat_value == 0:
+            keep_alive_instance = f"{keep_alive}m"
-            mirostat_eta = None
+        elif keep_alive_flag == "Hour":
-            mirostat_tau = None
+            keep_alive_instance = f"{keep_alive}h"
+        elif keep_alive_flag == "sec":
+            keep_alive_instance = f"{keep_alive}s"
+        elif keep_alive_flag == "Keep":
+            keep_alive_instance = "-1"
+        elif keep_alive_flag == "Immediately":
+            keep_alive_instance = "0"
+        else:
+            keep_alive_instance = "Invalid option"
+
+        mirostat_instance = 0
+
+        if mirostat == "disable":
+            mirostat_instance = 0
 
         # Mapping system settings to their corresponding values
         llm_params = {
             "base_url": base_url,
-            "cache": cache,
             "model": model,
-            "mirostat": mirostat_value,
+            "mirostat": mirostat_instance,
+            "keep_alive": keep_alive_instance,
             "format": format,
             "metadata": metadata,
             "tags": tags,
-            ## When a callback component is added to Langflow, the comment must be uncommented.##
-            # "callback_manager": callback_manager,
-            # "callbacks": callbacks,
-            #####################################################################################
             "mirostat_eta": mirostat_eta,
             "mirostat_tau": mirostat_tau,
             "num_ctx": num_ctx,