feat(workflow): add HTTP request node
- Introduce a new HttpRequestNode to enable external HTTP API calls in workflows - Support multiple HTTP methods (GET, POST, PUT, DELETE, PATCH, HEAD) - Support authentication strategies (None, Basic, Bearer, Custom header) - Support multiple request body types (JSON, form-data, x-www-form-urlencoded, raw) - Add configurable timeout, retry, and SSL verification - Provide flexible error handling strategies (none, default response, branch)
This commit is contained in:
mengyonghao
@@ -16,6 +16,7 @@ from langgraph.graph.state import CompiledStateGraph
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from app.core.workflow.expression_evaluator import evaluate_condition
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from app.core.workflow.nodes import WorkflowState, NodeFactory
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from app.core.workflow.nodes.enums import NodeType
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# from app.core.tools.registry import ToolRegistry
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# from app.core.tools.executor import ToolExecutor
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# from app.core.tools.langchain_adapter import LangchainAdapter
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@@ -69,7 +70,7 @@ class WorkflowExecutor:
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初始化的工作流状态
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"""
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user_message = input_data.get("message") or ""
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# 会话变量处理：从配置文件获取变量定义列表，转换为字典（name -> default value）
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config_variables_list = self.workflow_config.get("variables") or []
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conversation_vars = {}
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@@ -78,19 +79,20 @@ class WorkflowExecutor:
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var_name = var_def.get("name")
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var_default = var_def.get("default")
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if var_name:
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# TODO: 入参类型校验
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conversation_vars[var_name] = var_default
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input_variables = input_data.get("variables") or {} # Start 节点的自定义变量
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# 构建分层的变量结构
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variables = {
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"sys": {
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"message": user_message, # 用户消息
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"message": user_message, # 用户消息
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"conversation_id": input_data.get("conversation_id"), # 会话 ID
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"execution_id": self.execution_id, # 执行 ID
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"workspace_id": self.workspace_id, # 工作空间 ID
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"user_id": self.user_id, # 用户 ID
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"input_variables": input_variables, # 自定义输入变量（给 Start 节点使用）
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"execution_id": self.execution_id, # 执行 ID
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"workspace_id": self.workspace_id, # 工作空间 ID
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"user_id": self.user_id, # 用户 ID
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"input_variables": input_variables, # 自定义输入变量（给 Start 节点使用）
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},
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"conv": conversation_vars # 会话级变量（跨多轮对话保持）
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}
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@@ -108,8 +110,6 @@ class WorkflowExecutor:
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"streaming_buffer": {} # 流式缓冲区
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}
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def _analyze_end_node_prefixes(self) -> tuple[dict[str, str], set[str]]:
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"""分析 End 节点的前缀配置
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@@ -120,72 +120,72 @@ class WorkflowExecutor:
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元组：({上游节点ID: End节点前缀}, {与End相邻且被引用的节点ID集合})
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"""
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import re
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prefixes = {}
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adjacent_and_referenced = set() # 记录与 End 节点相邻且被引用的节点
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# 找到所有 End 节点
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end_nodes = [node for node in self.nodes if node.get("type") == "end"]
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logger.info(f"[前缀分析] 找到 {len(end_nodes)} 个 End 节点")
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for end_node in end_nodes:
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end_node_id = end_node.get("id")
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output_template = end_node.get("config", {}).get("output")
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logger.info(f"[前缀分析] End 节点 {end_node_id} 模板: {output_template}")
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if not output_template:
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continue
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# 找到所有直接连接到 End 节点的上游节点
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direct_upstream_nodes = []
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for edge in self.edges:
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if edge.get("target") == end_node_id:
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source_node_id = edge.get("source")
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direct_upstream_nodes.append(source_node_id)
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logger.info(f"[前缀分析] End 节点的直接上游节点: {direct_upstream_nodes}")
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# 查找模板中引用了哪些节点
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# 匹配 {{node_id.xxx}} 或 {{ node_id.xxx }} 格式（支持空格）
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pattern = r'\{\{\s*([a-zA-Z0-9_]+)\.[a-zA-Z0-9_]+\s*\}\}'
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matches = list(re.finditer(pattern, output_template))
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logger.info(f"[前缀分析] 模板中找到 {len(matches)} 个节点引用")
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# 找到第一个直接上游节点的引用
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for match in matches:
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referenced_node_id = match.group(1)
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logger.info(f"[前缀分析] 检查引用: {referenced_node_id}")
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if referenced_node_id in direct_upstream_nodes:
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# 这是直接上游节点的引用，提取前缀
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prefix = output_template[:match.start()]
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logger.info(f"[前缀分析] ✅ 找到直接上游节点 {referenced_node_id} 的引用，前缀: '{prefix}'")
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# 标记这个节点为"相邻且被引用"
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adjacent_and_referenced.add(referenced_node_id)
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if prefix:
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prefixes[referenced_node_id] = prefix
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logger.info(f"✅ [前缀分析] 为节点 {referenced_node_id} 配置前缀: '{prefix[:50]}...'")
