implement simple external load balancer with cloud gateway

Author: hamidreza-ka

.idea/encodings.xml

@@ -0,0 +1,42 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>com.hrk</groupId>
+        <artifactId>microservices-tutorial</artifactId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+
+    <artifactId>apigw</artifactId>
+
+    <properties>
+        <maven.compiler.source>20</maven.compiler.source>
+        <maven.compiler.target>20</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.cloud</groupId>
+            <artifactId>spring-cloud-starter-gateway</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.cloud</groupId>
+            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.cloud</groupId>
+            <artifactId>spring-cloud-starter-sleuth</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.cloud</groupId>
+            <artifactId>spring-cloud-sleuth-zipkin</artifactId>
+        </dependency>
+    </dependencies>
+
+</project>

apigw/pom.xml

@@ -0,0 +1,13 @@
+package com.hrk.apigw;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
+
+@SpringBootApplication
+@EnableEurekaClient
+public class ApiGWApplication {
+    public static void main(String[] args) {
+        SpringApplication.run(ApiGWApplication.class, args);
+    }
+}

apigw/src/main/java/com/hrk/apigw/ApiGWApplication.java

@@ -0,0 +1,24 @@
+server:
+  port: 8083
+
+spring:
+  application:
+    name: api-gateway
+
+  zipkin:
+    base-url: http://localhost:9411
+
+  cloud:
+    gateway:
+      routes:
+        - id: customer
+          uri: lb://CUSTOMER
+          predicates:
+            - Path=/api/v1/customer/**
+
+eureka:
+  client:
+    service-url:
+      defaultZone: http://localhost:8761/eureka
+    fetch-registry: true
+    register-with-eureka: true

apigw/src/main/resources/application.yml

@@ -0,0 +1,6 @@
+  ,---.  ,------. ,--.        ,----.             ,--.
+ /  O  \ |  .--. '|  |,-----.'  .-./    ,--,--.,-'  '-. ,---. ,--.   ,--. ,--,--.,--. ,--.
+|  .-.  ||  '--' ||  |'-----'|  | .---.' ,-.  |'-.  .-'| .-. :|  |.'.|  |' ,-.  | \  '  /
+|  | |  ||  | --' |  |       '  '--'  |\ '-'  |  |  |  \   --.|   .'.   |\ '-'  |  \   '
+`--' `--'`--'     `--'        `------'  `--`--'  `--'   `----''--'   '--' `--`--'.-'  /
+                                                                                 `---'

apigw/src/main/resources/banner.txt

@@ -16,6 +16,7 @@
         <module>eureka-server</module>
         <module>clients</module>
         <module>notification</module>
+        <module>apigw</module>
     </modules>
 
     <properties>