FEAT: NEW WORKFLOW ENGINE (#3160)

Co-authored-by: Joel <iamjoel007@gmail.com>
Co-authored-by: Yeuoly <admin@srmxy.cn>
Co-authored-by: JzoNg <jzongcode@gmail.com>
Co-authored-by: StyleZhang <jasonapring2015@outlook.com>
Co-authored-by: jyong <jyong@dify.ai>
Co-authored-by: nite-knite <nkCoding@gmail.com>
Co-authored-by: jyong <718720800@qq.com>

api/core/workflow/nodes/end/end_node.py

@@ -0,0 +1,46 @@
+from typing import cast
+
+from core.workflow.entities.base_node_data_entities import BaseNodeData
+from core.workflow.entities.node_entities import NodeRunResult, NodeType
+from core.workflow.entities.variable_pool import VariablePool
+from core.workflow.nodes.base_node import BaseNode
+from core.workflow.nodes.end.entities import EndNodeData
+from models.workflow import WorkflowNodeExecutionStatus
+
+
+class EndNode(BaseNode):
+    _node_data_cls = EndNodeData
+    node_type = NodeType.END
+
+    def _run(self, variable_pool: VariablePool) -> NodeRunResult:
+        """
+        Run node
+        :param variable_pool: variable pool
+        :return:
+        """
+        node_data = self.node_data
+        node_data = cast(self._node_data_cls, node_data)
+        output_variables = node_data.outputs
+
+        outputs = {}
+        for variable_selector in output_variables:
+            value = variable_pool.get_variable_value(
+                variable_selector=variable_selector.value_selector
+            )
+
+            outputs[variable_selector.variable] = value
+
+        return NodeRunResult(
+            status=WorkflowNodeExecutionStatus.SUCCEEDED,
+            inputs=outputs,
+            outputs=outputs
+        )
+
+    @classmethod
+    def _extract_variable_selector_to_variable_mapping(cls, node_data: BaseNodeData) -> dict[str, list[str]]:
+        """
+        Extract variable selector to variable mapping
+        :param node_data: node data
+        :return:
+        """
+        return {}

api/core/workflow/nodes/end/entities.py

@@ -0,0 +1,9 @@
+from core.workflow.entities.base_node_data_entities import BaseNodeData
+from core.workflow.entities.variable_entities import VariableSelector
+
+
+class EndNodeData(BaseNodeData):
+    """
+    END Node Data.
+    """
+    outputs: list[VariableSelector]