Implement web broker provider and a sample provider in Rust

2017-12-22 17:10:14 -08:00
parent e050fea889
commit a4e99c2133
18 changed files with 1679 additions and 10 deletions
--- a/providers/web/broker.go
+++ b/providers/web/broker.go
@@ -0,0 +1,277 @@
+// Package web provides an implementation of the virtual kubelet provider interface
+// by forwarding all calls to a web endpoint. The web endpoint to which requests
+// must be forwarded must be specified through an environment variable called
+// `WEB_ENDPOINT_URL`. This endpoint must implement the following HTTP APIs:
+//  - POST /createPod
+//  - PUT /updatePod
+//  - DELETE /deletePod
+//  - GET /getPod?namespace=[namespace]&name=[pod name]
+//  - GE /getContainerLogs?namespace=[namespace]&podName=[pod name]&containerName=[container name]&tail=[tail value]
+//  - GET /getPodStatus?namespace=[namespace]&name=[pod name]
+//  - GET /getPods
+//  - GET /capacity
+//  - GET /nodeConditions
+//  - GET /nodeAddresses
+package web
+
+import (
+	"bytes"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"net/http"
+	"net/url"
+	"os"
+	"time"
+
+	"github.com/cenkalti/backoff"
+	"k8s.io/api/core/v1"
+)
+
+// BrokerProvider implements the virtual-kubelet provider interface by forwarding kubelet calls to a web endpoint.
+type BrokerProvider struct {
+	nodeName           string
+	operatingSystem    string
+	endpoint           *url.URL
+	client             *http.Client
+	daemonEndpointPort int32
+}
+
+// NewBrokerProvider creates a new BrokerProvider
+func NewBrokerProvider(nodeName, operatingSystem string, daemonEndpointPort int32) (*BrokerProvider, error) {
+	var provider BrokerProvider
+
+	provider.nodeName = nodeName
+	provider.operatingSystem = operatingSystem
+	provider.client = &http.Client{}
+	provider.daemonEndpointPort = daemonEndpointPort
+
+	if ep := os.Getenv("WEB_ENDPOINT_URL"); ep != "" {
+		epurl, err := url.Parse(ep)
+		if err != nil {
+			return nil, err
+		}
+		provider.endpoint = epurl
+	}
+
+	return &provider, nil
+}
+
+// CreatePod accepts a Pod definition and forwards the call to the web endpoint
+func (p *BrokerProvider) CreatePod(pod *v1.Pod) error {
+	return p.createUpdatePod(pod, "POST", "/createPod")
+}
+
+// UpdatePod accepts a Pod definition and forwards the call to the web endpoint
+func (p *BrokerProvider) UpdatePod(pod *v1.Pod) error {
+	return p.createUpdatePod(pod, "PUT", "/updatePod")
+}
+
+// DeletePod accepts a Pod definition and forwards the call to the web endpoint
+func (p *BrokerProvider) DeletePod(pod *v1.Pod) error {
+	urlPath, err := url.Parse("/deletePod")
+	if err != nil {
+		return err
+	}
+
+	// encode pod definition as JSON and post request
+	podJSON, err := json.Marshal(pod)
+	if err != nil {
+		return err
+	}
+
+	_, err = p.doRequest("DELETE", urlPath, podJSON, false)
+	return err
+}
+
+// GetPod returns a pod by name that is being managed by the web server
+func (p *BrokerProvider) GetPod(namespace, name string) (*v1.Pod, error) {
+	urlPathStr := fmt.Sprintf(
+		"/getPod?namespace=%s&name=%s",
+		url.QueryEscape(namespace),
+		url.QueryEscape(name))
+
+	var pod v1.Pod
+	err := p.doGetRequest(urlPathStr, &pod)
+
+	// if we get a "404 Not Found" then we return nil to indicate that no pod
+	// with this name was found
+	if err != nil && err.Error() == "404 Not Found" {
+		return nil, nil
+	}
+
+	return &pod, err
+}
+
+// GetContainerLogs returns the logs of a container running in a pod by name.
