refactor: add retry mechanism to Feign clients for improved resilience

src/main/java/com/magamochi/catalog/client/AniListClient.java

@@ -3,15 +3,28 @@ package com.magamochi.catalog.client;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import java.util.List;
 import org.springframework.cloud.openfeign.FeignClient;
+import org.springframework.resilience.annotation.Retryable;
 import org.springframework.web.bind.annotation.PostMapping;
 import org.springframework.web.bind.annotation.RequestBody;
 
 @FeignClient(name = "aniList", url = "https://graphql.anilist.co")
 public interface AniListClient {
   @PostMapping
+  @Retryable(
+      maxRetries = 5,
+      delay = 1000,
+      multiplier = 2,
+      maxDelay = 5000,
+      includes = Exception.class)
   MangaResponse getManga(@RequestBody GraphQLRequest request);
 
   @PostMapping
+  @Retryable(
+      maxRetries = 5,
+      delay = 1000,
+      multiplier = 2,
+      maxDelay = 5000,
+      includes = Exception.class)
   MangaSearchResponse searchManga(@RequestBody SearchGraphQLRequest request);
 
   record GraphQLRequest(String query, Variables variables) {

src/main/java/com/magamochi/catalog/client/JikanClient.java

@@ -3,6 +3,7 @@ package com.magamochi.catalog.client;
 import java.time.OffsetDateTime;
 import java.util.List;
 import org.springframework.cloud.openfeign.FeignClient;
+import org.springframework.resilience.annotation.Retryable;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.web.bind.annotation.RequestParam;
@@ -10,9 +11,21 @@ import org.springframework.web.bind.annotation.RequestParam;
 @FeignClient(name = "jikan", url = "https://api.jikan.moe/v4/manga")
 public interface JikanClient {
   @GetMapping
+  @Retryable(
+      maxRetries = 3,
+      delay = 1000,
+      multiplier = 2,
+      maxDelay = 5000,
+      includes = Exception.class)
   SearchResponse mangaSearch(@RequestParam String q);
 
   @GetMapping("/{id}")
+  @Retryable(
+      maxRetries = 3,
+      delay = 1000,
+      multiplier = 2,
+      maxDelay = 5000,
+      includes = Exception.class)
   MangaResponse getMangaById(@PathVariable Long id);
 
   record SearchResponse(List<MangaData> data) {

src/main/java/com/magamochi/client/MangaDexClient.java

@@ -4,18 +4,37 @@ import com.magamochi.model.dto.MangaDexMangaDTO;
 import java.util.List;
 import java.util.UUID;
 import org.springframework.cloud.openfeign.FeignClient;
+import org.springframework.resilience.annotation.Retryable;
 import org.springframework.web.bind.annotation.*;
 
 @FeignClient(name = "mangaDex", url = "https://api.mangadex.org")
 public interface MangaDexClient {
   @GetMapping("/manga/{id}")
+  @Retryable(
+      maxRetries = 3,
+      delay = 1000,
+      multiplier = 2,
+      maxDelay = 5000,
+      includes = Exception.class)
   MangaDexMangaDTO getManga(@PathVariable UUID id);
 
   @GetMapping("/manga/{id}/feed")
+  @Retryable(
+      maxRetries = 3,
+      delay = 1000,
+      multiplier = 2,
+      maxDelay = 5000,
+      includes = Exception.class)
   MangaDexMangaFeedDTO getMangaFeed(
       @PathVariable UUID id, @RequestParam("contentRating[]") List<String> contentRating);
 
   @GetMapping("/manga/{id}/feed")
+  @Retryable(
+      maxRetries = 3,
+      delay = 1000,
+      multiplier = 2,
+      maxDelay = 5000,
+      includes = Exception.class)
   MangaDexMangaFeedDTO getMangaFeed(
       @PathVariable UUID id,
       @RequestParam int limit,
@@ -23,6 +42,12 @@ public interface MangaDexClient {
       @RequestParam("contentRating[]") List<String> contentRating);
 
   @GetMapping("/at-home/server/{chapterId}")
+  @Retryable(
+      maxRetries = 3,
+      delay = 1000,
+      multiplier = 2,
+      maxDelay = 5000,
+      includes = Exception.class)
   MangaChapterDataDTO getMangaChapter(@PathVariable UUID chapterId);
 
   record MangaDexMangaFeedDTO(

src/main/java/com/magamochi/client/NtfyClient.java

@@ -2,11 +2,18 @@ package com.magamochi.client;
 
 import org.springframework.cloud.openfeign.FeignClient;
 import org.springframework.http.MediaType;
+import org.springframework.resilience.annotation.Retryable;
 import org.springframework.web.bind.annotation.*;
 
 @FeignClient(name = "ntfy", url = "${ntfy.endpoint}")
 public interface NtfyClient {
   @PostMapping(consumes = MediaType.APPLICATION_JSON_VALUE)
+  @Retryable(
+      maxRetries = 3,
+      delay = 1000,
+      multiplier = 2,
+      maxDelay = 5000,
+      includes = Exception.class)
   void notify(@RequestBody Request dto);
 
   record Request(String topic, String message, String title) {}

src/main/java/com/magamochi/image/queue/consumer/ImageFetchConsumer.java

@@ -1,5 +1,7 @@
 package com.magamochi.image.queue.consumer;
 
+import static java.util.Objects.nonNull;
+
 import com.magamochi.common.queue.command.ImageFetchCommand;
 import com.magamochi.common.queue.command.ImageUpdateCommand;
 import com.magamochi.image.queue.producer.ImageUpdateProducer;
@@ -21,8 +23,9 @@ public class ImageFetchConsumer {
     log.info("Received image fetch command: {}", command);
 
     var imageId = imageFetchService.fetchImage(command.url(), command.contentType());
-
+    if (nonNull(imageId)) {
       imageUpdateProducer.publishImageUpdateCommand(
           new ImageUpdateCommand(command.entityId(), imageId), command.contentType());
     }
   }
+}