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[BAEL-4863] Article Code (#10656) 

* [BAEL-4863] Inicial code

* [BAEL-4863] Article code
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psevestre 2021-04-14 18:35:32 -03:00 committed by GitHub
parent 73d1e79f8f
commit 42e793aa7f
6 changed files with 300 additions and 0 deletions
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72
kubernetes/k8s-intro/src/main/java/com/baeldung/kubernetes/intro/WatchPods.java Normal file
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package com.baeldung.kubernetes.intro;
import java.util.concurrent.TimeUnit;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.gson.reflect.TypeToken;
import io.kubernetes.client.openapi.ApiClient;
import io.kubernetes.client.openapi.ApiException;
import io.kubernetes.client.openapi.apis.CoreV1Api;
import io.kubernetes.client.openapi.models.V1ObjectMeta;
import io.kubernetes.client.openapi.models.V1Pod;
import io.kubernetes.client.util.Config;
import io.kubernetes.client.util.Watch;
import io.kubernetes.client.util.Watch.Response;
import okhttp3.OkHttpClient;
import okhttp3.logging.HttpLoggingInterceptor;
public class WatchPods {
private static Logger log = LoggerFactory.getLogger(WatchPods.class);
public static void main(String[] args) throws Exception {
ApiClient client = Config.defaultClient();
// Optional, put helpful during tests: disable client timeout and enable
// HTTP wire-level logs
HttpLoggingInterceptor interceptor = new HttpLoggingInterceptor(message -> log.info(message));
interceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
OkHttpClient newClient = client.getHttpClient()
.newBuilder()
.addInterceptor(interceptor)
.readTimeout(0, TimeUnit.SECONDS)
.build();
client.setHttpClient(newClient);
CoreV1Api api = new CoreV1Api(client);
// Create the watch object that monitors pod creation/deletion/update events
while (true) {
log.info("[I46] Creating watch...");
try (Watch<V1Pod> watch = Watch.createWatch(
client,
api.listPodForAllNamespacesCall(false, null, null, null, null, "false", null, null, 10, true, null),
new TypeToken<Response<V1Pod>>(){}.getType())) {
log.info("[I52] Receiving events:");
for (Response<V1Pod> event : watch) {
V1Pod pod = event.object;
V1ObjectMeta meta = pod.getMetadata();
switch (event.type) {
case "ADDED":
case "MODIFIED":
case "DELETED":
log.info("event.type: {}, namespace={}, name={}",
event.type,
meta.getNamespace(),
meta.getName());
break;
default:
log.warn("[W66] Unknown event type: {}", event.type);
}
}
} catch (ApiException ex) {
log.error("[E70] ApiError", ex);
}
}
}
}

87
kubernetes/k8s-intro/src/main/java/com/baeldung/kubernetes/intro/WatchPodsUsingBookmarks.java Normal file
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package com.baeldung.kubernetes.intro;
import java.util.concurrent.TimeUnit;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.gson.reflect.TypeToken;
import io.kubernetes.client.openapi.ApiClient;
import io.kubernetes.client.openapi.ApiException;
import io.kubernetes.client.openapi.apis.CoreV1Api;
import io.kubernetes.client.openapi.models.V1ObjectMeta;
import io.kubernetes.client.openapi.models.V1Pod;
import io.kubernetes.client.openapi.models.V1PodList;
import io.kubernetes.client.util.Config;
import io.kubernetes.client.util.Watch;
import io.kubernetes.client.util.Watch.Response;
import okhttp3.OkHttpClient;
import okhttp3.logging.HttpLoggingInterceptor;
public class WatchPodsUsingBookmarks {
private static Logger log = LoggerFactory.getLogger(WatchPodsUsingBookmarks.class);
public static void main(String[] args) throws Exception {
ApiClient client = Config.defaultClient();
// Optional, put helpful during tests: disable client timeout and enable
// HTTP wire-level logs
HttpLoggingInterceptor interceptor = new HttpLoggingInterceptor(message -> log.info(message));
interceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
OkHttpClient newClient = client.getHttpClient()
.newBuilder()
.addInterceptor(interceptor)
.readTimeout(0, TimeUnit.SECONDS)
.build();
client.setHttpClient(newClient);
CoreV1Api api = new CoreV1Api(client);
String resourceVersion = null;
while (true) {
// Get a fresh list only we need to resync
if ( resourceVersion == null ) {
log.info("[I48] Creating initial POD list...");
V1PodList podList = api.listPodForAllNamespaces(true, null, null, null, null, "false", resourceVersion, null, null, null);
resourceVersion = podList.getMetadata().getResourceVersion();
}
while (true) {
log.info("[I54] Creating watch: resourceVersion={}", resourceVersion);
try (Watch<V1Pod> watch = Watch.createWatch(
client,
api.listPodForAllNamespacesCall(true, null, null, null, null, "false", resourceVersion, null, 10, true, null),
new TypeToken<Response<V1Pod>>(){}.getType())) {
log.info("[I60] Receiving events:");
for (Response<V1Pod> event : watch) {
V1Pod pod = event.object;
V1ObjectMeta meta = pod.getMetadata();
switch (event.type) {
case "BOOKMARK":
resourceVersion = meta.getResourceVersion();
log.info("[I67] event.type: {}, resourceVersion={}", event.type,resourceVersion);
break;
case "ADDED":
case "MODIFIED":
case "DELETED":
log.info("event.type: {}, namespace={}, name={}",
event.type,
meta.getNamespace(),
meta.getName());
break;
default:
log.warn("[W76] Unknown event type: {}", event.type);
}
}
} catch (ApiException ex) {
log.error("[E80] ApiError", ex);
resourceVersion = null;
}
}
}
}
}

