refactor: optimize the way to obtain plugin configurations (halo-dev#135)

### What this PR does?
/kind improvement

优化插件配置的获取方式

2.17.0 已经对配置获取增加了缓存因此不必在需要插件手动处理

```release-note
None
```

Author: guqing

src/main/java/run/halo/comment/widget/DefaultCommentWidget.java

@@ -1,7 +1,6 @@
 package run.halo.comment.widget;
 
 import java.util.Properties;
-import lombok.Data;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 import org.apache.commons.lang3.StringUtils;
@@ -29,7 +28,6 @@ public class DefaultCommentWidget implements CommentWidget {
     static final PropertyPlaceholderHelper PROPERTY_PLACEHOLDER_HELPER = new PropertyPlaceholderHelper("${", "}");
 
     private final PluginWrapper pluginWrapper;
-    private final SettingFetcher settingFetcher;
     private final SettingConfigGetter settingConfigGetter;
 
     @Override
@@ -65,15 +63,13 @@ private String commentHtml(IAttribute groupAttribute, IAttribute kindAttribute,
         properties.setProperty("name", nameAttribute.getValue());
         properties.setProperty("domId", domIdFrom(group, kindAttribute.getValue(), nameAttribute.getValue()));
 
-        var basicConfig = settingFetcher.fetch(BasicConfig.GROUP, BasicConfig.class)
-            .orElse(new BasicConfig());
+        var basicConfig = settingConfigGetter.getBasicConfig().blockOptional().orElseThrow();
         properties.setProperty("size", String.valueOf(basicConfig.getSize()));
         properties.setProperty("replySize", String.valueOf(basicConfig.getReplySize()));
         properties.setProperty("withReplies", String.valueOf(basicConfig.isWithReplies()));
         properties.setProperty("withReplySize", String.valueOf(basicConfig.getWithReplySize()));
 
-        var avatarConfig = settingFetcher.fetch(AvatarConfig.GROUP, AvatarConfig.class)
-            .orElse(new AvatarConfig());
+        var avatarConfig = settingConfigGetter.getAvatarConfig().blockOptional().orElseThrow();
         properties.setProperty("useAvatarProvider", String.valueOf(avatarConfig.isEnable()));
         properties.setProperty("avatarProvider", String.valueOf(avatarConfig.getProvider()));
         properties.setProperty("avatarProviderMirror", String.valueOf(avatarConfig.getProviderMirror()));
@@ -111,24 +107,6 @@ private String commentHtml(IAttribute groupAttribute, IAttribute kindAttribute,
             """, properties);
     }
 
-    @Data
-    private static class BasicConfig {
-        public static final String GROUP = "basic";
-        private int size;
-        private int replySize;
-        private boolean withReplies;
-        private int withReplySize;
-    }
-
-    @Data
-    private static class AvatarConfig {
-        public static final String GROUP = "avatar";
-        private boolean enable;
-        private String provider;
-        private String providerMirror;
-        private String policy;
-    }
-
     private String domIdFrom(String group, String kind, String name) {
         Assert.notNull(name, "The name must not be null.");
         Assert.notNull(kind, "The kind must not be null.");

src/main/java/run/halo/comment/widget/SettingConfigGetter.java

@@ -9,11 +9,26 @@
 
 public interface SettingConfigGetter {
 
+    /**
+     * Never {@link Mono#empty()}.
+     */
+    Mono<BasicConfig> getBasicConfig();
+
+    /**
+     * Never {@link Mono#empty()}.
+     */
+    Mono<AvatarConfig> getAvatarConfig();
+
+    /**
+     * Never {@link Mono#empty()}.
+     */
     Mono<SecurityConfig> getSecurityConfig();
 
     @Data
     @Accessors(chain = true)
     class SecurityConfig {
+        public static final String GROUP = "security";
+
         @Getter(onMethod_ = @NonNull)
         private CaptchaConfig captcha = CaptchaConfig.empty();
 
