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@hokita hokita commented Jul 26, 2020

課題3-2

分割ダウンローダを作ろう

  • 分割ダウンロードを行う
    • Rangeアクセスを用いる
    • いくつかのゴルーチンでダウンロードしてマージする
    • エラー処理を工夫する
    • golang.org/x/sync/errgourpパッケージなどを使ってみる
    • キャンセルが発生した場合の実装を行う

動作

$ go build -o pdl cmd/pdl/main.go

$ ./pdl -proc 10 https://blog.golang.org/gopher/header.jpg
start download worker: 1
start download worker: 10
start download worker: 4
start download worker: 2
start download worker: 5
start download worker: 7
start download worker: 9
start download worker: 6
start download worker: 3
start download worker: 8
finish download worker: 4
finish download worker: 8
finish download worker: 5
finish download worker: 3
finish download worker: 7
finish download worker: 9
finish download worker: 1
finish download worker: 10
finish download worker: 2
finish download worker: 6
finished

$ ls testdata/header.jpg
testdata/header.jpg

わからなかったこと、むずかしかったこと

  • そもそもurlからダウンロードをどう実現するのかを考えるのに時間がかかった。
    • pgetを参考にした。
    • 結局はurlでアクセスして読み込んだ情報(io.Reader)をファイルに書き込む(io.writer)だけだった。

@hokita hokita added the kadai3-2 課題3-2 label Jul 26, 2020
@hokita hokita changed the title 課題3-2対応 hokita / 課題3-2 Jul 26, 2020
軽微な修正
8a22f31 
- testdataに.gitkeepを追加
- おかしなコメントを修正
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