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package cos
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import (
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"bytes"
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"context"
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"encoding/binary"
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"encoding/xml"
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"fmt"
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"hash/crc32"
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"io"
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"io/ioutil"
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"net/http"
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"os"
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"time"
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)
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type JSONInputSerialization struct {
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Type string `xml:"Type,omitempty"`
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}
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type CSVInputSerialization struct {
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RecordDelimiter string `xml:"RecordDelimiter,omitempty"`
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FieldDelimiter string `xml:"FieldDelimiter,omitempty"`
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QuoteCharacter string `xml:"QuoteCharacter,omitempty"`
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QuoteEscapeCharacter string `xml:"QuoteEscapeCharacter,omitempty"`
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AllowQuotedRecordDelimiter string `xml:"AllowQuotedRecordDelimiter,omitempty"`
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FileHeaderInfo string `xml:"FileHeaderInfo,omitempty"`
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Comments string `xml:"Comments,omitempty"`
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}
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type SelectInputSerialization struct {
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CompressionType string `xml:"CompressionType,omitempty"`
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CSV *CSVInputSerialization `xml:"CSV,omitempty"`
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JSON *JSONInputSerialization `xml:"JSON,omitempty"`
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}
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type JSONOutputSerialization struct {
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RecordDelimiter string `xml:"RecordDelimiter,omitempty"`
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}
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type CSVOutputSerialization struct {
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QuoteFields string `xml:"QuoteFields,omitempty"`
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RecordDelimiter string `xml:"RecordDelimiter,omitempty"`
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FieldDelimiter string `xml:"FieldDelimiter,omitempty"`
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QuoteCharacter string `xml:"QuoteCharacter,omitempty"`
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QuoteEscapeCharacter string `xml:"QuoteEscapeCharacter,omitempty"`
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}
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type SelectOutputSerialization struct {
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CSV *CSVOutputSerialization `xml:"CSV,omitempty"`
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JSON *JSONOutputSerialization `xml:"JSON,omitempty"`
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}
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type ObjectSelectOptions struct {
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XMLName xml.Name `xml:"SelectRequest"`
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Expression string `xml:"Expression"`
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ExpressionType string `xml:"ExpressionType"`
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InputSerialization *SelectInputSerialization `xml:"InputSerialization"`
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OutputSerialization *SelectOutputSerialization `xml:"OutputSerialization"`
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RequestProgress string `xml:"RequestProgress>Enabled,omitempty"`
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}
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func (s *ObjectService) Select(ctx context.Context, name string, opt *ObjectSelectOptions) (io.ReadCloser, error) {
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u := fmt.Sprintf("/%s?select&select-type=2", encodeURIComponent(name))
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sendOpt := sendOptions{
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baseURL: s.client.BaseURL.BucketURL,
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uri: u,
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method: http.MethodPost,
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body: opt,
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disableCloseBody: true,
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}
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resp, err := s.client.send(ctx, &sendOpt)
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if err != nil {
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return nil, err
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}
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result := &ObjectSelectResponse{
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Headers: resp.Header,
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Body: resp.Body,
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StatusCode: resp.StatusCode,
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Frame: &ObjectSelectResult{
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NextFrame: true,
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Payload: []byte{},
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},
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Finish: false,
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}
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return result, nil
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}
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func (s *ObjectService) SelectToFile(ctx context.Context, name, file string, opt *ObjectSelectOptions) (*ObjectSelectResponse, error) {
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resp, err := s.Select(ctx, name, opt)
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if err != nil {
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return nil, err
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}
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res, _ := resp.(*ObjectSelectResponse)
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defer func() {
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io.Copy(ioutil.Discard, resp)
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resp.Close()
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}()
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fd, err := os.OpenFile(file, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, os.FileMode(0664))
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if err != nil {
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return res, err
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}
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_, err = io.Copy(fd, resp)
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fd.Close()
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res.Finish = true
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return res, err
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}
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const (
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kReadTimeout = 3
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kMessageType = ":message-type"
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kEventType = ":event-type"
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kContentType = ":content-type"
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kRecordsFrameType = iota
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kContinuationFrameType
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kProgressFrameType
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kStatsFrameType
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kEndFrameType
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kErrorFrameType
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)
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type ProgressFrame struct {
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XMLName xml.Name `xml:"Progress"`
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BytesScanned int `xml:"BytesScanned"`
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BytesProcessed int `xml:"BytesProcessed"`
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BytesReturned int `xml:"BytesReturned"`
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}
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type StatsFrame struct {
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XMLName xml.Name `xml:"Stats"`
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BytesScanned int `xml:"BytesScanned"`
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BytesProcessed int `xml:"BytesProcessed"`
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BytesReturned int `xml:"BytesReturned"`
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}
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type DataFrame struct {
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ContentType string
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ConsumedBytesLength int32
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LeftBytesLength int32
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}
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type ErrorFrame struct {
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Code string
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Message string
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}