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# 只处理第一个直接上游节点的引用
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break
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logger.info(f"[前缀分析] 最终配置: {prefixes}")
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logger.info(f"[前缀分析] 与 End 相邻且被引用的节点: {adjacent_and_referenced}")
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return prefixes, adjacent_and_referenced
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def build_graph(self,stream=False) -> CompiledStateGraph:
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def build_graph(self, stream=False) -> CompiledStateGraph:
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"""构建 LangGraph
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Returns:
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编译后的状态图
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"""
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logger.info(f"开始构建工作流图: execution_id={self.execution_id}")
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# 分析 End 节点的前缀配置和相邻且被引用的节点
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end_prefixes, adjacent_and_referenced = self._analyze_end_node_prefixes() if stream else ({}, set())
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@@ -209,7 +209,7 @@ class WorkflowExecutor:
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# 创建节点实例（现在 start 和 end 也会被创建）
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node_instance = NodeFactory.create_node(node, self.workflow_config)
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if node_type in [NodeType.IF_ELSE]:
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if node_type in [NodeType.IF_ELSE, NodeType.HTTP_REQUEST]:
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expressions = node_instance.build_conditional_edge_expressions()
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# Number of branches, usually matches the number of conditional expressions
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@@ -232,13 +232,13 @@ class WorkflowExecutor:
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# 将 End 前缀配置注入到节点实例
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node_instance._end_node_prefix = end_prefixes[node_id]
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logger.info(f"为节点 {node_id} 注入 End 前缀配置")
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# 如果是流式模式，标记节点是否与 End 相邻且被引用
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if stream:
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node_instance._is_adjacent_to_end = node_id in adjacent_and_referenced
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if node_id in adjacent_and_referenced:
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logger.info(f"节点 {node_id} 标记为与 End 相邻且被引用")
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# 包装节点的 run 方法
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# 使用函数工厂避免闭包问题
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if stream:
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@@ -249,14 +249,18 @@ class WorkflowExecutor:
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# logger.debug(f"流式执行节点: {inst.node_id}, 支持流式: {inst.supports_streaming()}")
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async for item in inst.run_stream(state):
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yield item
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return node_func
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workflow.add_node(node_id, make_stream_func(node_instance))
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else:
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# 非流式模式：创建 async function
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def make_func(inst):
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async def node_func(state: WorkflowState):
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return await inst.run(state)
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return node_func
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workflow.add_node(node_id, make_func(node_instance))
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logger.debug(f"添加节点: {node_id} (type={node_type}, stream={stream})")
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@@ -426,7 +430,7 @@ class WorkflowExecutor:
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# 记录开始时间
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start_time = datetime.datetime.now()
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# 发送 workflow_start 事件
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yield {
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"event": "workflow_start",
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@@ -447,7 +451,7 @@ class WorkflowExecutor:
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try:
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chunk_count = 0
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final_state = None
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async for event in graph.astream(
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initial_state,
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stream_mode=["updates", "debug", "custom"], # Use updates + debug + custom mode
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@@ -466,7 +470,7 @@ class WorkflowExecutor:
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chunk_count += 1
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event_type = data.get("type", "node_chunk") # "message" or "node_chunk"
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logger.info(f"[CUSTOM] ✅ 收到 {event_type} #{chunk_count} from {data.get('node_id')}")
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yield {
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"event": event_type, # "message" or "node_chunk"
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"data": {
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@@ -478,7 +482,7 @@ class WorkflowExecutor:
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"is_suffix": data.get("is_suffix")
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}