111
kubernetes/k8s-intro/src/main/java/com/baeldung/kubernetes/intro/WatchPodsUsingResourceVersions.java Normal file
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package com.baeldung.kubernetes.intro;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;
import io.kubernetes.client.openapi.ApiClient;
import io.kubernetes.client.openapi.ApiException;
import io.kubernetes.client.openapi.apis.CoreV1Api;
import io.kubernetes.client.openapi.models.V1ObjectMeta;
import io.kubernetes.client.openapi.models.V1Pod;
import io.kubernetes.client.openapi.models.V1PodList;
import io.kubernetes.client.util.Config;
import io.kubernetes.client.util.Watch;
import io.kubernetes.client.util.Watch.Response;
import okhttp3.OkHttpClient;
import okhttp3.logging.HttpLoggingInterceptor;
public class WatchPodsUsingResourceVersions {
private static Logger log = LoggerFactory.getLogger(WatchPodsUsingResourceVersions.class);
public static void main(String[] args) throws Exception {
ApiClient client = Config.defaultClient();
// Optional, put helpful during tests: disable client timeout and enable
// HTTP wire-level logs
HttpLoggingInterceptor interceptor = new HttpLoggingInterceptor(message -> log.info(message));
interceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
OkHttpClient newClient = client.getHttpClient()
.newBuilder()
.addInterceptor(interceptor)
.readTimeout(0, TimeUnit.SECONDS)
.build();
client.setHttpClient(newClient);
CoreV1Api api = new CoreV1Api(client);
String resourceVersion = null;
while (true) {
try {
if ( resourceVersion == null ) {
V1PodList podList = api.listPodForAllNamespaces(null, null, null, null, null, null, resourceVersion, null, null, null);
resourceVersion = podList.getMetadata().getResourceVersion();
}
log.info("[I59] Creating watch: resourceVersion={}", resourceVersion);
try (Watch<V1Pod> watch = Watch.createWatch(
client,
api.listPodForAllNamespacesCall(null, null, null, null, null, null, resourceVersion, null, 60, true, null),
new TypeToken<Response<V1Pod>>(){}.getType())) {
log.info("[I65] Receiving events:");
for (Response<V1Pod> event : watch) {
V1Pod pod = event.object;
V1ObjectMeta meta = pod.getMetadata();
switch (event.type) {
case "ADDED":
case "MODIFIED":
case "DELETED":
log.info("event: type={}, namespace={}, name={}",
event.type,
meta.getNamespace(),
meta.getName());
break;
default:
log.warn("[W76] Unknown event type: {}", event.type);
}
}
}
}
catch (ApiException ex) {
if ( ex.getCode() == 504 || ex.getCode() == 410 ) {
resourceVersion = extractResourceVersionFromException(ex);
}
else {
// Reset resource version
resourceVersion = null;
}
}
}
}
private static String extractResourceVersionFromException(ApiException ex) {
String body = ex.getResponseBody();
if (body == null) {
return null;
}
Gson gson = new Gson();
Map<?,?> st = gson.fromJson(body, Map.class);
Pattern p = Pattern.compile("Timeout: Too large resource version: (\\d+), current: (\\d+)");
String msg = (String)st.get("message");
Matcher m = p.matcher(msg);
if (!m.matches()) {
return null;
}
return m.group(2);
}
}

10
kubernetes/k8s-intro/src/test/java/com/baeldung/kubernetes/intro/WatchPodsLiveTest.java Normal file
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package com.baeldung.kubernetes.intro;
import org.junit.jupiter.api.Test;
class WatchPodsLiveTest {
@Test
void whenWatchPods_thenSuccess() throws Exception {
WatchPods.main(new String[] {});
}
}

10
kubernetes/k8s-intro/src/test/java/com/baeldung/kubernetes/intro/WatchPodsUsingBookmarksLiveTest.java Normal file
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package com.baeldung.kubernetes.intro;
import org.junit.jupiter.api.Test;
class WatchPodsUsingBookmarksLiveTest {
@Test
void whenWatchPods_thenSuccess() throws Exception {
WatchPodsUsingBookmarks.main(new String[] {});
}
}

10
kubernetes/k8s-intro/src/test/java/com/baeldung/kubernetes/intro/WatchPodsUsingResourceVersionsLiveTest.java Normal file
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package com.baeldung.kubernetes.intro;
import org.junit.jupiter.api.Test;
class WatchPodsUsingResourceVersionsLiveTest {
@Test
void whenWatchPods_thenSuccess() throws Exception {
WatchPodsUsingResourceVersions.main(new String[] {});
}
}