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"Prometheus exporter that exposes pod's ephemeral storage metrics" +license = "MIT" + +[dependencies] +anyhow = "1.0.80" +bytes = "1.5.0" +env_logger = { version = "0.11.2" } +futures = "0.3.30" +http-body-util = "0.1.1" +hyper = { version = "1.2.0", features = ["full"]} +hyper-util = { version = "0.1.3", features = ["full"]} +k8s-openapi = { version = "0.21.1", default-features = false, features = ["v1_29"] } +kube = { version = "0.88.1", features = ["runtime","derive"] } +lazy_static = "1.4.0" +log = "0.4.21" +openssl = "0.10" +openssl-sys = "0.9" +prometheus = { version = "0.13.3" } +prometheus-client = "0.22.2" +reqwest = { version = "0.11.24", features = ["json"] } +serde = { version = "1.0.197" } +serde_json = "1.0.115" +tokio = { version = "1.36.0", features = ["full"] } +url = "2.5.0" diff --git a/Dockerfile b/Dockerfile new file mode 100644 index 0000000..b82ba19 --- /dev/null +++ b/Dockerfile @@ -0,0 +1,28 @@ +# -*- mode: dockerfile -*- +FROM rust:1.77 as builder + +WORKDIR /usr/src/kube-stats-exporter +COPY . . +RUN cargo install --path . + +FROM debian:bookworm-slim + +WORKDIR /kube-stats-exporter + +RUN groupadd --system -g 1500 kubestats && \ + useradd --system --gid 1500 \ + -M -d /kube-stats-exporter \ + -s /sbin/nologin \ + --uid 1500 kubestats \ + && chown -R kubestats:kubestats /kube-stats-exporter \ + && apt-get update \ + && apt-get install -y libssl-dev curl net-tools \ + && rm -rf /var/lib/apt/lists/* + +COPY --from=builder \ + /usr/local/cargo/bin/kube-stats-exporter \ + /usr/local/bin/kube-stats-exporter + +USER 1500:1500 +EXPOSE 9100 +ENTRYPOINT ["/usr/local/bin/kube-stats-exporter"] diff --git a/LICENSE-MIT b/LICENSE-MIT new file mode 100644 index 0000000..c1c19c9 --- /dev/null +++ b/LICENSE-MIT @@ -0,0 +1,21 @@ +MIT License + +Copyright (c) 2024 Jimena Cabrera Notari + +Permission is hereby granted, free of charge, to any person obtaining a copy +of this software and associated documentation files (the "Software"), to deal +in the Software without restriction, including without limitation the rights +to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +copies of the Software, and to permit persons to whom the Software is +furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in all +copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE +SOFTWARE. diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..01a3ed3 --- /dev/null +++ b/Makefile @@ -0,0 +1,39 @@ +NAME = kube-stats-exporter +IMAGE = kube-stats-exporter +TAG ?= test +K8S_VERSION = "1.29" + +clean: + cargo clean + +build: + cargo build + +image: clean-image + docker build \ + --no-cache \ + --rm \ + -t $(IMAGE):$(TAG) \ + -f Dockerfile . + +push-image: + docker build \ + --no-cache \ + --rm \ + -t ghrc.io/phenomenes/$(IMAGE):$(TAG) . + +clean-image: + -docker rmi -f $(IMAGE)/$(TAG) >/dev/null 2>&1 + +chart: lint-chart + helm package charts + +lint-chart: + helm lint charts/ --values charts/values.yaml + +minikube: + minikube delete || true + minikube start \ + --kubernetes-version="$(K8S_VERSION)" \ + --cpus=2 \ + --memory=4800MB diff --git a/README.md b/README.md new file mode 100644 index 0000000..a4c2e4d --- /dev/null +++ b/README.md @@ -0,0 +1,44 @@ +# kube-stats-exporter + +kube-stats-exporter collects pod's ephemeral storage metrics from Kubernetes +Summary