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}
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elif mode == "debug":
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# Handle debug information (node execution status)
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event_type = data.get("type")
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@@ -493,7 +497,7 @@ class WorkflowExecutor:
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conversation_id = variables_sys.get("conversation_id")
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execution_id = variables_sys.get("execution_id")
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logger.info(f"[DEBUG] Node starts execution: {node_name}")
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yield {
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"event": "node_start",
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"data": {
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@@ -512,7 +516,7 @@ class WorkflowExecutor:
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conversation_id = variables_sys.get("conversation_id")
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execution_id = variables_sys.get("execution_id")
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logger.info(f"[DEBUG] Node execution completed: {node_name}")
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yield {
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"event": "node_end",
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"data": {
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@@ -527,13 +531,16 @@ class WorkflowExecutor:
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# Handle state updates - store final state
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logger.debug(f"[UPDATES] 收到 state 更新 from {list(data.keys())}")
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final_state = data
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# 计算耗时
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end_time = datetime.datetime.now()
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elapsed_time = (end_time - start_time).total_seconds()
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logger.info(f"Workflow execution completed (streaming), total chunks: {chunk_count}, elapsed: {elapsed_time:.2f}s")
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logger.info(
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f"Workflow execution completed (streaming), "
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f"total chunks: {chunk_count}, elapsed: {elapsed_time:.2f}s"
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)
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# 发送 workflow_end 事件
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yield {
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"event": "workflow_end",
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@@ -551,7 +558,7 @@ class WorkflowExecutor:
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elapsed_time = (end_time - start_time).total_seconds()
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logger.error(f"工作流执行失败: execution_id={self.execution_id}, error={e}", exc_info=True)
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# 发送 workflow_end 事件（失败）
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yield {
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"event": "workflow_end",
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@@ -678,7 +685,6 @@ async def execute_workflow_stream(
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async for event in executor.execute_stream(input_data):
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yield event
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# ==================== 工具管理系统集成 ====================
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# def get_workflow_tools(workspace_id: str, user_id: str) -> list:
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@@ -852,4 +858,4 @@ async def execute_workflow_stream(
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# NodeFactory.register_node_type("tool", ToolWorkflowNode)
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# logger.info("工具节点已注册到工作流系统")
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# except Exception as e:
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# logger.warning(f"注册工具节点失败: {e}")
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# logger.warning(f"注册工具节点失败: {e}")
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@@ -11,6 +11,7 @@ from app.core.workflow.nodes.end import EndNode
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from app.core.workflow.nodes.if_else import IfElseNode
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from app.core.workflow.nodes.knowledge import KnowledgeRetrievalNode
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from app.core.workflow.nodes.llm import LLMNode
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from app.core.workflow.nodes.http_request import HttpRequestNode
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from app.core.workflow.nodes.node_factory import NodeFactory, WorkflowNode
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from app.core.workflow.nodes.start import StartNode
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from app.core.workflow.nodes.transform import TransformNode
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@@ -28,4 +29,5 @@ __all__ = [
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"WorkflowNode",
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"KnowledgeRetrievalNode",
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"AssignerNode",
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"HttpRequestNode"
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]
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@@ -15,6 +15,7 @@ from app.core.workflow.nodes.agent.config import AgentNodeConfig
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from app.core.workflow.nodes.transform.config import TransformNodeConfig
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from app.core.workflow.nodes.if_else.config import IfElseNodeConfig
