random-access-disk 4.0.0-alpha

Continuously read and write to disk, using random offsets and lengths
Documentation 
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use random_access_disk as rad;
use random_access_storage::RandomAccess;
use std::env;
use tempfile::Builder;

use tokio::test as async_test;

#[async_test]
// postmortem: read_exact wasn't behaving like we hoped, so we had to switch
// back to `.read()` and disable clippy for that rule specifically.
async fn regress_1() {
    let dir = Builder::new()
        .prefix("random-access-disk")
        .tempdir()
        .unwrap();
    let file = rad::RandomAccessDisk::open(dir.path().join("regression-1.db"))
        .await
        .unwrap();
    file.write(27, b"").await.unwrap();
    file.read(13, 5).await.unwrap();
}

#[async_test]
// postmortem: accessing the same file twice would fail, so we had to switch to
// from `.create_new()` to `.create()`.
//
// NOTE: test needs to be run twice in a row to trigger regression. I'm sorry.
async fn regress_2() {
    let mut dir = env::temp_dir();
    dir.push("regression-2.db");
    let file = rad::RandomAccessDisk::open(dir).await.unwrap();
    file.write(27, b"").await.unwrap();
}