Object Storage Service:オブジェクトのコピー

使用上の注意

• このトピックでは、中国 (杭州) リージョンのパブリックエンドポイントを使用します。 OSSと同じリージョンにある他のAlibaba CloudサービスからOSSにアクセスする場合は、内部エンドポイントを使用します。 OSSリージョンとエンドポイントの詳細については、「リージョンとエンドポイント」をご参照ください。

• このトピックでは、OSSエンドポイントを使用してOSSClientインスタンスを作成します。 カスタムドメイン名またはSTS (Security Token Service) を使用してOSSClientインスタンスを作成する場合は、「初期化」をご参照ください。

• CopyObjectまたはUploadPartCopy操作を呼び出して、オブジェクトサイズに基づいてオブジェクトをコピーできます。 オブジェクトサイズの制限の詳細については、「CopyObject」をご参照ください。

小さなオブジェクトをアップロードする

次のコードは、CopyObject操作を呼び出して小さなオブジェクトをコピーする方法の例を示しています。

#include "oss_api.h"
#include "aos_http_io.h"
/* Specify the endpoint of the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the endpoint to https://oss-cn-hangzhou.aliyuncs.com. */
const char *endpoint = "yourEndpoint";
/* Specify the name of the source bucket. */
const char *source_bucket_name = "yourSourceBucketName";
/* Specify the full path of the source object. Do not include the bucket name in the full path. */
const char *source_object_name = "yourSourceObjectName";
/* Specify the name of the destination bucket. The destination bucket must be in the same region as the source bucket. */
const char *dest_bucket_name = "yourDestBucketName";
/* Specify the full path of the destination object. Do not include the bucket name in the full path. */
const char *dest_object_name = "yourDestObjectName";
/* Specify the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the region to cn-hangzhou. */
const char *region = "yourRegion";
void init_options(oss_request_options_t *options)
{
    options->config = oss_config_create(options->pool);
    /* Use a char* string to initialize data of the aos_string_t type. */
    aos_str_set(&options->config->endpoint, endpoint);
    /* Obtain access credentials from environment variables. Before you run the sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are configured. */
    aos_str_set(&options->config->access_key_id, getenv("OSS_ACCESS_KEY_ID"));
    aos_str_set(&options->config->access_key_secret, getenv("OSS_ACCESS_KEY_SECRET"));
    // Specify two additional parameters.
    aos_str_set(&options->config->region, region);
    options->config->signature_version = 4;
    /* Specify whether to use CNAME. The value 0 indicates that CNAME is not used. */
    options->config->is_cname = 0;
    /* Specify network parameters, such as the timeout period. */
    options->ctl = aos_http_controller_create(options->pool, 0);
}
int main(int argc, char *argv[])
{
    /* Call the aos_http_io_initialize method in main() to initialize global resources, such as network resources and memory resources. */
    if (aos_http_io_initialize(NULL, 0) != AOSE_OK) {
        exit(1);
    }
    /* Create a memory pool to manage memory. aos_pool_t is equivalent to apr_pool_t. The code used to create a memory pool is included in the APR library. */
    aos_pool_t *pool;
    /* Create a memory pool. The value of the second parameter is NULL. This value indicates that the pool does not inherit other memory pools. */
    aos_pool_create(&pool, NULL);
    /* Create and initialize options. This parameter includes global configuration information, such as endpoint, access_key_id, access_key_secret, is_cname, and curl. */
    oss_request_options_t *oss_client_options;
    /* Allocate the memory resources in the memory pool to the options. */
    oss_client_options = oss_request_options_create(pool);
    /* Initialize oss_client_options. */
    init_options(oss_client_options);
    /* Initialize the parameters. */
    aos_string_t source_bucket;
    aos_string_t source_object;
    aos_string_t dest_bucket;
    aos_string_t dest_object;
    aos_table_t *headers = NULL;
    aos_table_t *resp_headers = NULL; 
    aos_status_t *resp_status = NULL; 
    aos_str_set(&source_bucket, source_bucket_name);
    aos_str_set(&source_object, source_object_name);
    aos_str_set(&dest_bucket, dest_bucket_name);
    aos_str_set(&dest_object, dest_object_name);
    headers = aos_table_make(pool, 0);
    /* Copy the object. */
    resp_status = oss_copy_object(oss_client_options, &source_bucket, &source_object, &dest_bucket, &dest_object, headers, &resp_headers);
    if (aos_status_is_ok(resp_status)) {
        printf("copy object succeeded\n");
    } else {
        printf("copy object failed\n");
    }
    /* Release the memory pool. This operation releases the memory resources allocated for the request. */
    aos_pool_destroy(pool);
    /* Release the allocated global resources. */
    aos_http_io_deinitialize();
    return 0;
}

