Examples with CanonicalUser com.emc.object.s3.bean.CanonicalUser used on opensource projects

Example 1 with CanonicalUser

use of com.emc.object.s3.bean.CanonicalUser in project pravega by pravega.

the class ExtendedS3Storage method doCreate.

private SegmentProperties doCreate(String streamSegmentName) throws StreamSegmentExistsException {
    long traceId = LoggerHelpers.traceEnter(log, "create", streamSegmentName);
    if (!client.listObjects(config.getBucket(), config.getRoot() + streamSegmentName).getObjects().isEmpty()) {
        throw new StreamSegmentExistsException(streamSegmentName);
    }
    S3ObjectMetadata metadata = new S3ObjectMetadata();
    metadata.setContentLength((long) 0);
    PutObjectRequest request = new PutObjectRequest(config.getBucket(), config.getRoot() + streamSegmentName, null);
    AccessControlList acl = new AccessControlList();
    acl.addGrants(new Grant(new CanonicalUser(config.getAccessKey(), config.getAccessKey()), READ_WRITE_PERMISSION));
    request.setAcl(acl);
    /* Default behavior of putObject is to overwrite an existing object. This behavior can cause data loss.
         * Here is one of the scenarios in which data loss is observed:
         * 1. Host A owns the container and gets a create operation. It has not executed the putObject operation yet.
         * 2. Ownership changes and host B becomes the owner of the container. It picks up putObject from the queue, executes it.
         * 3. Host B gets a write operation which executes successfully.
         * 4. Now host A schedules the putObject. This will overwrite the write by host B.
         *
         * The solution for this issue is to implement put-if-absent behavior by using Set-If-None-Match header as described here:
         * http://www.emc.com/techpubs/api/ecs/v3-0-0-0/S3ObjectOperations_createOrUpdateObject_7916bd6f789d0ae0ff39961c0e660d00_ba672412ac371bb6cf4e69291344510e_detail.htm
         * But this does not work. Currently all the calls to putObject API fail if made with reqest.setIfNoneMatch("*").
         * once the issue with extended S3 API is fixed, addition of this one line will ensure put-if-absent semantics.
         * See: https://github.com/pravega/pravega/issues/1564
         *
         * This issue is fixed in some versions of extended S3 implementation. The following code sets the IfNoneMatch
         * flag based on configuration.
         */
    if (config.isUseNoneMatch()) {
        request.setIfNoneMatch("*");
    }
    client.putObject(request);
    LoggerHelpers.traceLeave(log, "create", traceId);
    return doGetStreamSegmentInfo(streamSegmentName);
}

Example 2 with CanonicalUser

use of com.emc.object.s3.bean.CanonicalUser in project pravega by pravega.

the class ExtendedS3Storage method setPermission.

private void setPermission(SegmentHandle handle, Permission permission) {
    AccessControlList acl = client.getObjectAcl(config.getBucket(), config.getRoot() + handle.getSegmentName());
    acl.getGrants().clear();
    acl.addGrants(new Grant(new CanonicalUser(config.getAccessKey(), config.getAccessKey()), permission));
    client.setObjectAcl(new SetObjectAclRequest(config.getBucket(), config.getRoot() + handle.getSegmentName()).withAcl(acl));
}