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func (e *ErrorFrame) Error() string {
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return fmt.Sprintf("Error Code: %s, Error Message: %s", e.Code, e.Message)
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}
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type ObjectSelectResult struct {
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TotalFrameLength int32
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TotalHeaderLength int32
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NextFrame bool
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FrameType int
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Payload []byte
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DataFrame DataFrame
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ProgressFrame ProgressFrame
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StatsFrame StatsFrame
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ErrorFrame *ErrorFrame
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}
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type ObjectSelectResponse struct {
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StatusCode int
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Headers http.Header
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Body io.ReadCloser
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Frame *ObjectSelectResult
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Finish bool
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}
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func (osr *ObjectSelectResponse) Read(p []byte) (n int, err error) {
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n, err = osr.readFrames(p)
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return
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}
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func (osr *ObjectSelectResponse) Close() error {
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return osr.Body.Close()
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}
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func (osr *ObjectSelectResponse) readFrames(p []byte) (int, error) {
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if osr.Finish {
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return 0, io.EOF
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}
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if osr.Frame.ErrorFrame != nil {
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return 0, osr.Frame.ErrorFrame
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}
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var err error
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var nlen int
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dlen := len(p)
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for nlen < dlen {
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if osr.Frame.NextFrame == true {
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osr.Frame.NextFrame = false
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err := osr.analysisPrelude()
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if err != nil {
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return nlen, err
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}
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err = osr.analysisHeader()
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if err != nil {
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return nlen, err
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}
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}
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switch osr.Frame.FrameType {
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case kRecordsFrameType:
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n, err := osr.analysisRecords(p[nlen:])
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if err != nil {
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return nlen, err
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}
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nlen += n
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case kContinuationFrameType:
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err = osr.payloadChecksum("ContinuationFrame")
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if err != nil {
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return nlen, err
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}
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case kProgressFrameType:
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err := osr.analysisXml(&osr.Frame.ProgressFrame)
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if err != nil {
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return nlen, err
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}
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case kStatsFrameType:
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err := osr.analysisXml(&osr.Frame.StatsFrame)
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if err != nil {
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return nlen, err
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}
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case kEndFrameType:
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err = osr.payloadChecksum("EndFrame")
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if err != nil {
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return nlen, err
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}
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osr.Finish = true
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return nlen, io.EOF
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case kErrorFrameType:
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return nlen, osr.Frame.ErrorFrame
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}
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}
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return nlen, err
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}
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func (osr *ObjectSelectResponse) analysisPrelude() error {
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frame := make([]byte, 12)
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_, err := osr.fixedLengthRead(frame, kReadTimeout)
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if err != nil {
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return err
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}
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var preludeCRC uint32
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bytesToInt(frame[0:4], &osr.Frame.TotalFrameLength)
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bytesToInt(frame[4:8], &osr.Frame.TotalHeaderLength)
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bytesToInt(frame[8:12], &preludeCRC)
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osr.Frame.Payload = append(osr.Frame.Payload, frame...)
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return checksum(frame[0:8], preludeCRC, "Prelude")
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}
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func (osr *ObjectSelectResponse) analysisHeader() error {
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var nlen int32
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headers := make(map[string]string)
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for nlen < osr.Frame.TotalHeaderLength {
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var headerNameLen int8
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var headerValueLen int16
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bHeaderNameLen := make([]byte, 1)
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_, err := osr.fixedLengthRead(bHeaderNameLen, kReadTimeout)
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if err != nil {
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return err
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}
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nlen += 1
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bytesToInt(bHeaderNameLen, &headerNameLen)
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osr.Frame.Payload = append(osr.Frame.Payload, bHeaderNameLen...)
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bHeaderName := make([]byte, headerNameLen)
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_, err = osr.fixedLengthRead(bHeaderName, kReadTimeout)
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if err != nil {
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return err
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}
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nlen += int32(headerNameLen)
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headerName := string(bHeaderName)
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osr.Frame.Payload = append(osr.Frame.Payload, bHeaderName...)
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bValueTypeLen := make([]byte, 3)
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_, err = osr.fixedLengthRead(bValueTypeLen, kReadTimeout)
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if err != nil {
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return err
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}
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nlen += 3
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bytesToInt(bValueTypeLen[1:], &headerValueLen)
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osr.Frame.Payload = append(osr.Frame.Payload, bValueTypeLen...)
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bHeaderValue := make([]byte, headerValueLen)
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_, err = osr.fixedLengthRead(bHeaderValue, kReadTimeout)
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if err != nil {
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return err
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}
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nlen += int32(headerValueLen)
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headers[headerName] = string(bHeaderValue)
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osr.Frame.Payload = append(osr.Frame.Payload, bHeaderValue...)