大きなオブジェクトをコピーする

次のコードは、UploadPartCopy操作を呼び出してマルチパートコピーを実行する方法の例を示しています。

#include "oss_api.h"
#include "aos_http_io.h"
#include <sys/stat.h>
/* Specify the endpoint of the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the endpoint to https://oss-cn-hangzhou.aliyuncs.com. */
const char *endpoint = "yourEndpoint";
/* Specify the name of the source bucket. */
const char *source_bucket_name = "yourSourceBucketName";
/* Specify the full path of the source object. Do not include the bucket name in the full path. */
const char *source_object_name = "yourSourceObjectName";
/* Specify the name of the destination bucket. The destination bucket must be in the same region as the source bucket. */
const char *dest_bucket_name = "yourDestBucketName";
/* Specify the full path of the destination object. Do not include the bucket name in the full path. */
const char *dest_object_name = "yourDestObjectName";
/* Specify the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the region to cn-hangzhou. */
const char *region = "yourRegion";
void init_options(oss_request_options_t* options)
 {
     options->config = oss_config_create(options->pool);
     /* Use a char* string to initialize data of the aos_string_t type. */
     aos_str_set(&options->config->endpoint, endpoint);
     /* Obtain access credentials from environment variables. Before you run the sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are configured. */
     aos_str_set(&options->config->access_key_id, getenv("OSS_ACCESS_KEY_ID"));
     aos_str_set(&options->config->access_key_secret, getenv("OSS_ACCESS_KEY_SECRET"));
     // Specify two additional parameters.
     aos_str_set(&options->config->region, region);
     options->config->signature_version = 4;
     /* Specify whether to use CNAME. The value 0 indicates that CNAME is not used. */
     options->config->is_cname = 0;
     /* Specify network parameters, such as the timeout period. */
     options->ctl = aos_http_controller_create(options->pool, 0);
 }
 int main(int argc, char* argv[])
 {
     /* Call the aos_http_io_initialize method in main() to initialize global resources, such as network resources and memory resources. */
     if (aos_http_io_initialize(NULL, 0) != AOSE_OK) {
         exit(1);
     }
     /* Create a memory pool to manage memory. aos_pool_t is equivalent to apr_pool_t. The code used to create a memory pool is included in the APR library. */
     aos_pool_t* pool;
     /* Create a memory pool. The value of the second parameter is NULL. This value indicates that the pool does not inherit other memory pools. */
     aos_pool_create(&pool, NULL);
     /* Create and initialize options. This parameter includes global configuration information, such as endpoint, access_key_id, access_key_secret, is_cname, and curl. */
     oss_request_options_t* oss_client_options;
     /* Allocate the memory resources in the memory pool to the options. */
     oss_client_options = oss_request_options_create(pool);
     /* Initialize oss_client_options. */
     init_options(oss_client_options);
     /* Initialize the parameters. */
     aos_string_t src_bucket;
     aos_string_t src_object;
     aos_string_t dest_bucket;
     aos_string_t dest_object;
     aos_string_t upload_id;
     aos_table_t* headers = NULL;
     aos_table_t* resp_headers = NULL;
     aos_status_t* resp_status = NULL;
     oss_list_upload_part_params_t* list_upload_part_params;
     oss_upload_part_copy_params_t* upload_part_copy_params1;
     oss_upload_part_copy_params_t* upload_part_copy_params2;
     oss_list_part_content_t* part_content;
     aos_list_t complete_part_list;
     oss_complete_part_content_t* complete_content;
     aos_table_t* list_part_resp_headers = NULL;
     aos_table_t* complete_resp_headers = NULL;
     int part1 = 1;
     int part2 = 2;
     int64_t range_start1 = 0;
     int64_t range_end1 = 6000000;//not less than 5MB
     int64_t range_start2 = 6000001;
     int64_t range_end2;
     int max_ret = 1000;
     int64_t content_length = 0;
     /* Obtain the size of the source object. */
     headers = aos_table_make(pool, 0);
     aos_str_set(&src_bucket, source_bucket_name);
     aos_str_set(&src_object, source_object_name);
     resp_status = oss_head_object(oss_client_options, &src_bucket, &src_object, headers, &resp_headers);
     if (aos_status_is_ok(resp_status)) {
