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use std::convert::TryFrom;
use bytes::Bytes;
use either::{Either, Left, Right};
use futures::{self, Stream, StreamExt, TryStream, TryStreamExt};
use http::{self, Request, Response, StatusCode};
use hyper::{client::HttpConnector, Body};
use hyper_timeout::TimeoutConnector;
use k8s_openapi::apimachinery::pkg::apis::meta::v1 as k8s_meta_v1;
pub use kube_core::response::Status;
use serde::de::DeserializeOwned;
use serde_json::{self, Value};
#[cfg(feature = "ws")]
use tokio_tungstenite::{tungstenite as ws, WebSocketStream};
use tokio_util::{
codec::{FramedRead, LinesCodec, LinesCodecError},
io::StreamReader,
};
use tower::{buffer::Buffer, util::BoxService, BoxError, Layer, Service, ServiceBuilder, ServiceExt};
use tower_http::{
classify::ServerErrorsFailureClass, map_response_body::MapResponseBodyLayer, trace::TraceLayer,
};
use crate::{api::WatchEvent, error::ErrorResponse, Config, Error, Result};
mod auth;
mod body;
use body::BodyStreamExt;
mod config_ext;
pub use config_ext::ConfigExt;
pub mod middleware;
#[cfg(any(feature = "native-tls", feature = "rustls-tls"))] mod tls;
#[cfg(feature = "ws")]
const WS_PROTOCOL: &str = "v4.channel.k8s.io";
#[cfg_attr(docsrs, doc(cfg(feature = "client")))]
#[derive(Clone)]
pub struct Client {
inner: Buffer<BoxService<Request<Body>, Response<Body>, BoxError>, Request<Body>>,
default_ns: String,
}
impl Client {
pub fn new<S, B>(service: S) -> Self
where
S: Service<Request<Body>, Response = Response<B>> + Send + 'static,
S::Future: Send + 'static,
S::Error: Into<BoxError>,
B: http_body::Body<Data = bytes::Bytes> + Send + 'static,
B::Error: std::error::Error + Send + Sync + 'static,
{
Self::new_with_default_ns(service, "default")
}
fn new_with_default_ns<S, B, T: Into<String>>(service: S, default_ns: T) -> Self
where
S: Service<Request<Body>, Response = Response<B>> + Send + 'static,
S::Future: Send + 'static,
S::Error: Into<BoxError>,
B: http_body::Body<Data = bytes::Bytes> + Send + 'static,
B::Error: std::error::Error + Send + Sync + 'static,
{
let service = MapResponseBodyLayer::new(|b: B| Body::wrap_stream(b.into_stream()))
.layer(service)
.map_err(|e| e.into());
Self {
inner: Buffer::new(BoxService::new(service), 1024),
default_ns: default_ns.into(),
}
}
pub async fn try_default() -> Result<Self> {
Self::try_from(Config::infer().await?)
}
pub(crate) fn default_ns(&self) -> &str {
&self.default_ns
}
async fn send(&self, request: Request<Body>) -> Result<Response<Body>> {
let mut svc = self.inner.clone();
let res = svc
.ready()
.await
.map_err(Error::Service)?
