From: Kai Moritz <kai@juplo.de>
Date: Sat, 3 Feb 2024 07:29:06 +0000 (+0100)
Subject: test: HandoverIT-POC - first working setup for the planned test
X-Git-Tag: rebase--2024-02-27--11-49~18
X-Git-Url: http://juplo.de/gitweb/?a=commitdiff_plain;h=a219b1ab7a0341b822ba379cadec1b11ba6028c9;p=demos%2Fkafka%2Fchat

test: HandoverIT-POC - first working setup for the planned test

* First working POC of the setup for the planned test.
* This version blocks endlessly, because the SSE-flux never completes.
---

diff --git a/pom.xml b/pom.xml
index e98a75e4..13a0e7c6 100644
--- a/pom.xml
+++ b/pom.xml
@@ -80,6 +80,11 @@
       <artifactId>mongodb</artifactId>
       <scope>test</scope>
     </dependency>
+    <dependency>
+      <groupId>org.testcontainers</groupId>
+      <artifactId>kafka</artifactId>
+      <scope>test</scope>
+    </dependency>
     <dependency>
       <groupId>org.testcontainers</groupId>
       <artifactId>junit-jupiter</artifactId>
diff --git a/src/test/java/de/juplo/kafka/chat/backend/AbstractHandoverIT.java b/src/test/java/de/juplo/kafka/chat/backend/AbstractHandoverIT.java
new file mode 100644
index 00000000..fc54c032
--- /dev/null
+++ b/src/test/java/de/juplo/kafka/chat/backend/AbstractHandoverIT.java
@@ -0,0 +1,147 @@
+package de.juplo.kafka.chat.backend;
+
+import de.juplo.kafka.chat.backend.api.ChatRoomInfoTo;
+import de.juplo.kafka.chat.backend.api.MessageTo;
+import lombok.EqualsAndHashCode;
+import lombok.Getter;
+import lombok.Setter;
+import lombok.ToString;
+import lombok.extern.slf4j.Slf4j;
+import org.junit.jupiter.api.Test;
+import org.springframework.core.ParameterizedTypeReference;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
+import org.springframework.http.codec.ServerSentEvent;
+import org.springframework.web.reactive.function.client.WebClient;
+import org.testcontainers.images.ImagePullPolicy;
+import org.testcontainers.junit.jupiter.Testcontainers;
+import reactor.core.publisher.Flux;
+import reactor.core.publisher.Mono;
+import reactor.util.retry.Retry;
+
+import java.time.Duration;
+import java.util.stream.IntStream;
+
+
+@Testcontainers
+@Slf4j
+public abstract class AbstractHandoverIT
+{
+  static final ImagePullPolicy NEVER_PULL = imageName -> false;
+  static final ParameterizedTypeReference<ServerSentEvent<String>> SSE_TYPE = new ParameterizedTypeReference<>() {};
+
+
+  @Test
+  void test() throws InterruptedException
+  {
+    ChatRoomInfoTo chatRoom = createChatRoom("bar").block();
+    User user = new User("nerd");
+    IntStream
+        .rangeClosed(1,100)
+        .mapToObj(i ->sendMessage(chatRoom, user, "Message #" + i))
+        .map(result -> result
+            .map(MessageTo::toString)
+            .retryWhen(Retry.fixedDelay(10, Duration.ofSeconds(1)))
+            .block())
+        .forEach(result -> log.info("{}", result));
+
+    receiveMessages(chatRoom)
+        .take(100)
+        .doOnNext(message -> log.info("message: {}", message))
+        .then()
+        .block();
+  }
+
+  Mono<ChatRoomInfoTo> createChatRoom(String name)
+  {
+    return webClient
+        .post()
+        .uri("/create")
+        .contentType(MediaType.TEXT_PLAIN)
+        .bodyValue(name)
+        .accept(MediaType.APPLICATION_JSON)
+        .exchangeToMono(response ->
+        {
+          if (response.statusCode().equals(HttpStatus.OK))
+          {
+            return response.bodyToMono(ChatRoomInfoTo.class);
+          }
+          else
+          {
+            return response.createError();
+          }
