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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CLOUDSTACK-10146) Bypass Secondary Storage for KVM templates
Date Thu, 04 Jan 2018 13:14:00 GMT

    [ https://issues.apache.org/jira/browse/CLOUDSTACK-10146?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16311317#comment-16311317
] 

ASF GitHub Bot commented on CLOUDSTACK-10146:
---------------------------------------------

marcaurele commented on a change in pull request #2379: CLOUDSTACK-10146: Bypass Secondary
Storage for KVM templates
URL: https://github.com/apache/cloudstack/pull/2379#discussion_r159648592
 
 

 ##########
 File path: agent/src/com/cloud/agent/direct/download/HttpDirectTemplateDownloader.java
 ##########
 @@ -0,0 +1,158 @@
+//
+// 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 com.cloud.agent.direct.download;
+
+import com.cloud.utils.exception.CloudRuntimeException;
+import org.apache.commons.httpclient.Header;
+import org.apache.commons.httpclient.HttpClient;
+import org.apache.commons.httpclient.HttpMethod;
+import org.apache.commons.httpclient.HttpMethodRetryHandler;
+import org.apache.commons.httpclient.MultiThreadedHttpConnectionManager;
+import org.apache.commons.httpclient.NoHttpResponseException;
+import org.apache.commons.httpclient.methods.GetMethod;
+import org.apache.commons.httpclient.params.HttpMethodParams;
+import org.apache.log4j.Logger;
+
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.RandomAccessFile;
+import java.util.Map;
+
+public class HttpDirectTemplateDownloader extends DirectTemplateDownloaderImpl {
+
+    private HttpClient client;
+    private static final MultiThreadedHttpConnectionManager s_httpClientManager = new MultiThreadedHttpConnectionManager();
+    private static final int CHUNK_SIZE = 1024 * 1024; //1M
+    private final HttpMethodRetryHandler myretryhandler;
+    public static final Logger s_logger = Logger.getLogger(HttpDirectTemplateDownloader.class.getName());
+    private GetMethod request;
+    private long remoteSize;
+
+    public HttpDirectTemplateDownloader(String url, Long templateId, String destPoolPath,
String checksum, Map<String, String> headers) {
+        super(url, destPoolPath, templateId, checksum);
+        client = new HttpClient(s_httpClientManager);
+        myretryhandler = createRetryTwiceHandler();
+        request = createRequest(url, headers);
+        String downloadDir = getDirectDownloadTempPath(templateId);
+        createTemporaryDirectoryAndFile(downloadDir);
+    }
+
+    private void createTemporaryDirectoryAndFile(String downloadDir) {
+        createFolder(getDestPoolPath() + File.separator + downloadDir);
+        File f = new File(getDestPoolPath() + File.separator + downloadDir + File.separator
+ getFileNameFromUrl());
+        setDownloadedFilePath(f.getAbsolutePath());
+    }
+
+    private GetMethod createRequest(String downloadUrl, Map<String, String> headers)
{
+        GetMethod request = new GetMethod(downloadUrl);
+        request.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, myretryhandler);
+        request.setFollowRedirects(true);
+        for (String key : headers.keySet()) {
+            request.setRequestHeader(key, headers.get(key));
+        }
+        return request;
+    }
+
+    private long getRemoteSize(GetMethod request) {
+        Header contentLengthHeader = request.getResponseHeader("Content-Length");
+        long reportedRemoteSize = 0;
+        if (contentLengthHeader == null) {
+            Header chunkedHeader = request.getResponseHeader("Transfer-Encoding");
+            if (chunkedHeader == null || !"chunked".equalsIgnoreCase(chunkedHeader.getValue()))
{
+                throw new CloudRuntimeException("Error template remote size");
+            }
+        } else {
+            reportedRemoteSize = Long.parseLong(contentLengthHeader.getValue());
+        }
+        return reportedRemoteSize;
+    }
+
+    private HttpMethodRetryHandler createRetryTwiceHandler() {
+        return new HttpMethodRetryHandler() {
+            @Override
+            public boolean retryMethod(final HttpMethod method, final IOException exception,
int executionCount) {
+                if (executionCount >= 2) {
+                    // Do not retry if over max retry count
+                    return false;
+                }
+                if (exception instanceof NoHttpResponseException) {
+                    // Retry if the server dropped connection on us
+                    return true;
+                }
+                if (!method.isRequestSent()) {
+                    // Retry if the request has not been sent fully or
+                    // if it's OK to retry methods that have been sent
+                    return true;
+                }
+                // otherwise do not retry
+                return false;
+            }
+        };
+    }
+
+    @Override
+    public boolean downloadTemplate() {
+        InputStream in = null;
+        RandomAccessFile out = null;
+        try {
+            client.executeMethod(request);
+            remoteSize = getRemoteSize(request);
 
 Review comment:
   Since you're using this info in the `copyBytes` method, this is overkill. It can even throw
an exception but having the filesize isn't mandatory to download it. This information, if
present in the header, should be used as a *nice to have* but the download **must work** without
this info as @wido pointed that some servers don't send this information in the header (https://github.com/apache/cloudstack/pull/1934#issuecomment-347784289).
So it must be changed

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> Bypass Secondary Storage for KVM templates
> ------------------------------------------
>
>                 Key: CLOUDSTACK-10146
>                 URL: https://issues.apache.org/jira/browse/CLOUDSTACK-10146
>             Project: CloudStack
>          Issue Type: Bug
>      Security Level: Public(Anyone can view this level - this is the default.) 
>    Affects Versions: 4.11.0.0
>            Reporter: Nicolas Vazquez
>            Assignee: Nicolas Vazquez
>




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