CEPH篇 CEPH接口（S3）

引入

　　CEPH对于他的块设备，文件系统和对象存储都提供了多样的接口。官文介绍还算详细，这里没用到的就不记录了，网址：http://docs.ceph.org.cn

　　不过中文地址介绍的版本比较旧，要看新的介绍：https://docs.ceph.com/docs/master/

S3接口例子

　　例子包含几项操作：

　　　　1.连接CEPH

　　　　2.创建桶（bucket）

　　　　3.上传对象（文件）

　　　　4.下载对象（文件）

　　　　5.删除对象（文件）

　　　　6.删除桶

package com.newland.ceph;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.util.UUID;

import com.amazonaws.AmazonClientException;
import com.amazonaws.AmazonServiceException;
import com.amazonaws.ClientConfiguration;
import com.amazonaws.Protocol;
import com.amazonaws.auth.AWSCredentials;
import com.amazonaws.auth.AWSStaticCredentialsProvider;
import com.amazonaws.services.s3.AmazonS3;
import com.amazonaws.services.s3.AmazonS3Client;
import com.amazonaws.services.s3.AmazonS3ClientBuilder;
import com.amazonaws.services.s3.model.Bucket;
import com.amazonaws.services.s3.model.GetObjectRequest;
import com.amazonaws.services.s3.model.PutObjectRequest;
import com.amazonaws.services.s3.model.S3Object;

import com.amazonaws.auth.BasicAWSCredentials;
import com.amazonaws.client.builder.AwsClientBuilder;

public class CephS3UtilsTest {
    
    //服务器
    public static String accessKey = "P6V7K1979A44B4X8QSJD";
    public static String secretKey = "QBMAkpg0FYMdXRahoU5OQkiUNDT2GzymJ2Rem1tz";
    public static String endPoint = "http://10.1.12.170:7480";

    public static String bucketName = "ptam.test";// + UUID.randomUUID();
    public static String key = "MyObjectKey" + UUID.randomUUID();
    public static AmazonS3 s3Conn = null;
    
    public static void main(String[] args) throws IOException, InterruptedException {

        System.out.println("===========================================");
        System.out.println("Getting Started with Amazon S3");
        System.out.println("===========================================
");

        try {
            ConnConfig cfg = new ConnConfig();
            cfg.setAccessKey(accessKey);
            cfg.setSecretKey(secretKey);
            cfg.setEndPoint(endPoint);
            cfg.setBucketName(bucketName);

            /**
             * 创建桶
             * 上传对象（文件）
             * 下载文件
             * 删除对象
             * 删除桶
             */
            createBucket(cfg);

            uploadObject(cfg, key, createSampleFile());
            displayTextInputStream(downloadObject(cfg, key));
            Thread.sleep(1000);

            deleteObject(cfg, key);
            deleteBucket(cfg);
        } catch (AmazonServiceException ase) {
            System.out.println("Caught an AmazonServiceException, which means your request made it "
                    + "to Amazon S3, but was rejected with an error response for some reason.");
            System.out.println("Error Message:    " + ase.getMessage());
            System.out.println("HTTP Status Code: " + ase.getStatusCode());
            System.out.println("AWS Error Code:   " + ase.getErrorCode());
            System.out.println("Error Type:       " + ase.getErrorType());
            System.out.println("Request ID:       " + ase.getRequestId());
        } catch (AmazonClientException ace) {
            System.out.println("Caught an AmazonClientException, which means the client encountered "
                    + "a serious internal problem while trying to communicate with S3, "
                    + "such as not being able to access the network.");
            System.out.println("Error Message: " + ace.getMessage());
        }
    }

    /**
     * Creates a temporary file with text data to demonstrate uploading a file
     * to Amazon S3
     *
     * @return A newly created temporary file with text data.
     *
     * @throws IOException
     */
    private static File createSampleFile() throws IOException {
        File file = File.createTempFile("aws-java-sdk-", ".txt");
        file.deleteOnExit();

