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configmapgen_controller.rs
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configmapgen_controller.rs
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#[macro_use] extern crate log;
use color_eyre::{Report, Result};
use futures::StreamExt;
use k8s_openapi::{
api::core::v1::ConfigMap,
apimachinery::pkg::apis::meta::v1::{ObjectMeta, OwnerReference},
};
use kube::{
api::{ListParams, Patch, PatchParams, Resource},
Api, Client, CustomResource,
};
use kube_runtime::controller::{Context, Controller, ReconcilerAction};
use schemars::JsonSchema;
use serde::{Deserialize, Serialize};
use snafu::{Backtrace, OptionExt, ResultExt, Snafu};
use std::collections::BTreeMap;
use tokio::time::Duration;
#[derive(Debug, Snafu)]
enum Error {
#[snafu(display("Failed to create ConfigMap: {}", source))]
ConfigMapCreationFailed {
source: kube::Error,
backtrace: Backtrace,
},
MissingObjectKey {
name: &'static str,
backtrace: Backtrace,
},
}
#[derive(CustomResource, Debug, Clone, Deserialize, Serialize, JsonSchema)]
#[kube(group = "nullable.se", version = "v1", kind = "ConfigMapGenerator")]
#[kube(shortname = "cmg", namespaced)]
struct ConfigMapGeneratorSpec {
content: String,
}
fn object_to_owner_reference<K: Resource<DynamicType = ()>>(
meta: ObjectMeta,
) -> Result<OwnerReference, Error> {
Ok(OwnerReference {
api_version: K::api_version(&()).to_string(),
kind: K::kind(&()).to_string(),
name: meta.name.context(MissingObjectKey {
name: ".metadata.name",
})?,
uid: meta.uid.context(MissingObjectKey {
name: ".metadata.uid",
})?,
..OwnerReference::default()
})
}
/// Controller triggers this whenever our main object or our children changed
async fn reconcile(generator: ConfigMapGenerator, ctx: Context<Data>) -> Result<ReconcilerAction, Error> {
let client = ctx.get_ref().client.clone();
let mut contents = BTreeMap::new();
contents.insert("content".to_string(), generator.spec.content);
let cm = ConfigMap {
metadata: ObjectMeta {
name: generator.metadata.name.clone(),
owner_references: Some(vec![OwnerReference {
controller: Some(true),
..object_to_owner_reference::<ConfigMapGenerator>(generator.metadata.clone())?
}]),
..ObjectMeta::default()
},
data: Some(contents),
..Default::default()
};
let cm_api = Api::<ConfigMap>::namespaced(
client.clone(),
generator.metadata.namespace.as_ref().context(MissingObjectKey {
name: ".metadata.namespace",
})?,
);
cm_api
.patch(
cm.metadata.name.as_ref().context(MissingObjectKey {
name: ".metadata.name",
})?,
&PatchParams::apply("configmapgenerator.kube-rt.nullable.se"),
&Patch::Apply(&cm),
)
.await
.context(ConfigMapCreationFailed)?;
Ok(ReconcilerAction {
requeue_after: Some(Duration::from_secs(300)),
})
}
/// The controller triggers this on reconcile errors
fn error_policy(_error: &Error, _ctx: Context<Data>) -> ReconcilerAction {
ReconcilerAction {
requeue_after: Some(Duration::from_secs(1)),
}
}
// Data we want access to in error/reconcile calls
struct Data {
client: Client,
}
#[tokio::main]
async fn main() -> Result<()> {
std::env::set_var("RUST_LOG", "info,kube-runtime=debug,kube=debug");
env_logger::init();
let client = Client::try_default().await?;
let cmgs = Api::<ConfigMapGenerator>::all(client.clone());
let cms = Api::<ConfigMap>::all(client.clone());
Controller::new(cmgs, ListParams::default())
.owns(cms, ListParams::default())
.run(reconcile, error_policy, Context::new(Data { client }))
.for_each(|res| async move {
match res {
Ok(o) => info!("reconciled {:?}", o),
Err(e) => warn!("reconcile failed: {}", Report::from(e)),
}
})
.await;
Ok(())
}