/
write.go
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/
write.go
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// Author: yann
// Date: 2022/5/22
// Desc: hdfsrest
package hdfs
import (
"bytes"
"fmt"
"net/http"
"os"
"strconv"
)
const (
DefaultCreateFileFormat = "%s/webhdfs/v1%s?op=CREATE&overwrite=false&permission=644&buffersize=4096&replication=%d&user.name=%s"
CreateFileFormat = "%s/webhdfs/v1%s?op=CREATE&overwrite=%v&blocksize=%d&permission=%s&buffersize=%d&replication=%d&user.name=%s"
AppendFileFormat = "%s/webhdfs/v1%s?op=APPEND&buffersize=%d&user.name=%s"
DefaultBufferSize = 4096
DefaultFilePerm = 0644
ContentTypeKey = "Content-Type"
ContentTypeValue = "application/octet-stream"
)
// Create 使用默认配置创建文件
func (c *Client) Create(path string, data []byte) error {
req, err := http.NewRequest(http.MethodPut, fmt.Sprintf(DefaultCreateFileFormat, c.addr, path, c.replication, c.user), bytes.NewReader(data))
if err != nil {
return err
}
req.Header.Set(ContentTypeKey, ContentTypeValue)
resp, err := c.Do(req)
if err != nil {
return err
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK && resp.StatusCode != http.StatusCreated {
return GetErrFromBody(resp)
}
return nil
}
// CreateFile 自定义配置创建文件
func (c *Client) CreateFile(path string, overwrite bool, blockSize uint64, perm os.FileMode, bufferSize uint, replication uint16, data []byte) error {
if blockSize == 0 {
blockSize = c.blockSize
}
if bufferSize == 0 {
bufferSize = DefaultBufferSize
}
if replication == 0 {
replication = DefaultReplication
}
if perm == 0 {
perm = DefaultFilePerm
}
req, err := http.NewRequest(http.MethodPut, fmt.Sprintf(CreateFileFormat, c.addr, path, overwrite, blockSize, strconv.FormatInt(int64(perm), 8), bufferSize, replication, c.user), bytes.NewReader(data))
if err != nil {
return err
}
req.Header.Set(ContentTypeKey, ContentTypeValue)
resp, err := c.Do(req)
if err != nil {
return err
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK && resp.StatusCode != http.StatusCreated {
return GetErrFromBody(resp)
}
return nil
}
// CreateFileWithGoodBlock 使用合适的块大小存放数据
func (c *Client) CreateFileWithGoodBlock(path string, data []byte) error {
req, err := http.NewRequest(http.MethodPut, fmt.Sprintf(CreateFileFormat, c.addr, path, true, getBlockSize(len(data), c.blockSize), strconv.FormatInt(int64(DefaultFilePerm), 8), DefaultBufferSize, c.replication, c.user), bytes.NewReader(data))
if err != nil {
return err
}
req.Header.Set(ContentTypeKey, ContentTypeValue)
resp, err := c.Do(req)
if err != nil {
return err
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK && resp.StatusCode != http.StatusCreated {
return GetErrFromBody(resp)
}
return nil
}
func (c *Client) Append(path string, bufferSize uint, data []byte) error {
if bufferSize == 0 {
bufferSize = DefaultBufferSize
}
req, err := http.NewRequest(http.MethodPost, fmt.Sprintf(AppendFileFormat, c.addr, path, bufferSize, c.user), bytes.NewReader(data))
if err != nil {
return err
}
req.Header.Set(ContentTypeKey, ContentTypeValue)
resp, err := c.Do(req)
if err != nil {
return err
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK && resp.StatusCode != http.StatusCreated {
return GetErrFromBody(resp)
}
return nil
}
const MB = 1024 * 1024
func getBlockSize(size int, minBlockSize uint64) uint64 {
dataLength := uint64(size)
switch {
case dataLength < minBlockSize:
return minBlockSize
case dataLength >= 512*MB:
dataLength = 512 * MB
case dataLength >= 256*MB:
dataLength = 256 * MB
case dataLength >= 128*MB:
dataLength = 128 * MB
case dataLength >= 64*MB:
dataLength = 64 * MB
case dataLength >= 32*MB:
dataLength = 32 * MB
case dataLength >= 16*MB:
dataLength = 16 * MB
case dataLength >= 8*MB:
dataLength = 8 * MB
case dataLength >= 4*MB:
dataLength = 4 * MB
case dataLength >= 2*MB:
dataLength = 2 * MB
default:
dataLength = 1 * MB
}
if dataLength < minBlockSize {
dataLength = minBlockSize
}
return dataLength
}