feat: Add Multi-Model Provider Support to Agent Component (#4416)

* Add Multi-Model Provider Support to Agent Component

- Integrated model provider constants from `model_input_constants.py` into the Agent component to support multiple LLM providers
- Added dynamic field management for different model providers (OpenAI, Azure, Groq, Anthropic, NVIDIA)
- Implemented a dropdown for model provider selection with automatic input field updates

* sorted list

* Update agent.py

making custom separate from sort

* chore: remove unit test

---------

Co-authored-by: italojohnny <italojohnnydosanjos@gmail.com>

src/backend/base/langflow/base/models/model_input_constants.py

@@ -0,0 +1,71 @@
+from langflow.base.models.model import LCModelComponent
+from langflow.components.models.anthropic import AnthropicModelComponent
+from langflow.components.models.azure_openai import AzureChatOpenAIComponent
+from langflow.components.models.groq import GroqModel
+from langflow.components.models.nvidia import NVIDIAModelComponent
+from langflow.components.models.openai import OpenAIModelComponent
+
+
+def get_filtered_inputs(component_class):
+    base_input_names = {field.name for field in LCModelComponent._base_inputs}
+    return [
+        set_advanced_true(input_) if input_.name == "temperature" else input_
+        for input_ in component_class().inputs
+        if input_.name not in base_input_names
+    ]
+
+
+def set_advanced_true(component_input):
+    component_input.advanced = True
+    return component_input
+
+
+def create_input_fields_dict(inputs, prefix):
+    return {f"{prefix}_{input_.name}": input_ for input_ in inputs}
+
+
+OPENAI_INPUTS = get_filtered_inputs(OpenAIModelComponent)
+AZURE_INPUTS = get_filtered_inputs(AzureChatOpenAIComponent)
+GROQ_INPUTS = get_filtered_inputs(GroqModel)
+ANTHROPIC_INPUTS = get_filtered_inputs(AnthropicModelComponent)
+NVIDIA_INPUTS = get_filtered_inputs(NVIDIAModelComponent)
+
+
+OPENAI_FIELDS = {input_.name: input_ for input_ in OPENAI_INPUTS}
+
+
+AZURE_FIELDS = create_input_fields_dict(AZURE_INPUTS, "azure")
+GROQ_FIELDS = create_input_fields_dict(GROQ_INPUTS, "groq")
+ANTHROPIC_FIELDS = create_input_fields_dict(ANTHROPIC_INPUTS, "anthropic")
+NVIDIA_FIELDS = create_input_fields_dict(NVIDIA_INPUTS, "nvidia")
+
+MODEL_PROVIDERS = ["Azure OpenAI", "OpenAI", "Groq", "Anthropic", "NVIDIA"]
+
+MODEL_PROVIDERS_DICT = {
+    "Azure OpenAI": {
+        "fields": AZURE_FIELDS,
+        "inputs": AZURE_INPUTS,
+        "prefix": "azure_",
+        "component_class": AzureChatOpenAIComponent(),
+    },
+    "OpenAI": {
+        "fields": OPENAI_FIELDS,
+        "inputs": OPENAI_INPUTS,
+        "prefix": "",
+        "component_class": OpenAIModelComponent(),
+    },
+    "Groq": {"fields": GROQ_FIELDS, "inputs": GROQ_INPUTS, "prefix": "groq_", "component_class": GroqModel()},
+    "Anthropic": {
+        "fields": ANTHROPIC_FIELDS,
+        "inputs": ANTHROPIC_INPUTS,
+        "prefix": "anthropic_",
+        "component_class": AnthropicModelComponent(),
+    },
+    "NVIDIA": {
+        "fields": NVIDIA_FIELDS,
+        "inputs": NVIDIA_INPUTS,
+        "prefix": "nvidia_",
+        "component_class": NVIDIAModelComponent(),
+    },
+}
+ALL_PROVIDER_FIELDS: list[str] = [field for provider in MODEL_PROVIDERS_DICT.values() for field in provider["fields"]]

