新增: 模板系统+工作流节点(YAML加载器+GitNode/HTTPNode/NotifyNode)

- template_loader.rs: YAML→DagDef加载器+校验(空节点/未知类型/依赖环/边引用)

- GitNode: 分支/checkout/commit/merge/push/status/log(git CLI封装)

- HTTPNode: GET/POST/PUT/DELETE(reqwest,30s超时)

- NotifyNode: 桌面通知(日志)+ Webhook(飞书/钉钉/自定义)

- 8个模板加载器测试+37个节点测试全绿

crates/df-nodes/src/http_node.rs

@@ -0,0 +1,319 @@
+//! HTTP 节点 — 发起 HTTP 请求(GET/POST/PUT/DELETE)
+//!
+//! 使用 reqwest(与 df-ai 同一版本 0.12)。config 提供 method/url/headers/body/timeout_secs。
+//! 输出 status_code + body + (可选)响应头子集。
+
+use std::time::Duration;
+
+use async_trait::async_trait;
+use df_workflow::node::{Node, NodeContext, NodeOutput, NodeResult, NodeSchema};
+
+/// HTTP 节点
+pub struct HttpNode;
+
+/// 支持的 HTTP 方法
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum HttpMethod {
+    Get,
+    Post,
+    Put,
+    Delete,
+}
+
+impl HttpMethod {
+    /// 从 config.method 字符串解析,大小写不敏感,非法值返回 Err。缺省返回 GET。
+    pub fn parse(raw: Option<&str>) -> anyhow::Result<Self> {
+        match raw.map(|s| s.to_ascii_uppercase()).as_deref() {
+            None | Some("GET") => Ok(HttpMethod::Get),
+            Some("POST") => Ok(HttpMethod::Post),
+            Some("PUT") => Ok(HttpMethod::Put),
+            Some("DELETE") => Ok(HttpMethod::Delete),
+            Some(other) => anyhow::bail!(
+                "HttpNode 非法 method: {}（合法值: GET|POST|PUT|DELETE）",
+                other
+            ),
+        }
+    }
+
+    fn as_str(&self) -> &'static str {
+        match self {
+            HttpMethod::Get => "GET",
+            HttpMethod::Post => "POST",
+            HttpMethod::Put => "PUT",
+            HttpMethod::Delete => "DELETE",
+        }
+    }
+}
+
+/// 从 NodeContext.config 解析出的 HttpNode 参数。
+/// 抽离此结构便于单元测试 config 解析逻辑(无需发起真实网络请求)。
+#[derive(Debug, Clone)]
+pub struct HttpParams {
+    pub method: HttpMethod,
+    pub url: String,
+    /// 请求头(JSON 对象 → Vec<(name, value)>)
+    pub headers: Vec<(String, String)>,
+    /// 请求体(可选)
+    pub body: Option<String>,
+    /// 超时秒数(缺省 30)
+    pub timeout_secs: u64,
+}
+
+/// 默认超时
+const DEFAULT_TIMEOUT_SECS: u64 = 30;
+
+/// 从 config JSON 解析 HttpParams。url 必填;method 缺省 GET;timeout 缺省 30。
+pub fn parse_params(config: &serde_json::Value) -> anyhow::Result<HttpParams> {
+    let method = HttpMethod::parse(config.get("method").and_then(|v| v.as_str()))?;
+
+    let url = config
+        .get("url")
+        .and_then(|v| v.as_str())
+        .ok_or_else(|| anyhow::anyhow!("HttpNode 缺少必填参数: url"))?;
+    if url.trim().is_empty() {
+        anyhow::bail!("HttpNode url 不能为空");
+    }
+
+    // headers:JSON 对象 → 有序 (name, value) 列表。非对象/非字符串值忽略并 warn。
+    let mut headers = Vec::new();
+    if let Some(obj) = config.get("headers").and_then(|v| v.as_object()) {
+        for (k, v) in obj {
+            match v.as_str() {
+                Some(s) => headers.push((k.clone(), s.to_string())),
+                None => {
+                    tracing::warn!(
+                        header = %k,
+                        "HttpNode headers 中 header 值非字符串,忽略"
+                    );
+                }
+            }
+        }
+    }
+
+    let body = config
+        .get("body")
+        .and_then(|v| v.as_str())
+        .map(|s| s.to_string());
+
+    let timeout_secs = config
+        .get("timeout_secs")
+        .and_then(|v| v.as_u64())
+        .unwrap_or(DEFAULT_TIMEOUT_SECS);
+
+    Ok(HttpParams {
+        method,
+        url: url.to_string(),