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from app.core.workflow.nodes.knowledge.config import KnowledgeRetrievalNodeConfig
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from app.core.workflow.nodes.http_request.config import HttpRequestNodeConfig
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from app.core.workflow.nodes.assigner.config import AssignerNodeConfig
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__all__ = [
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@@ -32,4 +33,5 @@ __all__ = [
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"IfElseNodeConfig",
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"KnowledgeRetrievalNodeConfig",
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"AssignerNodeConfig",
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"HttpRequestNodeConfig"
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]
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@@ -73,3 +73,34 @@ class AssignmentOperator(StrEnum):
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return ObjectOperator
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raise TypeError(f"Unsupported variable type ({type(obj)})")
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class HttpRequestMethod(StrEnum):
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GET = "GET"
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POST = "POST"
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HEAD = "HEAD"
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PUT = "PUT"
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PATCH = "PATCH"
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DELETE = "DELETE"
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class HttpAuthType(StrEnum):
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NONE = "none"
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BASIC = "basic"
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BEARER = "bearer"
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CUSTOM = "custom"
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class HttpContentType(StrEnum):
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NONE = "none"
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FROM_DATA = "form-data"
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WWW_FORM = "x-www-form-urlencoded"
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JSON = "json"
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RAW = "raw"
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BINARY = "binary"
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class HttpErrorHandle(StrEnum):
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NONE = "none"
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DEFAULT = "default"
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BRANCH = "branch"
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4
api/app/core/workflow/nodes/http_request/__init__.py
Normal file
4
api/app/core/workflow/nodes/http_request/__init__.py
Normal file
@@ -0,0 +1,4 @@
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from app.core.workflow.nodes.http_request.config import HttpRequestNodeConfig
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from app.core.workflow.nodes.http_request.node import HttpRequestNode
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__all__ = ['HttpRequestNode', 'HttpRequestNodeConfig']
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215
api/app/core/workflow/nodes/http_request/config.py
Normal file
215
api/app/core/workflow/nodes/http_request/config.py
Normal file
@@ -0,0 +1,215 @@
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from typing import Literal
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from pydantic import Field, BaseModel, field_validator
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from app.core.workflow.nodes.base_config import BaseNodeConfig
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from app.core.workflow.nodes.enums import HttpRequestMethod, HttpAuthType, HttpContentType, HttpErrorHandle
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class HttpAuthConfig(BaseModel):
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auth_type: HttpAuthType = Field(
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default=HttpAuthType.NONE,
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description="Type of HTTP authentication to use",
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)
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header: str = Field(
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default="",
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description="Custom HTTP Authorization header (used if auth_type is CUSTOM)",
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)
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api_key: str = Field(
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default="",
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description="API key for authentication (used if auth_type is not NONE)",
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)
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@field_validator("header")
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@classmethod
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def validate_header(cls, v, info):
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auth_type = info.data.get("auth_type")
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if auth_type == HttpAuthType.CUSTOM and not v:
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raise ValueError("Custom auth header not specified")
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return v
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@field_validator("api_key")
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@classmethod
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def validate_api_key(cls, v, info):
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auth_type = info.data.get("auth_type")
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if auth_type != HttpAuthType.NONE and not v:
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raise ValueError("API key for authentication not specified")