src/backend/base/langflow/components/agents/agent.py

@@ -1,9 +1,7 @@
 from langflow.base.agents.agent import LCToolsAgentComponent
-from langflow.base.models.model import LCModelComponent
+from langflow.base.models.model_input_constants import ALL_PROVIDER_FIELDS, MODEL_PROVIDERS_DICT
 from langflow.components.agents.tool_calling import ToolCallingAgentComponent
 from langflow.components.helpers.memory import MemoryComponent
-from langflow.components.models.azure_openai import AzureChatOpenAIComponent
-from langflow.components.models.openai import OpenAIModelComponent
 from langflow.io import (
     DropdownInput,
     MultilineInput,
@@ -25,30 +23,19 @@ class AgentComponent(ToolCallingAgentComponent):
     beta = True
     name = "Agent"
 
-    azure_inputs = [
-        set_advanced_true(component_input) if component_input.name == "temperature" else component_input
-        for component_input in AzureChatOpenAIComponent().inputs
-        if component_input.name not in [input_field.name for input_field in LCModelComponent._base_inputs]
-    ]
-    openai_inputs = [
-        set_advanced_true(component_input) if component_input.name == "temperature" else component_input
-        for component_input in OpenAIModelComponent().inputs
-        if component_input.name not in [input_field.name for input_field in LCModelComponent._base_inputs]
-    ]
-
     memory_inputs = [set_advanced_true(component_input) for component_input in MemoryComponent().inputs]
 
     inputs = [
         DropdownInput(
             name="agent_llm",
             display_name="Model Provider",
-            options=["Azure OpenAI", "OpenAI", "Custom"],
+            options=[*sorted(MODEL_PROVIDERS_DICT.keys()), "Custom"],
             value="OpenAI",
             real_time_refresh=True,
             refresh_button=True,
             input_types=[],
         ),
-        *openai_inputs,
+        *MODEL_PROVIDERS_DICT["OpenAI"]["inputs"],
         MultilineInput(
             name="system_prompt",
             display_name="Agent Instructions",
@@ -86,71 +73,89 @@ def get_memory_data(self):
         return MemoryComponent().set(**memory_kwargs).retrieve_messages()
 
     def get_llm(self):
-        try:
-            if self.agent_llm == "OpenAI":
-                return self._build_llm_model(OpenAIModelComponent(), self.openai_inputs)
-            if self.agent_llm == "Azure OpenAI":
-                return self._build_llm_model(AzureChatOpenAIComponent(), self.azure_inputs, prefix="azure_param_")
-        except Exception as e:
-            msg = f"Error building {self.agent_llm} language model"
-            raise ValueError(msg) from e
+        if isinstance(self.agent_llm, str):
+            try:
+                provider_info = MODEL_PROVIDERS_DICT.get(self.agent_llm)
+                if provider_info:
+                    component_class = provider_info.get("component_class")
+                    inputs = provider_info.get("inputs")
+                    prefix = provider_info.get("prefix", "")
+                    return self._build_llm_model(component_class, inputs, prefix)
+            except Exception as e:
+                msg = f"Error building {self.agent_llm} language model"
+                raise ValueError(msg) from e
         return self.agent_llm
 
     def _build_llm_model(self, component, inputs, prefix=""):
-        return component.set(
-            **{component_input.name: getattr(self, f"{prefix}{component_input.name}") for component_input in inputs}
-        ).build_model()
+        model_kwargs = {input_.name: getattr(self, f"{prefix}{input_.name}") for input_ in inputs}
+        return component.set(**model_kwargs).build_model()
 
-    def delete_fields(self, build_config, fields):
+    def delete_fields(self, build_config: dotdict, fields: dict | list[str]) -> None:
+        """Delete specified fields from build_config."""
         for field in fields:
             build_config.pop(field, None)
 
