forked from TrueCloudLab/frostfs-api-go
100 lines
2.2 KiB
Go
100 lines
2.2 KiB
Go
package object
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import (
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"io"
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"strconv"
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"github.com/pkg/errors"
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)
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// FilenameHeader is a user header key for names of files, stored by third
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// party apps. We recommend to use this header to be compatible with neofs
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// http gate, neofs minio gate and neofs-dropper application.
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const FilenameHeader = "filename"
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// ByteSize used to format bytes
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type ByteSize uint64
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// String represents ByteSize in string format
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func (b ByteSize) String() string {
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var (
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dec int64
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unit string
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num = int64(b)
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)
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switch {
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case num > UnitsTB:
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unit = "TB"
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dec = UnitsTB
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case num > UnitsGB:
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unit = "GB"
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dec = UnitsGB
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case num > UnitsMB:
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unit = "MB"
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dec = UnitsMB
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case num > UnitsKB:
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unit = "KB"
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dec = UnitsKB
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default:
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dec = 1
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}
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return strconv.FormatFloat(float64(num)/float64(dec), 'g', 6, 64) + unit
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}
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// MakePutRequestHeader combines object and session token value
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// into header of object put request.
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func MakePutRequestHeader(obj *Object) *PutRequest {
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return &PutRequest{
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R: &PutRequest_Header{Header: &PutRequest_PutHeader{
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Object: obj,
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}},
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}
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}
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// MakePutRequestChunk splits data into chunks that will be transferred
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// in the protobuf stream.
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func MakePutRequestChunk(chunk []byte) *PutRequest {
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return &PutRequest{R: &PutRequest_Chunk{Chunk: chunk}}
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}
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func errMaxSizeExceeded(size uint64) error {
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return errors.Errorf("object payload size exceed: %s", ByteSize(size).String())
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}
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// ReceiveGetResponse receives object by chunks from the protobuf stream
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// and combine it into single get response structure.
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func ReceiveGetResponse(c Service_GetClient, maxSize uint64) (*GetResponse, error) {
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res, err := c.Recv()
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if err == io.EOF {
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return res, err
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} else if err != nil {
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return nil, err
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}
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obj := res.GetObject()
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if obj == nil {
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return nil, ErrHeaderExpected
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}
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if obj.SystemHeader.PayloadLength > maxSize {
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return nil, errMaxSizeExceeded(maxSize)
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}
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if res.NotFull() {
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payload := make([]byte, obj.SystemHeader.PayloadLength)
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offset := copy(payload, obj.Payload)
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var r *GetResponse
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for r, err = c.Recv(); err == nil; r, err = c.Recv() {
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offset += copy(payload[offset:], r.GetChunk())
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}
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if err != io.EOF {
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return nil, err
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}
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obj.Payload = payload
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}
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return res, nil
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}
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