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return v
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class HttpFormData(BaseModel):
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key: str = Field(
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...,
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description="Form-data field name",
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)
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type: Literal["text", "file"] = Field(
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...,
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description="Form-data type: 'text' or 'file'"
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)
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value: str = Field(
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...,
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description="Form-data field value",
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)
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class HttpContentTypeConfig(BaseModel):
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content_type: HttpContentType = Field(
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...,
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description="HTTP content type of the request body",
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)
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data: list[HttpFormData] | dict | str = Field(
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...,
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description="Data of the HTTP request body; type depends on content_type",
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)
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@field_validator("data")
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@classmethod
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def validate_data(cls, v, info):
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content_type = info.data.get("content_type")
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if content_type == HttpContentType.FROM_DATA and not isinstance(v, HttpFormData):
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raise ValueError("When content_type is 'form-data', data must be of type HttpFormData")
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elif content_type in [HttpContentType.JSON, HttpContentType.WWW_FORM] and not isinstance(v, dict):
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raise ValueError("When content_type is JSON or x-www-form-urlencoded, data must be a object")
|
||||
elif content_type in [HttpContentType.RAW, HttpContentType.BINARY] and not isinstance(v, str):
|
||||
raise ValueError("When content_type is raw/binary, data must be a string (File descriptor)")
|
||||
return v
|
||||
|
||||
|
||||
class HttpTimeOutConfig(BaseModel):
|
||||
connect_timeout: int = Field(
|
||||
default=5,
|
||||
description="Connection timeout in seconds",
|
||||
)
|
||||
|
||||
read_timeout: int = Field(
|
||||
default=5,
|
||||
description="Read timeout in seconds",
|
||||
)
|
||||
|
||||
write_timeout: int = Field(
|
||||
default=5,
|
||||
description="Write timeout in seconds",
|
||||
)
|
||||
|
||||
|
||||
class HttpRetryConfig(BaseModel):
|
||||
max_attempts: int = Field(
|
||||
default=1,
|
||||
description="Maximum number of retry attempts for failed requests",
|
||||
)
|
||||
retry_interval: int = Field(
|
||||
default=100,
|
||||
description="Interval between retries in milliseconds",
|
||||
)
|
||||
|
||||
|
||||
class HttpErrorDefaultTamplete(BaseModel):
|
||||
body: str = Field(
|
||||
default="",
|
||||
description="Default body returned on HTTP error",
|
||||
)
|
||||
|
||||
status_code: int = Field(
|
||||
default=400,
|
||||
description="Default HTTP status code returned on error",
|
||||
)
|
||||
|
||||
headers: dict = Field(
|
||||
default_factory=dict,
|
||||
description="Default HTTP headers returned on error",
|
||||
)
|
||||
|
||||
|
||||
class HttpErrorHandleConfig(BaseModel):
|
||||
method: HttpErrorHandle = Field(
|
||||
default=HttpErrorHandle.NONE,
|
||||
description="Error handling strategy: 'none', 'default', or 'branch'",
|
||||
)
|
||||
|
||||
default: HttpErrorDefaultTamplete = Field(
|
||||
...,
|
||||
description="Default response template for error handling",
|
||||
)
|
||||
|
||||
|
||||
class HttpRequestNodeConfig(BaseNodeConfig):
|
||||
method: HttpRequestMethod = Field(
|
||||
...,
|
||||
description="HTTP method for the request (GET, POST, etc.)",
|
||||
)
|
||||
|
||||
url: str = Field(
|
||||
...,
|
||||
description="URL of the HTTP request",
|
||||
)
|
||||
|
||||
auth: HttpAuthConfig = Field(
|
||||
...,
|
||||
description="HTTP authentication configuration",
|
||||
)
|
||||
|
||||
headers: dict = Field(
|
||||
default_factory=dict,
|
||||
description="HTTP request headers",
|
||||
)
|
||||
|
||||
params: dict = Field(
|
||||
default_factory=dict,
|
||||
description="Query parameters for the HTTP request",
|
||||
)
|
||||
|
||||
body: HttpContentTypeConfig = Field(
|
||||
...,
|
||||
description="HTTP request body configuration",
|
||||
)
|
||||
|
||||
verify_ssl: bool = Field(
|
||||
...,
|
||||
description="Whether to verify SSL certificates",
|
||||
)
|
||||
|
||||
timeouts: HttpTimeOutConfig = Field(
|
||||
...,
|
||||
description="Timeout settings for the request",
|
||||
)
|
||||
|
||||
retry: HttpRetryConfig = Field(
|
||||
...,
|
||||
description="Retry configuration for failed requests",
|
||||
)
|
||||
|
||||
error_handle: HttpErrorHandleConfig = Field(
|
||||
...,
|
||||
description="Configuration for handling HTTP request errors",
|
||||
)
|
||||
|
||||
|
||||
class HttpRequestNodeOutput(BaseModel):
|
||||
body: str = Field(
|
||||
...,
|
||||
description="Body of the HTTP response",
|
||||
)
|
||||
|
||||
status_code: int = Field(
|
||||
...,
|
||||
description="HTTP response status code",
|
||||
)
|
||||
|
||||
headers: dict = Field(
|
||||
...,
|
||||
description="Http response headers"
|
||||
)
|
||||
|
||||
output: str = Field(
|
||||
default="SUCCESS",
|
||||
description="HTTP response body",
|
||||
)
