| 1234567891011121314151617181920212223242526272829 | from pydantic import BaseModel, Fieldfrom core.model_runtime.entities.llm_entities import LLMUsagefrom core.workflow.entities.node_entities import NodeRunResultclass RunCompletedEvent(BaseModel):    run_result: NodeRunResult = Field(..., description="run result")class RunStreamChunkEvent(BaseModel):    chunk_content: str = Field(..., description="chunk content")    from_variable_selector: list[str] = Field(..., description="from variable selector")class RunRetrieverResourceEvent(BaseModel):    retriever_resources: list[dict] = Field(..., description="retriever resources")    context: str = Field(..., description="context")class ModelInvokeCompletedEvent(BaseModel):    """    Model invoke completed    """    text: str    usage: LLMUsage    finish_reason: str | None = None
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