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阿里云对象存储 OSS拷贝文件


本文介绍如何拷贝文件。

拷贝小文件

此操作的限制条件如下:

  • 用户有源文件的读写权限。
  • 不支持跨地域拷贝。例如,不支持将杭州存储空间里的文件拷贝到青岛。
  • 文件的大小不能超过1GB。

以下代码用于拷贝小文件:

#include "oss_api.h"
#include "aos_http_io.h"
const char *endpoint = "<yourEndpoint>";
const char *access_key_id = "<yourAccessKeyId>";
const char *access_key_secret = "<yourAccessKeySecret>";
const char *bucket_name = "<yourBucketName>";
const char *object_name = "<yourObjectName>";
const char *source_bucket_name = "<yourSourceBucketName>";
const char *source_object_name = "<yourSourceObjectName>";
const char *dest_bucket_name = "<yourDestBucketName>";
const char *dest_object_name = "<yourDestObjectName>";
void init_options(oss_request_options_t *options)
{
    options->config = oss_config_create(options->pool);
    /* 用char*类型的字符串初始化aos_string_t类型。*/
    aos_str_set(&options->config->endpoint, endpoint);
    aos_str_set(&options->config->access_key_id, access_key_id);
    aos_str_set(&options->config->access_key_secret, access_key_secret);
    /* 是否使用了CNAME。0表示不使用。*/
    options->config->is_cname = 0;
    /* 用于设置网络相关参数,比如超时时间等。*/
    options->ctl = aos_http_controller_create(options->pool, 0);
}
int main(int argc, char *argv[])
{
    /* 在程序入口调用aos_http_io_initialize方法来初始化网络、内存等全局资源。*/
    if (aos_http_io_initialize(NULL, 0) != AOSE_OK) {
        exit(1);
    }
    /* 用于内存管理的内存池(pool),等价于apr_pool_t。其实现代码在apr库中。*/
    aos_pool_t *pool;
    /* 重新创建一个内存池,第二个参数是NULL,表示没有继承其它内存池。*/
    aos_pool_create(&pool, NULL);
    /* 创建并初始化options,该参数包括endpoint、access_key_id、acces_key_secret、is_cname、curl等全局配置信息。*/
    oss_request_options_t *oss_client_options;
    /* 在内存池中分配内存给options。*/
    oss_client_options = oss_request_options_create(pool);
    /* 初始化Client的选项oss_client_options。*/
    init_options(oss_client_options);
    /* 初始化参数。*/
    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);
    /* 拷贝文件。*/
    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");
    }
    /* 释放内存池,相当于释放了请求过程中各资源分配的内存。*/
    aos_pool_destroy(pool);
    /* 释放之前分配的全局资源。*/
    aos_http_io_deinitialize();
    return 0;
}

拷贝大文件

对于大于1GB的文件,建议通过oss_upload_part_copy接口来进行分片拷贝(UploadPartCopy)。 以下代码用于分片拷贝文件:

#include "oss_api.h"
#include "aos_http_io.h"
#include <sys/stat.h>
const char *endpoint = "<yourEndpoint>";
const char *access_key_id = "<yourAccessKeyId>";
const char *access_key_secret = "<yourAccessKeySecret>";
const char *source_bucket_name = "<yourSourceBucketName>";
const char *source_object_name = "<yourSourceObjectName>";
const char *dest_bucket_name = "<yourDestBucketName>";
const char *dest_object_name = "<yourDestObjectName>";
const char *local_filename = "<yourLocalFilename>";
void init_options(oss_request_options_t *options)
{
    options->config = oss_config_create(options->pool);
    /* 用char*类型的字符串初始化aos_string_t类型。*/
    aos_str_set(&options->config->endpoint, endpoint);
    aos_str_set(&options->config->access_key_id, access_key_id);
    aos_str_set(&options->config->access_key_secret, access_key_secret);
    /* 是否使用了CNAME。0表示不使用。*/
    options->config->is_cname = 0;
    /* 用于设置网络相关参数,比如超时时间等。*/
    options->ctl = aos_http_controller_create(options->pool, 0);
}
int64_t get_file_size(const char *file_path)
{
    int64_t filesize = -1;
    struct stat statbuff;
    if(stat(file_path, &statbuff) < 0){
        return filesize;
    } else {
        filesize = statbuff.st_size;
    }
    return filesize;
}
int main(int argc, char *argv[])
{
    /* 在程序入口调用aos_http_io_initialize方法来初始化网络、内存等全局资源。*/
    if (aos_http_io_initialize(NULL, 0) != AOSE_OK) {
        exit(1);
    }
    /* 用于内存管理的内存池(pool),等价于apr_pool_t。其实现代码在apr库中。*/
    aos_pool_t *pool;
    /* 重新创建一个内存池,第二个参数是NULL,表示没有继承其它内存池。*/
    aos_pool_create(&pool, NULL);
    /* 创建并初始化options,该参数包括endpoint、access_key_id、acces_key_secret、is_cname、curl等全局配置信息。*/
    oss_request_options_t *oss_client_options;
    /* 在内存池中分配内存给options。*/
    oss_client_options = oss_request_options_create(pool);
    /* 初始化Client的选项oss_client_options。*/
    init_options(oss_client_options);
    /* 初始化参数。*/
    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;
    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");
    }
    /* 拷贝第一个分片数据。*/
    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");
    }
    /* 拷贝第二个分片数据。*/
    range_end2 = get_file_size(local_filename) - 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");
    }
    /* 列出分片。*/
    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);
    }
    /* 完成分片拷贝。*/
    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");
    }
    /* 释放内存池,相当于释放了请求过程中各资源分配的内存。*/
    aos_pool_destroy(pool);
    /* 释放之前分配的全局资源。*/
    aos_http_io_deinitialize();
    return 0;
}

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