data. + +```bash +kubectl get --raw /api/v1/nodes//proxy/stats/summary +``` + +These metrics are currently not available on the kubelet `/metrics` endpoint +see https://github.com/kubernetes/kubernetes/issues/69507 for more information + +## Run the exporter + +To run `kube-stats-metrics` locally, compile and the binary and start a proxy +to the Kubernetes API and compile/run the binary + +```shell +cargo build --release +# copy the binary to your preferred location + +kubectl proxy --port=8001 +export API_HOST=127.0.0.1:8001 && /path/to/the/binary/kube-stats-metrics +``` + +Get the metrics + +```shell +curl http://0.0.0.0:9100/metrics + +# HELP kube_pod_ephemeral_storage_available_bytes Pod ephemeral storage available bytes. +# TYPE kube_pod_ephemeral_storage_available_bytes gauge +kube_pod_ephemeral_storage_available_bytes{pod="cilium-dxcgl",namespace="kube-system",node="ip-10-101-93-232.eu-west-2.compute.internal",uid="2b0c8b43-d32d-4e72-9bf8-e20413e495cf"} 98145308672 +# HELP kube_pod_ephemeral_storage_capacity_bytes Pod ephemeral storage capacity bytes. +# TYPE kube_pod_ephemeral_storage_capacity_bytes gauge +kube_pod_ephemeral_storage_capacity_bytes{pod="image-automation-controller-75448b455d-dnkjn",namespace="flux-system",node="ip-10-101-87-27.eu-west-2.compute.internal",uid="add6c99e-9e3b-4593-a948-d09059f4d5e6"} 107361579008 +# HELP kube_pod_ephemeral_storage_used_bytes Pod ephemeral storage used bytes. +# TYPE kube_pod_ephemeral_storage_used_bytes gauge +kube_pod_ephemeral_storage_used_bytes{pod="missing-container-metrics-8j96p",namespace="missing-container-metrics",node="ip-10-101-86-90.eu-west-2.compute.internal",uid="b3ce48c4-a65f-48a7-8d56-bcb9a760f5f2"} 8192 +# HELP kube_stats_exporter_build_info kube-stats-exporter build info. +# TYPE kube_stats_exporter_build_info gauge +kube_stats_exporter_build_info{version="0.1.0",revision="945ef42"} 1 +EOF +``` diff --git a/build.rs b/build.rs new file mode 100644 index 0000000..8cf8544 --- /dev/null +++ b/build.rs @@ -0,0 +1,10 @@ +use std::process::Command; + +fn main() { + let output = Command::new("git") + .args(["rev-parse", "--short", "HEAD"]) + .output() + .unwrap(); + let git_hash = String::from_utf8(output.stdout).unwrap(); + println!("cargo:rustc-env=GIT_HASH={}", git_hash); +} diff --git a/chart/.helmignore b/chart/.helmignore new file mode 100644 index 0000000..0e8a0eb --- /dev/null +++ b/chart/.helmignore @@ -0,0 +1,23 @@ +# Patterns to ignore when building packages. +# This supports shell glob matching, relative path matching, and +# negation (prefixed with !). Only one pattern per line. +.DS_Store +# Common VCS dirs +.git/ +.gitignore +.bzr/ +.bzrignore +.hg/ +.hgignore +.svn/ +# Common backup files +*.swp +*.bak +*.tmp +*.orig +*~ +# Various IDEs +.project +.idea/ +*.tmproj +.vscode/ diff --git a/chart/Chart.yaml b/chart/Chart.yaml new file mode 100644 index 0000000..4c018a8 --- /dev/null +++ b/chart/Chart.yaml @@ -0,0 +1,7 @@ +--- +apiVersion: v2 +name: kube-stats-exporter +description: A Helm Chart for Prometheus kube-stats-exporter +type: application +version: 0.1.0 +appVersion: 0.1.0 diff --git a/chart/templates/_helpers.tpl b/chart/templates/_helpers.tpl new file mode 100644 index 0000000..725211d --- /dev/null +++ b/chart/templates/_helpers.tpl @@ -0,0 +1,73 @@ +{{/* +Expand the name of the chart. +*/}} +{{- define "kube-stats-exporter.name" -}} +{{- default .Chart.Name .Values.nameOverride | trunc 63 | trimSuffix "-" }} +{{- end }} + +{{/* +Create a default fully qualified app name. +We truncate at 63 chars because some Kubernetes name fields are limited to this (by the DNS naming spec). +If release name contains chart name it will be used as a full name. +*/}} +{{- define "kube-stats-exporter.fullname" -}} +{{- if .Values.fullnameOverride }} +{{- .Values.fullnameOverride | trunc 63 | trimSuffix "-" }} +{{- else }} +{{- $name := default .Chart.Name .Values.nameOverride }} +{{- if contains $name .Release.Name }} +{{- .Release.Name | trunc 63 | trimSuffix "-" }} +{{- else }} +{{- printf "%s-%s" .Release.Name $name | trunc 63 | trimSuffix "-" }} +{{- end }} +{{- end }} +{{- end }} + +{{/* +Create chart name and version as used by the chart label. +*/}} +{{- define "kube-stats-exporter.chart" -}} +{{- printf "%s-%s" .Chart.Name .Chart.Version | replace "+" "_" | trunc 63 | trimSuffix "-" }} +{{- end }} + +{{/* +Common labels +*/}} +{{- define "kube-stats-exporter.labels" -}} +helm.sh/chart: {{ include "kube-stats-exporter.chart" . }} +{{ include "kube-stats-exporter.selectorLabels" . }} +{{- if .Chart.AppVersion }} +app.kubernetes.io/version: {{ .Chart.AppVersion | quote }} +{{- end }} +app.kubernetes.io/managed-by: {{ .Release.Service }} +{{- end }} + +{{/* +Selector labels +*/}} +{{- define "kube-stats-exporter.selectorLabels" -}} +app.kubernetes.io/name: {{ include "kube-stats-exporter.name" . }} +app.kubernetes.io/instance: {{ .Release.Name }} +{{- end }} + +{{/* +Create the name of the service account to use +*/}} +{{- define "kube-stats-exporter.serviceAccountName" -}} +{{- if .Values.serviceAccount.create }} +{{- default (include "kube-stats-exporter.fullname" .) .Values.serviceAccount.name }} +{{- else }} +{{- default "default" .Values.serviceAccount.name }} +{{- end }} +{{- end }} + +{{/* +Return the appropriate apiVersion for rbac. +*/}} +{{- define "rbac.apiVersion" -}} +{{- if .Capabilities.APIVersions.Has "rbac.authorization.k8s.io/v1" }} +{{- print "rbac.authorization.k8s.io/v1" -}} +{{- else -}} +{{- print "rbac.authorization.k8s.io/v1beta1" -}} +{{- end -}} +{{- end -}} diff --git a/chart/templates/clusterrole.yaml b/chart/templates/clusterrole.yaml new file mode 100644 index 0000000..125d96f --- /dev/null +++ b/chart/templates/clusterrole.yaml @@ -0,0 +1,17 @@ +apiVersion: {{ template "rbac.apiVersion" . }} +kind: ClusterRole +metadata: + labels: + {{- include "kube-stats-exporter.labels" . | nindent 4 }} + name: {{ include "kube-stats-exporter.fullname" . }} +rules: + - apiGroups: + - "" + resources: + - nodes/metrics + - nodes/stats + - nodes/proxy + - nodes + verbs: + - get + - list diff --git a/chart/templates/deployment.yaml b/chart/templates/deployment.yaml new file mode 100644 index 0000000..d7865c6 --- /dev/null +++ b/chart/templates/deployment.yaml @@ -0,0 +1,45 @@ +apiVersion: apps/v1 +kind: Deployment +metadata: + name: {{ include "kube-stats-exporter.fullname" . }} + labels: + {{- include "kube-stats-exporter.labels" . | nindent 4 }} +spec: + {{- if not .Values.autoscaling.enabled }} + replicas: {{ .Values.replicaCount }} + {{- end }} + selector: + matchLabels: + {{- include "kube-stats-exporter.selectorLabels" . | nindent 6 }} + template: + metadata: + {{- with .Values.podAnnotations }} + annotations: + {{- toYaml . | nindent 8 }} + {{- end }} + labels: + {{- include "kube-stats-exporter.selectorLabels" . | nindent 8 }} + spec: + {{- with .Values.imagePullSecrets }} + imagePullSecrets: + {{- toYaml . | nindent 8 }} + {{- end }} + serviceAccountName: {{ include "kube-stats-exporter.serviceAccountName" . }} + containers: + - name: {{ .Chart.Name }} + image: "{{ .Values.image.repository }}:{{ .Values.image.tag | default .Chart.AppVersion }}" + imagePullPolicy: {{ .Values.image.pullPolicy }} + ports: + - name: http + containerPort: 9100 + protocol: TCP + livenessProbe: + httpGet: + path: /health + port: http + readinessProbe: + httpGet: + path: /health + port: http + resources: + {{- toYaml .Values.resources | nindent 12 }} diff --git a/chart/templates/rolebinding.yaml b/chart/templates/rolebinding.yaml new file mode 100644 index 0000000..fdcb470 --- /dev/null +++ b/chart/templates/rolebinding.yaml @@ -0,0 +1,14 @@ +apiVersion: {{ template "rbac.apiVersion" . }} +kind: ClusterRoleBinding +metadata: + name: {{ include "kube-stats-exporter.fullname" . }} + labels: + {{- include "kube-stats-exporter.labels" . | nindent 4 }} +roleRef: + apiGroup: rbac.authorization.k8s.io + kind: ClusterRole + name: {{ template "kube-stats-exporter.fullname" . }} +subjects: + - kind: ServiceAccount + name: {{ template "kube-stats-exporter.serviceAccountName" . }} + namespace: {{ $.Release.Namespace }} diff --git a/chart/templates/service.yaml b/chart/templates/service.yaml new file mode 100644 index 0000000..5cc4a68 --- /dev/null +++ b/chart/templates/service.yaml @@ -0,0 +1,16 @@ +apiVersion: v1 +kind: Service +metadata: + name: {{ include "kube-stats-exporter.fullname" . }} + labels: + {{- include "kube-stats-exporter.labels" . | nindent 4 }} +spec: + type: {{ .Values.service.type }} + ports: + - port: {{ .Values.service.port }} + targetPort: http + protocol: TCP + name: metrics + selector: + app.kubernetes.io/name: kube-stats-exporter + {{- include "kube-stats-exporter.selectorLabels" . | nindent 4 }} diff --git a/chart/templates/serviceaccount.yaml b/chart/templates/serviceaccount.yaml new file mode 100644 index 0000000..4c68236 --- /dev/null +++ b/chart/templates/serviceaccount.yaml @@ -0,0 +1,12 @@ +{{- if .Values.serviceAccount.create -}} +apiVersion: v1 +kind: ServiceAccount +metadata: + name: {{ include "kube-stats-exporter.serviceAccountName" . }} + labels: + {{- include "kube-stats-exporter.labels" . | nindent 4 }} + {{- with .Values.serviceAccount.annotations }} + annotations: + {{- toYaml . | nindent 4 }} + {{- end }} +{{- end }} diff --git a/chart/templates/servicemonitor.yaml b/chart/templates/servicemonitor.yaml new file mode 100644 index 0000000..562c412 --- /dev/null +++ b/chart/templates/servicemonitor.yaml @@ -0,0 +1,27 @@ +{{- if .Values.serviceMonitor.enabled }} +--- +apiVersion: monitoring.coreos.com/v1 +kind: ServiceMonitor +metadata: + name: {{ template "kube-stats-exporter.fullname" $ }} + labels: + {{- include "kube-stats-exporter.labels" . | nindent 4 }} + {{- if or .Values.serviceMonitor.labels .labels }} + {{- toYaml .Values.serviceMonitor.labels | nindent 4 }} + {{- end }} +spec: + endpoints: + - port: metrics + interval: {{ .Values.serviceMonitor.interval }} + scrapeTimeout: {{ .Values.serviceMonitor.scrapeTimeout }} + honorLabels: true + path: /metrics + jobLabel: "{{ .Release.Name }}" + selector: + matchLabels: + app.kubernetes.io/name: {{ include "kube-stats-exporter.name" $ }} + app.kubernetes.io/instance: {{ .Release.Name }} + namespaceSelector: + matchNames: + - {{ .Release.Namespace }} +{{- end }} diff --git a/chart/templates/tests/test-connection.yaml b/chart/templates/tests/test-connection.yaml new file mode 100644 index 0000000..d4b5aa7 --- /dev/null +++ b/chart/templates/tests/test-connection.yaml @@ -0,0 +1,15 @@ +apiVersion: v1 +kind: Pod +metadata: + name: "{{ include "kube-stats-exporter.fullname" . }}-test-connection" + labels: + {{- include "kube-stats-exporter.labels" . | nindent 4 }} + annotations: + "helm.sh/hook": test +spec: + containers: + - name: wget + image: busybox + command: ['wget'] + args: ['{{ include "kube-stats-exporter.fullname" . }}:{{ .Values.service.port }}'] + restartPolicy: Never diff --git a/chart/values.yaml b/chart/values.yaml new file mode 100644 index 0000000..f3a0343 --- /dev/null +++ b/chart/values.yaml @@ -0,0 +1,55 @@ +--- +namespace: kube-stats-exporter + +env: + API_HOST: kubernetes.default.svc + +replicaCount: 1 + +image: + repository: ghcr.io/phenomenes/kube-stats-exporter + pullPolicy: Always + tag: 0.1.0 + +imagePullSecrets: [] +nameOverride: '' +fullnameOverride: '' + +serviceAccount: + # Specifies whether a service account should be created + create: true + # Annotations to add to the service account + annotations: {} + # The name of the service account to use. + # If not set and create is true, a name is generated using the fullname template + name: kube-stats-exporter + +podAnnotations: {} + +service: + type: ClusterIP + port: 9100 + +resources: + limits: + cpu: 50m + memory: 150Mi + requests: + cpu: 10m + memory: 50Mi + +autoscaling: + enabled: false + +serviceMonitor: + enabled: true + additionalMetricsRelabels: {} + labels: {} + interval: 30s + scrapeTimeout: 30s + +nodeSelector: {} + +tolerations: [] + +affinity: {} diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..8321063 --- /dev/null +++ b/src/main.rs @@ -0,0 +1,317 @@ +use anyhow::Result; +use hyper::{ + body, + http::{header, Method, StatusCode}, + server::conn::http1, + service::service_fn, + Request, Response, +}; +use hyper_util::rt::TokioIo; +use k8s_openapi::api::core::v1::Node; +use kube::{ + api::{Api, ListParams}, + Client, +}; +use log::{error, info}; +use prometheus_client::{ + encoding::text::encode, encoding::EncodeLabelSet, metrics::family::Family, + metrics::gauge::Gauge, registry::Registry, +}; +use reqwest::header::AUTHORIZATION; +use serde::Deserialize; +use std::{env, fs, io::Read, path::Path}; +use tokio::net::TcpListener; +use url::Url; + +const SERVICE_ACCOUNT_TOKEN: &str = "/var/run/secrets/kubernetes.io/serviceaccount/token"; +const CLIENT_CERT_BUNDLE: &str = "/var/run/secrets/kubernetes.io/serviceaccount/ca.crt"; + +// NodeStat represents stats for a single node. It holds the deserialized +// JSON response from the Kubernetes API +#[derive(Deserialize, Debug)] +struct NodeStat { + #[serde(skip)] + node_name: String, + pods: Vec, +} + +// Pod represents a single pod. It holds the pod's metadata and ephemeral +// storage stats +#[derive(Deserialize, Debug)] +struct Pod { + #[serde(rename = "podRef")] + pod_ref: PodRef, + #[serde(rename = "ephemeral-storage")] + ephemeral_storage: EphemeralStorage, +} + +#[derive(Deserialize, Debug)] +struct PodRef { + name: String, + namespace: String, + uid: String, +} + +#[derive(Deserialize, Debug)] +struct EphemeralStorage { + #[serde(rename = "availableBytes")] + available_bytes: i64, + #[serde(rename = "capacityBytes")] + capacity_bytes: i64, + #[serde(default, rename = "usedBytes")] + used_bytes: i64, +} + +#[derive(Default)] +struct EphemeralStorageMetrics { + available_bytes: Family, + capacity_bytes: Family, + used_bytes: Family, +} + +// EphemeralStorage metrics label set +#[derive(Clone, Debug, Default, Hash, PartialEq, Eq, EncodeLabelSet)] +struct EphemeralStorageLabels { + pod: String, + namespace: String, + node: String, + uid: String, +} + +#[derive(Default)] +struct BuildInfoMetrics { + build_info: Family, +} + +// BuildInfoMetrics metric label set +#[derive(Clone, Debug, Default, Hash, PartialEq, Eq, EncodeLabelSet)] +struct BuildInfoLabels { + version: String, + revision: String, +} + +impl EphemeralStorageMetrics { + fn register(&mut self, registry: &mut Registry) { + registry.register( + "kube_pod_ephemeral_storage_available_bytes", + "Pod ephemeral storage available bytes", + self.available_bytes.clone(), + ); + registry.register( + "kube_pod_ephemeral_storage_capacity_bytes", + "Pod ephemeral storage capacity bytes", + self.capacity_bytes.clone(), + ); + registry.register( + "kube_pod_ephemeral_storage_used_bytes", + "Pod ephemeral storage used bytes", + self.used_bytes.clone(), + ); + } +} + +impl BuildInfoMetrics { + fn register(&mut self, registry: &mut Registry) { + registry.register( + "kube_stats_exporter_build_info", + "kube-stats-exporter build info", + self.build_info.clone(), + ); + } +} + +// This function sends a request to the Kubernetes API and to get the node +// stats and returns the ephemeral storage +async fn get_stats() -> Result { + // create a Client to connect to the Kubernetes cluster + let client = Client::try_default().await?; + let nodes: kube::Api = Api::all(client); + + let mut registry = Registry::default(); + let mut storage_metrics = EphemeralStorageMetrics::default(); + storage_metrics.register(&mut registry); + + let mut info_metrics = BuildInfoMetrics::default(); + info_metrics.register(&mut registry); + + info_metrics + .build_info + .get_or_create(&BuildInfoLabels { + version: env!("CARGO_PKG_VERSION").to_string(), + revision: env!("GIT_HASH").to_string(), + }) + .set(1); + + let mut tasks = vec![]; + + // iterate over the nodes and get the stats + for node in nodes.list(&ListParams::default().labels("")).await? { + let node_name = if node + .status + .unwrap() + .conditions + .unwrap() + .into_iter() + // we only want metrics from nodes that are in "Ready" state + .any(|c| c.status == "True" && c.type_ == "Ready") + { + //let node_name = "ip-11-101-87-205.eu-west-2.compute.internal".to_string(); + node.metadata.name.unwrap() + } else { + continue; + }; + + // spawn returns a JoinHandler + tasks.push(tokio::spawn(async move { + get_node_stats(node_name.clone()).await + })); + } + + for task in tasks { + let stats = match task.await.unwrap() { + Ok(stats) => stats, + Err(err) => { + error!