| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache license, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the license for the specific language governing permissions and |
| * limitations under the license. |
| */ |
| package org.apache.logging.log4j.layout.template.json.resolver; |
| |
| import org.apache.logging.log4j.layout.template.json.util.TruncatingBufferedPrintWriter; |
| import org.apache.logging.log4j.layout.template.json.util.JsonWriter; |
| import org.apache.logging.log4j.layout.template.json.util.Recycler; |
| |
| import java.util.List; |
| import java.util.function.Supplier; |
| import java.util.regex.Matcher; |
| import java.util.regex.Pattern; |
| import java.util.stream.Collectors; |
| |
| /** |
| * Exception stack trace to JSON string resolver used by {@link ExceptionResolver}. |
| */ |
| final class StackTraceStringResolver implements StackTraceResolver { |
| |
| private final Recycler<TruncatingBufferedPrintWriter> writerRecycler; |
| |
| private final boolean truncationEnabled; |
| |
| private final String truncationSuffix; |
| |
| private final List<String> truncationPointMatcherStrings; |
| |
| private final List<Pattern> groupedTruncationPointMatcherRegexes; |
| |
| StackTraceStringResolver( |
| final EventResolverContext context, |
| final String truncationSuffix, |
| final List<String> truncationPointMatcherStrings, |
| final List<String> truncationPointMatcherRegexes) { |
| final Supplier<TruncatingBufferedPrintWriter> writerSupplier = |
| () -> TruncatingBufferedPrintWriter.ofCapacity( |
| context.getMaxStringByteCount()); |
| this.writerRecycler = context |
| .getRecyclerFactory() |
| .create(writerSupplier, TruncatingBufferedPrintWriter::close); |
| this.truncationEnabled = |
| !truncationPointMatcherStrings.isEmpty() || |
| !truncationPointMatcherRegexes.isEmpty(); |
| this.truncationSuffix = truncationSuffix; |
| this.truncationPointMatcherStrings = truncationPointMatcherStrings; |
| this.groupedTruncationPointMatcherRegexes = |
| groupTruncationPointMatcherRegexes(truncationPointMatcherRegexes); |
| } |
| |
| private static List<Pattern> groupTruncationPointMatcherRegexes( |
| final List<String> regexes) { |
| return regexes |
| .stream() |
| .map(regex -> Pattern.compile( |
| "^.*(" + regex + ")(.*)$", |
| Pattern.MULTILINE | Pattern.DOTALL)) |
| .collect(Collectors.toList()); |
| } |
| |
| @Override |
| public void resolve( |
| final Throwable throwable, |
| final JsonWriter jsonWriter) { |
| final TruncatingBufferedPrintWriter writer = writerRecycler.acquire(); |
| try { |
| throwable.printStackTrace(writer); |
| truncate(writer); |
| jsonWriter.writeString(writer.buffer(), 0, writer.position()); |
| } finally { |
| writerRecycler.release(writer); |
| } |
| } |
| |
| private void truncate(final TruncatingBufferedPrintWriter writer) { |
| |
| // Short-circuit if truncation is not enabled. |
| if (!truncationEnabled) { |
| return; |
| } |
| |
| // Check for string matches. |
| // noinspection ForLoopReplaceableByForEach (avoid iterator allocation) |
| for (int i = 0; i < truncationPointMatcherStrings.size(); i++) { |
| final String matcher = truncationPointMatcherStrings.get(i); |
| final int matchIndex = writer.indexOf(matcher); |
| if (matchIndex > 0) { |
| final int truncationPointIndex = matchIndex + matcher.length(); |
| truncate(writer, truncationPointIndex); |
| return; |
| } |
| } |
| |
| // Check for regex matches. |
| // noinspection ForLoopReplaceableByForEach (avoid iterator allocation) |
| for (int i = 0; i < groupedTruncationPointMatcherRegexes.size(); i++) { |
| final Pattern pattern = groupedTruncationPointMatcherRegexes.get(i); |
| final Matcher matcher = pattern.matcher(writer); |
| final boolean matched = matcher.matches(); |
| if (matched) { |
| final int lastGroup = matcher.groupCount(); |
| final int truncationPointIndex = matcher.start(lastGroup); |
| truncate(writer, truncationPointIndex); |
| return; |
| } |
| } |
| |
| } |
| |
| private void truncate( |
| final TruncatingBufferedPrintWriter writer, |
| final int index) { |
| writer.position(index); |
| writer.print(truncationSuffix); |
| } |
| |
| } |