.call(request)
.await
.map_err(|err| {
if err.is::<Error>() {
*err.downcast::<Error>().expect("kube::Error")
} else if err.is::<hyper::Error>() {
Error::HyperError(*err.downcast::<hyper::Error>().expect("hyper::Error"))
} else {
Error::Service(err)
}
})?;
Ok(res)
}
#[cfg(feature = "ws")]
#[cfg_attr(docsrs, doc(cfg(feature = "ws")))]
pub async fn connect(
&self,
request: Request<Vec<u8>>,
) -> Result<WebSocketStream<hyper::upgrade::Upgraded>> {
use http::header::HeaderValue;
let (mut parts, body) = request.into_parts();
parts
.headers
.insert(http::header::CONNECTION, HeaderValue::from_static("Upgrade"));
parts
.headers
.insert(http::header::UPGRADE, HeaderValue::from_static("websocket"));
parts.headers.insert(
http::header::SEC_WEBSOCKET_VERSION,
HeaderValue::from_static("13"),
);
let key = sec_websocket_key();
parts.headers.insert(
http::header::SEC_WEBSOCKET_KEY,
key.parse().expect("valid header value"),
);
parts.headers.insert(
http::header::SEC_WEBSOCKET_PROTOCOL,
HeaderValue::from_static(WS_PROTOCOL),
);
let res = self.send(Request::from_parts(parts, Body::from(body))).await?;
verify_upgrade_response(&res, &key)?;
match hyper::upgrade::on(res).await {
Ok(upgraded) => {
Ok(WebSocketStream::from_raw_socket(upgraded, ws::protocol::Role::Client, None).await)
}
Err(e) => Err(Error::HyperError(e)),
}
}
pub async fn request<T>(&self, request: Request<Vec<u8>>) -> Result<T>
where
T: DeserializeOwned,
{
let text = self.request_text(request).await?;
serde_json::from_str(&text).map_err(|e| {
tracing::warn!("{}, {:?}", text, e);
Error::SerdeError(e)
})
}
pub async fn request_text(&self, request: Request<Vec<u8>>) -> Result<String> {
let res = self.send(request.map(Body::from)).await?;
let status = res.status();
let body_bytes = hyper::body::to_bytes(res.into_body()).await?;
let text = String::from_utf8(body_bytes.to_vec())?;
handle_api_errors(&text, status)?;
Ok(text)
}
pub async fn request_text_stream(
&self,
request: Request<Vec<u8>>,
) -> Result<impl Stream<Item = Result<Bytes>>> {
let res = self.send(request.map(Body::from)).await?;
Ok(res.into_body().map_err(Error::HyperError))
}
pub async fn request_status<T>(&self, request: Request<Vec<u8>>) -> Result<Either<T, Status>>
where
T: DeserializeOwned,
{
let text = self.request_text(request).await?;
let v: Value = serde_json::from_str(&text)?;
if v["kind"] == "Status" {
tracing::trace!("Status from {}", text);
Ok(Right(serde_json::from_str::<Status>(&text).map_err(|e| {
tracing::warn!("{}, {:?}", text, e);
Error::SerdeError(e)
})?))
} else {
Ok(Left(serde_json::from_str::<T>(&text).map_err(|e| {
tracing::warn!("{}, {:?}", text, e);
Error::SerdeError(e)
})?))
}
}
pub async fn request_events<T>(
&self,
request: Request<Vec<u8>>,
) -> Result<impl TryStream<Item = Result<WatchEvent<T>>>>
where
T: Clone + DeserializeOwned,
{
let res = self.send(request.map(Body::from)).await?;
tracing::trace!("headers: {:?}", res.headers());
let frames = FramedRead::new(
StreamReader::new(res.into_body().map_err(|e| {
if e.is_timeout() {
return std::io::Error::new(std::io::ErrorKind::TimedOut, e);
}
if e.to_string().contains("unexpected EOF during chunk") {
return std::io::Error::new(std::io::ErrorKind::UnexpectedEof, e);
}
std::io::Error::new(std::io::ErrorKind::Other, e)
})),
LinesCodec::new(),
);
Ok(frames.filter_map(|res| async {
match res {
Ok(line) => match serde_json::from_str::<WatchEvent<T>>(&line) {
Ok(event) => Some(Ok(event)),
Err(e) => {
if e.is_eof() {
return None;
}
if let Ok(e_resp) = serde_json::from_str::<ErrorResponse>(&line) {
return Some(Err(Error::Api(e_resp)));
}
Some(Err(Error::SerdeError(e)))
}
},
Err(LinesCodecError::Io(e)) => match e.kind() {
std::io::ErrorKind::TimedOut => {
tracing::warn!("timeout in poll: {}", e);
None
}
std::io::ErrorKind::UnexpectedEof => {
tracing::warn!("eof in poll: {}", e);
None
}
_ => Some(Err(Error::ReadEvents(e))),
},
Err(LinesCodecError::MaxLineLengthExceeded) => {
Some(Err(Error::LinesCodecMaxLineLengthExceeded))
}
}
}))
}
}
impl Client {
pub async fn apiserver_version(&self) -> Result<k8s_openapi::apimachinery::pkg::version::Info> {
self.request(Request::builder().uri("/version").body(vec![])?)