+        headers,
+        body,
+        timeout_secs,
+    })
+}
+
+#[async_trait]
+impl Node for HttpNode {
+    async fn execute(&self, ctx: NodeContext) -> NodeResult {
+        tracing::info!("HttpNode 执行: node_id={}", ctx.node_id);
+
+        let params = parse_params(&ctx.config)?;
+
+        tracing::info!(
+            method = params.method.as_str(),
+            url = %params.url,
+            timeout_secs = params.timeout_secs,
+            "HttpNode 发起请求"
+        );
+
+        let client = reqwest::Client::builder()
+            .timeout(Duration::from_secs(params.timeout_secs))
+            .build()?;
+
+        let mut req = match params.method {
+            HttpMethod::Get => client.get(&params.url),
+            HttpMethod::Post => client.post(&params.url),
+            HttpMethod::Put => client.put(&params.url),
+            HttpMethod::Delete => client.delete(&params.url),
+        };
+
+        for (name, value) in &params.headers {
+            req = req.header(name, value);
+        }
+
+        if let Some(body) = &params.body {
+            req = req.body(body.clone());
+        }
+
+        let response = req.send().await?;
+        let status_code = response.status().as_u16();
+
+        let content_type = response
+            .headers()
+            .get(reqwest::header::CONTENT_TYPE)
+            .and_then(|v| v.to_str().ok())
+            .map(|s| s.to_string());
+
+        let body_text = response.text().await?;
+
+        tracing::info!(
+            method = params.method.as_str(),
+            url = %params.url,
+            status_code,
+            body_len = body_text.len(),
+            "HttpNode 完成"
+        );
+
+        Ok(NodeOutput::from_value(serde_json::json!({
+            "method": params.method.as_str(),
+            "url": params.url,
+            "status_code": status_code,
+            "body": body_text,
+            "content_type": content_type,
+        })))
+    }
+
+    fn schema(&self) -> NodeSchema {
+        NodeSchema {
+            params: serde_json::json!({
+                "type": "object",
+                "properties": {
+                    "method": {
+                        "type": "string",
+                        "enum": ["GET", "POST", "PUT", "DELETE"],
+                        "default": "GET"
+                    },
+                    "url": { "type": "string", "description": "请求 URL" },
+                    "headers": {
+                        "type": "object",
+                        "description": "请求头 JSON 对象",
+                        "additionalProperties": { "type": "string" }
+                    },
+                    "body": { "type": "string", "description": "请求体(可选)" },
+                    "timeout_secs": { "type": "integer", "default": 30 }
+                },
+                "required": ["url"]
+            }),
+            output: serde_json::json!({
+                "type": "object",
+                "properties": {
+                    "method": { "type": "string" },
+                    "url": { "type": "string" },
+                    "status_code": { "type": "integer" },
+                    "body": { "type": "string" },
+                    "content_type": { "type": "string" }
+                }
+            }),
+        }
+    }
+
+    fn node_type(&self) -> &str {
+        "http"
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use serde_json::json;
+