+func (p *BrokerProvider) GetContainerLogs(namespace, podName, containerName string, tail int) (string, error) {
+	urlPathStr := fmt.Sprintf(
+		"/getContainerLogs?namespace=%s&podName=%s&containerName=%s&tail=%d",
+		url.QueryEscape(namespace),
+		url.QueryEscape(podName),
+		url.QueryEscape(containerName),
+		tail)
+
+	response, err := p.doGetRequestBytes(urlPathStr)
+	if err != nil {
+		return "", err
+	}
+
+	return string(response), nil
+}
+
+// GetPodStatus retrieves the status of a given pod by name.
+func (p *BrokerProvider) GetPodStatus(namespace, name string) (*v1.PodStatus, error) {
+	urlPathStr := fmt.Sprintf(
+		"/getPodStatus?namespace=%s&name=%s",
+		url.QueryEscape(namespace),
+		url.QueryEscape(name))
+
+	var podStatus v1.PodStatus
+	err := p.doGetRequest(urlPathStr, &podStatus)
+
+	// if we get a "404 Not Found" then we return nil to indicate that no pod
+	// with this name was found
+	if err != nil && err.Error() == "404 Not Found" {
+		return nil, nil
+	}
+
+	return &podStatus, err
+}
+
+// GetPods retrieves a list of all pods scheduled to run.
+func (p *BrokerProvider) GetPods() ([]*v1.Pod, error) {
+	var pods []*v1.Pod
+	err := p.doGetRequest("/getPods", &pods)
+
+	return pods, err
+}
+
+// Capacity returns a resource list containing the capacity limits
+func (p *BrokerProvider) Capacity() v1.ResourceList {
+	var resourceList v1.ResourceList
+	err := p.doGetRequest("/capacity", &resourceList)
+
+	// TODO: This API should support reporting an error.
+	if err != nil {
+		panic(err)
+	}
+
+	return resourceList
+}
+
+// NodeConditions returns a list of conditions (Ready, OutOfDisk, etc), for updates to the node status
+func (p *BrokerProvider) NodeConditions() []v1.NodeCondition {
+	var nodeConditions []v1.NodeCondition
+	err := p.doGetRequest("/nodeConditions", &nodeConditions)
+
+	// TODO: This API should support reporting an error.
+	if err != nil {
+		panic(err)
+	}
+
+	return nodeConditions
+}
+
+// NodeAddresses returns a list of addresses for the node status
+// within Kuberentes.
+func (p *BrokerProvider) NodeAddresses() []v1.NodeAddress {
+	var nodeAddresses []v1.NodeAddress
+	err := p.doGetRequest("/nodeAddresses", &nodeAddresses)
+
+	// TODO: This API should support reporting an error.
+	if err != nil {
+		panic(err)
+	}
+
+	return nodeAddresses
+}
+
+// NodeDaemonEndpoints returns NodeDaemonEndpoints for the node status
+// within Kuberentes.
+func (p *BrokerProvider) NodeDaemonEndpoints() *v1.NodeDaemonEndpoints {
+	return &v1.NodeDaemonEndpoints{
+		KubeletEndpoint: v1.DaemonEndpoint{
+			Port: p.daemonEndpointPort,
+		},
+	}
+}
+
+// OperatingSystem returns the operating system for this provider.
