refactor: move workflow package to dify_graph (#32844)

api/dify_graph/nodes/trigger_plugin/trigger_event_node.py

@@ -0,0 +1,64 @@
+from collections.abc import Mapping
+
+from dify_graph.constants import SYSTEM_VARIABLE_NODE_ID
+from dify_graph.entities.workflow_node_execution import WorkflowNodeExecutionMetadataKey, WorkflowNodeExecutionStatus
+from dify_graph.enums import NodeExecutionType, NodeType
+from dify_graph.node_events import NodeRunResult
+from dify_graph.nodes.base.node import Node
+
+from .entities import TriggerEventNodeData
+
+
+class TriggerEventNode(Node[TriggerEventNodeData]):
+    node_type = NodeType.TRIGGER_PLUGIN
+    execution_type = NodeExecutionType.ROOT
+
+    @classmethod
+    def get_default_config(cls, filters: Mapping[str, object] | None = None) -> Mapping[str, object]:
+        return {
+            "type": "plugin",
+            "config": {
+                "title": "",
+                "plugin_id": "",
+                "provider_id": "",
+                "event_name": "",
+                "subscription_id": "",
+                "plugin_unique_identifier": "",
+                "event_parameters": {},
+            },
+        }
+
+    @classmethod
+    def version(cls) -> str:
+        return "1"
+
+    def _run(self) -> NodeRunResult:
+        """
+        Run the plugin trigger node.
+
+        This node invokes the trigger to convert request data into events
+        and makes them available to downstream nodes.
+        """
+
+        # Get trigger data passed when workflow was triggered
+        metadata = {
+            WorkflowNodeExecutionMetadataKey.TRIGGER_INFO: {
+                "provider_id": self.node_data.provider_id,
+                "event_name": self.node_data.event_name,
+                "plugin_unique_identifier": self.node_data.plugin_unique_identifier,
+            },
+        }
+        node_inputs = dict(self.graph_runtime_state.variable_pool.user_inputs)
+        system_inputs = self.graph_runtime_state.variable_pool.system_variables.to_dict()
+
+        # TODO: System variables should be directly accessible, no need for special handling
+        # Set system variables as node outputs.
+        for var in system_inputs:
+            node_inputs[SYSTEM_VARIABLE_NODE_ID + "." + var] = system_inputs[var]
+        outputs = dict(node_inputs)
+        return NodeRunResult(
+            status=WorkflowNodeExecutionStatus.SUCCEEDED,
+            inputs=node_inputs,
+            outputs=outputs,
+            metadata=metadata,
+        )