         char *content_length_str = (char*)apr_table_get(resp_headers, OSS_CONTENT_LENGTH);
         if (content_length_str != NULL) {
             content_length = atoll(content_length_str);
         }
         printf("head object succeeded\n");
     }
     else {
         printf("head object failed\n");
     }
     /*  Initiate a multipart copy task. */
     headers = aos_table_make(pool, 0);
     aos_str_set(&dest_bucket, dest_bucket_name);
     aos_str_set(&dest_object, dest_object_name);
     resp_status = oss_init_multipart_upload(oss_client_options, &dest_bucket, &dest_object, &upload_id, headers, &resp_headers);
     if (aos_status_is_ok(resp_status)) {
         printf("init multipart upload succeeded, upload_id is %s\n", upload_id.data);
     }
     else {
         printf("init multipart upload failed\n");
     }
     /* Copy the first part. */
     upload_part_copy_params1 = oss_create_upload_part_copy_params(pool);
     aos_str_set(&upload_part_copy_params1->source_bucket, source_bucket_name);
     aos_str_set(&upload_part_copy_params1->source_object, source_object_name);
     aos_str_set(&upload_part_copy_params1->dest_bucket, dest_bucket_name);
     aos_str_set(&upload_part_copy_params1->dest_object, dest_object_name);
     aos_str_set(&upload_part_copy_params1->upload_id, upload_id.data);
     upload_part_copy_params1->part_num = part1;
     upload_part_copy_params1->range_start = range_start1;
     upload_part_copy_params1->range_end = range_end1;
     headers = aos_table_make(pool, 0);
     resp_status = oss_upload_part_copy(oss_client_options, upload_part_copy_params1, headers, &resp_headers);
     if (aos_status_is_ok(resp_status)) {
         printf("upload part 1 copy succeeded\n");
     }
     else {
         printf("upload part 1 copy failed\n");
     }
     /* Copy the second part. */
     range_end2 = content_length - 1;
     upload_part_copy_params2 = oss_create_upload_part_copy_params(pool);
     aos_str_set(&upload_part_copy_params2->source_bucket, source_bucket_name);
     aos_str_set(&upload_part_copy_params2->source_object, source_object_name);
     aos_str_set(&upload_part_copy_params2->dest_bucket, dest_bucket_name);
     aos_str_set(&upload_part_copy_params2->dest_object, dest_object_name);
     aos_str_set(&upload_part_copy_params2->upload_id, upload_id.data);
     upload_part_copy_params2->part_num = part2;
     upload_part_copy_params2->range_start = range_start2;
     upload_part_copy_params2->range_end = range_end2;
     headers = aos_table_make(pool, 0);
     resp_status = oss_upload_part_copy(oss_client_options, upload_part_copy_params2, headers, &resp_headers);
     if (aos_status_is_ok(resp_status)) {
         printf("upload part 2 copy succeeded\n");
     }
     else {
         printf("upload part 2 copy failed\n");
     }
     /* List the copied parts. */
     headers = aos_table_make(pool, 0);
     list_upload_part_params = oss_create_list_upload_part_params(pool);
     list_upload_part_params->max_ret = max_ret;
     aos_list_init(&complete_part_list);
     resp_status = oss_list_upload_part(oss_client_options, &dest_bucket, &dest_object, &upload_id, list_upload_part_params, &list_part_resp_headers);
     aos_list_for_each_entry(oss_list_part_content_t, part_content, &list_upload_part_params->part_list, node) {
         complete_content = oss_create_complete_part_content(pool);
         aos_str_set(&complete_content->part_number, part_content->part_number.data);
         aos_str_set(&complete_content->etag, part_content->etag.data);
         aos_list_add_tail(&complete_content->node, &complete_part_list);
     }
     /* Complete the multipart copy task. */
     resp_status = oss_complete_multipart_upload(oss_client_options, &dest_bucket, &dest_object, &upload_id, &complete_part_list, headers, &complete_resp_headers);
     if (aos_status_is_ok(resp_status)) {
         printf("complete multipart upload succeeded\n");
     }
     else {
         printf("complete multipart upload failed\n");
     }
     /* Release the memory pool. This operation releases the memory resources allocated for the request. */
     aos_pool_destroy(pool);
     /* Release the allocated global resources. */
     aos_http_io_deinitialize();
     return 0;
 }

関連ドキュメント

• 小さなオブジェクトをコピーする

  小さなオブジェクトをコピーするために呼び出すことができるAPI操作の詳細については、「CopyObject」をご参照ください。

• 大きなオブジェクトをコピーする

  ラージオブジェクトをコピーするために呼び出すことができるAPI操作の詳細については、「UploadPartCopy」をご参照ください。