feat: add pingora-demo

__network/pingora-demo/Cargo.toml

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+[package]
+name = "pingora-demo"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+pingora-core = "0.2"
+pingora-proxy = "0.2"
+tokio = { version = "1.0", features = ["full"] }
+async-trait = "0.1"
+mime_guess = "2.0"
+headers = "0.3"
+
+

__network/pingora-demo/README.md

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+
+
+> Copied from: https://mp.weixin.qq.com/s/RHSy2EeK3XTRYXtOSCO0Ug
+> https://play.hatter.me/doc/showDocDetail.jssp?id=8495
+
+

__network/pingora-demo/src/main.rs

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+use async_trait::async_trait;
+use headers::{ContentLength, ContentType};
+use pingora_core::server::Server;
+use pingora_proxy::{ProxyHttp, Session};
+use std::path::{Path, PathBuf};
+use std::sync::Arc;
+use mime_guess::from_path;
+
+struct StaticFileServer {
+    root_dir: PathBuf,
+}
+
+impl StaticFileServer {
+    fn new(root: impl AsRef<Path>) -> Self {
+        StaticFileServer {
+            root_dir: root.as_ref().to_path_buf(),
+        }
+    }
+}
+
+#[async_trait]
+impl ProxyHttp for StaticFileServer {
+    async fn response_filter(&self, session: &mut Session, response: &mut pingora_http::Response) {
+        let path = session.req_header().uri.path();
+        let file_path = self.root_dir.join(&path[1..]); // 去除前导/
+
+        if let Ok(metadata) = tokio::fs::metadata(&file_path).await {
+            if metadata.is_file() {
+                if let Ok(file) = tokio::fs::read(&file_path).await {
+                    // 设置正确的Content-Type
+                    let mime = from_path(&file_path).first_or_octet_stream();
+                    response.headers_mut().insert(
+                        headers::CONTENT_TYPE,
+                        ContentType::from(mime).to_string().parse().unwrap(),
+                    );
+
+                    // 设置Content-Length
+                    response.headers_mut().insert(
+                        headers::CONTENT_LENGTH,
+                        ContentLength(metadata.len()).to_string().parse().unwrap(),
+                    );
+
+                    // 设置缓存头（CDN关键配置）
+                    response.headers_mut().insert(
+                        "cache-control",
+                        "public, max-age=31536000".parse().unwrap(), // 1年缓存
+                    );
+
+                    *response.body_mut() = file.into();
+                    response.set_status(200);
+                    return;
+                }
+            }
+        }
+
+        // 文件不存在
+        *response.status_mut() = 404;
+        *response.body_mut() = b"Not Found".to_vec().into();
+    }
+}
+
+#[tokio::main]
+async fn main() {
+    // 1. 初始化服务器
+    let mut server = Server::new(Some("Static File Server")).unwrap();
+    server.bootstrap();
+
+    // 2. 创建文件服务（假设静态文件在./static目录）
+    let static_service = StaticFileServer::new("./static");
+    let mut service = pingora_proxy::http_proxy_service(&server.configuration, static_service);
+
+    // 3. 监听端口
+    service.add_tcp("0.0.0.0:8080");
+
+    // 4. 启动服务
+    server.add_service(service);
+    println!("Static file server running on :8080");
+    server.run_forever();
+}
+