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chapter05/04_output_tasks_debug.py

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+from typing import TypedDict
+from loguru import logger
+import time
+from langgraph.types import interrupt, Command
+
+
+# https://xbsheng.github.io/atguigu-note/langgraph/%E8%AF%BE%E4%BB%B6/05-LangGraph%E9%AB%98%E7%BA%A7%E7%89%B9%E6%80%A7
+
+
+class OverallState(TypedDict):
+    initial_input: str
+    node_a1: str
+    node_a2: str
+    node_b: str
+
+
+def node_a1(state: OverallState) -> OverallState:
+    time.sleep(1)
+    logger.info("node_a1")
+    return OverallState(node_a1="node_a1")
+
+
+def node_a2(state: OverallState) -> OverallState:
+    time.sleep(3)
+    logger.info("node_a2")
+
+    return OverallState(node_a2="node_a2")
+
+
+def node_b(state: OverallState) -> OverallState:
+    time.sleep(1)
+    res = interrupt("hello")
+    logger.info("node_b")
+    return OverallState(node_b=f"node_b,res={res}")
+
+
+from langgraph.graph import StateGraph, START, END
+from langgraph.checkpoint.memory import InMemorySaver
+
+builder = StateGraph(state_schema=OverallState)
+builder.add_node("node_a1", node_a1)
+builder.add_node("node_a2", node_a2)
+builder.add_node("node_b", node_b)
+
+builder.add_edge(START, "node_a1")
+builder.add_edge(START, "node_a2")
+builder.add_edge(["node_a1", "node_a2"], "node_b")
+builder.add_edge("node_b", END)
+
+checkpoint_saver = InMemorySaver()
+
+graph = builder.compile(checkpointer=checkpoint_saver)
+
+from IPython.display import display
+
+display(graph)
+
+from rich import print as rp
+
+config = {
+    "configurable": {
+        "thread_id": "12345"
+    }
+}
+
+for chunk in graph.stream(
+        {"initial_input": "init"},
+        stream_mode=["debug"],
+        config=config
+):
+    print("=" * 50)
+    rp(chunk)
+
+# print("=" * 50)
+# rp(list(graph.get_state_history(config=config)))
+print("**" * 50)
+
+for chunk in graph.stream(
+        Command(resume="interrupt_node_b_res"),
+        stream_mode=["debug"],
+        config=config
+):
+    print("=" * 50)
+    rp(chunk)
+# print("=" * 50)
+# rp(list(graph.get_state_history(config=config)))