Аппендер вывода логов в LanguageClient, если он подключен

src/main/java/com/github/_1c_syntax/bsl/languageserver/BSLLSPLauncher.java

@@ -28,7 +28,6 @@
 import com.github._1c_syntax.bsl.languageserver.cli.WebsocketCommand;
 import com.github._1c_syntax.utils.CaseInsensitivePattern;
 import lombok.RequiredArgsConstructor;
-import org.springframework.boot.CommandLineRunner;
 import org.springframework.boot.ExitCodeGenerator;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.WebApplicationType;
@@ -71,7 +70,7 @@
   havingValue = "true",
   matchIfMissing = true)
 @RequiredArgsConstructor
-public class BSLLSPLauncher implements Callable<Integer>, CommandLineRunner, ExitCodeGenerator {
+public class BSLLSPLauncher implements Callable<Integer>, ExitCodeGenerator {
 
   private static final String DEFAULT_COMMAND = "lsp";
 
@@ -106,15 +105,17 @@ public static void main(String[] args) {
     var applicationContext = new SpringApplicationBuilder(BSLLSPLauncher.class)
       .web(getWebApplicationType(args))
       .run(args);
+
     var launcher = applicationContext.getBean(BSLLSPLauncher.class);
+    launcher.run(args);
+
     if (launcher.getExitCode() >= 0) {
       System.exit(
         SpringApplication.exit(applicationContext)
       );
     }
   }
 
-  @Override
   public void run(String... args) {
     var cmd = new CommandLine(this, picocliFactory);
 

src/main/java/com/github/_1c_syntax/bsl/languageserver/context/computer/DiagnosticComputer.java

@@ -69,14 +69,7 @@ private List<Diagnostic> internalCompute(DocumentContext documentContext) {
         try {
           return diagnostic.getDiagnostics(documentContext).stream();
         } catch (RuntimeException e) {
-          /*
-          TODO:
-          В случае если подключен ленг клиент, то логирование ошибки в консоль приводит к падению сервера
-          т.к данный лог идёт в выхлоп не по протоколу.
-          Требуется обернуть логгер в случае подключенного ленг клиента и слать прокольное событие
-          которое запишет ошибку в лог.
-          */
-          String message = String.format(
+          var message = String.format(
             "Diagnostic computation error.%nFile: %s%nDiagnostic: %s",
             documentContext.getUri(),
             diagnostic.getInfo().getCode()

src/main/java/com/github/_1c_syntax/bsl/languageserver/infrastructure/LanguageClientAwareAppender.java

