☀️ Core > Redis 코어 모듈 + 도메인별 캐싱 전략 수립

core/core.settings.gradle.kts

@@ -4,7 +4,6 @@ val core = rootDir.resolve("core")
     .filter(File::isDirectory)
     .associateBy(File::getName)
 
-
 include(
     ":time-util",
     ":jpa-core",
@@ -14,7 +13,10 @@ include(
     ":snowflake-id-api",
     ":snowflake-id-hibernate",
     ":client-api",
-    ":rest-client"
+    ":rest-client",
+    ":redis-api",
+    ":redis-template",
+    ":redis-cache",
 )
 
 project(":time-util").projectDir = core["time-util"]!!
@@ -25,4 +27,7 @@ project(":cors-api").projectDir = core["nettee-cors-api"]!!
 project(":snowflake-id-api").projectDir = core["nettee-snowflake-id-api"]!!
 project(":snowflake-id-hibernate").projectDir = core["nettee-snowflake-id-hibernate"]!!
 project(":client-api").projectDir = core["nettee-client-api"]!!
-project(":rest-client").projectDir = core["nettee-rest-client"]!!
+project(":rest-client").projectDir = core["nettee-rest-client"]!!
+project(":redis-api").projectDir = core["nettee-redis-api"]!!
+project(":redis-template").projectDir = core["nettee-redis-template"]!!
+project(":redis-cache").projectDir = core["nettee-redis-cache"]!!

core/redis/nettee-redis-api/build.gradle.kts

@@ -0,0 +1,9 @@
+dependencies{
+    api("org.springframework.boot:spring-boot-autoconfigure")
+    api("org.springframework.boot:spring-boot-starter-data-redis")
+    compileOnly("org.springframework:spring-context")
+    // test
+    testImplementation("org.springframework.boot:spring-boot-starter-test")
+    testImplementation("com.fasterxml.jackson.core:jackson-databind")
+    testImplementation("com.fasterxml.jackson.module:jackson-module-kotlin")
+}

core/redis/nettee-redis-api/src/main/java/nettee/redis/config/RedisConnectionConfig.java

@@ -0,0 +1,27 @@
+package nettee.redis.config;
+
+import nettee.redis.properties.RedisProperties;
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.data.redis.connection.RedisClusterConfiguration;
+import org.springframework.data.redis.connection.RedisConnectionFactory;
+import org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory;
+
+@Configuration
+@EnableConfigurationProperties(RedisProperties.class)
+public class RedisConnectionConfig {
+
+    @Bean
+    public RedisConnectionFactory redisConnectionFactory(RedisProperties redisProperties) {
+        if (redisProperties.useClusterMode()) {
+            // cluster connection
+            return new LettuceConnectionFactory(new RedisClusterConfiguration(redisProperties.nodes()));
+        } else {
+            // standalone connection
+            var node = redisProperties.nodes().getFirst().split(":");
+
+            return new LettuceConnectionFactory(node[0], Integer.parseInt(node[1]));
+        }
+    }
+}

core/redis/nettee-redis-api/src/main/java/nettee/redis/properties/RedisProperties.java

@@ -0,0 +1,47 @@
+package nettee.redis.properties;
+
+import lombok.extern.slf4j.Slf4j;
+import nettee.redis.properties.cache.RedisCacheProperties;
+import nettee.redis.properties.cache.domain.DomainCacheProperties;
+import org.springframework.boot.context.properties.ConfigurationProperties;
+
+import java.util.List;
+import java.util.Map;
+
+@Slf4j
+@ConfigurationProperties("app.redis")
+public record RedisProperties(
+        Boolean useClusterMode,
+        List<String> nodes,
+        RedisCacheProperties cache
+) {
+    public RedisProperties {
+        if (nodes == null || nodes.isEmpty()) {
+            nodes = List.of("localhost:6379");
+
+            log.warn("redis nodes is null");
+        }
+
+        nodes = nodes.stream().map(String::strip).toList();
+
+        if (useClusterMode == null || !useClusterMode) {
+            useClusterMode = false;
+
+            log.info("Redis Connection Mode is Standalone");
+
+            if (nodes.size() > 1) {
+                throw new RuntimeException("More than one Redis node is configured in standalone mode");
+            }
+        } else {
+            log.info("Redis Connection Mode is Cluster");
+        }
+
+        if (cache == null) {
+            cache = new RedisCacheProperties(
+                    Map.of("app", new DomainCacheProperties(null, null, null))
+            );
+
+            log.warn("Redis cache is null");
+        }
+    }
+}

core/redis/nettee-redis-api/src/main/java/nettee/redis/properties/cache/RedisCacheProperties.java