+        });
+  }
+
+  Mono<MessageTo> sendMessage(
+      ChatRoomInfoTo chatRoom,
+      User user,
+      String message)
+  {
+    return webClient
+        .put()
+        .uri(
+            "/{chatRoomId}/{username}/{serial}",
+            chatRoom.getId(),
+            user.getName(),
+            user.nextSerial())
+        .contentType(MediaType.TEXT_PLAIN)
+        .accept(MediaType.APPLICATION_JSON)
+        .bodyValue(message)
+        .exchangeToMono(response ->
+        {
+          if (response.statusCode().equals(HttpStatus.OK))
+          {
+            return response.bodyToMono(MessageTo.class);
+          }
+          else
+          {
+            return response.createError();
+          }
+        });
+  }
+
+  Flux<ServerSentEvent<String>> receiveMessages(ChatRoomInfoTo chatRoom)
+  {
+    return webClient
+        .get()
+        .uri(
+            "/{chatRoomId}/listen",
+            chatRoom.getId())
+        .accept(MediaType.TEXT_EVENT_STREAM)
+        .retrieve()
+        .bodyToFlux(SSE_TYPE);
+  }
+
+
+  WebClient webClient;
+
+
+  @EqualsAndHashCode
+  @ToString
+  class User
+  {
+    @Getter
+    private final String name;
+    private int serial = 0;
+
+
+    User (String name)
+    {
+      this.name = name;
+    }
+
+
+    int nextSerial()
+    {
+      return ++serial;
+    }
+  }
+
+  @Getter
+  @Setter
+  static class StatusTo
+  {
+    String status;
+  }
+}
diff --git a/src/test/java/de/juplo/kafka/chat/backend/KafkaHandoverIT.java b/src/test/java/de/juplo/kafka/chat/backend/KafkaHandoverIT.java
new file mode 100644
index 00000000..6bf1e9e2
--- /dev/null
+++ b/src/test/java/de/juplo/kafka/chat/backend/KafkaHandoverIT.java
@@ -0,0 +1,209 @@
+package de.juplo.kafka.chat.backend;
+
+import lombok.extern.slf4j.Slf4j;
+import org.awaitility.Awaitility;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.BeforeEach;
+import org.springframework.http.HttpStatus;
+import org.springframework.web.reactive.function.client.WebClient;
+import org.testcontainers.containers.*;
+import org.testcontainers.containers.output.Slf4jLogConsumer;
+import org.testcontainers.containers.wait.strategy.Wait;
+import org.testcontainers.utility.DockerImageName;
+import reactor.core.publisher.Mono;
+
+import java.io.IOException;
+import java.time.Duration;
+
+
+@Slf4j
+class KafkaHandoverIT extends AbstractHandoverIT
+{
+  @BeforeEach
+  void setUpWebClient()
+  {
+    Integer port = HAPROXY.getMappedPort(8400);
+    webClient = WebClient.create("http://localhost:" + port);
+
+    Awaitility
+        .await()
+        .atMost(Duration.ofMinutes(10))
+        .until(() -> WebClient
+            .create("http://localhost:" + BACKEND_1.getMappedPort(8080))
+            .get()
+            .uri("/actuator/health")
+            .exchangeToMono(response ->
+            {
+              if (response.statusCode().equals(HttpStatus.OK))
+              {
+                return response
+                    .bodyToMono(StatusTo.class)
+                    .map(StatusTo::getStatus)
+                    .map(status -> status.equalsIgnoreCase("UP"));
+              }
+              else
+              {
+                return Mono.just(false);
+              }
+            })
+            .block());
+
+    HAPROXY
+        .getDockerClient()
+        .killContainerCmd(HAPROXY.getContainerId())
+        .withSignal("HUP")
+        .exec();
+
+
+    Awaitility
+        .await()
+        .atMost(Duration.ofMinutes(10))
+        .until(() -> webClient
