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Support restarting Halo (halo-dev#4361)
#### What type of PR is this? /kind feature /area core /milestone 2.9.x #### What this PR does / why we need it: Support restarting Halo and enable restart endpoint by default. Restart endpoint detail: request uri: `/actuator/restart` request method: `POST` Please note that memory usage may slightly increase after restarting Halo. #### Does this PR introduce a user-facing change? ```release-note 支持在线重启 Halo。 ```
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application/src/main/java/run/halo/app/actuator/RestartEndpoint.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,77 @@ | ||
| package run.halo.app.actuator; | ||
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| import java.io.Closeable; | ||
| import java.io.IOException; | ||
| import java.util.Collections; | ||
| import lombok.extern.slf4j.Slf4j; | ||
| import org.springframework.boot.SpringApplication; | ||
| import org.springframework.boot.actuate.endpoint.annotation.WriteOperation; | ||
| import org.springframework.boot.actuate.endpoint.web.annotation.WebEndpoint; | ||
| import org.springframework.boot.context.event.ApplicationStartedEvent; | ||
| import org.springframework.context.ApplicationContext; | ||
| import org.springframework.context.ApplicationListener; | ||
| import org.springframework.context.ConfigurableApplicationContext; | ||
| import org.springframework.stereotype.Component; | ||
| import run.halo.app.Application; | ||
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|
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| @WebEndpoint(id = "restart") | ||
| @Component | ||
| @Slf4j | ||
| public class RestartEndpoint implements ApplicationListener<ApplicationStartedEvent> { | ||
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| private SpringApplication application; | ||
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|
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| private String[] args; | ||
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| private ConfigurableApplicationContext context; | ||
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| @WriteOperation | ||
| public Object restart() { | ||
| var threadGroup = new ThreadGroup("RestartGroup"); | ||
| var thread = new Thread(threadGroup, this::doRestart, "restartMain"); | ||
| thread.setDaemon(false); | ||
| thread.setContextClassLoader(Application.class.getClassLoader()); | ||
| thread.start(); | ||
| return Collections.singletonMap("message", "Restarting"); | ||
| } | ||
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| private synchronized void doRestart() { | ||
| log.info("Restarting..."); | ||
| if (this.context != null) { | ||
| try { | ||
| closeRecursively(this.context); | ||
| var shutdownHandlers = SpringApplication.getShutdownHandlers(); | ||
| if (shutdownHandlers instanceof Runnable runnable) { | ||
| // clear closedContext in org.springframework.boot.SpringApplicationShutdownHook | ||
| runnable.run(); | ||
| } | ||
| this.context = this.application.run(args); | ||
| log.info("Restarted"); | ||
| } catch (Throwable t) { | ||
| log.error("Failed to restart.", t); | ||
| } | ||
| } | ||
| } | ||
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| private static void closeRecursively(ApplicationContext ctx) { | ||
| while (ctx != null) { | ||
| if (ctx instanceof Closeable closeable) { | ||
| try { | ||
| closeable.close(); | ||
| } catch (IOException e) { | ||
| log.error("Cannot close context: {}", ctx.getId(), e); | ||
| } | ||
| } | ||
| ctx = ctx.getParent(); | ||
| } | ||
| } | ||
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| @Override | ||
| public void onApplicationEvent(ApplicationStartedEvent event) { | ||
| if (this.context == null) { | ||
| this.application = event.getSpringApplication(); | ||
| this.args = event.getArgs(); | ||
| this.context = event.getApplicationContext(); | ||
| } | ||
| } | ||
| } |
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