Torch Object Storage
Torch Object Storage
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- Documentation
Torch Object StorageSDK ReferenceGoObject InterfaceDownload ObjectRange Download (Go SDK)
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Range Download (Go SDK)
Copy pageDownload PDFRange Download (Go SDK)
If you only need to retrieve a portion of the data from an object, you can use range downloading to obtain data within a specified range. This article introduces the range downloading feature.
Precautions
- Before downloading an object, you must have the tos:GetObject permission. For detailed instructions, please refer to the Permission Configuration Guide.
- For buckets with versioning enabled, you must have the tos:GetObjectVersion permission to download a specified version of an object. For detailed instructions, please refer to the Permission Configuration Guide.
- If an application downloads the same object in large quantities at the same time, your access speed will be limited by TOS bandwidth and geographic restrictions. It is recommended that you utilize CDN products to enhance performance while simultaneously reducing your costs. For detailed information on accessing TOS via CDN, please refer to Using CDN to Accelerate Access to TOS Resources.
Description of Download Scope
When specifying the range of an object, the minimum starting value is 0, and the maximum is the object length minus one. For example, for an object with a size of 100 bytes, the valid download range is 0 to 99.
Sample Code
Specify Start/End Download Objects
The following code is used to specify the start and end positions for downloading a portion of an object's data from a bucket.
package main
import (
"context"
"fmt"
"io/ioutil"
"github.com/volcengine/ve-tos-golang-sdk/v2/tos"
)
func checkErr(err error) {
if err != nil {
if serverErr, ok := err.(*tos.TosServerError); ok {
fmt.Println("Error:", serverErr.Error())
fmt.Println("Request ID:", serverErr.RequestID)
fmt.Println("Response Status Code:", serverErr.StatusCode)
fmt.Println("Response Header:", serverErr.Header)
fmt.Println("Response Err Code:", serverErr.Code)
fmt.Println("Response Err Msg:", serverErr.Message)
} else if clientErr, ok := err.(*tos.TosClientError); ok {
fmt.Println("Error:", clientErr.Error())
fmt.Println("Client Cause Err:", clientErr.Cause.Error())
} else {
fmt.Println("Error:", err)
}
panic(err)
}
}
func main() {
var (
accessKey = os.Getenv("TOS_ACCESS_KEY")
secretKey = os.Getenv("TOS_SECRET_KEY")
endpoint = "https://tos-cn-beijing.volces.com"
region = "cn-beijing"
bucketName = "*** Provide your bucket name ***"
objectKey = "example_dir/example.txt"
ctx = context.Background()
)
client, err := tos.NewClientV2(endpoint, tos.WithRegion(region), tos.WithCredentials(tos.NewStaticCredentials(accessKey, secretKey)))
checkErr(err)
getOutput, err := client.GetObjectV2(ctx, &tos.GetObjectV2Input{
Bucket: bucketName,
Key: objectKey,
RangeStart: 32,
RangeEnd: 64,
})
checkErr(err)
fmt.Println("GetObjectV2 Request ID:", getOutput.RequestID)
fmt.Println("GetObjectV2 Response ContentType:", getOutput.ContentType)
fmt.Println("GetObjectV2 Response ContentEncoding:", getOutput.ContentEncoding)
fmt.Println("GetObjectV2 Response ContentLength", getOutput.ContentLength)
defer getOutput.Content.Close()
body, err := ioutil.ReadAll(getOutput.Content)
checkErr(err)
fmt.Println("Get Object Content:", body)
}
Configure Progress Bar
During downloading, progress can be received by implementing the tos.DataTransferStatusChange interface. A code example is provided below.
package main
import (
"context"
"fmt"
"io/ioutil"
"github.com/volcengine/ve-tos-golang-sdk/v2/tos"
"github.com/volcengine/ve-tos-golang-sdk/v2/tos/enum"
)
type listener struct {
}
func (l *listener) DataTransferStatusChange(event *tos.DataTransferStatus) {
switch event.Type {
case enum.DataTransferStarted:
fmt.Println("Data transfer started")
case enum.DataTransferRW:
if event.TotalBytes != -1 {
fmt.Printf("Once Read:%d,ConsumerBytes/TotalBytes: %d/%d,%d%%\n", event.RWOnceBytes, event.ConsumedBytes, event.TotalBytes, event.ConsumedBytes*100/event.TotalBytes)
} else {
fmt.Printf("Once Read:%d,ConsumerBytes:%d\n", event.RWOnceBytes, event.ConsumedBytes)
}
case enum.DataTransferSucceed:
fmt.Printf("Data Transfer Succeed, ConsumerBytes/TotalBytes: %d/%d,%d%%\n", event.ConsumedBytes, event.TotalBytes, event.ConsumedBytes*100/event.TotalBytes)
case enum.DataTransferFailed:
fmt.Printf("Data Transfer Failed\n")
}
}
func checkErr(err error) {
if err != nil {
if serverErr, ok := err.(*tos.TosServerError); ok {