@@ -0,0 +1,25 @@
+package nettee.redis.properties.cache;
+
+import lombok.extern.slf4j.Slf4j;
+import nettee.redis.properties.cache.domain.DomainCacheProperties;
+
+import java.util.Map;
+import java.util.stream.Collectors;
+
+@Slf4j
+public record RedisCacheProperties(
+        Map<String, DomainCacheProperties> domains
+) {
+    public RedisCacheProperties {
+        if(domains == null || domains.isEmpty()) {
+            log.warn("redis cache domains is empty");
+        } else {
+            domains = domains.entrySet().stream()
+                    .collect(Collectors.toMap(
+                            domain -> domain.getKey().strip(),
+                            Map.Entry::getValue
+                    ));
+        }
+
+    }
+}

core/redis/nettee-redis-api/src/main/java/nettee/redis/properties/cache/domain/DomainCacheProperties.java

@@ -0,0 +1,24 @@
+package nettee.redis.properties.cache.domain;
+
+public record DomainCacheProperties(
+        Long ttl,
+        Boolean disableNull,
+        String prefix
+) {
+    public DomainCacheProperties {
+        if(ttl != null && ttl < 0L) {
+            throw new IllegalArgumentException("TTL must be zero or a positive number. Negative TTL is not allowed.");
+        }
+
+        // Default NO Cache NULL Value
+        if (disableNull == null) {
+            disableNull = true;
+        }
+
+        if (prefix == null) {
+            prefix = "";
+        }
+
+        prefix = prefix.strip();
+    }
+}

core/redis/nettee-redis-api/src/test/java/nettee/main/RedisApiTestApplication.java

@@ -0,0 +1,13 @@
+package nettee.main;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.boot.context.properties.ConfigurationPropertiesScan;
+
+@SpringBootApplication
+@ConfigurationPropertiesScan(basePackages = "nettee")
+public class RedisApiTestApplication {
+    public static void main(String[] args) {
+        SpringApplication.run(RedisApiTestApplication.class, args);
+    }
+}

core/redis/nettee-redis-api/src/test/kotlin/nettee/redis/properties/RedisPropertiesTest.kt

@@ -0,0 +1,108 @@
+package nettee.redis.properties
+
+import com.fasterxml.jackson.databind.DeserializationFeature
+import com.fasterxml.jackson.databind.ObjectMapper
+import com.fasterxml.jackson.module.kotlin.registerKotlinModule
+import io.kotest.assertions.throwables.shouldThrow
+import io.kotest.core.spec.style.FreeSpec
+import io.kotest.extensions.spring.SpringExtension
+import io.kotest.matchers.shouldBe
+import org.springframework.boot.test.context.TestConfiguration
+import org.springframework.context.annotation.Bean
+import org.springframework.context.annotation.Import
+
+@Import(RedisPropertiesTest.RedisPropertiesTest::class)
+class RedisPropertiesTest(
+    private val redisProperties: RedisProperties
+) : FreeSpec({
+
+    "[초기화 검증] Redis 설정 값을 반환" - {
+        "application.yml 모든 변수를 설정했을 때" - {
+            "useClusterMode는 정상 반환" {
+                redisProperties.useClusterMode shouldBe true
+            }
+
+            "nodes 정상 반환" {
+                redisProperties.nodes.size shouldBe 3
+            }
+
+            "cache.domains.article 정상 반환" {
+                val article = redisProperties.cache.domains["article"]!!
+                article.ttl() shouldBe 300
+                article.disableNull() shouldBe true
+                article.prefix() shouldBe "article::"
+            }
+
+            "cache.domains.comments 정상 반환" {
+                val comments = redisProperties.cache.domains["comments"]!!
+                comments.ttl() shouldBe 60
+                comments.disableNull() shouldBe false
+                comments.prefix() shouldBe "comments::"
+            }
+        }
+
+        "application.yml 일부 변수를 누락했을 때" - {
+            val nullRedisProperties = RedisProperties(null, null, null)
+
+            "useClusterMode는 기본값 false 반환" {
+                nullRedisProperties.useClusterMode shouldBe false
+            }
+
+            "nodes 기본값 localhost:6379 반환" {
+                nullRedisProperties.nodes[0] shouldBe "localhost:6379"
+            }
+
+            "cache 기본값 cache 반환" {
+                val app = nullRedisProperties.cache.domains["app"]!!
+                app.ttl() shouldBe 60
+                app.disableNull() shouldBe true
+                app.prefix() shouldBe ""
+            }
+        }
+    }
+
+    "[예외 검증] useClusterMode 예외 반환" - {
+        "useClusterMode가 false(standalone 모드) 일때" - {
+            "node가 다건이면 에러 반환" {
+                shouldThrow<RuntimeException> {
+                    RedisProperties(false, listOf("localhost:7001", "localhost:7002"), null)
+                }
+            }
+        }
+    }
+}) {
+    override fun extensions() = listOf(SpringExtension)
+
+    @TestConfiguration
+    class RedisPropertiesTest {
+
+        @Bean
+        fun redisProperties(): RedisProperties {
+            val redisYmlJson = """
+            {
+              "useClusterMode": true,
+              "nodes": ["localhost:7000", "localhost:7001", "localhost:7002"],
+              "cache": {
+                "domains": {
+                  "article": {
+                    "ttl": 300,
+                    "disableNull": true,
+                    "prefix": "article::"
+                  },
+                  "comments": {
+                    "ttl": 60,
+                    "disableNull": false,
+                    "prefix": "comments::"
+                  }
+                }
+              }
+            }
+            """.trimIndent()
+
+            val objectMapper = ObjectMapper().registerKotlinModule()
+                .configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false)
+
+            return objectMapper.readValue(redisYmlJson, RedisProperties::class.java)
+        }
+    }
+}