@@ -46,4 +61,22 @@ public static CaptchaConfig empty() {
             return new CaptchaConfig();
         }
     }
+
+    @Data
+    class BasicConfig {
+        public static final String GROUP = "basic";
+        private int size;
+        private int replySize;
+        private boolean withReplies;
+        private int withReplySize;
+    }
+
+    @Data
+    class AvatarConfig {
+        public static final String GROUP = "avatar";
+        private boolean enable;
+        private String provider;
+        private String providerMirror;
+        private String policy;
+    }
 }

src/main/java/run/halo/comment/widget/SettingConfigGetterImpl.java

@@ -1,76 +1,30 @@
 package run.halo.comment.widget;
 
-import static run.halo.app.extension.index.query.QueryFactory.equal;
-
-import java.util.function.Function;
-import com.google.common.cache.Cache;
-import com.google.common.cache.CacheBuilder;
 import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Component;
 import reactor.core.publisher.Mono;
-import run.halo.app.extension.ConfigMap;
-import run.halo.app.extension.DefaultExtensionMatcher;
-import run.halo.app.extension.ExtensionClient;
-import run.halo.app.extension.controller.Controller;
-import run.halo.app.extension.controller.ControllerBuilder;
-import run.halo.app.extension.controller.Reconciler;
-import run.halo.app.extension.router.selector.FieldSelector;
 import run.halo.app.plugin.ReactiveSettingFetcher;
 
 @Component
 @RequiredArgsConstructor
 public class SettingConfigGetterImpl implements SettingConfigGetter {
     private final ReactiveSettingFetcher settingFetcher;
-    private final SettingConfigCache settingConfigCache;
 
     @Override
-    public Mono<SecurityConfig> getSecurityConfig() {
-        return settingConfigCache.get("security",
-            key -> settingFetcher.fetch("security", SecurityConfig.class)
-                .defaultIfEmpty(SecurityConfig.empty())
-        );
+    public Mono<BasicConfig> getBasicConfig() {
+        return settingFetcher.fetch(BasicConfig.GROUP, BasicConfig.class)
+            .defaultIfEmpty(new BasicConfig());
     }
 
-    interface SettingConfigCache {
-        <T> Mono<T> get(String key, Function<String, Mono<T>> loader);
+    @Override
+    public Mono<AvatarConfig> getAvatarConfig() {
+        return settingFetcher.fetch(AvatarConfig.GROUP, AvatarConfig.class)
+            .defaultIfEmpty(new AvatarConfig());
     }
 
-    @Component
-    @RequiredArgsConstructor
-    static class SettingConfigCacheImpl implements Reconciler<Reconciler.Request>, SettingConfigCache {
-        private static final String CONFIG_NAME = "plugin-comment-widget-configmap";
-
-        private final Cache<String, Object> cache = CacheBuilder.newBuilder()
-            .maximumSize(10)
-            .build();
-
-        private final ExtensionClient client;
-
-        @SuppressWarnings("unchecked")
-        public <T> Mono<T> get(String key, Function<String, Mono<T>> loader) {
-            return Mono.justOrEmpty(cache.getIfPresent(key))
-                .switchIfEmpty(loader.apply(key).doOnNext(value -> cache.put(key, value)))
-                .map(object -> (T) object);
-        }
-
-        @Override
-        public Result reconcile(Request request) {
-            cache.invalidateAll();
-            return Result.doNotRetry();
-        }
-
-        @Override
-        public Controller setupWith(ControllerBuilder builder) {
-            var extension = new ConfigMap();
-            var extensionMatcher = DefaultExtensionMatcher.builder(client, extension.groupVersionKind())
-                .fieldSelector(FieldSelector.of(equal("metadata.name", CONFIG_NAME)))
-                .build();
-            return builder
-                .extension(extension)
-                .syncAllOnStart(false)
-                .onAddMatcher(extensionMatcher)
-                .onUpdateMatcher(extensionMatcher)
-                .build();
-        }
+    @Override
+    public Mono<SecurityConfig> getSecurityConfig() {
+        return settingFetcher.fetch(SecurityConfig.GROUP, SecurityConfig.class)
+            .defaultIfEmpty(SecurityConfig.empty());
     }
 }

src/main/resources/plugin.yaml

@@ -8,7 +8,7 @@ metadata:
     "store.halo.run/app-id": "app-YXyaD"
 spec:
   enabled: true
-  requires: ">=2.15.0"
+  requires: ">=2.17.0"
   author:
     name: Halo
     website: https://github.com/halo-dev