+func (p *BrokerProvider) OperatingSystem() string {
+	return p.operatingSystem
+}
+
+func (p *BrokerProvider) doGetRequest(urlPathStr string, v interface{}) error {
+	response, err := p.doGetRequestBytes(urlPathStr)
+	if err != nil {
+		return err
+	}
+
+	return json.Unmarshal(response, &v)
+}
+
+func (p *BrokerProvider) doGetRequestBytes(urlPathStr string) ([]byte, error) {
+	urlPath, err := url.Parse(urlPathStr)
+	if err != nil {
+		return nil, err
+	}
+
+	return p.doRequest("GET", urlPath, nil, true)
+}
+
+func (p *BrokerProvider) createUpdatePod(pod *v1.Pod, method, postPath string) error {
+	// build the post url
+	postPathURL, err := url.Parse(postPath)
+	if err != nil {
+		return err
+	}
+
+	// encode pod definition as JSON and post request
+	podJSON, err := json.Marshal(pod)
+	if err != nil {
+		return err
+	}
+	_, err = p.doRequest(method, postPathURL, podJSON, false)
+	return err
+}
+
+func (p *BrokerProvider) doRequest(method string, urlPath *url.URL, body []byte, readResponse bool) ([]byte, error) {
+	// build full URL
+	requestURL := p.endpoint.ResolveReference(urlPath)
+
+	// build the request
+	var bodyReader io.Reader
+	if body != nil {
+		bodyReader = bytes.NewReader(body)
+	}
+	request, err := http.NewRequest(method, requestURL.String(), bodyReader)
+	request.Header.Add("Content-Type", "application/json")
+
+	// issue request
+	retry := backoff.NewExponentialBackOff()
+	retry.MaxElapsedTime = 5 * time.Minute
+
+	var response *http.Response
+	err = backoff.Retry(func() error {
+		response, err = p.client.Do(request)
+		return err
+	}, retry)
+	if err != nil {
+		return nil, err
+	}
+
+	defer response.Body.Close()
+	if response.StatusCode < 200 || response.StatusCode > 299 {
+		return nil, errors.New(response.Status)
+	}
+
+	// read response body if asked to
+	if readResponse {
+		return ioutil.ReadAll(response.Body)
+	}
+
+	return nil, nil
+}
--- a/providers/web/charts/virtual-kubelet-web/.helmignore
+++ b/providers/web/charts/virtual-kubelet-web/.helmignore
@@ -0,0 +1,21 @@
+# 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
+*~
+# Various IDEs
+.project
+.idea/
+*.tmproj
--- a/providers/web/charts/virtual-kubelet-web/Chart.yaml
+++ b/providers/web/charts/virtual-kubelet-web/Chart.yaml
@@ -0,0 +1,4 @@
+name: virtual-kubelet-web
+version: 0.1.0
+description: a Helm chart to install virtual kubelet in Kubernetes setup with a web provider
+
--- a/providers/web/charts/virtual-kubelet-web/templates/NOTES.txt
+++ b/providers/web/charts/virtual-kubelet-web/templates/NOTES.txt
@@ -0,0 +1,5 @@
+The virtual kubelet is getting deployed on your cluster.
+
+To verify that virtual kubelet has started, run:
+
+  kubectl --namespace={{ .Release.Namespace }} get pods -l "app={{ template "virtual-kubelet-web.fullname" . }}"
--- a/providers/web/charts/virtual-kubelet-web/templates/_helpers.tpl
+++ b/providers/web/charts/virtual-kubelet-web/templates/_helpers.tpl
@@ -0,0 +1,16 @@
+{{/* vim: set filetype=mustache: */}}
+{{/*
+Expand the name of the chart.
+*/}}
+{{- define "virtual-kubelet-web.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).
+*/}}
+{{- define "virtual-kubelet-web.fullname" -}}
+{{- $name := default .Chart.Name .Values.nameOverride -}}
+{{- printf "%s-%s" .Release.Name $name | trunc 63 | trimSuffix "-" -}}
+{{- end -}}
--- a/providers/web/charts/virtual-kubelet-web/templates/deployment.yaml
+++ b/providers/web/charts/virtual-kubelet-web/templates/deployment.yaml
@@ -0,0 +1,42 @@
+apiVersion: extensions/v1beta1
+kind: Deployment
+metadata:
+  name: {{ template "virtual-kubelet-web.fullname" . }}
+  labels:
+    app: {{ template "virtual-kubelet-web.name" . }}
+    chart: {{ .Chart.Name }}-{{ .Chart.Version | replace "+" "_" }}
+    release: {{ .Release.Name }}
+    heritage: {{ .Release.Service }}
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: {{ template "virtual-kubelet-web.name" . }}