        Writer writer = new OutputStreamWriter(new FileOutputStream(file));
        writer.write("abcdefghijklmnopqrstuvwxyz
");
        writer.write("01234567890112345678901235
");
        writer.write("!@#$%^&*()-=[]{};':',.<>/?
");
        writer.write("01234567890112345678901234
");
        writer.write("abcdefghijklmnopqrstuvwxyz
");
        writer.close();

        return file;
    }

    /**
     * Displays the contents of the specified input stream as text.
     *
     * @param input
     *            The input stream to display as text.
     *
     * @throws IOException
     */
    private static void displayTextInputStream(InputStream input) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(input));
        while (true) {
            String line = reader.readLine();
            if (line == null) break;

            System.out.println("    " + line);
        }
        System.out.println();
    }
    
    private static AmazonS3 getAmazonS3() {
        if (s3Conn == null) {
            AWSCredentials credentials = new BasicAWSCredentials(accessKey, secretKey);
            s3Conn = AmazonS3ClientBuilder.standard().withCredentials(new AWSStaticCredentialsProvider(credentials))
                .withEndpointConfiguration(new AwsClientBuilder.EndpointConfiguration(endPoint, "")).build();
            System.out.println(s3Conn);
        }
        return s3Conn;
    }
    
    private static void init(ConnConfig cfg) {
        accessKey = cfg.getAccessKey();
        secretKey = cfg.getSecretKey();
        endPoint = cfg.getEndPoint();
        bucketName = cfg.getBucketName();
    }
    static class ConnConfig{
        private String accessKey;
        private String secretKey;
        private String endPoint;
        private String bucketName;

        public String getAccessKey() {
            return accessKey;
        }

        public void setAccessKey(String accessKey) {
            this.accessKey = accessKey;
        }

        public String getSecretKey() {
            return secretKey;
        }

        public void setSecretKey(String secretKey) {
            this.secretKey = secretKey;
        }

        public String getEndPoint() {
            return endPoint;
        }

        public void setEndPoint(String endPoint) {
            this.endPoint = endPoint;
        }

        public String getBucketName() {
            return bucketName;
        }

        public void setBucketName(String bucketName) {
            this.bucketName = bucketName;
        }
    }
    
    private static AmazonS3 getAmazonS32() {
        AWSCredentials credentials = null; 

        try {
            credentials = new BasicAWSCredentials(accessKey, secretKey);
        } catch (Exception e) {
            throw new AmazonClientException(
                    "Cannot load the credentials from the credential profiles file. " +
                    "Please make sure that your credentials file is at the correct " +
                    "location (~/.aws/credentials), and is in valid format.",
                    e);
        }

        ClientConfiguration clientConfig = new ClientConfiguration();
        clientConfig.setProtocol(Protocol.HTTP);
        clientConfig.setSignerOverride("S3SignerType");

        AmazonS3 s3 = new AmazonS3Client(credentials, clientConfig);
        s3.setEndpoint(endPoint);
        
        return s3;
    }
    
    public static void createBucket(ConnConfig cfg) {
        try {
            init(cfg);
            System.out.println("Listing buckets");
            for (Bucket bucket : getAmazonS3().listBuckets()) {
                System.out.println(" - " + bucket.getName());
                if(bucketName.equals(bucket.getName()))
                    return;
            }
            System.out.println("Creating bucket " + bucketName + "
");
            Bucket bucket = getAmazonS3().createBucket(bucketName);
        }  catch (AmazonServiceException ase) {
            System.out.println("Caught an AmazonServiceException, which means your request made it "
                    + "to Amazon S3, but was rejected with an error response for some reason.");
            System.out.println("Error Message:    " + ase.getMessage());
            System.out.println("HTTP Status Code: " + ase.getStatusCode());
            System.out.println("AWS Error Code:   " + ase.getErrorCode());
            System.out.println("Error Type:       " + ase.getErrorType());
            System.out.println("Request ID:       " + ase.getRequestId());
        } catch (AmazonClientException ace) {
            System.out.println("Caught an AmazonClientException, which means the client encountered "
                    + "a serious internal problem while trying to communicate with S3, "
                    + "such as not being able to access the network.");
            System.out.println("Error Message: " + ace.getMessage());
        }
    }
    
