Refactor: Use InputStream.transferTo

solr/core/src/java/org/apache/solr/cli/PostTool.java

@@ -69,6 +69,7 @@
 import org.apache.commons.cli.CommandLine;
 import org.apache.commons.cli.DeprecatedAttributes;
 import org.apache.commons.cli.Option;
+import org.apache.commons.io.output.NullOutputStream;
 import org.apache.solr.client.api.util.SolrVersion;
 import org.apache.solr.client.solrj.SolrClient;
 import org.apache.solr.client.solrj.SolrServerException;
@@ -1054,16 +1055,12 @@ public static InputStream stringToStream(String s) {
    * source and thrown away.
    */
   private static void pipe(InputStream source, OutputStream dest) throws IOException {
-    byte[] buf = new byte[1024];
-    int read = 0;
-    while ((read = source.read(buf)) >= 0) {
-      if (null != dest) {
-        dest.write(buf, 0, read);
-      }
-    }
-    if (null != dest) {
-      dest.flush();
+    if (dest == null) {
+      dest = NullOutputStream.INSTANCE;
     }
+    // copy source to dest
+    source.transferTo(dest);
+    dest.flush();
   }
 
   public FileFilter getFileFilterFromFileTypes(String fileTypes) {

solr/core/src/java/org/apache/solr/handler/BlobHandler.java

@@ -26,6 +26,7 @@
 import java.io.InputStream;
 import java.io.OutputStream;
 import java.lang.invoke.MethodHandles;
+import java.nio.BufferOverflowException;
 import java.nio.ByteBuffer;
 import java.security.MessageDigest;
 import java.util.ArrayList;
@@ -34,6 +35,7 @@
 import java.util.List;
 import java.util.Map;
 import org.apache.commons.codec.binary.Hex;
+import org.apache.commons.io.input.BoundedInputStream;
 import org.apache.lucene.document.Document;
 import org.apache.lucene.index.IndexableField;
 import org.apache.lucene.index.Term;
@@ -111,8 +113,8 @@ public void handleRequestBody(final SolrQueryRequest req, SolrQueryResponse rsp)
 
       for (ContentStream stream : req.getContentStreams()) {
         ByteBuffer payload;
-        try (InputStream is = stream.getStream()) {
-          payload = Utils.toByteArray(is, maxSize);
+        try (InputStream is = boundedInputStream(stream.getStream(), maxSize)) {
+          payload = Utils.toByteArray(is);
         }
         MessageDigest m = MessageDigest.getInstance("MD5");
         m.update(payload.array(), payload.arrayOffset() + payload.position(), payload.limit());
@@ -261,6 +263,16 @@ public void write(OutputStream os) throws IOException {
     }
   }
 
+  private static InputStream boundedInputStream(final InputStream is, final long maxLength)
+      throws IOException {
+    return new BoundedInputStream(is, maxLength) {
+      @Override
+      protected void onMaxLength(long maxLength, long count) {
+        throw new BufferOverflowException();
+      }
+    };
+  }
+
   private void verifyWithRealtimeGet(
       String blobName, long version, SolrQueryRequest req, Map<String, Object> doc) {
     for (; ; ) {

solr/core/src/java/org/apache/solr/handler/designer/DefaultSampleDocumentsLoader.java

@@ -21,9 +21,7 @@
 import static org.apache.solr.handler.loader.CSVLoaderBase.SEPARATOR;
 
 import java.io.BufferedReader;
-import java.io.ByteArrayOutputStream;
 import java.io.IOException;
-import java.io.InputStream;
 import java.io.Reader;
 import java.io.StringReader;
 import java.lang.invoke.MethodHandles;
@@ -65,14 +63,11 @@ public class DefaultSampleDocumentsLoader implements SampleDocumentsLoader {
   private static final int MAX_STREAM_SIZE = (5 * 1024 * 1024);
   private static final Logger log = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
 
-  public static byte[] streamAsBytes(final InputStream in) throws IOException {
-    ByteArrayOutputStream baos = new ByteArrayOutputStream();
-    byte[] buf = new byte[1024];
-    int r;
-    try (in) {
-      while ((r = in.read(buf)) != -1) baos.write(buf, 0, r);
+  /** Reads all bytes from the stream. */
+  private static byte[] readAllBytes(ContentStream cs) throws IOException {
+    try (var is = cs.getStream()) {
+      return is.readAllBytes();
     }
-    return baos.toByteArray();
   }
 
   @Override
@@ -101,7 +96,7 @@ public SampleDocuments parseDocsFromStream(
       fileSource = stream.getSourceInfo() != null ? stream.getSourceInfo() : "file";
     }
 