-    def update_build_config(self, build_config: dotdict, field_value: str, field_name: str | None = None):
+    def update_input_types(self, build_config: dotdict) -> dotdict:
+        """Update input types for all fields in build_config."""
+        for key, value in build_config.items():
+            if isinstance(value, dict):
+                if value.get("input_types") is None:
+                    build_config[key]["input_types"] = []
+            elif hasattr(value, "input_types") and value.input_types is None:
+                value.input_types = []
+        return build_config
+
+    def update_build_config(self, build_config: dotdict, field_value: str, field_name: str | None = None) -> dotdict:
         if field_name == "agent_llm":
-            openai_fields = {component_input.name: component_input for component_input in self.openai_inputs}
-            azure_fields = {
-                f"azure_param_{component_input.name}": component_input for component_input in self.azure_inputs
+            # Define provider configurations as (fields_to_add, fields_to_delete)
+            provider_configs: dict[str, tuple[dict, list[dict]]] = {
+                provider: (
+                    MODEL_PROVIDERS_DICT[provider]["fields"],
+                    [
+                        MODEL_PROVIDERS_DICT[other_provider]["fields"]
+                        for other_provider in MODEL_PROVIDERS_DICT
+                        if other_provider != provider
+                    ],
+                )
+                for provider in MODEL_PROVIDERS_DICT
             }
 
-            if field_value == "OpenAI":
-                self.delete_fields(build_config, {**azure_fields})
-                if not any(field in build_config for field in openai_fields):
-                    build_config.update(openai_fields)
-                build_config["agent_llm"]["input_types"] = []
-                build_config = self.update_input_types(build_config)
+            if field_value in provider_configs:
+                fields_to_add, fields_to_delete = provider_configs[field_value]
+
+                # Delete fields from other providers
+                for fields in fields_to_delete:
+                    self.delete_fields(build_config, fields)
 
-            elif field_value == "Azure OpenAI":
-                self.delete_fields(build_config, {**openai_fields})
-                build_config.update(azure_fields)
+                # Add provider-specific fields
+                if field_value == "OpenAI" and not any(field in build_config for field in fields_to_add):
+                    build_config.update(fields_to_add)
+                else:
+                    build_config.update(fields_to_add)
+                # Reset input types for agent_llm
                 build_config["agent_llm"]["input_types"] = []
-                build_config = self.update_input_types(build_config)
             elif field_value == "Custom":
-                self.delete_fields(build_config, {**openai_fields})
-                self.delete_fields(build_config, {**azure_fields})
-                new_component = DropdownInput(
+                # Delete all provider fields
+                self.delete_fields(build_config, ALL_PROVIDER_FIELDS)
+                # Update with custom component
+                custom_component = DropdownInput(
                     name="agent_llm",
                     display_name="Language Model",
-                    options=["Azure OpenAI", "OpenAI", "Custom"],
+                    options=[*sorted(MODEL_PROVIDERS_DICT.keys()), "Custom"],
                     value="Custom",
                     real_time_refresh=True,
                     input_types=["LanguageModel"],
                 )
-                build_config.update({"agent_llm": new_component.to_dict()})
-                build_config = self.update_input_types(build_config)
+                build_config.update({"agent_llm": custom_component.to_dict()})
+
+            # Update input types for all fields
+            build_config = self.update_input_types(build_config)
+
+            # Validate required keys
             default_keys = ["code", "_type", "agent_llm", "tools", "input_value"]
             missing_keys = [key for key in default_keys if key not in build_config]
             if missing_keys:
                 msg = f"Missing required keys in build_config: {missing_keys}"
                 raise ValueError(msg)
-        return build_config
 
-    def update_input_types(self, build_config):
-        for key, value in build_config.items():
-            # Check if the value is a dictionary
-            if isinstance(value, dict):
-                if value.get("input_types") is None:
-                    build_config[key]["input_types"] = []
-            # Check if the value has an attribute 'input_types' and it is None
-            elif hasattr(value, "input_types") and value.input_types is None:
-                value.input_types = []
         return build_config