|
||||
|
||||
# files: list[File] = Field(
|
||||
# ...
|
||||
# )
|
||||
238
api/app/core/workflow/nodes/http_request/node.py
Normal file
238
api/app/core/workflow/nodes/http_request/node.py
Normal file
@@ -0,0 +1,238 @@
|
||||
import asyncio
|
||||
import json
|
||||
import logging
|
||||
from typing import Any, Callable, Coroutine
|
||||
|
||||
import httpx
|
||||
# import filetypes # TODO: File support (Feature)
|
||||
from httpx import AsyncClient, Response, Timeout
|
||||
|
||||
from app.core.workflow.nodes import BaseNode, WorkflowState
|
||||
from app.core.workflow.nodes.enums import HttpRequestMethod, HttpErrorHandle, HttpAuthType, HttpContentType
|
||||
from app.core.workflow.nodes.http_request.config import HttpRequestNodeConfig, HttpRequestNodeOutput
|
||||
|
||||
logger = logging.getLogger(__file__)
|
||||
|
||||
|
||||
class HttpRequestNode(BaseNode):
|
||||
"""
|
||||
HTTP Request Workflow Node.
|
||||
|
||||
This node executes an HTTP request as part of a workflow execution.
|
||||
It supports:
|
||||
- Multiple HTTP methods (GET, POST, PUT, DELETE, PATCH, HEAD)
|
||||
- Multiple authentication strategies
|
||||
- Multiple request body content types
|
||||
- Retry mechanism with configurable interval
|
||||
- Flexible error handling strategies
|
||||
|
||||
The execution result is returned as a serialized HttpRequestNodeOutput,
|
||||
or a branch identifier string when error branching is enabled.
|
||||
"""
|
||||
|
||||
def __init__(self, node_config: dict[str, Any], workflow_config: dict[str, Any]):
|
||||
super().__init__(node_config, workflow_config)
|
||||
self.typed_config = HttpRequestNodeConfig(**self.config)
|
||||
|
||||
def _build_timeout(self) -> Timeout:
|
||||
"""
|
||||
Build httpx Timeout configuration.
|
||||
|
||||
All four timeout dimensions are explicitly defined to avoid
|
||||
implicit defaults that may lead to unpredictable behavior
|
||||
in production environments.
|
||||
"""
|
||||
timeout = httpx.Timeout(
|
||||
connect=self.typed_config.timeouts.connect_timeout,
|
||||
read=self.typed_config.timeouts.read_timeout,
|
||||
write=self.typed_config.timeouts.write_timeout,
|
||||
pool=5
|
||||
)
|
||||
return timeout
|
||||
|
||||
def _build_auth(self, state: WorkflowState) -> dict[str, str]:
|
||||
"""
|
||||
Build authentication-related HTTP headers.
|
||||
|
||||
Authentication values support template rendering based on
|
||||
the current workflow runtime state.
|
||||
|
||||
Args:
|
||||
state: Current workflow runtime state.
|
||||
|
||||
Returns:
|
||||
A dictionary of HTTP headers used for authentication.
|
||||
"""
|
||||
api_key = self._render_template(self.typed_config.auth.api_key, state)
|
||||
match self.typed_config.auth.auth_type:
|
||||
case HttpAuthType.NONE:
|
||||
return {}
|
||||
case HttpAuthType.BASIC:
|
||||
return {
|
||||
"Authorization": f"Basic {api_key}",
|
||||
}
|
||||
case HttpAuthType.BEARER:
|
||||
return {
|
||||
"Authorization": f"Bearer {api_key}",
|
||||
}
|
||||
case HttpAuthType.CUSTOM:
|
||||
return {
|
||||
self.typed_config.auth.header: api_key
|
||||
}
|
||||
case _:
|
||||
raise RuntimeError(f"Auth type not supported: {self.typed_config.auth_type}")
|
||||
|
||||
def _build_header(self, state: WorkflowState) -> dict[str, str]:
|
||||
"""
|
||||
Build HTTP request headers.
