refactor: add retry operation to single page publishing (#3422)

#### What type of PR is this?
/kind improvement
/area core
/milestone 2.3.x
#### What this PR does / why we need it:
修复初始化时自定义页面会发布失败的问题

#### Which issue(s) this PR fixes:
Fixes #3279
#### Does this PR introduce a user-facing change?
```release-note
None
```

src/main/java/run/halo/app/core/extension/endpoint/PostEndpoint.java

@@ -214,19 +214,20 @@ public class PostEndpoint implements CustomEndpoint {
         boolean asyncPublish = request.queryParam("async")
             .map(Boolean::parseBoolean)
             .orElse(false);
-        return client.get(Post.class, name)
-            .doOnNext(post -> {
-                var spec = post.getSpec();
-                request.queryParam("headSnapshot").ifPresent(spec::setHeadSnapshot);
-                spec.setPublish(true);
-                if (spec.getHeadSnapshot() == null) {
-                    spec.setHeadSnapshot(spec.getBaseSnapshot());
-                }
-                // TODO Provide release snapshot query param to control
-                spec.setReleaseSnapshot(spec.getHeadSnapshot());
-            })
-            .flatMap(client::update)
-            .retryWhen(Retry.backoff(3, Duration.ofMillis(100))
+        return Mono.defer(() -> client.get(Post.class, name)
+                .doOnNext(post -> {
+                    var spec = post.getSpec();
+                    request.queryParam("headSnapshot").ifPresent(spec::setHeadSnapshot);
+                    spec.setPublish(true);
+                    if (spec.getHeadSnapshot() == null) {
+                        spec.setHeadSnapshot(spec.getBaseSnapshot());
+                    }
+                    // TODO Provide release snapshot query param to control
+                    spec.setReleaseSnapshot(spec.getHeadSnapshot());
+                })
+                .flatMap(client::update)
+            )
+            .retryWhen(Retry.backoff(5, Duration.ofMillis(100))
                 .filter(t -> t instanceof OptimisticLockingFailureException))
             .flatMap(post -> {
                 if (asyncPublish) {
@@ -243,7 +244,7 @@ public class PostEndpoint implements CustomEndpoint {
                         }
                         throw new RetryException("Post publishing status is not as expected");
                     })
-                    .retryWhen(Retry.fixedDelay(10, Duration.ofMillis(100))
+                    .retryWhen(Retry.fixedDelay(10, Duration.ofMillis(200))
                         .filter(t -> t instanceof RetryException))
                     .doOnError(IllegalStateException.class, err -> {
                         log.error("Failed to publish post [{}]", name, err);

src/main/java/run/halo/app/core/extension/endpoint/SinglePageEndpoint.java

@@ -11,6 +11,7 @@ import lombok.AllArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 import org.springdoc.core.fn.builders.schema.Builder;
 import org.springdoc.webflux.core.fn.SpringdocRouteBuilder;
+import org.springframework.dao.OptimisticLockingFailureException;
 import org.springframework.http.MediaType;
 import org.springframework.retry.RetryException;
 import org.springframework.stereotype.Component;
@@ -189,16 +190,19 @@ public class SinglePageEndpoint implements CustomEndpoint {
         boolean asyncPublish = request.queryParam("async")
             .map(Boolean::parseBoolean)
             .orElse(false);
-        return client.fetch(SinglePage.class, name)
-            .flatMap(singlePage -> {
-                SinglePage.SinglePageSpec spec = singlePage.getSpec();
-                spec.setPublish(true);
-                if (spec.getHeadSnapshot() == null) {
-                    spec.setHeadSnapshot(spec.getBaseSnapshot());
-                }
-                spec.setReleaseSnapshot(spec.getHeadSnapshot());
-                return client.update(singlePage);
-            })
+        return Mono.defer(() -> client.get(SinglePage.class, name)
+                .flatMap(singlePage -> {
+                    SinglePage.SinglePageSpec spec = singlePage.getSpec();
+                    spec.setPublish(true);
+                    if (spec.getHeadSnapshot() == null) {
+                        spec.setHeadSnapshot(spec.getBaseSnapshot());
+                    }
+                    spec.setReleaseSnapshot(spec.getHeadSnapshot());
+                    return client.update(singlePage);
+                })
+            )
+            .retryWhen(Retry.backoff(5, Duration.ofMillis(100))
+                .filter(t -> t instanceof OptimisticLockingFailureException))
             .flatMap(post -> {
                 if (asyncPublish) {
                     return Mono.just(post);

src/test/java/run/halo/app/core/extension/endpoint/PostEndpointTest.java

@@ -2,6 +2,9 @@ package run.halo.app.core.extension.endpoint;
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
 
 import org.junit.jupiter.api.BeforeEach;
@@ -11,12 +14,14 @@ import org.mockito.InjectMocks;
 import org.mockito.Mock;
 import org.mockito.junit.jupiter.MockitoExtension;
 import org.springframework.context.ApplicationEventPublisher;
+import org.springframework.dao.OptimisticLockingFailureException;
 import org.springframework.test.web.reactive.server.WebTestClient;
 import reactor.core.publisher.Mono;
 import run.halo.app.content.PostRequest;
 import run.halo.app.content.PostService;
 import run.halo.app.content.TestPost;
 import run.halo.app.core.extension.content.Post;
+import run.halo.app.extension.Metadata;
 import run.halo.app.extension.ReactiveExtensionClient;
 