+            .get()
+            .uri("/actuator/health")
+            .exchangeToMono(response ->
+            {
+              if (response.statusCode().equals(HttpStatus.OK))
+              {
+                return response
+                    .bodyToMono(StatusTo.class)
+                    .map(StatusTo::getStatus)
+                    .map(status -> status.equalsIgnoreCase("UP"));
+              }
+              else
+              {
+                return Mono.just(false);
+              }
+            })
+            .block());
+  }
+
+
+  @BeforeAll
+  static void setUpDocker() throws IOException, InterruptedException
+  {
+    KAFKA.start();
+    HAPROXY.start();
+
+    Container.ExecResult result;
+    result = KAFKA.execInContainer(
+        "kafka-topics",
+        "--bootstrap-server",
+        "kafka:9999",
+        "--create",
+        "--topic",
+        "info_channel",
+        "--partitions",
+        "3");
+    log.info(
+        "EXIT-CODE={}, STDOUT={}, STDERR={}",
+        result.getExitCode(),
+        result.getStdout(),
+        result.getStdout());
+    result = KAFKA.execInContainer(
+        "kafka-topics",
+        "--bootstrap-server",
+        "kafka:9999",
+        "--create",
+        "--topic",
+        "data_channel",
+        "--partitions",
+        "10");
+    log.info(
+        "EXIT-CODE={}, STDOUT={}, STDERR={}",
+        result.getExitCode(),
+        result.getStdout(),
+        result.getStdout());
+
+    BACKEND_1.start();
+    // BACKEND_2.start();
+    // BACKEND_3.start();
+  }
+
+  static Network NETWORK = Network.newNetwork();
+
+  static KafkaContainer KAFKA =
+      new KafkaContainer(DockerImageName.parse("confluentinc/cp-kafka:7.4.0"))
+          .withNetwork(NETWORK)
+          .withNetworkAliases("kafka")
+          .withListener(() -> "kafka:9999")
+          .withKraft()
+          .waitingFor(Wait.forLogMessage(".*Kafka\\ Server\\ started.*\\n", 1))
+          .withLogConsumer(new Slf4jLogConsumer(log, true).withPrefix("KAFKA"));
+
+  static GenericContainer BACKEND_1 =
+      new GenericContainer(DockerImageName.parse("juplo/chat-backend:0.0.1-SNAPSHOT"))
+          .withImagePullPolicy(NEVER_PULL)
+          .withNetwork(NETWORK)
+          .withNetworkAliases("backend-1")
+          .withCommand(
+              "--chat.backend.instance-id=backend-1",
+              "--chat.backend.services=kafka",
+              "--chat.backend.kafka.bootstrap-servers=kafka:9999",
+              "--chat.backend.kafka.instance-uri=http://backend-1:8080",
+              "--chat.backend.kafka.num-partitions=10",
+              "--chat.backend.kafka.client-id-prefix=B1",
+              "--chat.backend.kafka.haproxy-runtime-api=haproxy:8401",
+              "--chat.backend.kafka.haproxy-map=/usr/local/etc/haproxy/sharding.map"
+          )
+          .withExposedPorts(8080)
+          .dependsOn(KAFKA)
+          .waitingFor(Wait.forLogMessage(".*Started\\ ChatBackendApplication.*\\n", 1))
+          .withLogConsumer(new Slf4jLogConsumer(log, true).withPrefix("BACKEND-1"));
+
+  static GenericContainer BACKEND_2 =
+      new GenericContainer(DockerImageName.parse("juplo/chat-backend:0.0.1-SNAPSHOT"))
+          .withImagePullPolicy(NEVER_PULL)
+          .withNetwork(NETWORK)
+          .withNetworkAliases("backend-2")
+          .withCommand(
+              "--chat.backend.instance-id=backend-2",
+              "--chat.backend.services=kafka",
+              "--chat.backend.kafka.bootstrap-servers=kafka:9999",
