104 lines
2.6 KiB
Go
104 lines
2.6 KiB
Go
package main
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import (
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"time"
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dl "github.com/inancgumus/learngo/30-concurrency/xxx-concurrent-downloader/fetch"
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)
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//
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// +--- transfer #1 (on done/error signals and quits)
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// |
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// UI <--+--- transfer #2
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// |
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// +--- transfer #N
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// ^
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// |
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// SESSION ------+ launches goroutines
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//
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//
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// +--- transfer #1
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// |
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// UI <--+--- transfer #2
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// |
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// +--- transfer #N
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// ^
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// |
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// SESSION ------+ launches goroutines
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//
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//
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// +--- transfer #1
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// |
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// UI <--+--- transfer #2
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// ^ |
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// | +--- transfer #N
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// | ^
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// | |
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// +--------- SESSION
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//
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// Session can close the transfers with session.Shutdown()
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// (through session.done chan)
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//
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// Session closes the watcher chan when the transfers end
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// Possible problem: If any of the transfers never quit, session will hang.
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// I think, I'm going to manage that using context.Context in the transfers.
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//
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func main() {
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// ========================================================================
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// to := time.Second * 5
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// res, err := dl.HTTPGet("https://jsonplaceholder.typicode.com/todos/1", to)
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// if err != nil {
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// fmt.Println(err)
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// return
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// }
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// defer res.Body.Close()
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// io.Copy(os.Stdout, res.Body)
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// return
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// ========================================================================
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sess := dl.NewSession()
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// simulate a manual shutdown
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// time.AfterFunc(time.Second, func() {
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// sess.Shutdown()
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// })
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to := time.Second * 5
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transfers := []dl.Transfer{
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dl.NewHTTPTransfer("https://inancgumus.github.io/samples/jpg-beach-1020x670-160kb.jpg", to),
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dl.NewHTTPTransfer("https://inancgumus.github.io/samples/jpg-beach-1020x670-610kb.jpg", to),
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dl.NewHTTPTransfer("https://inancgumus.github.io/samples/jpg-beach-1020x670-80kb.jpg", to),
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dl.NewHTTPTransfer("https://inancgumus.github.io/samples/jpg-beach-1900x1250-1700kb.jpg", to),
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}
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// transfers := []dl.Transfer{
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// dl.NewHTTPTransfer(ctx, "http://inanc.io/1"),
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// dl.NewHTTPTransfer(ctx, "http://inanc.io/2"),
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// dl.NewHTTPTransfer(ctx, "http://inanc.io/3"),
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// }
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dl.UI(sess.Start(transfers...))
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// results := dl.Drain(sess.Start(urls))
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// for _, r := range results {
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// fmt.Printf("%s [err: %v — %d/%d]\n",
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// r.URL, r.Error, r.Downloaded, r.Total)
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// }
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// how to handle ctrl+c signals?
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// register a signal
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// let the downloader now that the operation halts
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// with Downloader.onCancel or "context.Context"
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// run with: GOTRACEBACK=all go run -race main.go
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// time.Sleep(time.Second * 2)
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// panic("give me the stack trace")
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}
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