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use crate::node_selector::NodeSelector;
use crate::proxy::{ProxyConfig, ProxyConnector};
use crate::{
send, Agent, HostMetricsRegistry, HyperBody, Request, RequestBuilder, Response, UserAgent,
};
use arc_swap::ArcSwap;
use conjure_error::Error;
use conjure_runtime_config::ServiceConfig;
use hyper::client::HttpConnector;
use hyper::header::HeaderValue;
use hyper::Method;
use hyper_openssl::HttpsConnector;
use openssl::ssl::{SslConnector, SslMethod};
use std::sync::{Arc, Weak};
use std::time::Duration;
use witchcraft_log::info;
use witchcraft_metrics::{Meter, MetricId, MetricRegistry, Timer};
const TCP_KEEPALIVE: Duration = Duration::from_secs(3 * 60);
pub(crate) struct ClientState {
pub(crate) client: hyper::Client<HttpsConnector<ProxyConnector<HttpConnector>>, HyperBody>,
pub(crate) node_selector: NodeSelector,
pub(crate) max_num_retries: u32,
pub(crate) backoff_slot_size: Duration,
pub(crate) request_timeout: Duration,
pub(crate) proxy: ProxyConfig,
}
impl ClientState {
fn from_config(
service: &str,
host_metrics: &HostMetricsRegistry,
service_config: &ServiceConfig,
) -> Result<ClientState, Error> {
let mut connector = HttpConnector::new();
connector.enforce_http(false);
connector.set_nodelay(true);
connector.set_keepalive(Some(TCP_KEEPALIVE));
connector.set_connect_timeout(Some(service_config.connect_timeout()));
let proxy = ProxyConfig::from_config(service_config.proxy())?;
let connector = ProxyConnector::new(connector, &proxy);
let mut ssl = SslConnector::builder(SslMethod::tls()).map_err(Error::internal_safe)?;
ssl.set_alpn_protos(b"\x02h2\x08http/1.1")
.map_err(Error::internal_safe)?;
if let Some(ca_file) = service_config.security().ca_file() {
ssl.set_ca_file(ca_file).map_err(Error::internal_safe)?;
}
let connector =
HttpsConnector::with_connector(connector, ssl).map_err(Error::internal_safe)?;
let client = hyper::Client::builder().build(connector);
let node_selector = NodeSelector::new(service, host_metrics, service_config);
Ok(ClientState {
client,
node_selector,
max_num_retries: service_config.max_num_retries(),
backoff_slot_size: service_config.backoff_slot_size(),
request_timeout: service_config.request_timeout(),
proxy,
})
}
}
pub(crate) struct SharedClient {
pub(crate) service: String,
pub(crate) user_agent: HeaderValue,
pub(crate) state: ArcSwap<ClientState>,
pub(crate) host_metrics: Arc<HostMetricsRegistry>,
pub(crate) response_timer: Arc<Timer>,
pub(crate) error_meter: Arc<Meter>,
}
#[derive(Clone)]
pub struct Client {
pub(crate) shared: Arc<SharedClient>,
assume_idempotent: bool,
propagate_qos_errors: bool,
propagate_service_errors: bool,
}
impl Client {
pub fn new(
service: &str,
mut user_agent: UserAgent,
host_metrics: &Arc<HostMetricsRegistry>,
metrics: &Arc<MetricRegistry>,
config: &ServiceConfig,
) -> Result<Client, Error> {
user_agent.push_agent(Agent::new("conjure-runtime", env!("CARGO_PKG_VERSION")));
let state = ClientState::from_config(service, host_metrics, config)?;
let response_timer = metrics
.timer(MetricId::new("client.response").with_tag("service-name", service.to_string()));
let error_meter = metrics.meter(
MetricId::new("client.response.error")
.with_tag("service-name", service.to_string())
.with_tag("reason", "IOException"),
);
Ok(Client {
shared: Arc::new(SharedClient {
service: service.to_string(),
user_agent: HeaderValue::from_str(&user_agent.to_string()).unwrap(),
state: ArcSwap::new(Arc::new(state)),
host_metrics: host_metrics.clone(),
response_timer,
error_meter,
}),
assume_idempotent: false,
propagate_qos_errors: false,
propagate_service_errors: false,
})
}
pub fn set_assume_idempotent(&mut self, assume_idempotent: bool) {
self.assume_idempotent = assume_idempotent;
}
pub fn assume_idempotent(&self) -> bool {
self.assume_idempotent
}
pub fn set_propagate_qos_errors(&mut self, propagate_qos_errors: bool) {
self.propagate_qos_errors = propagate_qos_errors;
}
pub fn propagate_qos_errors(&self) -> bool {
self.propagate_qos_errors
}
pub fn set_propagate_service_errors(&mut self, propagate_service_errors: bool) {
self.propagate_service_errors = propagate_service_errors;
}
pub fn propagate_service_errors(&self) -> bool {
self.propagate_service_errors
}
pub fn request(&self, method: Method, pattern: &'static str) -> RequestBuilder<'_> {
RequestBuilder::new(self, method, pattern)
}
pub fn get(&self, pattern: &'static str) -> RequestBuilder<'_> {
self.request(Method::GET, pattern)
}
pub fn post(&self, pattern: &'static str) -> RequestBuilder<'_> {
self.request(Method::POST, pattern)
}
pub fn put(&self, pattern: &'static str) -> RequestBuilder<'_> {
self.request(Method::PUT, pattern)
}
pub fn delete(&self, pattern: &'static str) -> RequestBuilder<'_> {
self.request(Method::DELETE, pattern)
}
pub fn patch(&self, pattern: &'static str) -> RequestBuilder<'_> {
self.request(Method::PATCH, pattern)
}
pub fn refresh_handle(&self) -> RefreshHandle {
RefreshHandle(Arc::downgrade(&self.shared))
}
pub(crate) async fn send(&self, request: Request<'_>) -> Result<Response, Error> {
send::send(self, request).await
}
}
pub struct RefreshHandle(Weak<SharedClient>);
impl RefreshHandle {
pub fn refresh(&self, config: &ServiceConfig) -> Result<(), Error> {
let client = match self.0.upgrade() {
Some(client) => client,
None => return Ok(()),
};
let state = ClientState::from_config(&client.service, &client.host_metrics, config)?;
client.state.store(Arc::new(state));
info!("reloaded client", safe: { service: client.service });
Ok(())
}
pub fn has_dropped(&self) -> bool {
self.0.upgrade().is_none()
}
}