+    // ── HttpMethod::parse ──
+
+    #[test]
+    fn method_defaults_to_get_when_absent() {
+        assert_eq!(HttpMethod::parse(None).unwrap(), HttpMethod::Get);
+    }
+
+    #[test]
+    fn method_case_insensitive() {
+        assert_eq!(HttpMethod::parse(Some("get")).unwrap(), HttpMethod::Get);
+        assert_eq!(HttpMethod::parse(Some("Post")).unwrap(), HttpMethod::Post);
+        assert_eq!(HttpMethod::parse(Some("DELETE")).unwrap(), HttpMethod::Delete);
+        assert_eq!(HttpMethod::parse(Some("pUt")).unwrap(), HttpMethod::Put);
+    }
+
+    #[test]
+    fn method_invalid_errors() {
+        let err = HttpMethod::parse(Some("PATCH")).unwrap_err().to_string();
+        assert!(err.contains("非法 method"), "实际: {}", err);
+        assert!(err.contains("PATCH"));
+    }
+
+    // ── parse_params(config) ──
+
+    #[test]
+    fn params_missing_url_errors() {
+        let err = parse_params(&json!({ "method": "GET" }))
+            .unwrap_err()
+            .to_string();
+        assert!(err.contains("url"), "实际: {}", err);
+    }
+
+    #[test]
+    fn params_empty_url_errors() {
+        let err = parse_params(&json!({ "url": "  " })).unwrap_err().to_string();
+        assert!(err.contains("空"), "实际: {}", err);
+    }
+
+    #[test]
+    fn params_defaults_method_and_timeout() {
+        let p = parse_params(&json!({ "url": "https://example.com" })).unwrap();
+        assert_eq!(p.method, HttpMethod::Get);
+        assert_eq!(p.timeout_secs, DEFAULT_TIMEOUT_SECS);
+        assert!(p.headers.is_empty());
+        assert_eq!(p.body, None);
+    }
+
+    #[test]
+    fn params_custom_timeout() {
+        let p = parse_params(&json!({ "url": "https://x", "timeout_secs": 5 })).unwrap();
+        assert_eq!(p.timeout_secs, 5);
+    }
+
+    #[test]
+    fn params_parses_headers_object() {
+        let p = parse_params(&json!({
+            "url": "https://x",
+            "headers": {
+                "Authorization": "Bearer abc",
+                "X-Trace-Id": "123"
+            }
+        }))
+        .unwrap();
+        // headers 顺序由 serde_json BTreeMap 保证;只校验集合
+        let map: std::collections::HashMap<&str, &str> =
+            p.headers.iter().map(|(k, v)| (k.as_str(), v.as_str())).collect();
+        assert_eq!(map.get("Authorization"), Some(&"Bearer abc"));
+        assert_eq!(map.get("X-Trace-Id"), Some(&"123"));
+    }
+
+    #[test]
+    fn params_non_string_header_value_skipped() {
+        // 非字符串值不应炸,应被跳过
+        let p = parse_params(&json!({
+            "url": "https://x",
+            "headers": { "X-Num": 123, "X-Ok": "yes" }
+        }))
+        .unwrap();
+        let names: Vec<&str> = p.headers.iter().map(|(k, _)| k.as_str()).collect();
+        assert!(names.contains(&"X-Ok"));
+        assert!(!names.contains(&"X-Num"), "非字符串 header 应被跳过");
+    }
+
+    #[test]
+    fn params_parses_body() {
+        let p = parse_params(&json!({
+            "url": "https://x",
+            "method": "POST",
+            "body": "{\"k\":1}"
+        }))
+        .unwrap();
+        assert_eq!(p.method, HttpMethod::Post);
+        assert_eq!(p.body.as_deref(), Some("{\"k\":1}"));
+    }
+
+    #[test]
+    fn params_invalid_method_propagates() {
+        let err = parse_params(&json!({ "url": "https://x", "method": "TRACE" }))
+            .unwrap_err()
+            .to_string();
+        assert!(err.contains("非法 method"), "实际: {}", err);
+    }
+}