    public static void deleteBucket(ConnConfig cfg) {

        try {
            init(cfg);
              System.out.println("Deleting bucket " + bucketName + "
");
              getAmazonS3().deleteBucket(bucketName);
        }  catch (AmazonServiceException ase) {
            System.out.println("Caught an AmazonServiceException, which means your request made it "
                    + "to Amazon S3, but was rejected with an error response for some reason.");
            System.out.println("Error Message:    " + ase.getMessage());
            System.out.println("HTTP Status Code: " + ase.getStatusCode());
            System.out.println("AWS Error Code:   " + ase.getErrorCode());
            System.out.println("Error Type:       " + ase.getErrorType());
            System.out.println("Request ID:       " + ase.getRequestId());
        } catch (AmazonClientException ace) {
            System.out.println("Caught an AmazonClientException, which means the client encountered "
                    + "a serious internal problem while trying to communicate with S3, "
                    + "such as not being able to access the network.");
            System.out.println("Error Message: " + ace.getMessage());
        }
    }
    
    public static Boolean uploadObject(ConnConfig cfg, String key, File file) {
        System.out.println("Uploading a new object to S3 from a file, key=" + key);
        init(cfg);
        getAmazonS3().putObject(new PutObjectRequest(bucketName, key, file));
        
        return true;
    }
    
    public static InputStream downloadObject(ConnConfig cfg, String key) {
        System.out.println("Downloading an object");
        init(cfg);
        S3Object object = getAmazonS3().getObject(new GetObjectRequest(bucketName, key));
        System.out.println("Content-Type: "  + object.getObjectMetadata().getContentType());
        
        return object.getObjectContent();
    }


    public static void downloadObject2(ConnConfig cfg, String key) {
        System.out.println("Downloading an object");
        init(cfg);
        getAmazonS3().getObject(new GetObjectRequest(bucketName, key),new File("bb.eep"));
    }
    
    public static Boolean deleteObject(ConnConfig cfg, String key) {
        try {
            System.out.println("Deleting an object
");
            init(cfg);
            getAmazonS3().deleteObject(bucketName, key);
        }  catch (AmazonServiceException ase) {
            System.out.println("Caught an AmazonServiceException, which means your request made it "
                    + "to Amazon S3, but was rejected with an error response for some reason.");
            System.out.println("Error Message:    " + ase.getMessage());
            System.out.println("HTTP Status Code: " + ase.getStatusCode());
            System.out.println("AWS Error Code:   " + ase.getErrorCode());
            System.out.println("Error Type:       " + ase.getErrorType());
            System.out.println("Request ID:       " + ase.getRequestId());
        } catch (AmazonClientException ace) {
            System.out.println("Caught an AmazonClientException, which means the client encountered "
                    + "a serious internal problem while trying to communicate with S3, "
                    + "such as not being able to access the network.");
            System.out.println("Error Message: " + ace.getMessage());
        }
        return true;
    }

}

　　使用到的pom

  <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>com.amazonaws</groupId>
                <artifactId>aws-java-sdk-bom</artifactId>
                <version>1.11.673</version>

                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>com.amazonaws</groupId>
            <artifactId>aws-java-sdk-s3</artifactId>
        </dependency>
        <dependency>
            <groupId>com.amazonaws</groupId>
            <artifactId>aws-java-sdk-dynamodb</artifactId>
        </dependency>
        <!-- https://mvnrepository.com/artifact/com.ceph/rados -->
        <dependency>
            <groupId>com.ceph</groupId>
            <artifactId>rados</artifactId>
            <version>0.5.0</version>
        </dependency>

　　代码地址在：https://github.com/garfieldcgf/notes/tree/master/ceph