@@ -0,0 +1,103 @@
+/*
+ * This file is a part of BSL Language Server.
+ *
+ * Copyright (c) 2018-2023
+ * Alexey Sosnoviy <[email protected]>, Nikita Fedkin <[email protected]> and contributors
+ *
+ * SPDX-License-Identifier: LGPL-3.0-or-later
+ *
+ * BSL Language Server is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3.0 of the License, or (at your option) any later version.
+ *
+ * BSL Language Server is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with BSL Language Server.
+ */
+package com.github._1c_syntax.bsl.languageserver.infrastructure;
+
+import ch.qos.logback.classic.Level;
+import ch.qos.logback.classic.spi.ILoggingEvent;
+import ch.qos.logback.core.ConsoleAppender;
+import com.github._1c_syntax.bsl.languageserver.LanguageClientHolder;
+import jakarta.annotation.Nullable;
+import lombok.Setter;
+import org.eclipse.lsp4j.MessageParams;
+import org.eclipse.lsp4j.MessageType;
+import org.springframework.beans.factory.annotation.Autowired;
+
+import java.io.IOException;
+import java.util.Map;
+
+/**
+ * Расширение штатного {@link ConsoleAppender}, выводящего сообщения
+ * в {@link org.eclipse.lsp4j.services.LanguageClient}, если он подключен,
+ * или в штатные потоки вывода в обратном случае.
+ */
+public class LanguageClientAwareAppender
+  extends ConsoleAppender<ILoggingEvent> {
+
+  /**
+   * Singletone-like хранилище проинициализированного инфраструктурой Logback аппендера
+   * для последующего возврата его через {@link LogbackConfiguration#languageClientAwareAppender()}.
+   */
+  protected static LanguageClientAwareAppender INSTANCE;
+
+  private static final Map<Level, MessageType> loggingLevels = Map.of(
+    Level.TRACE, MessageType.Log,
+    Level.DEBUG, MessageType.Log,
+    Level.ERROR, MessageType.Error,
+    Level.INFO, MessageType.Info,
+    Level.WARN, MessageType.Warning
+  );
+
+  /**
+   * Хранилище возможно подключенного LanguageClient.
+   */
+  @Nullable
+  @Setter(onMethod_ = {@Autowired})
+  private LanguageClientHolder clientHolder;
+
+  /**
+   * Конструктор по умолчанию.
+   * <p>
+   * Сохраняет сконструированный объект в переменную {@link LanguageClientAwareAppender#INSTANCE}.
+   */
+  public LanguageClientAwareAppender() {
+    super();
+    // hacky hack
+    INSTANCE = this;
+  }
+
+  /**
+   * Общий метод вывода информации, проверяющий наличие подключенного LanguageClient.
+   *
+   * @param event Логируемое событие
+   * @throws IOException Выбрасывает исключение в случае ошибок записи в стандартные потоки вывода.
+   */
+  @Override
+  protected void writeOut(ILoggingEvent event) throws IOException {
+    if (clientHolder != null && clientHolder.isConnected()) {
+      var languageClient = clientHolder.getClient().orElseThrow();
+
+      var messageType = loggingLevels.getOrDefault(event.getLevel(), MessageType.Log);
+      String message = "[%s - %s] [%s] [%s]: %s".formatted(
+        event.getLevel(),
+        event.getInstant(),
+        event.getThreadName(),
+        event.getLoggerName(),
+        event.getFormattedMessage()
+      );
+      var params = new MessageParams(messageType, message);
+      languageClient.logMessage(params);
+
+      return;
+    }
+    super.writeOut(event);
+  }
+}

src/main/java/com/github/_1c_syntax/bsl/languageserver/infrastructure/LogbackConfiguration.java

@@ -0,0 +1,40 @@
+/*
+ * This file is a part of BSL Language Server.
+ *
+ * Copyright (c) 2018-2023
+ * Alexey Sosnoviy <[email protected]>, Nikita Fedkin <[email protected]> and contributors
+ *
+ * SPDX-License-Identifier: LGPL-3.0-or-later
+ *
+ * BSL Language Server is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3.0 of the License, or (at your option) any later version.
+ *
+ * BSL Language Server is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with BSL Language Server.
+ */
+package com.github._1c_syntax.bsl.languageserver.infrastructure;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+/**
+ * Spring-конфигурация для настройки logback.
+ */
+@Configuration
+public class LogbackConfiguration {
+
+  /**
+   * @return Настроенный аппендер сообщений в LanguageClient.
+   */
+  @Bean
+  public LanguageClientAwareAppender languageClientAwareAppender() {
+    return LanguageClientAwareAppender.INSTANCE;
+  }
+}

src/main/resources/language-client-aware-appender.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<included>
+    <appender name="LANGUAGE_CLIENT_AWARE" class="com.github._1c_syntax.bsl.languageserver.infrastructure.LanguageClientAwareAppender">
+        <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
+            <level>${CONSOLE_LOG_THRESHOLD}</level>
+        </filter>
+        <encoder>
+            <pattern>${CONSOLE_LOG_PATTERN}</pattern>
+            <charset>${CONSOLE_LOG_CHARSET}</charset>
+        </encoder>
+    </appender>
+</included>

src/main/resources/logback-spring.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration>
+    <include resource="org/springframework/boot/logging/logback/defaults.xml"/>
+    <include resource="language-client-aware-appender.xml" />
+    <root level="INFO">
+        <appender-ref ref="LANGUAGE_CLIENT_AWARE" />
+    </root>
+</configuration>