fmt.Println("Error:", serverErr.Error())
fmt.Println("Request ID:", serverErr.RequestID)
fmt.Println("Response Status Code:", serverErr.StatusCode)
fmt.Println("Response Header:", serverErr.Header)
fmt.Println("Response Err Code:", serverErr.Code)
fmt.Println("Response Err Msg:", serverErr.Message)
} else if clientErr, ok := err.(*tos.TosClientError); ok {
fmt.Println("Error:", clientErr.Error())
fmt.Println("Client Cause Err:", clientErr.Cause.Error())
} else {
fmt.Println("Error:", err)
}
panic(err)
}
}
func main() {
var (
accessKey = os.Getenv("TOS_ACCESS_KEY")
secretKey = os.Getenv("TOS_SECRET_KEY")
endpoint = "https://tos-cn-beijing.volces.com"
region = "cn-beijing"
bucketName = "*** Provide your bucket name ***"
objectKey = "example_dir/example.txt"
ctx = context.Background()
)
client, err := tos.NewClientV2(endpoint, tos.WithRegion(region), tos.WithCredentials(tos.NewStaticCredentials(accessKey, secretKey)))
checkErr(err)
getOutput, err := client.GetObjectV2(ctx, &tos.GetObjectV2Input{
Bucket: bucketName,
Key: objectKey,
RangeStart: 32,
RangeEnd: 64,
DataTransferListener: &listener{},
})
checkErr(err)
fmt.Println("GetObjectV2 Request ID:", getOutput.RequestID)
fmt.Println("GetObjectV2 Response ContentType:", getOutput.ContentType)
fmt.Println("GetObjectV2 Response ContentEncoding:", getOutput.ContentEncoding)
fmt.Println("GetObjectV2 Response ContentLength", getOutput.ContentLength)
defer getOutput.Content.Close()
body, err := ioutil.ReadAll(getOutput.Content)
checkErr(err)
fmt.Println("Get Object Content:", body)
}
Configuring Client Bandwidth Throttling
When downloading objects, you can use the tos.RateLimiter interface in the client to restrict the bandwidth consumed by the downloaded data. The following code demonstrates this.
package main
import (
"context"
"fmt"
"io/ioutil"
"sync"
"time"
"github.com/volcengine/ve-tos-golang-sdk/v2/tos"
)
type rateLimit struct {
rate int64
capacity int64
currentAmount int64
sync.Mutex
lastConsumeTime time.Time
}
func NewDefaultRateLimit(rate int64, capacity int64) tos.RateLimiter {
return &rateLimit{
rate: rate,
capacity: capacity,
lastConsumeTime: time.Now(),
currentAmount: capacity,
Mutex: sync.Mutex{},
}
}
func (d *rateLimit) Acquire(want int64) (ok bool, timeToWait time.Duration) {
d.Lock()
defer d.Unlock()
if want > d.capacity {
want = d.capacity
}
increment := int64(time.Now().Sub(d.lastConsumeTime).Seconds() * float64(d.rate))
if increment+d.currentAmount > d.capacity {
d.currentAmount = d.capacity
} else {
d.currentAmount += increment
}
if want > d.currentAmount {
timeToWaitSec := float64(want-d.currentAmount) / float64(d.rate)
return false, time.Duration(timeToWaitSec * float64(time.Second))
}
d.lastConsumeTime = time.Now()
d.currentAmount -= want
return true, 0
}
func checkErr(err error) {
if err != nil {
if serverErr, ok := err.(*tos.TosServerError); ok {
fmt.Println("Error:", serverErr.Error())
fmt.Println("Request ID:", serverErr.RequestID)
fmt.Println("Response Status Code:", serverErr.StatusCode)
fmt.Println("Response Header:", serverErr.Header)
fmt.Println("Response Err Code:", serverErr.Code)
fmt.Println("Response Err Msg:", serverErr.Message)
} else if clientErr, ok := err.(*tos.TosClientError); ok {
fmt.Println("Error:", clientErr.Error())
fmt.Println("Client Cause Err:", clientErr.Cause.Error())
} else {
fmt.Println("Error:", err)
}
panic(err)
}
}
func main() {
var (
accessKey = os.Getenv("TOS_ACCESS_KEY")
secretKey = os.Getenv("TOS_SECRET_KEY")
endpoint = "https://tos-cn-beijing.volces.com"
region = "cn-beijing"
bucketName = "*** Provide your bucket name ***"
objectKey = "example_dir/example.txt"
ctx = context.Background()
)
client, err := tos.NewClientV2(endpoint, tos.WithRegion(region), tos.WithCredentials(tos.NewStaticCredentials(accessKey, secretKey)))
checkErr(err)
rateLimit1m := int64(1024 * 1024)
getOutput, err := client.GetObjectV2(ctx, &tos.GetObjectV2Input{
Bucket: bucketName,
Key: objectKey,
RangeStart: 32,
RangeEnd: 64,
RateLimiter: NewDefaultRateLimit(rateLimit1m, rateLimit1m),
})
checkErr(err)
fmt.Println("GetObjectV2 Request ID:", getOutput.RequestID)
fmt.Println("GetObjectV2 Response ContentType:", getOutput.ContentType)
fmt.Println("GetObjectV2 Response ContentEncoding:", getOutput.ContentEncoding)
fmt.Println("GetObjectV2 Response ContentLength", getOutput.ContentLength)
defer getOutput.Content.Close()
body, err := ioutil.ReadAll(getOutput.Content)
checkErr(err)
fmt.Println("Get Object Content:", body)
}
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Last updated: 2025.09.19 17:30:22
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