refactor: move workflow package to dify_graph (#32844)

api/dify_graph/node_events/node.py

@@ -0,0 +1,65 @@
+from collections.abc import Sequence
+from datetime import datetime
+
+from pydantic import Field
+
+from core.model_runtime.entities.llm_entities import LLMUsage
+from core.rag.entities.citation_metadata import RetrievalSourceMetadata
+from dify_graph.entities.pause_reason import PauseReason
+from dify_graph.file import File
+from dify_graph.node_events import NodeRunResult
+
+from .base import NodeEventBase
+
+
+class RunRetrieverResourceEvent(NodeEventBase):
+    retriever_resources: Sequence[RetrievalSourceMetadata] = Field(..., description="retriever resources")
+    context: str = Field(..., description="context")
+    context_files: list[File] | None = Field(default=None, description="context files")
+
+
+class ModelInvokeCompletedEvent(NodeEventBase):
+    text: str
+    usage: LLMUsage
+    finish_reason: str | None = None
+    reasoning_content: str | None = None
+    structured_output: dict | None = None
+
+
+class RunRetryEvent(NodeEventBase):
+    error: str = Field(..., description="error")
+    retry_index: int = Field(..., description="Retry attempt number")
+    start_at: datetime = Field(..., description="Retry start time")
+
+
+class StreamChunkEvent(NodeEventBase):
+    # Spec-compliant fields
+    selector: Sequence[str] = Field(
+        ..., description="selector identifying the output location (e.g., ['nodeA', 'text'])"
+    )
+    chunk: str = Field(..., description="the actual chunk content")
+    is_final: bool = Field(default=False, description="indicates if this is the last chunk")
+
+
+class StreamCompletedEvent(NodeEventBase):
+    node_run_result: NodeRunResult = Field(..., description="run result")
+
+
+class PauseRequestedEvent(NodeEventBase):
+    reason: PauseReason = Field(..., description="pause reason")
+
+
+class HumanInputFormFilledEvent(NodeEventBase):
+    """Event emitted when a human input form is submitted."""
+
+    node_title: str
+    rendered_content: str
+    action_id: str
+    action_text: str
+
+
+class HumanInputFormTimeoutEvent(NodeEventBase):
+    """Event emitted when a human input form times out."""
+
+    node_title: str
+    expiration_time: datetime