 /**
@@ -75,6 +80,53 @@ class PostEndpointTest {
             .value(post -> assertThat(post).isEqualTo(TestPost.postV1()));
     }
 
+    @Test
+    void publishRetryOnOptimisticLockingFailure() {
+        var post = new Post();
+        post.setMetadata(new Metadata());
+        post.getMetadata().setName("post-1");
+        post.setSpec(new Post.PostSpec());
+        when(client.get(eq(Post.class), eq("post-1"))).thenReturn(Mono.just(post));
+
+        when(client.update(any(Post.class)))
+            .thenReturn(Mono.error(new OptimisticLockingFailureException("fake-error")));
+
+        // Send request
+        webTestClient.put()
+            .uri("/posts/{name}/publish?async=false", "post-1")
+            .exchange()
+            .expectStatus()
+            .is5xxServerError();
+
+        // Verify WebClient retry behavior
+        verify(client, times(6)).get(eq(Post.class), eq("post-1"));
+        verify(client, times(6)).update(any(Post.class));
+    }
+
+    @Test
+    void publishSuccess() {
+        var post = new Post();
+        post.setMetadata(new Metadata());
+        post.getMetadata().setName("post-1");
+        post.setSpec(new Post.PostSpec());
+        when(client.get(eq(Post.class), eq("post-1"))).thenReturn(Mono.just(post));
+        when(client.fetch(eq(Post.class), eq("post-1"))).thenReturn(Mono.empty());
+
+        when(client.update(any(Post.class)))
+            .thenReturn(Mono.just(post));
+
+        // Send request
+        webTestClient.put()
+            .uri("/posts/{name}/publish?async=false", "post-1")
+            .exchange()
+            .expectStatus()
+            .is2xxSuccessful();
+
+        // Verify WebClient retry behavior
+        verify(client, times(1)).get(eq(Post.class), eq("post-1"));
+        verify(client, times(1)).update(any(Post.class));
+    }
+
     PostRequest postRequest(Post post) {
         return new PostRequest(post, new PostRequest.Content("B", "<p>B</p>", "MARKDOWN"));
     }

src/test/java/run/halo/app/core/extension/endpoint/SinglePageEndpointTest.java

@@ -0,0 +1,92 @@
+package run.halo.app.core.extension.endpoint;
+
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+import org.springframework.dao.OptimisticLockingFailureException;
+import org.springframework.test.web.reactive.server.WebTestClient;
+import reactor.core.publisher.Mono;
+import run.halo.app.core.extension.content.SinglePage;
+import run.halo.app.extension.Metadata;
+import run.halo.app.extension.ReactiveExtensionClient;
+
+/**
+ * Tests for @{@link SinglePageEndpoint}.
+ *
+ * @author guqing
+ * @since 2.3.0
+ */
+@ExtendWith(MockitoExtension.class)
+class SinglePageEndpointTest {
+
+    @Mock
+    private ReactiveExtensionClient client;
+
+    @InjectMocks
+    SinglePageEndpoint singlePageEndpoint;
+
+    WebTestClient webTestClient;
+
+    @BeforeEach
+    void setUp() {
+        webTestClient = WebTestClient
+            .bindToRouterFunction(singlePageEndpoint.endpoint())
+            .build();
+    }
+
+    @Test
+    void publishRetryOnOptimisticLockingFailure() {
+        var page = new SinglePage();
+        page.setMetadata(new Metadata());
+        page.getMetadata().setName("page-1");
+        page.setSpec(new SinglePage.SinglePageSpec());
+        when(client.get(eq(SinglePage.class), eq("page-1"))).thenReturn(Mono.just(page));
+
+        when(client.update(any(SinglePage.class)))
+            .thenReturn(Mono.error(new OptimisticLockingFailureException("fake-error")));
+
+        // Send request
+        webTestClient.put()
+            .uri("/singlepages/{name}/publish?async=false", "page-1")
+            .exchange()
+            .expectStatus()
+            .is5xxServerError();
+
+        // Verify WebClient retry behavior
+        verify(client, times(6)).get(eq(SinglePage.class), eq("page-1"));
+        verify(client, times(6)).update(any(SinglePage.class));
+    }
+
+    @Test
+    void publishSuccess() {
+        var page = new SinglePage();
+        page.setMetadata(new Metadata());
+        page.getMetadata().setName("page-1");
+        page.setSpec(new SinglePage.SinglePageSpec());
+
+        when(client.get(eq(SinglePage.class), eq("page-1"))).thenReturn(Mono.just(page));
+        when(client.fetch(eq(SinglePage.class), eq("page-1"))).thenReturn(Mono.empty());
+
+        when(client.update(any(SinglePage.class))).thenReturn(Mono.just(page));
+
+        // Send request
+        webTestClient.put()
+            .uri("/singlepages/{name}/publish?async=false", "page-1")
+            .exchange()
+            .expectStatus()
+            .is2xxSuccessful();
+
+        // Verify WebClient retry behavior
+        verify(client, times(1)).get(eq(SinglePage.class), eq("page-1"));
+        verify(client, times(1)).update(any(SinglePage.class));
+    }
+}