Debe restaurar los objetos archivados antes de leerlos. En este tema se describe cómo llevar a cabo esta operación.
Notas
El método RestoreObject solo se aplica a los objetos archivados.
En este tema se utiliza el endpoint público de la región China (Hangzhou). Si necesita acceder a OSS desde otros servicios de Alibaba Cloud en la misma región que OSS, utilice un endpoint interno. Para obtener más información sobre las regiones y los endpoints de OSS, consulte Regions and endpoints.
En este tema se muestra cómo crear una instancia de OSSClient con un endpoint de OSS. Para conocer configuraciones alternativas, como usar un dominio personalizado o autenticarse con credenciales de Security Token Service (STS), consulte Initialization (C SDK).
Para restaurar un objeto, debe contar con el permiso
oss:RestoreObject. Para obtener más información, consulte Grant a custom policy.
Código de ejemplo
A continuación se muestra un ejemplo de código para restaurar un objeto archivado.
#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 bucket name. Example: examplebucket. */
const char *bucket_name = "examplebucket";
/* Specify the full path of the object. The full path cannot contain the bucket name. Example: exampledir/exampleobject.txt. */
const char *object_name = "exampledir/exampleobject.txt";
/* Set yourRegion to the region where the bucket is located. For example, if the bucket is 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);
/* 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 parameters.
aos_str_set(&options->config->region, region);
options->config->signature_version = 4;
/* Specify 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);
}
/* A memory pool for memory management. This 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 contains 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 bucket;
aos_string_t object;
aos_table_t *headers = NULL;
aos_table_t *resp_headers = NULL;
aos_status_t *resp_status = NULL;
aos_str_set(&bucket, bucket_name);
aos_str_set(&object, object_name);
headers = aos_table_make(pool, 0);
/* Restore the object. */
do {
headers = aos_table_make(pool, 0);
resp_status = oss_restore_object(oss_client_options, &bucket, &object, headers, &resp_headers);
printf("restore object resp_status->code: %d \n", resp_status->code);
if (resp_status->code != 409) {
break;
} else {
printf("restore object is already in progress, resp_status->code: %d \n", resp_status->code);
apr_sleep(5000);
}
} while (1);
/* 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;
}
Referencias
Para obtener más información sobre la operación de API RestoreObject, consulte RestoreObject.