Add disposable key clean logic

spring-cloud-starter-tencent-metadata-transfer/src/main/java/com/tencent/cloud/metadata/core/DecodeTransferMetadataServletFilter.java

@@ -63,15 +63,10 @@ public class DecodeTransferMetadataServletFilter extends OncePerRequestFilter {
 		mergedTransitiveMetadata.putAll(internalTransitiveMetadata);
 		mergedTransitiveMetadata.putAll(customTransitiveMetadata);
 
-		try {
 		MetadataContextHolder.init(mergedTransitiveMetadata);
 
 		filterChain.doFilter(httpServletRequest, httpServletResponse);
 	}
-		catch (IOException | ServletException | RuntimeException e) {
-			throw e;
-		}
-	}
 
 	private Map<String, String> getInternalTransitiveMetadata(HttpServletRequest httpServletRequest) {
 		// Get custom metadata string from http header.

spring-cloud-tencent-commons/src/main/java/com/tencent/cloud/common/metadata/MetadataContextHolder.java

@@ -20,12 +20,21 @@ package com.tencent.cloud.common.metadata;
 
 import java.util.Collections;
 import java.util.HashMap;
+import java.util.Iterator;
 import java.util.Map;
 
 import com.tencent.cloud.common.metadata.config.MetadataLocalProperties;
 import com.tencent.cloud.common.util.ApplicationContextAwareUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import org.springframework.util.CollectionUtils;
+import org.springframework.util.StringUtils;
+
+import static com.tencent.cloud.common.constant.ContextConstant.UTF_8;
+import static com.tencent.cloud.common.constant.MetadataConstant.INTERNAL_METADATA_DISPOSABLE;
+import static com.tencent.cloud.common.util.JacksonUtils.deserialize2Map;
+import static java.net.URLDecoder.decode;
 
 /**
  * Metadata Context Holder.
@@ -34,6 +43,8 @@ import org.springframework.util.CollectionUtils;
  */
 public final class MetadataContextHolder {
 
+	private static final Logger LOGGER = LoggerFactory.getLogger(MetadataContextHolder.class);
+
 	private static final ThreadLocal<MetadataContext> METADATA_CONTEXT = new InheritableThreadLocal<>();
 
 	private static MetadataLocalProperties metadataLocalProperties;
@@ -89,6 +100,34 @@ public final class MetadataContextHolder {
 
 		// Save transitive metadata to ThreadLocal.
 		if (!CollectionUtils.isEmpty(dynamicTransitiveMetadata)) {
+
+			// processing disposable keys
+			if (dynamicTransitiveMetadata.containsKey(INTERNAL_METADATA_DISPOSABLE)) {
+				String disposableKeyStatus = dynamicTransitiveMetadata.get(INTERNAL_METADATA_DISPOSABLE);
+				try {
+					if (StringUtils.hasText(disposableKeyStatus)) {
+						Map<String, String> keyStatus = deserialize2Map(decode(disposableKeyStatus, UTF_8));
+						Iterator<Map.Entry<String, String>> it = keyStatus.entrySet().iterator();
+						while (it.hasNext()) {
+							Map.Entry<String, String> entry = it.next();
+							String key = entry.getKey();
+							boolean status = Boolean.parseBoolean(entry.getValue());
+							if (!status) {
+								keyStatus.put(key, "true");
+							}
+							else {
+								// removed disposable key
+								dynamicTransitiveMetadata.remove(key);
+								it.remove();
+							}
+						}
+					}
+				}
+				catch (Exception e) {
+					LOGGER.error("Runtime system does not support utf-8 coding.", e);
+				}
+			}
+
 			Map<String, String> staticTransitiveMetadata =
 					metadataContext.getFragmentContext(MetadataContext.FRAGMENT_TRANSITIVE);
 			Map<String, String> mergedTransitiveMetadata = new HashMap<>();