.await
}
pub async fn list_api_groups(&self) -> Result<k8s_meta_v1::APIGroupList> {
self.request(Request::builder().uri("/apis").body(vec![])?).await
}
pub async fn list_api_group_resources(&self, apiversion: &str) -> Result<k8s_meta_v1::APIResourceList> {
let url = format!("/apis/{}", apiversion);
self.request(Request::builder().uri(url).body(vec![])?).await
}
pub async fn list_core_api_versions(&self) -> Result<k8s_meta_v1::APIVersions> {
self.request(Request::builder().uri("/api").body(vec![])?).await
}
pub async fn list_core_api_resources(&self, version: &str) -> Result<k8s_meta_v1::APIResourceList> {
let url = format!("/api/{}", version);
self.request(Request::builder().uri(url).body(vec![])?).await
}
}
fn handle_api_errors(text: &str, s: StatusCode) -> Result<()> {
if s.is_client_error() || s.is_server_error() {
if let Ok(errdata) = serde_json::from_str::<ErrorResponse>(text) {
tracing::debug!("Unsuccessful: {:?}", errdata);
Err(Error::Api(errdata))
} else {
tracing::warn!("Unsuccessful data error parse: {}", text);
let ae = ErrorResponse {
status: s.to_string(),
code: s.as_u16(),
message: format!("{:?}", text),
reason: "Failed to parse error data".into(),
};
tracing::debug!("Unsuccessful: {:?} (reconstruct)", ae);
Err(Error::Api(ae))
}
} else {
Ok(())
}
}
impl TryFrom<Config> for Client {
type Error = Error;
fn try_from(config: Config) -> Result<Self> {
use std::time::Duration;
use http::header::HeaderMap;
use tracing::Span;
let timeout = config.timeout;
let default_ns = config.default_ns.clone();
let client: hyper::Client<_, Body> = {
let mut connector = HttpConnector::new();
connector.enforce_http(false);
#[cfg(feature = "native-tls")]
let connector = hyper_tls::HttpsConnector::from((
connector,
tokio_native_tls::TlsConnector::from(config.native_tls_connector()?),
));
#[cfg(all(not(feature = "native-tls"), feature = "rustls-tls"))]
let connector = hyper_rustls::HttpsConnector::from((
connector,
std::sync::Arc::new(config.rustls_client_config()?),
));
let mut connector = TimeoutConnector::new(connector);
connector.set_connect_timeout(timeout);
connector.set_read_timeout(timeout);
hyper::Client::builder().build(connector)
};
let stack = ServiceBuilder::new().layer(config.base_uri_layer()).into_inner();
#[cfg(feature = "gzip")]
let stack = ServiceBuilder::new()
.layer(stack)
.layer(tower_http::decompression::DecompressionLayer::new())
.into_inner();
let service = ServiceBuilder::new()
.layer(stack)
.option_layer(config.auth_layer()?)