+              "--chat.backend.kafka.instance-uri=http://backend-2:8080",
+              "--chat.backend.kafka.num-partitions=10",
+              "--chat.backend.kafka.client-id-prefix=B2",
+              "--chat.backend.kafka.haproxy-runtime-api=haproxy:8401",
+              "--chat.backend.kafka.haproxy-map=/usr/local/etc/haproxy/sharding.map"
+          )
+          .withExposedPorts(8080)
+          .dependsOn(KAFKA)
+          .waitingFor(Wait.forLogMessage(".*Started\\ ChatBackendApplication.*\\n", 1))
+          .withLogConsumer(new Slf4jLogConsumer(log, true).withPrefix("BACKEND-2"));
+
+
+  static GenericContainer BACKEND_3 =
+      new GenericContainer(DockerImageName.parse("juplo/chat-backend:0.0.1-SNAPSHOT"))
+          .withImagePullPolicy(NEVER_PULL)
+          .withNetwork(NETWORK)
+          .withNetworkAliases("backend-3")
+          .withCommand(
+              "--chat.backend.instance-id=backend-3",
+              "--chat.backend.services=kafka",
+              "--chat.backend.kafka.bootstrap-servers=kafka:9999",
+              "--chat.backend.kafka.instance-uri=http://backend-3:8080",
+              "--chat.backend.kafka.num-partitions=10",
+              "--chat.backend.kafka.client-id-prefix=B3",
+              "--chat.backend.kafka.haproxy-runtime-api=haproxy:8401",
+              "--chat.backend.kafka.haproxy-map=/usr/local/etc/haproxy/sharding.map"
+          )
+          .withExposedPorts(8080)
+          .dependsOn(KAFKA)
+          .waitingFor(Wait.forLogMessage(".*Started\\ ChatBackendApplication.*\\n", 1))
+          .withLogConsumer(new Slf4jLogConsumer(log, true).withPrefix("BACKEND-3"));
+
+  static GenericContainer HAPROXY =
+      new GenericContainer(DockerImageName.parse("haproxytech/haproxy-debian:2.8"))
+          .withNetwork(NETWORK)
+          .withNetworkAliases("haproxy")
+          .withClasspathResourceMapping(
+              "haproxy.cfg",
+              "/usr/local/etc/haproxy/haproxy.cfg",
+              BindMode.READ_ONLY)
+          .withClasspathResourceMapping(
+              "sharding.map",
+              "/usr/local/etc/haproxy/sharding.map",
+              BindMode.READ_WRITE)
+          .withExposedPorts(8400, 8401, 8404)
+          .withLogConsumer(new Slf4jLogConsumer(log, true).withPrefix("HAPROXY"));
+}
diff --git a/src/test/resources/haproxy.cfg b/src/test/resources/haproxy.cfg
new file mode 100644
index 00000000..28e889a8
--- /dev/null
+++ b/src/test/resources/haproxy.cfg
@@ -0,0 +1,42 @@
+# Config from Blog-article "How to Run HAProxy with Docker"
+defaults
+  mode http
+  timeout client 10s
+  timeout connect 5s
+  timeout server 10m
+  timeout http-request 10s
+  log global
+  default-server init-addr last,libc,none
+
+global
+  stats socket ipv4@:8401 level admin
+  stats socket /var/run/haproxy.sock mode 666 level admin
+  stats timeout 2m
+
+resolvers docker
+  parse-resolv-conf
+
+frontend stats
+  bind *:8404
+  stats enable
+  stats uri /
+  stats refresh 10s
+
+frontend frontend
+  bind :8400
+  default_backend random
+  use_backend %[req.hdr(X-Shard),map(/usr/local/etc/haproxy/sharding.map)]
+
+backend random
+  server b1 backend-1:8080 check
+  server b2 backend-2:8080 check
+  server b3 backend-3:8080 check
+
+backend backend_1
+  server b1 backend-1:8080 check
+
+backend backend_2
+  server b2 backend-2:8080 check
+
+backend backend_3
+  server b3 backend-3:8080 check
diff --git a/src/test/resources/sharding.map b/src/test/resources/sharding.map
new file mode 100644
index 00000000..e69de29b