This topic describes how to copy a file (object) from a source bucket to the same bucket or to a different bucket in the same region.
Usage notes
In this topic, the public endpoint of the China (Hangzhou) region is used. If you want to access OSS from other Alibaba Cloud services in the same region as OSS, use an internal endpoint. For more information about OSS regions and endpoints, see Regions and endpoints.
In this topic, an OSSClient instance is created by using an OSS endpoint. If you want to create an OSSClient instance by using custom domain names or Security Token Service (STS), see Initialization.
Use CopyObject or UploadPartCopy to copy a file. The operation to use depends on the file size. For more information about file size limits for copying, see CopyObject.
Copy a file using CopyObject
Note
You must have read permission for the source file and read/write permissions for the destination bucket.
Cross-region copy is not supported. For example, you cannot copy a file from a bucket in the China (Hangzhou) region to a bucket in the China (Qingdao) region.
The following code shows how to copy a file using CopyObject:
#include "oss_api.h"
#include "aos_http_io.h"
/* Set yourEndpoint to the Endpoint of the region where the bucket is located. For example, if the bucket is 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. The full path cannot contain the bucket name. */
const char *source_object_name = "yourSourceObjectName";
/* Specify the name of the destination bucket, which must be in the same region as the source bucket. */
const char *dest_bucket_name = "yourDestBucketName";
/* Specify the full path of the destination object. The full path cannot contain the bucket name. */
const char *dest_object_name = "yourDestObjectName";
/* Set yourRegion to the Region ID of the region where the bucket is located. For example, if the bucket is in the China (Hangzhou) region, set the Region ID to cn-hangzhou. */
const char *region = "yourRegion";
void init_options(oss_request_options_t *options)
{
options->config = oss_config_create(options->pool);
/* Initialize the aos_string_t type with a char* string. */
aos_str_set(&options->config->endpoint, endpoint);
/* Obtain access credentials from environment variables. Before you run this sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are set. */
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"));
// Configure the following two additional parameters.
aos_str_set(&options->config->region, region);
options->config->signature_version = 4;
/* Specifies whether a CNAME is used. 0 indicates that no CNAME is used. */
options->config->is_cname = 0;
/* Set 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 at the program entry to initialize global resources such as the network and memory. */
if (aos_http_io_initialize(NULL, 0) != AOSE_OK) {
exit(1);
}
/* The memory pool (pool) for memory management is equivalent to apr_pool_t. The implementation code is in the APR library. */
aos_pool_t *pool;
/* Create a memory pool. The second parameter is NULL, which indicates that the new memory pool does not inherit from another memory pool. */
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 memory to options in the memory pool. */
oss_client_options = oss_request_options_create(pool);
/* Initialize the client options oss_client_options. */
init_options(oss_client_options);
/* Initialize 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 file. */
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 releases the memory allocated to resources during the request. */
aos_pool_destroy(pool);
/* Release the previously allocated global resources. */
aos_http_io_deinitialize();
return 0;
}Copy a file using UploadPartCopy
The following code shows how to copy a file in parts using UploadPartCopy:
#include "oss_api.h"
#include "aos_http_io.h"
#include <sys/stat.h>
/* Set yourEndpoint to the Endpoint of the region where the bucket is located. For example, if the bucket is 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. The full path cannot contain the bucket name. */
const char *source_object_name = "yourSourceObjectName";
/* Specify the name of the destination bucket, which must be in the same region as the source bucket. */
const char *dest_bucket_name = "yourDestBucketName";
/* Specify the full path of the destination object. The full path cannot contain the bucket name. */
const char *dest_object_name = "yourDestObjectName";
/* Set yourRegion to the Region ID of the region where the bucket is located. For example, if the bucket is in the China (Hangzhou) region, set the Region ID to cn-hangzhou. */
const char *region = "yourRegion";
void init_options(oss_request_options_t* options)
{
options->config = oss_config_create(options->pool);
/* Initialize the aos_string_t type with a char* string. */
aos_str_set(&options->config->endpoint, endpoint);
/* Obtain access credentials from environment variables. Before you run this sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are set. */
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"));
// Configure the following two additional parameters.
aos_str_set(&options->config->region, region);
options->config->signature_version = 4;
/* Specifies whether a CNAME is used. 0 indicates that no CNAME is used. */
options->config->is_cname = 0;
/* Set 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 at the program entry to initialize global resources such as the network and memory. */
if (aos_http_io_initialize(NULL, 0) != AOSE_OK) {
exit(1);
}
/* The memory pool (pool) for memory management is equivalent to apr_pool_t. The implementation code is in the APR library. */
aos_pool_t* pool;
/* Create a memory pool. The second parameter is NULL, which indicates that the new memory pool does not inherit from another memory pool. */
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 memory to options in the memory pool. */
oss_client_options = oss_request_options_create(pool);
/* Initialize the client options oss_client_options. */
init_options(oss_client_options);
/* Initialize 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");
}
/* Initialize the multipart upload. */
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 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. */
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 releases the memory allocated to resources during the request. */
aos_pool_destroy(pool);
/* Release the previously allocated global resources. */
aos_http_io_deinitialize();
return 0;
}References
Copy small files
For more information about the API operation to copy small files, see CopyObject.
Copy large files
For more information about the API operation to copy large files, see UploadPartCopy.