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ossselect.go
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ossselect.go
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package goossselect
import (
"encoding/xml"
"errors"
"fmt"
"net/http"
"crypto/tls"
"net"
"time"
"strconv"
"bytes"
"io/ioutil"
"os"
"io"
)
var InvalidValueErr = errors.New("invalid values for selector")
type Selector struct {
XMLName xml.Name `xml:"SelectRequest"`
Expression string `xml:"Expression"`
CompressionType string `xml:"InputSerialization>CompressionType"`
FileHeaderInfo string `xml:"InputSerialization>CSV>FileHeaderInfo"`
InRecordDelimiter string `xml:"InputSerialization>CSV>RecordDelimiter,omitempty"`
InFieldDelimiter string `xml:"InputSerialization>CSV>FieldDelimiter,omitempty"`
QuoteCharacter string `xml:"InputSerialization>CSV>QuoteCharacter,omitempty"`
CommentCharacter string `xml:"InputSerialization>CSV>CommentCharacter,omitempty"`
Range string `xml:"InputSerialization>CSV>Range,omitempty"`
OutputRawData bool `xml:"OutputSerialization>OutputRawData,omitempty"`
OutRecordDelimiter string `xml:"OutputSerialization>CSV>RecordDelimiter,omitempty"`
OutFieldDelimiter string `xml:"OutputSerialization>CSV>FieldDelimiter,omitempty"`
KeepAllColumns bool `xml:"OutputSerialization>CSV>KeepAllColumns,omitempty"`
}
type Meta struct {
XMLName xml.Name `xml:"CsvMetaRequest"`
OverwriteIfExisting bool `xml:"Expression,omitempty"`
RecordDelimiter string `xml:"InputSerialization>CSV>RecordDelimiter,omitempty"`
FieldDelimiter string `xml:"InputSerialization>CSV>FieldDelimiter,omitempty"`
QuoteCharacter string `xml:"InputSerialization>CSV>QuoteCharacter,omitempty"`
CompressionType string `xml:"InputSerialization>CompressionType"`
}
type MetaResponse struct {
Lines int64
Columns int64
Splits int64
ContentLength int64
}
// Conn oss conn
type Conn struct {
Config *Config
Client *http.Client
}
// Config oss configure
type Config struct {
AccessKeyID string // accessId
AccessKeySecret string // accessKey
Timeout time.Duration
KeepAlive time.Duration
TLSHandshakeTimeout time.Duration
ResponseHeaderTimeout time.Duration
ExpectContinueTimeout time.Duration
}
func NewMeta(options ...func(*Meta) error) (*Meta, error) {
m := &Meta{
CompressionType: "None",
}
for _, f := range options {
if err := f(m); err != nil {
return nil, err
}
}
return m, nil
}
func NewSelector(query string, options ...func(*Selector) error) (*Selector, error) {
exp := toBase64(query)
s := &Selector{
CompressionType: "None",
OutputRawData: true,
FileHeaderInfo: "None",
Expression: exp,
}
for _, f := range options {
if err := f(s); err != nil {
return nil, err
}
}
return s, nil
}
func NewConfig(options ...func(*Config)) *Config {
c := &Config{
Timeout: 10 * time.Second,
KeepAlive: 10 * time.Second,
TLSHandshakeTimeout: 5 * time.Second,
ResponseHeaderTimeout: 5 * time.Second,
ExpectContinueTimeout: 5 * time.Second,
}
for _, f := range options {
f(c)
}
return c
}
func toXML(s interface{}) ([]byte, error) {
ss, err := xml.Marshal(s)
if err != nil {
return nil, err
}
return ss, nil
}
func getResponse(bucket, objectKey, action string, content []byte, config *Config) (*http.Response, error) {
now := getGmtIso8601(time.Now().Unix())
canonicalizedResource := "/" + bucket + "/" + objectKey + "?x-oss-process=csv/" + action
url := fmt.Sprintf("https://%s.oss-cn-hangzhou.aliyuncs.com/%s?x-oss-process=csv/" + action, bucket, objectKey)
c := &http.Client{
Transport: &http.Transport{
// Proxy: http.ProxyFromEnvironment,
TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
TLSNextProto: make(map[string]func(authority string, c *tls.Conn) http.RoundTripper),
Dial: (&net.Dialer{
Timeout: config.Timeout,
KeepAlive: config.KeepAlive,
}).Dial,
TLSHandshakeTimeout: config.TLSHandshakeTimeout,
ResponseHeaderTimeout: config.ResponseHeaderTimeout,
ExpectContinueTimeout: config.ExpectContinueTimeout,
},
}
req, err := http.NewRequest("POST", url, bytes.NewReader(content))
if err != nil {
return nil, err
}
req.Header.Set("Date", now)
req.Header.Set("Content-Length", strconv.Itoa(len(content)))
//req.Header.Set("Content-MD5", hex.EncodeToString(auth.CalcMD5(content)))
conn := Conn{
Config: config,
Client: c,
}
conn.SignHeader(req, canonicalizedResource)
resp, err := c.Do(req)
if err != nil {
return nil, err
}
return resp, nil
}
func (s *Selector) SelectQuery(bucket, objectKey string, config *Config) ([]byte, error) {
content, err := toXML(s)
if err != nil {
return nil, err
}
resp, err := getResponse(bucket, objectKey, "select", content, config)
if err != nil {
return nil, err
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, err
}
if resp.StatusCode < 200 || resp.StatusCode >= 300 {
return body, errors.New("errors returned from ali oss")
}
return body, nil
}
func (s *Selector) SelectQueryToFile(bucket, objectKey string, config *Config, f *os.File) error {
content, err := toXML(s)
if err != nil {
return err
}
resp, err := getResponse(bucket, objectKey, "select", content, config)
if err != nil {
return err
}
defer resp.Body.Close()
_, err = io.Copy(f, resp.Body)
if err != nil {
return err
}
if resp.StatusCode < 200 || resp.StatusCode >= 300 {
return errors.New("errors returned from ali oss")
}
return nil
}
func (m *Meta) SelectMeta(bucket, objectKey string, config *Config) (*MetaResponse, error) {
content, err := toXML(m)
if err != nil {
return nil, err
}
resp, err := getResponse(bucket, objectKey, "meta", content, config)
if err != nil {
return nil, err
}
resp.Body.Close()
lines, err := strconv.ParseInt(resp.Header["X-Oss-Select-Csv-Rows"][0], 10, 64)
if err != nil {
return nil, err
}
columns, err := strconv.ParseInt(resp.Header["X-Oss-Select-Csv-Columns"][0], 10, 64)
if err != nil {
return nil, err
}
splits, err := strconv.ParseInt(resp.Header["X-Oss-Select-Csv-Splits"][0], 10, 64)
if err != nil {
return nil, err
}
mr := &MetaResponse{
Lines: lines,
Columns: columns,
Splits: splits,
ContentLength: resp.ContentLength,
}
return mr, nil
}