// downloadAll() orchestrates downloading all known reports concurrently.
// It returns an error if there is a problem logging in.
func downloadAll() error {
downloader, err := download.New(*site, *email, *password)
if err != nil {
return errors.New("Failed to initialize downloader: " + err.Error())
}
var wg sync.WaitGroup
// Store download functions in a slice to simplify concurrent downloading.
downloadFunctions := []func(*download.Downloader){
downloadSoldItemsReport,
downloadStockItemsReport,
}
// Call each download function concurrently.
// A sync.WaitGroup is used to make sure the function does not return
// until all downloads are finished.
for _, df := range downloadFunctions {
wg.Add(1)
go func(f func(*download.Downloader)) {
defer wg.Done()
f(downloader)
}(df)
}
wg.Wait()
return nil
}
// Download the stock items report to the given directory.
// Returns the path to the report as a string.
// Error is non-nil if something goes wrong.
func downloadStockItemsReport(dir string) (string, error) {
// downloader should be passed into the function if more
// reports are necessary in the future.
downloader, err := download.New(*site, *email, *password)
if err != nil {
return "", errors.New("Failed to initialize downloader: " + err.Error())
}
stockItemsPath := path.Join(dir, "stock_items.csv")
err = downloader.GetStockItemsReport(stockItemsPath)
if err != nil {
return "", errors.New("Failed to get Stock Items report: " + err.Error())
}
return stockItemsPath, nil
}