You must initialize request options (oss_request_options_t) and specify an endpoint when you use Object Storage Service (OSS) SDK for C.
Initialize request options
Use an OSS endpoint to initialize request options
The following sample code provides an example on how to use an OSS endpoint to initialize request options:
#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";
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 whether to use CNAME. A value of 0 indicates that CNAME is not used. */
options->config->is_cname = 0;
/* Specify network parameters. The second parameter in this function specifies the ownership of ctl. By default, the value of the second parameter is 0. */
options->ctl = aos_http_controller_create(options->pool, 0);
}
int main() {
aos_pool_t *p;
oss_request_options_t *options;
/* Initialize global variables. You need to initialize global variables only once in the program lifecycle. */
if (aos_http_io_initialize(NULL, 0) != AOSE_OK) {
return -1;
}
/* Initialize the memory pool and options. */
aos_pool_create(&p, NULL);
options = oss_request_options_create(p);
init_options(options);
/* The logic code. In this example, the logic code is omitted. */
/* Release the memory pool. This operation releases the memory resources allocated for the request. */
aos_pool_destroy(p);
/* Release global resources that are allocated. You need to release global resources only once in the program lifecycle. */
aos_http_io_deinitialize();
return 0;
}Use a custom domain name to initialize request options
The following sample code provides an example on how to use a custom domain name to initialize request options:
#include "oss_api.h"
#include "aos_http_io.h"
# Specify the custom domain name. */
const char *endpoint = "yourCustomEndpoint";
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"));
/* Enable CNAME and map the custom domain name to your bucket. */
options->config->is_cname = 1;
options->ctl = aos_http_controller_create(options->pool, 0);
}
int main() {
aos_pool_t *p;
oss_request_options_t *options;
/* Initialize global variables. You need to initialize global variables only once in the program lifecycle. */
if (aos_http_io_initialize(NULL, 0) != AOSE_OK) {
return -1;
}
/* Initialize the memory pool and options. */
aos_pool_create(&p, NULL);
options = oss_request_options_create(p);
init_options(options);
/* The logic code. In this example, the logic code is omitted. */
/* Release the memory pool. This operation releases the memory resources allocated for the request. */
aos_pool_destroy(p);
/* Release global resources that are allocated. You need to release global resources only once in the program lifecycle. */
aos_http_io_deinitialize();
return 0;
}Use temporary access credentials that you obtained from STS to initialize request options
The following sample code provides an example on how to use temporary access credentials that are obtained from Security Token Service (STS) to initialize request options:
#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";
/* Before you run the sample code, make sure that the YOUR_ACCESS_KEY_ID and YOUR_ACCESS_KEY_SECRET environment variables are configured by using temporary access credentials obtained from STS. */
const char *access_key_id = getenv("YOUR_ACCESS_KEY_ID");
const char *access_key_secret = getenv("YOUR_ACCESS_KEY_SECRET");
/* Specify the security token that is obtained from STS. */
const char *sts_token = "<yourSecurityToken>";
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);
aos_str_set(&options->config->access_key_id, access_key_id);
aos_str_set(&options->config->access_key_secret, access_key_secret);
/* Configure STS. */
aos_str_set(&options->config->sts_token, sts_token);
/* Specify whether to use CNAME. A value of 0 indicates that CNAME is not used. */
options->config->is_cname = 0;
options->ctl = aos_http_controller_create(options->pool, 0);
}
int main() {
aos_pool_t *p;
oss_request_options_t *options;
/* Initialize global variables. You need to initialize global variables only once in the program lifecycle. */
if (aos_http_io_initialize(NULL, 0) != AOSE_OK) {
return -1;
}
/* Initialize the memory pool and options. */
aos_pool_create(&p, NULL);
options = oss_request_options_create(p);
init_options(options);
/* The logic code. In this example, the logic code is omitted. */
/* Release the memory pool. This operation releases the memory resources allocated for the request. */
aos_pool_destroy(p);
/* Release global resources that are allocated. You need to release global resources only once in the program lifecycle. */
aos_http_io_deinitialize();
return 0;
}Configure parameters
The following table describes the common parameters.
