update terraform-boot healthcheck method

src/main/java/org/eclipse/xpanse/terraform/boot/api/TerraformApiController.java

@@ -11,7 +11,6 @@
 import jakarta.validation.Valid;
 import lombok.extern.slf4j.Slf4j;
 import org.eclipse.xpanse.terraform.boot.models.SystemStatus;
-import org.eclipse.xpanse.terraform.boot.models.enums.HealthStatus;
 import org.eclipse.xpanse.terraform.boot.models.request.TerraformDeployRequest;
 import org.eclipse.xpanse.terraform.boot.models.request.TerraformDestroyRequest;
 import org.eclipse.xpanse.terraform.boot.models.request.async.TerraformAsyncDeployRequest;
@@ -58,9 +57,7 @@ public TerraformApiController(TerraformExecutor terraformExecutor) {
     @GetMapping(value = "/health", produces = MediaType.APPLICATION_JSON_VALUE)
     @ResponseStatus(HttpStatus.OK)
     public SystemStatus healthCheck() {
-        SystemStatus systemStatus = new SystemStatus();
-        systemStatus.setHealthStatus(HealthStatus.OK);
-        return systemStatus;
+        return this.terraformExecutor.tfHealthCheck();
     }
 
     /**

src/main/java/org/eclipse/xpanse/terraform/boot/models/exceptions/TerraformApiExceptionHandler.java

@@ -92,4 +92,16 @@ public Response handleHttpMessageConversionException(HttpMessageConversionExcept
         return Response.errorResponse(ResultType.BAD_PARAMETERS,
                 Collections.singletonList(failMessage));
     }
+
+    /**
+     * Exception handler for TerraformHealthCheckException.
+     */
+    @ExceptionHandler({TerraformHealthCheckException.class})
+    @ResponseStatus(HttpStatus.SERVICE_UNAVAILABLE)
+    public Response handleTerraformHealthCheckException(TerraformHealthCheckException ex) {
+        log.error("TerraformHealthCheckException: ", ex);
+        String failMessage = ex.getMessage();
+        return Response.errorResponse(ResultType.SERVICE_UNAVAILABLE,
+                Collections.singletonList(failMessage));
+    }
 }

src/main/java/org/eclipse/xpanse/terraform/boot/models/exceptions/TerraformHealthCheckException.java

@@ -0,0 +1,16 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ * SPDX-FileCopyrightText: Huawei Inc.
+ */
+
+package org.eclipse.xpanse.terraform.boot.models.exceptions;
+
+/**
+ * Used to indicate Terraform health check anomalies.
+ */
+public class TerraformHealthCheckException extends RuntimeException {
+
+    public TerraformHealthCheckException(String message) {
+        super(message);
+    }
+}

src/main/java/org/eclipse/xpanse/terraform/boot/models/response/ResultType.java

@@ -44,7 +44,8 @@ public enum ResultType {
     ACCESS_DENIED("Access Denied"),
     SENSITIVE_FIELD_ENCRYPTION_DECRYPTION_EXCEPTION("Sensitive "
             + "Field Encryption Or Decryption Failed Exception"),
-    UNSUPPORTED_ENUM_VALUE("Unsupported Enum Value");
+    UNSUPPORTED_ENUM_VALUE("Unsupported Enum Value"),
+    SERVICE_UNAVAILABLE("Service Unavailable");
 
     private final String value;
 

src/main/java/org/eclipse/xpanse/terraform/boot/terraform/TerraformExecutor.java

@@ -10,15 +10,20 @@
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import java.io.File;
+import java.io.FileWriter;
 import java.io.IOException;
 import java.nio.file.Files;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Objects;
+import java.util.UUID;
 import lombok.NonNull;
 import lombok.extern.slf4j.Slf4j;
+import org.eclipse.xpanse.terraform.boot.models.SystemStatus;
+import org.eclipse.xpanse.terraform.boot.models.enums.HealthStatus;
 import org.eclipse.xpanse.terraform.boot.models.exceptions.TerraformExecutorException;
+import org.eclipse.xpanse.terraform.boot.models.exceptions.TerraformHealthCheckException;
 import org.eclipse.xpanse.terraform.boot.models.request.TerraformDeployRequest;
 import org.eclipse.xpanse.terraform.boot.models.request.TerraformDestroyRequest;
 import org.eclipse.xpanse.terraform.boot.models.request.async.TerraformAsyncDeployRequest;
@@ -41,6 +46,13 @@
 public class TerraformExecutor {
     private static final String VARS_FILE_NAME = "variables.tfvars.json";
     private static final ObjectMapper OBJECT_MAPPER = new ObjectMapper();
+    private static final String TEST_FILE_NAME = "hello-world.tf";
+    private static final String HEALTH_CHECK_DIR = UUID.randomUUID().toString();
+    private static final String HELLO_WORLD_TEMPLATE = """
+            output "hello_world" {
+                value = "Hello, World!"
+            }
+            """;
 
     static {
         OBJECT_MAPPER.setSerializationInclusion(JsonInclude.Include.NON_NULL);
@@ -254,6 +266,37 @@ public TerraformValidationResult tfValidate(String moduleDirectory) {
         }
     }
 
+    /**
+     * Perform Terraform health checks by creating a Terraform test configuration file.
+     *
+     * @return SystemStatus.
+     */
+    public SystemStatus tfHealthCheck() {
+        String filePath = getModuleFullPath(HEALTH_CHECK_DIR) + File.separator
+                + TEST_FILE_NAME;
+        try {
+            File file = new File(filePath);
+            if (!file.exists()) {
+                file.getParentFile().mkdirs();
+                file.createNewFile();
+            }
+            FileWriter writer = new FileWriter(filePath);
+            writer.write(HELLO_WORLD_TEMPLATE);
+            writer.close();
+        } catch (IOException e) {
+            throw new TerraformHealthCheckException(
+                    "Error creating or writing to file '" + filePath + "': " + e.getMessage());
+        }
+        TerraformValidationResult terraformValidationResult = tfValidate(HEALTH_CHECK_DIR);
+        SystemStatus systemStatus = new SystemStatus();
+        if (terraformValidationResult.isValid()) {
+            systemStatus.setHealthStatus(HealthStatus.OK);
+            return systemStatus;
+        }
+        systemStatus.setHealthStatus(HealthStatus.NOK);
+        return systemStatus;
+    }
+
     private String getModuleFullPath(String moduleDirectory) {
         return this.moduleParentDirectoryPath + File.separator + moduleDirectory;
     }