|
||||
|
||||
Both header keys and values support runtime template rendering.
|
||||
"""
|
||||
headers = {}
|
||||
for key, value in self.typed_config.headers.items():
|
||||
headers[self._render_template(key, state)] = self._render_template(value, state)
|
||||
return headers
|
||||
|
||||
def _build_params(self, state: WorkflowState) -> dict[str, str]:
|
||||
"""
|
||||
Build URL query parameters.
|
||||
|
||||
Parameter keys and values support runtime template rendering.
|
||||
"""
|
||||
params = {}
|
||||
for key, value in self.typed_config.params.items():
|
||||
params[self._render_template(key, state)] = self._render_template(value, state)
|
||||
return params
|
||||
|
||||
def _build_content(self, state) -> dict[str, Any]:
|
||||
"""
|
||||
Build HTTP request body arguments for httpx request methods.
|
||||
|
||||
The returned dictionary is directly unpacked into the httpx
|
||||
request call (e.g., json=, data=, content=).
|
||||
|
||||
Returns:
|
||||
A dictionary containing httpx-compatible request body arguments.
|
||||
"""
|
||||
content = {}
|
||||
match self.typed_config.body.content_type:
|
||||
case HttpContentType.NONE:
|
||||
return {}
|
||||
case HttpContentType.JSON:
|
||||
content["json"] = json.loads(self._render_template(
|
||||
json.dumps(self.typed_config.body.data), state
|
||||
))
|
||||
case HttpContentType.FROM_DATA:
|
||||
data = {}
|
||||
for item in self.typed_config.body.data:
|
||||
if item.type == "text":
|
||||
data[self._render_template(item.key, state)] = self._render_template(item.value, state)
|
||||
elif item.type == "file":
|
||||
# TODO: File support (Feature)
|
||||
pass
|
||||
content["data"] = data
|
||||
case HttpContentType.BINARY:
|
||||
# TODO: File support (Feature)
|
||||
pass
|
||||
case HttpContentType.WWW_FORM:
|
||||
content["data"] = json.loads(self._render_template(
|
||||
json.dumps(self.typed_config.body.data), state
|
||||
))
|
||||
|
||||
case HttpContentType.RAW:
|
||||
content["content"] = self._render_template(self.typed_config.body.data, state)
|
||||
case _:
|
||||
raise RuntimeError(f"Content type not supported: {self.typed_config.content_type}")
|
||||
return content
|
||||
|
||||
def _get_client_method(self, client: AsyncClient) -> Callable[..., Coroutine[Any, Any, Response]]:
|
||||
"""
|
||||
Resolve the httpx AsyncClient method based on configured HTTP method.
|
||||
"""
|
||||
match self.typed_config.method:
|
||||
case HttpRequestMethod.GET:
|
||||
return client.get
|
||||
case HttpRequestMethod.POST:
|
||||
return client.post
|
||||
case HttpRequestMethod.PUT:
|
||||
return client.put
|
||||
case HttpRequestMethod.DELETE:
|
||||
return client.delete
|
||||
case HttpRequestMethod.PATCH:
|
||||
return client.patch
|
||||
case HttpRequestMethod.HEAD:
|
||||
return client.head
|
||||
case _:
|
||||
raise RuntimeError(f"HttpRequest method not supported: {self.typed_config.method}")
|
||||
|
||||
def build_conditional_edge_expressions(self):
|
||||
"""
|
||||
Build conditional edge expressions for workflow branching.
|
||||
|
||||
When the HTTP error handling strategy is set to `BRANCH`,
|
||||
this node exposes a single conditional output labeled "ERROR".