+  template:
+    metadata:
+      labels:
+        app: {{ template "virtual-kubelet-web.name" . }}
+        release: {{ .Release.Name }}
+    spec:
+      containers:
+        - name: rustwebprovider
+          image: "{{ .Values.rustwebimage.repository }}:{{ .Values.rustwebimage.tag }}"
+          imagePullPolicy: {{ .Values.rustwebimage.pullPolicy }}
+          ports:
+            - containerPort: {{ .Values.rustwebimage.port }}
+          livenessProbe:
+            httpGet:
+              path: /
+              port: {{ .Values.rustwebimage.port }}
+          readinessProbe:
+            httpGet:
+              path: /
+              port: {{ .Values.rustwebimage.port }}
+        - name: virtualkubelet
+          image: "{{ .Values.vkimage.repository }}:{{ .Values.vkimage.tag }}"
+          imagePullPolicy: {{ .Values.vkimage.pullPolicy }}
+          env:
+            - name: WEB_ENDPOINT_URL
+              value: http://localhost:{{ .Values.rustwebimage.port }}
+          command: ["virtual-kubelet"]
+          args: ["--provider", "web", "--nodename", {{ default "web-provider" .Values.env.nodeName | quote }}]
--- a/providers/web/charts/virtual-kubelet-web/values.yaml
+++ b/providers/web/charts/virtual-kubelet-web/values.yaml
@@ -0,0 +1,11 @@
+rustwebimage:
+  repository: avranju/rust-web-provider
+  tag: latest
+  pullPolicy: Always
+  port: 3000
+vkimage:
+  repository: avranju/virtual-kubelet
+  tag: latest
+  pullPolicy: Always
+env:
+  nodeName: virtual-kubelet-web
--- a/providers/web/rust-web-provider/.gitignore
+++ b/providers/web/rust-web-provider/.gitignore
@@ -0,0 +1,4 @@
+/target/
+**/*.rs.bk
+.idea/
+.vscode/
--- a/providers/web/rust-web-provider/Cargo.lock
+++ b/providers/web/rust-web-provider/Cargo.lock
@@ -0,0 +1,988 @@
+[[package]]
+name = "aho-corasick"
+version = "0.6.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
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+]
+
+[[package]]
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+ "unicase 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
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+]
+
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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+ "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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--- a/providers/web/rust-web-provider/Cargo.toml
+++ b/providers/web/rust-web-provider/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "rust-web-provider"
+version = "0.1.0"
+authors = ["Rajasekharan Vengalil <rajave@microsoft.com>"]
+
+[dependencies]
+kube_rust = { git = "https://github.com/avranju/kube-rust", rev = "058de6366d0d75cb60b2d0fd5ba1abd2e7d83fff" }
+virtual-kubelet-adapter = { git = "https://github.com/avranju/rust-virtual-kubelet-adapter", rev = "4250103d31e2864725e47bdd23295e79ee12b6d0"}
+log = "0.4"
+env_logger = "0.4"
+time = "0.1"
--- a/providers/web/rust-web-provider/Dockerfile
+++ b/providers/web/rust-web-provider/Dockerfile
@@ -0,0 +1,9 @@
+FROM debian:stretch-slim
+
+WORKDIR /app
+ADD ./rust-web-provider /app/rust-web-provider
+
+ENV RUST_LOG=info
+EXPOSE 3000
+
+ENTRYPOINT [ "/app/rust-web-provider" ]
--- a/providers/web/rust-web-provider/scripts/buildDocker.sh
+++ b/providers/web/rust-web-provider/scripts/buildDocker.sh
@@ -0,0 +1,75 @@
+#!/bin/bash
+
+set -e
+
+SCRIPT_NAME=$(basename "$0")
+DIR=$(cd "$(dirname "$0")" && pwd)
+ROOT_FOLDER="$DIR/.."
+PUBLISH_DIR=$ROOT_FOLDER/target/publish
+TARGET_NAME=rust-web-provider
+IMAGE_NAME=rust-web-provider
+IMAGE_VERSION=latest
+BUILD_RELEASE=true
+SOURCE_RELEASE_DIR=$ROOT_FOLDER/target/release
+SOURCE_DEBUG_DIR=$ROOT_FOLDER/target/debug
+SOURCE_DIR=$SOURCE_RELEASE_DIR
+
+usage()
+{
+    echo "$SCRIPT_NAME [options]"
+    echo "Note: You might have to run this as root or sudo."