Parameter | Description |
speed_limit | The lower limit for the average speed. Unit: bytes/second. Default value: 1024. |
speed_time | The maximum time period allowed if the speed is less than the lower limit for the average speed. Unit: seconds. Default value: 15. Important You must configure both the speed_limit and speed_time parameters to specify the timeout period for requests. If the average speed is less than the lower limit that is specified by the speed_limit parameter for a period of time that is specified by the speed_time parameter, the request is interrupted. |
connect_timeout | The timeout period for establishing a connection. Unit: seconds. Default value: 10. |
dns_cache_timeout | The timeout period of the DNS cache. Unit: seconds. Default value: 60. |
max_memory_size | The maximum size of data that can be written to the memory when data is downloaded. Unit: bytes. By default, the maximum size of data that can be written to the memory when data is downloaded is 1 GB. |
enable_crc | Specifies whether to enable CRC-64. Valid values:
|
verify_ssl | Specifies whether to enable SSL-based authentication. Valid values:
|
ca_path | The root path of the CA certificate. This parameter is valid when verify_ssl is set to 1. By default, this parameter is left empty. |
ca_file | The path of the CA certificate. This parameter is valid when verify_ssl is set to 1. By default, this parameter is left empty. |
proxy_host | The address of the proxy server in the |
proxy_auth | The password of the proxy server in the |
Configuration examples
Specify a timeout period
The following sample code provides an example on how to specify a timeout period:
#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";
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 whether to use CNAME. A value of 0 indicates that CNAME is not used. */
options->config->is_cname = 0;
/* Specify network parameters. The second parameter in this function specifies the ownership of ctl. By default, the value of the second parameter is 0. */
options->ctl = aos_http_controller_create(options->pool, 0);
/* Specify the timeout period for establishing a connection. Default value: 10. Unit: seconds. */
options->ctl->options->connect_timeout = 10;
/* Specify the timeout period of the DNS cache. Default value: 60. Unit: seconds. */
options->ctl->options->dns_cache_timeout = 60;
/*
Specify the timeout period for requests.
Configure the speed_limit parameter to specify the lower limit for the average speed. Default value: 1024 (1 KB/s).
Configure the speed_time parameter to specify the allowed maximum time period for an average speed that is less than the lower speed limit. Default value: 15. Unit: seconds.
The following sample code provides an example of a request timeout that occurs when the transmission speed is less than 1 KB/s for 15 consecutive seconds:
*/
options->ctl->options->speed_limit = 1024;
options->ctl->options->speed_time = 15;
}
int main() {
aos_pool_t *p;
oss_request_options_t *options;
/* Initialize global variables. You need to initialize global variables only once in the program lifecycle. */
if (aos_http_io_initialize(NULL, 0) != AOSE_OK) {
return -1;
}
/* Initialize the memory pool and options. */
aos_pool_create(&p, NULL);
options = oss_request_options_create(p);
init_options(options);
/* The logic code. In this example, the logic code is omitted. */
/* Release the memory pool. This operation releases the memory resources allocated for the request. */
aos_pool_destroy(p);
/* Release global resources that are allocated. You need to release global resources only once in the program lifecycle. */
aos_http_io_deinitialize();
return 0;
}Configure SSL-based authentication
By default, SSL-based authentication is enabled for OSS SDK for C 3.9.2 or later. If SSL-based authentication fails, you need to specify the correct path of the SSL certificate, or disable SSL-based authentication.
The following sample code provides an example on how to configure SSL-based authentication:
#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";
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 whether to use CNAME. A value of 0 indicates that CNAME is not used. */
options->config->is_cname = 0;
/* Specify network parameters. The second parameter in this function specifies the ownership of ctl. By default, the value of the second parameter is 0. */
options->ctl = aos_http_controller_create(options->pool, 0);
/* Configure SSL-based authentication. */
Configure the verify_ssl parameter to specify whether to enable SSL-based authentication. Valid values: 0 and 1. Default value: 1. The value 1 indicates that SSL-based authentication is enabled.
Configure the ca_path parameter to specify the root path of the CA certificate. This parameter is valid when verify_ssl is set to 1. By default, this parameter is left empty.
Configure the ca_file parameter to specify the path of the CA certificate. This parameter is valid when verify_ssl is set to 1. By default, this parameter is left empty. */
/* Enable SSL-based authentication and specify the path of the CA certificate. */
//options->ctl->options->verify_ssl = 1;
//options->ctl->options->ca_path = "/etc/ssl/certs/";
//options->ctl->options->ca_file = "/etc/ssl/certs/ca-certificates.crt";
/* Disable SSL-based authentication. */
//options->ctl->options->verify_ssl = 0;
}
int main() {
aos_pool_t *p;
oss_request_options_t *options;
/* Initialize global variables. You need to initialize global variables only once in the program lifecycle. */
if (aos_http_io_initialize(NULL, 0) != AOSE_OK) {
return -1;
}
/* Initialize the memory pool and options. */
aos_pool_create(&p, NULL);
options = oss_request_options_create(p);
init_options(options);
/* The logic code. In this example, the logic code is omitted. */
/* Release the memory pool. This operation releases the memory resources allocated for the request. */
aos_pool_destroy(p);
/* Release global resources that are allocated. You need to release global resources only once in the program lifecycle. */
aos_http_io_deinitialize();
return 0;
}