("{}", err); + continue; + } + }; + + // populate the Labels + for pod in stats.pods.into_iter() { + storage_metrics + .used_bytes + .get_or_create(&EphemeralStorageLabels { + pod: pod.pod_ref.name.clone(), + namespace: pod.pod_ref.namespace.clone(), + node: stats.node_name.clone(), + uid: pod.pod_ref.uid.clone(), + }) + .set(pod.ephemeral_storage.used_bytes); + storage_metrics + .available_bytes + .get_or_create(&EphemeralStorageLabels { + pod: pod.pod_ref.name.clone(), + namespace: pod.pod_ref.namespace.clone(), + node: stats.node_name.clone(), + uid: pod.pod_ref.uid.clone(), + }) + .set(pod.ephemeral_storage.available_bytes); + storage_metrics + .capacity_bytes + .get_or_create(&EphemeralStorageLabels { + pod: pod.pod_ref.name, + namespace: pod.pod_ref.namespace, + node: stats.node_name.clone(), + uid: pod.pod_ref.uid, + }) + .set(pod.ephemeral_storage.capacity_bytes); + } + } + + let mut buffer = String::new(); + encode(&mut buffer, ®istry)?; + + Ok(buffer) +} + +async fn get_node_stats(node_name: String) -> Result { + let auth_header = if Path::new(SERVICE_ACCOUNT_TOKEN).exists() { + format!("Bearer {}", fs::read_to_string(SERVICE_ACCOUNT_TOKEN)?) + } else { + "".to_string() + }; + let mut api_url = Url::parse( + env::var("API_HOST") + .unwrap_or_else(|_| "https://kubernetes.default.svc".to_string()) + .as_str(), + )?; + api_url.set_path(format!("/api/v1/nodes/{}/proxy/stats/summary", node_name,).as_str()); + + // if there is a certificate, use it on the client connection + let client = if Path::new(CLIENT_CERT_BUNDLE).exists() { + let mut buf = Vec::new(); + fs::File::open(CLIENT_CERT_BUNDLE)?.read_to_end(&mut buf)?; + let cert = reqwest::Certificate::from_pem(&buf).unwrap(); + reqwest::Client::builder() + .add_root_certificate(cert) + .build() + .unwrap() + } else { + reqwest::Client::new() + }; + + let response = client + .get(api_url) + .header(AUTHORIZATION, &auth_header) + .send() + .await?; + + info!("fetching stats from {}", node_name); + + if !response.status().is_success() { + error!("request fail with status {}", response.status()); + }; + + let body = response.text().await?; + let mut stats: NodeStat = serde_json::from_str(&body)?; + // TODO: do this properly. + stats.node_name = node_name; + + Ok(stats) +} + +async fn handler(req: Request) -> Result, hyper::http::Error> { + match (req.method(), req.uri().path()) { + (&Method::GET, "/metrics") => match get_stats().await { + Ok(body) => Response::builder() + .status(StatusCode::OK) + .header( + header::CONTENT_TYPE, + "application/openmetrics-text; version=1.0.0; charset=utf-8", + ) + .body(body), + Err(err) => { + error!("failed to reach remote server: [{}]", err.to_string()); + Response::builder() + .status(StatusCode::BAD_GATEWAY) + .body("Bad gateway".to_string()) + } + }, + (&Method::GET, "/health") => Response::builder() + .status(StatusCode::OK) + .body("ok".to_string()), + _ => Response::builder() + .status(StatusCode::NOT_FOUND) + .body("Not found".to_string()), + } +} + +#[tokio::main] +async fn main() -> Result<()> { + std::env::set_var("RUST_LOG", option_env!("LOG_LEVEL").unwrap_or("info")); + env_logger::init(); + + info!( + "Starting kube-stats-exporter version={} revision={}", + env!("CARGO_PKG_VERSION"), + env!("GIT_HASH") + ); + + let addr = "0.0.0.0:9100"; + info!("Listening on http://{}", addr); + + let listener = TcpListener::bind(addr).await?; + loop { + let (stream, _) = listener.accept().await?; + let io = TokioIo::new(stream); + + tokio::task::spawn(async move { + if let Err(err) = http1::Builder::new() + .serve_connection(io, service_fn(handler)) + .await + { + eprintln!("Server error: {}", err); + } + }); + } +}