+    echo ""
+    echo "options"
+    echo " -i, --image-name     Image name (default: rust-web-provider)"
+    echo " -v, --image-version  Docker Image Version (default: latest)"
+    echo " -r, --build-release  Build release configuration - true|false (default: true)"
+    exit 1;
+}
+
+process_args()
+{
+    save_next_arg=0
+    for arg in "$@"
+    do
+        if [ $save_next_arg -eq 1 ]; then
+            IMAGE_NAME="$arg"
+            save_next_arg=0
+        elif [ $save_next_arg -eq 2 ]; then
+            IMAGE_VERSION="$arg"
+            save_next_arg=0
+        elif [ $save_next_arg -eq 3 ]; then
+            BUILD_RELEASE="$arg"
+            save_next_arg=0
+        else
+            case "$arg" in
+                "-h" | "--help" ) usage;;
+                "-i" | "--image-name" ) save_next_arg=1;;
+                "-v" | "--image-version" ) save_next_arg=2;;
+                "-r" | "--build-release" ) save_next_arg=3;;
+                * ) usage;;
+            esac
+        fi
+    done
+}
+
+# process command line args
+process_args "$@"
+
+# build bits
+if [ "$BUILD_RELEASE" == "true" ]; then
+    cargo build --release
+else
+    SOURCE_DIR=$SOURCE_DEBUG_DIR
+    cargo build
+fi
+
+# copy release binary & Dockerfile to a "publish" folder
+rm -rf "$PUBLISH_DIR"
+mkdir -p "$PUBLISH_DIR"
+cp "$ROOT_FOLDER/Dockerfile" "$PUBLISH_DIR"
+cp "$SOURCE_DIR/$TARGET_NAME" "$PUBLISH_DIR"
+
+# build the Docker image
+pushd "$PUBLISH_DIR"
+docker build -t "$IMAGE_NAME":"$IMAGE_VERSION" .
+popd
--- a/providers/web/rust-web-provider/src/main.rs
+++ b/providers/web/rust-web-provider/src/main.rs
@@ -0,0 +1,20 @@
+extern crate env_logger;
+extern crate kube_rust;
+#[macro_use]
+extern crate log;
+extern crate time;
+extern crate virtual_kubelet_adapter;
+
+mod utils;
+mod unit_provider;
+
+use virtual_kubelet_adapter::start_server;
+use unit_provider::UnitProvider;
+
+fn main() {
+  // initialize logger
+  env_logger::init().unwrap();
+
+  let provider = Box::new(UnitProvider::new());
+  start_server(provider).unwrap();
+}
--- a/providers/web/rust-web-provider/src/unit_provider.rs
+++ b/providers/web/rust-web-provider/src/unit_provider.rs
@@ -0,0 +1,156 @@
+use kube_rust::models::{V1NodeAddress, V1NodeCondition, V1NodeDaemonEndpoints, V1Pod, V1PodStatus};
+use virtual_kubelet_adapter::{Error, Provider, Result};
+use std::collections::BTreeMap;
+use utils::Filter;
+use time;
+
+pub struct UnitProvider {
+    pods_map: BTreeMap<String, V1Pod>,
+}
+
+impl UnitProvider {
+    pub fn new() -> UnitProvider {
+        UnitProvider {
+            pods_map: BTreeMap::new(),
+        }
+    }
+
+    fn make_pod_id(&self, pod: &V1Pod) -> String {
+        let empty = String::from("");
+        pod.metadata()
+            .map(|m| m.name().unwrap_or(&empty))
+            .unwrap_or(&empty)
+            .clone()
+    }
+
+    fn pod_name(&mut self, pod: &V1Pod) -> String {
+        let empty = "".to_owned();
+        format!(
+            "{}",
+            pod.metadata()
+                .map(|m| m.name())
+                .and_then(|s| s)
+                .unwrap_or(&empty)
+        )
+    }
+}
+
+impl Provider for UnitProvider {
+    fn create_pod(&mut self, pod: &V1Pod) -> Result<()> {
+        info!("Creating pod: {}", self.pod_name(pod));
+
+        let id = self.make_pod_id(pod);
+        let mut new_pod = pod.clone();
+        new_pod.set_status(
+            pod.status()
+                .map(|s| s.clone())
+                .unwrap_or_else(|| V1PodStatus::new())
+                .with_phase(String::from("Running")),
+        );
+        self.pods_map.insert(id, new_pod);
+        Ok(())
+    }
+
+    fn update_pod(&mut self, pod: &V1Pod) -> Result<()> {
+        info!("Updating pod: {}", self.pod_name(pod));
+
+        // update the pod definition if it exists
