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upload_operation.go
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upload_operation.go
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/**
Copyright (C) 2020 Aaron Sky.
This file is part of asc-go, a package for working with Apple's
App Store Connect API.
asc-go is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
asc-go 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with asc-go. If not, see <http://www.gnu.org/licenses/>.
*/
package asc
import (
"bytes"
"context"
"errors"
"io"
"net/http"
"sync"
)
// ErrMissingChunkBounds happens when the UploadOperation object is missing an offset or length used to mark
// what bytes in the Reader will be uploaded.
var ErrMissingChunkBounds = errors.New("could not establish bounds of upload operation")
// ErrMissingUploadDestination happens when the UploadOperation object is missing a URL or HTTP method.
var ErrMissingUploadDestination = errors.New("could not establish destination of upload operation")
// UploadOperation defines model for UploadOperation.
//
// https://developer.apple.com/documentation/appstoreconnectapi/uploadoperation
// https://developer.apple.com/documentation/appstoreconnectapi/uploading_assets_to_app_store_connect
type UploadOperation struct {
Length *int `json:"length,omitempty"`
Method *string `json:"method,omitempty"`
Offset *int `json:"offset,omitempty"`
RequestHeaders []UploadOperationHeader `json:"requestHeaders,omitempty"`
URL *string `json:"url,omitempty"`
}
// UploadOperationHeader defines model for UploadOperationHeader.
//
// https://developer.apple.com/documentation/appstoreconnectapi/uploadoperationheader
type UploadOperationHeader struct {
Name *string `json:"name,omitempty"`
Value *string `json:"value,omitempty"`
}
// UploadOperationError pairs a failed operation and its associated error so it
// can be retried later.
type UploadOperationError struct {
Operation UploadOperation
Err error
}
func (e UploadOperationError) Error() string {
return e.Err.Error()
}
// chunk returns the bytes in the file from the given offset and with the given length.
func (op *UploadOperation) chunk(f io.ReadSeeker) (io.Reader, error) {
if op.Offset == nil || op.Length == nil {
return nil, ErrMissingChunkBounds
}
_, err := f.Seek(int64(*op.Offset), 0)
if err != nil {
return nil, err
}
data := make([]byte, *op.Length)
_, err = f.Read(data)
if err != nil {
return nil, err
}
return bytes.NewBuffer(data), nil
}
// request creates a new http.request instance from the given UploadOperation and buffer.
func (op *UploadOperation) request(ctx context.Context, data io.Reader) (*http.Request, error) {
if op.Method == nil || op.URL == nil {
return nil, ErrMissingUploadDestination
}
req, err := http.NewRequestWithContext(ctx, *op.Method, *op.URL, data)
if err != nil {
return nil, err
}
if op.RequestHeaders != nil {
for _, h := range op.RequestHeaders {
if h.Name == nil || h.Value == nil {
continue
}
req.Header.Add(*h.Name, *h.Value)
}
}
return req, nil
}
// Upload takes a file path and concurrently uploads each part of the file to App Store Connect.
func (c *Client) Upload(ctx context.Context, ops []UploadOperation, file io.ReadSeeker) error {
var wg sync.WaitGroup
errs := make(chan UploadOperationError)
for i, operation := range ops {
chunk, err := operation.chunk(file)
if err != nil {
errs <- UploadOperationError{
Operation: operation,
Err: err,
}
continue
}
wg.Add(1)
go c.uploadChunk(ctx, ops[i], chunk, errs, &wg)
}
go func() {
wg.Wait()
close(errs)
}()
for err := range errs {
return err
}
return nil
}
func (c *Client) uploadChunk(ctx context.Context, op UploadOperation, chunk io.Reader, errs chan<- UploadOperationError, wg *sync.WaitGroup) {
defer wg.Done()
req, err := op.request(ctx, chunk)
if err != nil {
errs <- UploadOperationError{
Operation: op,
Err: err,
}
return
}
_, err = c.do(ctx, req, nil)
if err != nil {
errs <- UploadOperationError{
Operation: op,
Err: err,
}
}
}