36. 干货系列从零用Rust编写负载均衡及代理，内网穿透中内网代理的实现 - ToB企服应用市场:ToB评测及商务社交产业平台

#[serde_as]
#[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
pub struct MappingConfig {
/// 其它字段....
// 添加模块proxy
pub mode: String,
}

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#[serde_as]
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ProxyConfig {
/// 其它字段....
pub(crate) map_http_bind: Option<SocketAddr>,
pub(crate) map_https_bind: Option<SocketAddr>,
pub(crate) map_tcp_bind: Option<SocketAddr>,
// 新加代理接口监听字段
pub(crate) map_proxy_bind: Option<SocketAddr>,
-
}

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pub async fn server_new_prxoy(&mut self, stream: TcpStream) -> ProxyResult<()> {
let trans = TransTcp::new(
self.sender(),
self.sender_work(),
self.calc_next_id(),
self.mappings.clone(),
);
tokio::spawn(async move {
if let Err(e) = trans.process(stream, "proxy").await {
log::warn!("内网穿透:转发Proxy转发时发生错误:{:?}", e);
}
});
return Ok(());
}

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let (virtual_sender, virtual_receiver) = channel::<ProtFrame>(10);
map.insert(p.sock_map(), virtual_sender);
if mapping.as_ref().unwrap().is_proxy() {
let stream = VirtualStream::new(
p.sock_map(),
sender.clone(),
virtual_receiver,
);
let (flag, username, password, udp_bind) = (
option.flag,
option.username.clone(),
option.password.clone(),
option.udp_bind.clone(),
);
tokio::spawn(async move {
// 处理代理的能力
let _ = WMCore::deal_proxy(
stream, flag, username, password, udp_bind,
)
.await;
});
}

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pub struct VirtualStream
{
// sock绑定的句柄
id: u32,
// 收到数据通过sender发送给中心端
sender: PollSender<ProtFrame>,
// 收到中心端的写入请求，转成write
receiver: Receiver<ProtFrame>,
// 读取的数据缓存，将转发成ProtFrame
read: BinaryMut,
// 写的数据缓存，直接写入到stream下，从ProtFrame转化而来
write: BinaryMut,
}

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/// 代理服务器类, 提供代理服务
pub struct ProxyServer {
flag: Flag,
username: Option<String>,
password: Option<String>,
udp_bind: Option<IpAddr>,
headers: Vec<ConfigHeader>,
}

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impl Operate {
fn deal_request(&self, req: &mut RecvRequest) -> ProtResult<()> {
if let Some(headers) = &self.headers {
// 复写Request的头文件信息
Helper::rewrite_request(req, headers);
}
Ok(())
}
fn deal_response(&self, res: &mut RecvResponse) -> ProtResult<()> {
if let Some(headers) = &self.headers {
// 复写Request的头文件信息
Helper::rewrite_response(res, headers);
}
Ok(())
}
}

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#[tokio::test]
async fn run_test() {
let local_server_addr = run_server().await.unwrap();
let addr = "127.0.0.1:0".parse().unwrap();
let proxy = ProxyConfig::builder()
.bind_addr(addr)
.map_http_bind(Some(addr))
.map_https_bind(Some(addr))
.map_tcp_bind(Some(addr))
.map_proxy_bind(Some(addr))
.center(true)
.mode("server".to_string())
.into_value()
.unwrap();
let (server_addr, http_addr, https_addr, tcp_addr, proxy_addr, _sender) =
run_mapping_server(proxy).await.unwrap();
let mut mapping = MappingConfig::new(
"test".to_string(),
"http".to_string(),
"soft.wm-proxy.com".to_string(),
vec![],
);
mapping.local_addr = Some(local_server_addr);
let mut mapping_tcp = MappingConfig::new(
"tcp".to_string(),
"tcp".to_string(),
"soft.wm-proxy.com".to_string(),
vec![],
);
mapping_tcp.local_addr = Some(local_server_addr);
let mut mapping_proxy = MappingConfig::new(
"proxy".to_string(),
"proxy".to_string(),
"soft.wm-proxy.com1".to_string(),
vec![
ConfigHeader::new(wmproxy::HeaderOper::Add, false, "from_proxy".to_string(), "mapping".to_string())
],
);
mapping_proxy.local_addr = Some(local_server_addr);
let proxy = ProxyConfig::builder()
.bind_addr(addr)
.server(Some(server_addr))
.center(true)
.mode("client".to_string())
.mapping(mapping)
.mapping(mapping_tcp)
.mapping(mapping_proxy)
.into_value()
.unwrap();
let _client_sender = run_mapping_client(proxy).await.unwrap();
fn do_build_req(url: &str, method: &str, body: &Vec<u8>) -> Request<Body> {
let body = BinaryMut::from(body.clone());
Request::builder()
.method(method)
.url(&*url)
.body(Body::new_binary(body))
.unwrap()
}
{
let url = &*format!("http://{}/", local_server_addr);
let client = Client::builder()
// .http2(false)
.http2_only(true)
.add_proxy(&*format!("http://{}", proxy_addr.unwrap())).unwrap()
.connect(&*url)
.await
.unwrap();
let mut res = client
.send_now(do_build_req(url, "GET", &vec![]))
.await
.unwrap();
let mut result = BinaryMut::new();
res.body_mut().read_all(&mut result).await;
// 测试头信息来确认是否来源于代理
assert_eq!(res.headers().get_value(&"from_proxy"), &"mapping");
assert_eq!(result.remaining(), HELLO_WORLD.as_bytes().len());
assert_eq!(result.as_slice(), HELLO_WORLD.as_bytes());
assert_eq!(res.version(), Version::Http2);
}
}

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