+        let id = self.make_pod_id(pod);
+        if self.pods_map.contains_key(&id) {
+            self.pods_map.insert(id, pod.clone());
+        }
+        Ok(())
+    }
+
+    fn delete_pod(&mut self, pod: &V1Pod) -> Result<()> {
+        info!("Deleting pod: {}", self.pod_name(pod));
+
+        let id = self.make_pod_id(pod);
+        self.pods_map.remove(&id);
+        Ok(())
+    }
+
+    fn get_pod(&self, namespace: &str, name: &str) -> Result<V1Pod> {
+        info!("Getting pod: {}", name);
+        self.pods_map
+            .get(name)
+            .filter(|pod| {
+                let empty = String::from("");
+                let ns = pod.metadata()
+                    .map(|m| m.namespace())
+                    .and_then(|n| n)
+                    .unwrap_or(&empty);
+                namespace.len() == 0 || namespace == ns
+            })
+            .map(|pod| pod.clone())
+            .ok_or_else(|| {
+                info!("Could not find pod: {}", name);
+                Error::not_found("Pod not found")
+            })
+    }
+
+    fn get_container_logs(
+        &self,
+        namespace: &str,
+        pod_name: &str,
+        container_name: &str,
+        tail: i32,
+    ) -> Result<String> {
+        Ok(format!(
+            "get_container_logs() - ns: {}, pod_name: {}, container_name: {}, tail: {}",
+            namespace, pod_name, container_name, tail
+        ))
+    }
+
+    fn get_pod_status(&self, _: &str, name: &str) -> Result<V1PodStatus> {
+        info!("Getting pod status: {}", name);
+        self.pods_map
+            .get(name)
+            .map(|pod| pod.status())
+            .and_then(|pod_status| pod_status)
+            .map(|pod_status| pod_status.clone())
+            .ok_or_else(|| {
+                info!("Could not find pod/status: {}", name);
+                Error::not_found("Pod/status not found")
+            })
+    }
+
+    fn get_pods(&self) -> Result<Vec<V1Pod>> {
+        info!("Getting pods");
+        Ok(self.pods_map.values().cloned().collect())
+    }
+
+    fn capacity(&self) -> Result<BTreeMap<String, String>> {
+        info!("Getting capacity");
+        let values = [("cpu", "20"), ("memory", "100Gi"), ("pods", "20")];
+        let mut map = BTreeMap::new();
+        for v in values.iter() {
+            map.insert(v.0.to_string(), v.1.to_string());
+        }
+
+        Ok(map)
+    }
+
+    fn node_conditions(&self) -> Result<Vec<V1NodeCondition>> {
+        info!("Getting node_condition");
+        Ok(vec![
+            V1NodeCondition::new(String::from("True"), String::from("Ready"))
+                .with_reason(String::from("KubeletReady"))
+                .with_message(String::from("Rusty times."))
+                .with_last_heartbeat_time(format!("{}", time::now_utc().rfc3339()))
+                .with_last_transition_time(format!("{}", time::now_utc().rfc3339())),
+        ])
+    }
+
+    fn node_addresses(&self) -> Result<Vec<V1NodeAddress>> {
+        Ok(vec![])
+    }
+
+    fn node_daemon_endpoints(&self) -> Result<V1NodeDaemonEndpoints> {
+        Err(Error::new("Not implemented"))
+    }
+
+    fn operating_system(&self) -> String {
+        String::from("linux")
+    }
+}
--- a/providers/web/rust-web-provider/src/utils.rs
+++ b/providers/web/rust-web-provider/src/utils.rs
@@ -0,0 +1,18 @@
+pub trait Filter<T> {
+    fn filter<P: FnOnce(&T) -> bool>(self, predicate: P) -> Self;
+}
+
+impl<T> Filter<T> for Option<T> {
+    fn filter<P: FnOnce(&T) -> bool>(self, predicate: P) -> Self {
+        match self {
+            Some(x) => {
+                if predicate(&x) {
+                    Some(x)
+                } else {
+                    None
+                }
+            }
+            None => None,
+        }
+    }
+}