-    byte[] uploadedBytes = streamAsBytes(stream.getStream());
+    byte[] uploadedBytes = readAllBytes(stream);
     // recheck the upload size in case the stream returned null for getSize
     if (uploadedBytes.length > MAX_STREAM_SIZE) {
       throw new SolrException(
@@ -208,8 +203,7 @@ protected List<SolrInputDocument> loadJsonDocs(
       String charset = ContentStreamBase.getCharsetFromContentType(stream.getContentType());
       String jsonStr =
           new String(
-              streamAsBytes(stream.getStream()),
-              charset != null ? charset : ContentStreamBase.DEFAULT_CHARSET);
+              readAllBytes(stream), charset != null ? charset : ContentStreamBase.DEFAULT_CHARSET);
       String[] lines = jsonStr.split("\n");
       if (lines.length > 1) {
         for (String line : lines) {
@@ -239,7 +233,7 @@ protected List<SolrInputDocument> loadJsonDocs(
   protected List<SolrInputDocument> loadXmlDocs(
       SolrParams params, ContentStreamBase.ByteArrayStream stream, final int maxDocsToLoad)
       throws IOException {
-    String xmlString = readInputAsString(stream.getStream()).trim();
+    String xmlString = new String(readAllBytes(stream), StandardCharsets.UTF_8).trim();
     List<SolrInputDocument> docs;
     if (xmlString.contains("<add>") && xmlString.contains("<doc>")) {
       XMLInputFactory inputFactory = XMLInputFactory.newInstance();
@@ -320,10 +314,6 @@ protected List<Map<String, Object>> loadJsonLines(String[] lines) throws IOExcep
     return docs;
   }
 
-  protected String readInputAsString(InputStream in) throws IOException {
-    return new String(streamAsBytes(in), StandardCharsets.UTF_8);
-  }
-
   protected char detectTSV(String csvStr) {
     char sep = ',';
     int endOfFirstLine = csvStr.indexOf('\n');

solr/core/src/java/org/apache/solr/handler/designer/SchemaDesignerAPI.java

@@ -241,9 +241,10 @@ public void updateFileContents(SolrQueryRequest req, SolrQueryResponse rsp)
           "File '" + file + "' not found in configSet: " + configSet);
     }
 
-    byte[] data =
-        DefaultSampleDocumentsLoader.streamAsBytes(
-            extractSingleContentStream(req, true).getStream());
+    byte[] data;
+    try (InputStream in = extractSingleContentStream(req, true).getStream()) {
+      data = in.readAllBytes();
+    }
     Exception updateFileError = null;
     boolean requestIsTrusted =
         ConfigSetAPIBase.isTrusted(req.getUserPrincipal(), coreContainer.getAuthenticationPlugin());

solr/core/src/java/org/apache/solr/handler/designer/SchemaDesignerConfigSetHelper.java

@@ -65,6 +65,7 @@
 import org.apache.http.client.utils.URLEncodedUtils;
 import org.apache.http.entity.ByteArrayEntity;
 import org.apache.http.util.EntityUtils;
+import org.apache.lucene.util.IOSupplier;
 import org.apache.solr.client.solrj.SolrResponse;
 import org.apache.solr.client.solrj.SolrServerException;
 import org.apache.solr.client.solrj.impl.CloudLegacySolrClient;
@@ -542,12 +543,12 @@ List<SolrInputDocument> getStoredSampleDocs(final String configSet) throws IOExc
           ((CloudLegacySolrClient) cloudClient()).getHttpClient().execute(httpGet);
       int statusCode = entity.getStatusLine().getStatusCode();
       if (statusCode == HttpStatus.SC_OK) {
-        byte[] bytes = DefaultSampleDocumentsLoader.streamAsBytes(entity.getEntity().getContent());
+        byte[] bytes = readAllBytes(() -> entity.getEntity().getContent());
         if (bytes.length > 0) {
           docs = (List<SolrInputDocument>) Utils.fromJavabin(bytes);
         }
       } else if (statusCode != HttpStatus.SC_NOT_FOUND) {
-        byte[] bytes = DefaultSampleDocumentsLoader.streamAsBytes(entity.getEntity().getContent());
+        byte[] bytes = readAllBytes(() -> entity.getEntity().getContent());
         throw new IOException(
             "Failed to lookup stored docs for "
                 + configSet
@@ -562,10 +563,14 @@ List<SolrInputDocument> getStoredSampleDocs(final String configSet) throws IOExc
 
