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multi_watcher.rs
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multi_watcher.rs
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#[macro_use] extern crate log;
use futures::{stream, StreamExt, TryStreamExt};
use k8s_openapi::api::{
apps::v1::Deployment,
core::v1::{ConfigMap, Secret},
};
use kube::{
api::{Api, ListParams, ResourceExt},
Client,
};
use kube_runtime::{utils::try_flatten_applied, watcher};
#[tokio::main]
async fn main() -> anyhow::Result<()> {
std::env::set_var("RUST_LOG", "info,multi_watcher=debug,kube=debug");
env_logger::init();
let client = Client::try_default().await?;
let namespace = std::env::var("NAMESPACE").unwrap_or("default".into());
let deploys: Api<Deployment> = Api::namespaced(client.clone(), &namespace);
let cms: Api<ConfigMap> = Api::namespaced(client.clone(), &namespace);
let secret: Api<Secret> = Api::namespaced(client.clone(), &namespace);
let dep_watcher = watcher(deploys, ListParams::default());
let cm_watcher = watcher(cms, ListParams::default());
let sec_watcher = watcher(secret, ListParams::default());
// select on applied events from all watchers
let mut combo_stream = stream::select_all(vec![
try_flatten_applied(dep_watcher).map_ok(Watched::Deploy).boxed(),
try_flatten_applied(cm_watcher).map_ok(Watched::Config).boxed(),
try_flatten_applied(sec_watcher).map_ok(Watched::Secret).boxed(),
]);
// SelectAll Stream elements must have the same Item, so all packed in this:
enum Watched {
Config(ConfigMap),
Deploy(Deployment),
Secret(Secret),
}
while let Some(o) = combo_stream.try_next().await? {
match o {
Watched::Config(cm) => info!("Got configmap: {}", cm.name()),
Watched::Deploy(d) => info!("Got deployment: {}", d.name()),
Watched::Secret(s) => info!("Got secret: {}", s.name()),
}
}
Ok(())
}