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}
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htype, ok := headers[kMessageType]
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if !ok {
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return fmt.Errorf("header parse failed, no message-type, headers: %+v\n", headers)
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}
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switch {
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case htype == "error":
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osr.Frame.FrameType = kErrorFrameType
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osr.Frame.ErrorFrame = &ErrorFrame{}
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osr.Frame.ErrorFrame.Code, _ = headers[":error-code"]
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osr.Frame.ErrorFrame.Message, _ = headers[":error-message"]
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case htype == "event":
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hevent, ok := headers[kEventType]
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if !ok {
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return fmt.Errorf("header parse failed, no event-type, headers: %+v\n", headers)
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}
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switch {
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case hevent == "Records":
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hContentType, ok := headers[kContentType]
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if ok {
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osr.Frame.DataFrame.ContentType = hContentType
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}
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osr.Frame.FrameType = kRecordsFrameType
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case hevent == "Cont":
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osr.Frame.FrameType = kContinuationFrameType
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case hevent == "Progress":
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osr.Frame.FrameType = kProgressFrameType
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case hevent == "Stats":
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osr.Frame.FrameType = kStatsFrameType
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case hevent == "End":
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osr.Frame.FrameType = kEndFrameType
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default:
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return fmt.Errorf("header parse failed, invalid event-type, headers: %+v\n", headers)
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}
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default:
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return fmt.Errorf("header parse failed, invalid message-type: headers: %+v\n", headers)
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}
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return nil
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}
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func (osr *ObjectSelectResponse) analysisRecords(data []byte) (int, error) {
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var needReadLength int32
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dlen := int32(len(data))
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restLen := osr.Frame.TotalFrameLength - 16 - osr.Frame.TotalHeaderLength - osr.Frame.DataFrame.ConsumedBytesLength
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if dlen <= restLen {
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needReadLength = dlen
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} else {
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needReadLength = restLen
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}
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n, err := osr.fixedLengthRead(data[:needReadLength], kReadTimeout)
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if err != nil {
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return n, fmt.Errorf("read data frame error: %s", err.Error())
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}
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osr.Frame.DataFrame.ConsumedBytesLength += int32(n)
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osr.Frame.Payload = append(osr.Frame.Payload, data[:needReadLength]...)
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// 读完了一帧数据并填充到data中了
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if osr.Frame.DataFrame.ConsumedBytesLength == osr.Frame.TotalFrameLength-16-osr.Frame.TotalHeaderLength {
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osr.Frame.DataFrame.ConsumedBytesLength = 0
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err = osr.payloadChecksum("RecordFrame")
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}
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return n, err
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}
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func (osr *ObjectSelectResponse) analysisXml(frame interface{}) error {
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payloadLength := osr.Frame.TotalFrameLength - 16 - osr.Frame.TotalHeaderLength
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bFrame := make([]byte, payloadLength)
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_, err := osr.fixedLengthRead(bFrame, kReadTimeout)
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if err != nil {
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return err
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}
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err = xml.Unmarshal(bFrame, frame)
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if err != nil {
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return err
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}
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osr.Frame.Payload = append(osr.Frame.Payload, bFrame...)
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return osr.payloadChecksum("XmlFrame")
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}
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// 调用payloadChecksum时，表示该帧已读完，开始读取下一帧内容
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func (osr *ObjectSelectResponse) payloadChecksum(ftype string) error {
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bcrc := make([]byte, 4)
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_, err := osr.fixedLengthRead(bcrc, kReadTimeout)
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if err != nil {
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return err
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}
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var res uint32
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bytesToInt(bcrc, &res)
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err = checksum(osr.Frame.Payload, res, ftype)
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osr.Frame.NextFrame = true
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osr.Frame.Payload = []byte{}
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return err
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}
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type chanReadIO struct {
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readLen int
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err error
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}
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func (osr *ObjectSelectResponse) fixedLengthRead(p []byte, read_timeout int64) (int, error) {
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timeout := time.Duration(read_timeout)
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r := osr.Body
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ch := make(chan chanReadIO, 1)
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go func(p []byte) {
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var needLen int
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readChan := chanReadIO{}
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needLen = len(p)
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for {
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n, err := r.Read(p[readChan.readLen:needLen])
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readChan.readLen += n
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if err != nil {
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readChan.err = err
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ch <- readChan
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close(ch)
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return
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}
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if readChan.readLen == needLen {
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break
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}
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}
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ch <- readChan
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close(ch)
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}(p)
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select {
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case <-time.After(time.Second * timeout):
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return 0, fmt.Errorf("requestId: %s, readLen timeout, timeout is %d(second),need read:%d", osr.Headers.Get("x-cos-request-id"), timeout, len(p))
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case result := <-ch:
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return result.readLen, result.err
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}
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}
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func bytesToInt(b []byte, ret interface{}) {
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binBuf := bytes.NewBuffer(b)
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binary.Read(binBuf, binary.BigEndian, ret)
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}
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func checksum(b []byte, rec uint32, ftype string) error {
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c := crc32.ChecksumIEEE(b)
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if c != rec {
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return fmt.Errorf("parse type: %v, checksum failed, cal: %v, rec: %v\n", ftype, c, rec)
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}
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return nil
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}
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