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// Copyright 2024 Cloudflare, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
use async_trait::async_trait;
use bytes::Bytes;
use clap::Parser;
use log::info;
use prometheus::register_int_counter;
use pingora_core::server::configuration::Opt;
use pingora_core::server::Server;
use pingora_core::upstreams::peer::HttpPeer;
use pingora_core::Result;
use pingora_http::ResponseHeader;
use pingora_proxy::{ProxyHttp, Session};
fn check_login(req: &pingora_http::RequestHeader) -> bool {
// implement you logic check logic here
req.headers.get("Authorization").map(|v| v.as_bytes()) == Some(b"password")
}
pub struct MyGateway {
req_metric: prometheus::IntCounter,
}
#[async_trait]
impl ProxyHttp for MyGateway {
type CTX = ();
fn new_ctx(&self) -> Self::CTX {}
async fn request_filter(&self, session: &mut Session, _ctx: &mut Self::CTX) -> Result<bool> {
if session.req_header().uri.path().starts_with("/login")
&& !check_login(session.req_header())
{
let _ = session
.respond_error_with_body(403, Bytes::from_static(b"no way!"))
.await;
// true: early return as the response is already written
return Ok(true);
}
Ok(false)
}
async fn upstream_peer(
&self,
session: &mut Session,
_ctx: &mut Self::CTX,
) -> Result<Box<HttpPeer>> {
let addr = if session.req_header().uri.path().starts_with("/family") {
("1.0.0.1", 443)
} else {
("1.1.1.1", 443)
};
info!("connecting to {addr:?}");
let peer = Box::new(HttpPeer::new(addr, true, "one.one.one.one".to_string()));
Ok(peer)
}
async fn response_filter(
&self,
_session: &mut Session,
upstream_response: &mut ResponseHeader,
_ctx: &mut Self::CTX,
) -> Result<()>
where
Self::CTX: Send + Sync,
{
// replace existing header if any
upstream_response
.insert_header("Server", "MyGateway")
.unwrap();
// because we don't support h3
upstream_response.remove_header("alt-svc");
Ok(())
}
async fn logging(
&self,
session: &mut Session,
_e: Option<&pingora_core::Error>,
ctx: &mut Self::CTX,
) {
let response_code = session
.response_written()
.map_or(0, |resp| resp.status.as_u16());
info!(
"{} response code: {response_code}",
self.request_summary(session, ctx)
);
self.req_metric.inc();
}
}
// RUST_LOG=INFO cargo run --example gateway
// curl 127.0.0.1:6191 -H "Host: one.one.one.one"
// curl 127.0.0.1:6190/family/ -H "Host: one.one.one.one"
// curl 127.0.0.1:6191/login/ -H "Host: one.one.one.one" -I -H "Authorization: password"
// curl 127.0.0.1:6191/login/ -H "Host: one.one.one.one" -I -H "Authorization: bad"
// For metrics
// curl 127.0.0.1:6192/
fn main() {
env_logger::init();
// read command line arguments
let opt = Opt::parse();
let mut my_server = Server::new(Some(opt)).unwrap();
my_server.bootstrap();
let mut my_proxy = pingora_proxy::http_proxy_service(
&my_server.configuration,
MyGateway {
req_metric: register_int_counter!("req_counter", "Number of requests").unwrap(),
},
);
my_proxy.add_tcp("0.0.0.0:6191");
my_server.add_service(my_proxy);
let mut prometheus_service_http =
pingora_core::services::listening::Service::prometheus_http_service();
prometheus_service_http.add_tcp("127.0.0.1:6192");
my_server.add_service(prometheus_service_http);
my_server.run_forever();
}
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