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export.go
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export.go
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// Copyright (C) 2023 Gobalsky Labs Limited
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package api
import (
"bytes"
"fmt"
"google.golang.org/genproto/googleapis/api/httpbody"
)
type httpBodyWriter struct {
chunkSize int
contentType string
buf *bytes.Buffer
stream tradingDataServiceExportServer
}
type tradingDataServiceExportServer interface {
Send(*httpbody.HttpBody) error
}
func (w *httpBodyWriter) Write(p []byte) (n int, err error) {
n = len(p)
w.buf.Write(p)
if w.buf.Len() >= w.chunkSize {
if err := w.sendChunk(); err != nil {
return 0, err
}
}
return n, nil
}
func (w *httpBodyWriter) sendChunk() error {
msg := &httpbody.HttpBody{
ContentType: w.contentType,
Data: w.buf.Bytes(),
}
if err := w.stream.Send(msg); err != nil {
return fmt.Errorf("error sending chunk: %w", err)
}
w.buf.Reset()
return nil
}
func (w *httpBodyWriter) Close() error {
if w.buf.Len() > 0 {
return w.sendChunk()
}
return nil
}