Source File
	web.go

Belonging Package
	github.com/gotd/td/telegram/downloader

package downloader

import (
	"context"

	"github.com/go-faster/errors"

	"github.com/gotd/td/tg"
)

var errHashesNotSupported = errors.New("this schema does not support hashes fetch")

// web is a web file download schema.
// See https://core.telegram.org/api/files#downloading-webfiles.
type web struct {
	client Client
	// retryHandler observes retried transient downloader errors.
	retryHandler RetryHandler

	location tg.InputWebFileLocationClass
}

var _ schema = web{}

func (w web) reportRetry(operation string, attempt int, err error) {
	if attempt < 1 || err == nil || w.retryHandler == nil {
		return
	}
	w.retryHandler(RetryEvent{
		Operation: operation,
		Attempt:   attempt,
		Err:       err,
	})
}

func (w web) Chunk(ctx context.Context, offset int64, limit int) (chunk, error) {
	file, err := w.client.UploadGetWebFile(ctx, &tg.UploadGetWebFileRequest{
		Location: w.location,
		Offset:   int(offset),
		Limit:    limit,
	})
	if err != nil {
		return chunk{}, err
	}

	return chunk{data: file.Bytes, tag: file.FileType}, nil
}

func (w web) Hashes(ctx context.Context, offset int64) ([]tg.FileHash, error) {
	return nil, errHashesNotSupported
}

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