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795594db83
--- Fixed formatting Includes-commit:05f9754166
Includes-commit:29286c7e71
Replicated-from: https://github.com/cloudflare/pingora/pull/239
140 lines
3.7 KiB
Rust
140 lines
3.7 KiB
Rust
// Copyright 2024 Cloudflare, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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use async_trait::async_trait;
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use bytes::Bytes;
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use clap::Parser;
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use serde::{Deserialize, Serialize};
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use std::net::ToSocketAddrs;
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use pingora_core::server::configuration::Opt;
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use pingora_core::server::Server;
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use pingora_core::upstreams::peer::HttpPeer;
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use pingora_core::Result;
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use pingora_http::ResponseHeader;
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use pingora_proxy::{ProxyHttp, Session};
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const HOST: &str = "ip.jsontest.com";
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#[derive(Serialize, Deserialize)]
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pub struct Resp {
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ip: String,
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}
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pub struct Json2Yaml {
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addr: std::net::SocketAddr,
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}
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pub struct MyCtx {
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buffer: Vec<u8>,
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}
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#[async_trait]
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impl ProxyHttp for Json2Yaml {
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type CTX = MyCtx;
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fn new_ctx(&self) -> Self::CTX {
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MyCtx { buffer: vec![] }
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}
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async fn upstream_peer(
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&self,
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_session: &mut Session,
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_ctx: &mut Self::CTX,
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) -> Result<Box<HttpPeer>> {
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let peer = Box::new(HttpPeer::new(self.addr, false, HOST.to_owned()));
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Ok(peer)
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}
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async fn upstream_request_filter(
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&self,
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_session: &mut Session,
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upstream_request: &mut pingora_http::RequestHeader,
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_ctx: &mut Self::CTX,
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) -> Result<()> {
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upstream_request
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.insert_header("Host", HOST.to_owned())
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.unwrap();
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Ok(())
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}
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async fn response_filter(
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&self,
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_session: &mut Session,
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upstream_response: &mut ResponseHeader,
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_ctx: &mut Self::CTX,
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) -> Result<()>
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where
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Self::CTX: Send + Sync,
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{
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// Remove content-length because the size of the new body is unknown
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upstream_response.remove_header("Content-Length");
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upstream_response
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.insert_header("Transfer-Encoding", "Chunked")
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.unwrap();
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Ok(())
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}
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fn response_body_filter(
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&self,
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_session: &mut Session,
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body: &mut Option<Bytes>,
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end_of_stream: bool,
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ctx: &mut Self::CTX,
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) -> Result<Option<std::time::Duration>>
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where
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Self::CTX: Send + Sync,
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{
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// buffer the data
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if let Some(b) = body {
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ctx.buffer.extend(&b[..]);
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// drop the body
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b.clear();
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}
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if end_of_stream {
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// This is the last chunk, we can process the data now
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let json_body: Resp = serde_json::de::from_slice(&ctx.buffer).unwrap();
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let yaml_body = serde_yaml::to_string(&json_body).unwrap();
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*body = Some(Bytes::copy_from_slice(yaml_body.as_bytes()));
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}
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Ok(None)
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}
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}
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// RUST_LOG=INFO cargo run --example modify_response
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// curl 127.0.0.1:6191
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fn main() {
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env_logger::init();
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let opt = Opt::parse();
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let mut my_server = Server::new(Some(opt)).unwrap();
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my_server.bootstrap();
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let mut my_proxy = pingora_proxy::http_proxy_service(
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&my_server.configuration,
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Json2Yaml {
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// hardcode the IP of ip.jsontest.com for now
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addr: ("142.251.2.121", 80)
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.to_socket_addrs()
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.unwrap()
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.next()
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.unwrap(),
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},
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);
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my_proxy.add_tcp("127.0.0.1:6191");
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my_server.add_service(my_proxy);
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my_server.run_forever();
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}
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