core/redis/nettee-redis-cache/build.gradle.kts

@@ -0,0 +1,3 @@
+dependencies{
+    api(project(":redis-api"))
+}

core/redis/nettee-redis-cache/src/main/java/nettee/redis/config/RedisCacheConfig.java

@@ -0,0 +1,52 @@
+package nettee.redis.config;
+
+import nettee.redis.properties.RedisProperties;
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.cache.annotation.EnableCaching;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.data.redis.cache.RedisCacheConfiguration;
+import org.springframework.data.redis.cache.RedisCacheManager;
+import org.springframework.data.redis.connection.RedisConnectionFactory;
+
+import java.time.Duration;
+import java.util.Map;
+import java.util.stream.Collectors;
+
+@Configuration
+@EnableCaching
+@EnableConfigurationProperties(RedisProperties.class)
+public class RedisCacheConfig {
+
+    @Bean
+    public RedisCacheManager cacheManager(RedisConnectionFactory connectionFactory, RedisProperties redisProperties) {
+        // 도메인 별 캐시 적용
+        Map<String, RedisCacheConfiguration> domainCacheConfigurations = redisProperties.cache().domains().entrySet().stream()
+                .collect(Collectors.toMap(
+                        // 도메인명 (ex: article)
+                        Map.Entry::getKey,
+                        entry -> {
+                            var domainCacheProperties = entry.getValue();
+                            var config = RedisCacheConfiguration.defaultCacheConfig();
+
+                            if(domainCacheProperties.ttl() != null){
+                                config = config.entryTtl(Duration.ofSeconds(domainCacheProperties.ttl()));
+                            }
+
+                            if (domainCacheProperties.disableNull()) {
+                                config = config.disableCachingNullValues();
+                            }
+
+                            config = config.computePrefixWith(cacheName -> domainCacheProperties.prefix());
+
+                            return config;
+                        }
+                ));
+
+        return RedisCacheManager.builder(connectionFactory)
+                .cacheDefaults(RedisCacheConfiguration.defaultCacheConfig())
+                .transactionAware()
+                .withInitialCacheConfigurations(domainCacheConfigurations)
+                .build();
+    }
+}

core/redis/nettee-redis-template/build.gradle.kts

@@ -0,0 +1,3 @@
+dependencies{
+    api(project(":redis-api"))
+}

core/redis/nettee-redis-template/src/main/java/nettee/redis/config/RedisTemplateConfig.java

@@ -0,0 +1,32 @@
+package nettee.redis.config;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.data.redis.connection.RedisConnectionFactory;
+import org.springframework.data.redis.core.RedisTemplate;
+import org.springframework.data.redis.core.StringRedisTemplate;
+import org.springframework.data.redis.serializer.GenericJackson2JsonRedisSerializer;
+import org.springframework.data.redis.serializer.StringRedisSerializer;
+
+@Configuration
+public class RedisTemplateConfig {
+
+    @Bean
+    RedisTemplate<String, Object> redisTemplate(RedisConnectionFactory connectionFactory) {
+        RedisTemplate<String, Object> redisTemplate = new RedisTemplate<>();
+
+        redisTemplate.setConnectionFactory(connectionFactory);
+        redisTemplate.setKeySerializer(new StringRedisSerializer());
+        redisTemplate.setHashKeySerializer(new GenericJackson2JsonRedisSerializer());
+
+        return redisTemplate;
+    }
+
+    @Bean
+    StringRedisTemplate stringRedisTemplate(RedisConnectionFactory connectionFactory) {
+        StringRedisTemplate stringRedisTemplate = new StringRedisTemplate();
+        stringRedisTemplate.setConnectionFactory(connectionFactory);
+
+        return stringRedisTemplate;
+    }
+}