   void storeSampleDocs(final String configSet, List<SolrInputDocument> docs) throws IOException {
     docs.forEach(d -> d.removeField(VERSION_FIELD)); // remove _version_ field before storing ...
-    postDataToBlobStore(
-        cloudClient(),
-        configSet + "_sample",
-        DefaultSampleDocumentsLoader.streamAsBytes(toJavabin(docs)));
+    postDataToBlobStore(cloudClient(), configSet + "_sample", readAllBytes(() -> toJavabin(docs)));
+  }
+
+  /** Gets the stream, reads all the bytes, closes the stream. */
+  static byte[] readAllBytes(IOSupplier<InputStream> hasStream) throws IOException {
+    try (InputStream in = hasStream.get()) {
+      return in.readAllBytes();
+    }
   }
 
   protected void postDataToBlobStore(CloudSolrClient cloudClient, String blobName, byte[] bytes)

solr/core/src/test/org/apache/solr/cloud/TestConfigSetsAPI.java

@@ -1754,14 +1754,7 @@ private static void zipWithForbiddenEndings(File fileOrDirectory, File zipfile)
           zout.putNextEntry(new ZipEntry("test." + fileType));
 
           try (InputStream in = new FileInputStream(fileOrDirectory)) {
-            byte[] buffer = new byte[1024];
-            while (true) {
-              int readCount = in.read(buffer);
-              if (readCount < 0) {
-                break;
-              }
-              zout.write(buffer, 0, readCount);
-            }
+            in.transferTo(zout);
           }
 
           zout.closeEntry();
@@ -1783,8 +1776,7 @@ private static void zip(File directory, File zipfile) throws IOException {
     Deque<File> queue = new ArrayDeque<>();
     queue.push(directory);
     OutputStream out = new FileOutputStream(zipfile);
-    ZipOutputStream zout = new ZipOutputStream(out);
-    try {
+    try (ZipOutputStream zout = new ZipOutputStream(out)) {
       while (!queue.isEmpty()) {
         directory = queue.pop();
         for (File kid : directory.listFiles()) {
@@ -1796,26 +1788,14 @@ private static void zip(File directory, File zipfile) throws IOException {
           } else {
             zout.putNextEntry(new ZipEntry(name));
 
-            InputStream in = new FileInputStream(kid);
-            try {
-              byte[] buffer = new byte[1024];
-              while (true) {
-                int readCount = in.read(buffer);
-                if (readCount < 0) {
-                  break;
-                }
-                zout.write(buffer, 0, readCount);
-              }
-            } finally {
-              in.close();
+            try (InputStream in = new FileInputStream(kid)) {
+              in.transferTo(zout);
             }
 
             zout.closeEntry();
           }
         }
       }
-    } finally {
-      zout.close();
     }
   }
 

solr/core/src/test/org/apache/solr/handler/designer/TestSchemaDesignerConfigSetHelper.java

@@ -256,7 +256,7 @@ public void testPersistSampleDocs() throws Exception {
     helper.postDataToBlobStore(
         cluster.getSolrClient(),
         configSet + "_sample",
-        DefaultSampleDocumentsLoader.streamAsBytes(toJavabin(Collections.singletonList(doc))));
+        SchemaDesignerConfigSetHelper.readAllBytes(() -> toJavabin(List.of(doc))));
 
     List<SolrInputDocument> docs = helper.getStoredSampleDocs(configSet);
     assertTrue(docs != null && docs.size() == 1);

solr/core/src/test/org/apache/solr/util/TestCborDataFormat.java

@@ -139,22 +139,13 @@ private byte[] runQuery(String testCollection, CloudSolrClient client, String wt
       request.setResponseParser(new InputStreamResponseParser(wt));
     }
     result = client.request(request, testCollection);
-    byte[] b = copyStream((InputStream) result.get("stream"));
+    InputStream inputStream = (InputStream) result.get("stream");
+    byte[] b = inputStream.readAllBytes();
     System.out.println(wt + "_time : " + timer.getTime());
     System.out.println(wt + "_size : " + b.length);
     return b;
   }
 
-  private static byte[] copyStream(InputStream inputStream) throws IOException {
-    ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
-    byte[] buffer = new byte[4096];
-    int bytesRead;
-    while ((bytesRead = inputStream.read(buffer)) != -1) {
-      outputStream.write(buffer, 0, bytesRead);
-    }
-    return outputStream.toByteArray();
-  }
-
   private void modifySchema(String testCollection, CloudSolrClient client)
       throws SolrServerException, IOException {
     GenericSolrRequest req =