A simple http downloader

Features

• Multithreaded download
• Breakpoint resume
• Download speed limit
• Download speed tracking
• Add functionality through extensions

Example

```rust use std::num::{NonZeroU8, NonZeroUsize}; use std::path::PathBuf; use std::time::Duration;

use anyhow::Result; use tracing::info; use url::Url;

use httpdownloader::{ breakpointresume::DownloadBreakpointResumeExtension, HttpDownloaderBuilder, speedlimiter::DownloadSpeedLimiterExtension, speedtracker::DownloadSpeedTrackerExtension, statustracker::DownloadStatusTrackerExtension, }; use httpdownloader::bsonfilearchiver::{ArchiveFilePath, BsonFileArchiverBuilder};

[tokio::main]

async fn main() -> Result<()> { { tracing_subscriber::fmt::init(); }

let save_dir = PathBuf::from("C:/download");
let test_url = Url::parse("https://dldir1.qq.com/qqfile/qq/PCQQ9.6.9/QQ9.6.9.28878.exe")?;
let (downloader, (status_state, speed_state, speed_limiter, ..)) =
    HttpDownloaderBuilder::new(test_url, save_dir)
        .chunk_size(NonZeroUsize::new(1024 * 1024 * 10).unwrap()) // 块大小
        .download_connection_count(NonZeroU8::new(3).unwrap()) // 下载连接数
        .build((
            // 下载状态追踪扩展
            // by cargo feature "status-tracker" enable
            DownloadStatusTrackerExtension { log: true },
            // 下载速度追踪扩展
            // by cargo feature "speed-tracker" enable
            DownloadSpeedTrackerExtension { log: true },
            // 下载速度限制扩展，
            // by cargo feature "speed-limiter" enable
            DownloadSpeedLimiterExtension {
                byte_count_per: None
            },
            // 断点续传扩展，
            // by cargo feature "breakpoint-resume" enable
            DownloadBreakpointResumeExtension {
                // BsonFileArchiver by cargo feature "bson-file-archiver" enable
                download_archiver_builder: BsonFileArchiverBuilder::new(ArchiveFilePath::Suffix("bson".to_string()))
            }
        ));
info!("Start download，开始下载");
let finished_future = downloader.start().await?;

let _status = status_state.status(); // get download status， 获取状态
let _status_receiver = status_state.status_receiver; //status watcher，状态监听器
let _byte_per_second = speed_state.download_speed(); // get download speed，Byte per second，获取速度，字节每秒
let _speed_receiver = speed_state.receiver; // get download speed watcher，速度监听器

// downloader.cancel() // 取消下载

// 打印下载进度
// Print download Progress
tokio::spawn({
    let mut downloaded_len_receiver = downloader.downloaded_len_receiver().clone();
    async move {
        let total_len = downloader.total_size().await;
        if let Some(total_len) = total_len {
            info!("Total size: {:.2} Mb",total_len as f64 / 1024_f64/ 1024_f64);
        }
        while downloaded_len_receiver.changed().await.is_ok() {
            let progress = *downloaded_len_receiver.borrow();
            if let Some(total_len) = total_len {
                info!("Download Progress: {} %，{}/{}",progress*100/total_len,progress,total_len);
            }

            tokio::time::sleep(Duration::from_millis(1000)).await;
        }
    }
});

// 下载速度限制
// Download speed limit
tokio::spawn(async move {
    tokio::time::sleep(Duration::from_secs(2)).await;
    info!("Start speed limit，开始限速");
    speed_limiter.change_speed(Some(1024 * 1024 * 2)).await;
    tokio::time::sleep(Duration::from_secs(4)).await;
    info!("Remove the download speed limit，解除速度限制");
    speed_limiter.change_speed(None).await;
});

info!("Wait for download to end，等待下载结束");
let dec = finished_future.await?;
info!("Downloading end cause: {:?}", dec);
Ok(())

} ```