.layer(
TraceLayer::new_for_http()
.make_span_with(|req: &Request<hyper::Body>| {
tracing::debug_span!(
"HTTP",
http.method = %req.method(),
http.url = %req.uri(),
http.status_code = tracing::field::Empty,
otel.name = req.extensions().get::<&'static str>().unwrap_or(&"HTTP"),
otel.kind = "client",
otel.status_code = tracing::field::Empty,
)
})
.on_request(|_req: &Request<hyper::Body>, _span: &Span| {
tracing::debug!("requesting");
})
.on_response(|res: &Response<hyper::Body>, _latency: Duration, span: &Span| {
let status = res.status();
span.record("http.status_code", &status.as_u16());
if status.is_client_error() || status.is_server_error() {
span.record("otel.status_code", &"ERROR");
}
})
.on_body_chunk(())
.on_eos(|_: Option<&HeaderMap>, _duration: Duration, _span: &Span| {
tracing::debug!("stream closed");
})
.on_failure(|ec: ServerErrorsFailureClass, _latency: Duration, span: &Span| {
span.record("otel.status_code", &"ERROR");
match ec {
ServerErrorsFailureClass::StatusCode(status) => {
span.record("http.status_code", &status.as_u16());
tracing::error!("failed with status {}", status)
}
ServerErrorsFailureClass::Error(err) => {
tracing::error!("failed with error {}", err)
}
}
}),
)
.service(client);
Ok(Self::new_with_default_ns(service, default_ns))
}
}
#[cfg(feature = "ws")]
fn verify_upgrade_response(res: &Response<Body>, key: &str) -> Result<()> {
if res.status() != StatusCode::SWITCHING_PROTOCOLS {
return Err(Error::ProtocolSwitch(res.status()));
}
let headers = res.headers();
if !headers
.get(http::header::UPGRADE)
.and_then(|h| h.to_str().ok())
.map(|h| h.eq_ignore_ascii_case("websocket"))
.unwrap_or(false)
{
return Err(Error::MissingUpgradeWebSocketHeader);
}
if !headers
.get(http::header::CONNECTION)
.and_then(|h| h.to_str().ok())
.map(|h| h.eq_ignore_ascii_case("Upgrade"))
.unwrap_or(false)
{
return Err(Error::MissingConnectionUpgradeHeader);
}
let accept_key = ws::handshake::derive_accept_key(key.as_ref());
if !headers
.get(http::header::SEC_WEBSOCKET_ACCEPT)
.map(|h| h == &accept_key)
.unwrap_or(false)
{
return Err(Error::SecWebSocketAcceptKeyMismatch);
}
if !headers
.get(http::header::SEC_WEBSOCKET_PROTOCOL)
.map(|h| h == WS_PROTOCOL)
.unwrap_or(false)
{
return Err(Error::SecWebSocketProtocolMismatch);
}
Ok(())
}
#[cfg(feature = "ws")]
fn sec_websocket_key() -> String {
let r: [u8; 16] = rand::random();
base64::encode(&r)
}
#[cfg(test)]
mod tests {
use crate::{Api, Client};
use futures::pin_mut;
use http::{Request, Response};
use hyper::Body;
use k8s_openapi::api::core::v1::Pod;
use tower_test::mock;
#[tokio::test]
async fn test_mock() {
let (mock_service, handle) = mock::pair::<Request<Body>, Response<Body>>();
let spawned = tokio::spawn(async move {
pin_mut!(handle);
let (request, send) = handle.next_request().await.expect("service not called");
assert_eq!(request.method(), http::Method::GET);
assert_eq!(request.uri().to_string(), "/api/v1/namespaces/default/pods/test");
let pod: Pod = serde_json::from_value(serde_json::json!({
"apiVersion": "v1",
"kind": "Pod",
"metadata": {
"name": "test",
"annotations": { "kube-rs": "test" },
},
"spec": {
"containers": [{ "name": "test", "image": "test-image" }],
}
}))
.unwrap();
send.send_response(
Response::builder()
.body(Body::from(serde_json::to_vec(&pod).unwrap()))
.unwrap(),
);
});
let pods: Api<Pod> = Api::namespaced(Client::new(mock_service), "default");
let pod = pods.get("test").await.unwrap();
assert_eq!(pod.metadata.annotations.unwrap().get("kube-rs").unwrap(), "test");
spawned.await.unwrap();
}
}