|
||||
The workflow engine uses this output to create an explicit
|
||||
error-handling branch for downstream nodes.
|
||||
|
||||
Returns:
|
||||
list[str]:
|
||||
- ["ERROR"] if error handling strategy is BRANCH
|
||||
- An empty list if no conditional branching is required
|
||||
"""
|
||||
if self.typed_config.error_handle.method == HttpErrorHandle.BRANCH:
|
||||
return ["ERROR"]
|
||||
return []
|
||||
|
||||
async def execute(self, state: WorkflowState) -> dict | str:
|
||||
"""
|
||||
Execute the HTTP request node.
|
||||
|
||||
Execution flow:
|
||||
1. Initialize AsyncClient with configured options
|
||||
2. Perform HTTP request with retry mechanism
|
||||
3. Apply configured error handling strategy on failure
|
||||
|
||||
Args:
|
||||
state: Current workflow runtime state.
|
||||
|
||||
Returns:
|
||||
- dict: Serialized HttpRequestNodeOutput on success
|
||||
- str: Branch identifier (e.g. "ERROR") when branching is enabled
|
||||
"""
|
||||
async with httpx.AsyncClient(
|
||||
verify=self.typed_config.verify_ssl,
|
||||
timeout=self._build_timeout(),
|
||||
headers=self._build_header(state) | self._build_auth(state),
|
||||
params=self._build_params(state),
|
||||
) as client:
|
||||
retries = self.typed_config.retry.max_attempts
|
||||
while retries > 0:
|
||||
try:
|
||||
request_func = self._get_client_method(client)
|
||||
resp = await request_func(
|
||||
url=self._render_template(self.typed_config.url, state),
|
||||
**self._build_content(state)
|
||||
)
|
||||
resp.raise_for_status()
|
||||
return HttpRequestNodeOutput(
|
||||
body=resp.text,
|
||||
status_code=resp.status_code,
|
||||
headers=resp.headers,
|
||||
).model_dump()
|
||||
except (httpx.HTTPStatusError, httpx.RequestError) as e:
|
||||
logger.error(f"HTTP request node exception: {e}")
|
||||
retries -= 1
|
||||
if retries > 0:
|
||||
await asyncio.sleep(self.typed_config.retry.retry_interval / 1000)
|
||||
else:
|
||||
match self.typed_config.error_handle.method:
|
||||
case HttpErrorHandle.NONE:
|
||||
return HttpRequestNodeOutput(
|
||||
body="",
|
||||
status_code=resp.status_code,
|
||||
headers=resp.headers,
|
||||
).model_dump()
|
||||
case HttpErrorHandle.DEFAULT:
|
||||
return self.typed_config.error_handle.default.model_dump()
|
||||
case HttpErrorHandle.BRANCH:
|
||||
return "ERROR"
|
||||
@@ -8,6 +8,7 @@ import logging
|
||||
from typing import Any, Union
|
||||
|
||||
from app.core.workflow.nodes.knowledge import KnowledgeRetrievalNode
|
||||
from app.core.workflow.nodes.http_request import HttpRequestNode
|
||||
from app.core.workflow.nodes.agent import AgentNode
|
||||
from app.core.workflow.nodes.base_node import BaseNode
|
||||
from app.core.workflow.nodes.end import EndNode
|
||||
@@ -29,6 +30,7 @@ WorkflowNode = Union[
|
||||
AgentNode,
|
||||
TransformNode,
|
||||
AssignerNode,
|
||||
HttpRequestNode,
|
||||
KnowledgeRetrievalNode,
|
||||
]
|
||||
|
||||
@@ -49,6 +51,7 @@ class NodeFactory:
|
||||
NodeType.IF_ELSE: IfElseNode,
|
||||
NodeType.KNOWLEDGE_RETRIEVAL: KnowledgeRetrievalNode,
|
||||
NodeType.ASSIGNER: AssignerNode,
|
||||
NodeType.HTTP_REQUEST: HttpRequestNode,
|
||||
}
|
||||
|
||||
@classmethod
|
||||
|
||||
Reference in New Issue
Block a user