Sindbad~EG File Manager

#![deny(rust_2018_idioms)]

use std::env;
use std::ffi::{OsStr, OsString};
use std::fs::File;
use std::io::{Read, Seek, SeekFrom, Write};
use std::path::{Path, PathBuf};
use tempfile::{tempdir, Builder, NamedTempFile, TempPath};

fn exists<P: AsRef<Path>>(path: P) -> bool {
    std::fs::metadata(path.as_ref()).is_ok()
}

#[test]
fn test_basic() {
    let mut tmpfile = NamedTempFile::new().unwrap();
    write!(tmpfile, "abcde").unwrap();
    tmpfile.seek(SeekFrom::Start(0)).unwrap();
    let mut buf = String::new();
    tmpfile.read_to_string(&mut buf).unwrap();
    assert_eq!("abcde", buf);
}

#[test]
fn test_deleted() {
    let tmpfile = NamedTempFile::new().unwrap();
    let path = tmpfile.path().to_path_buf();
    assert!(exists(&path));
    drop(tmpfile);
    assert!(!exists(&path));
}

#[test]
fn test_persist() {
    let mut tmpfile = NamedTempFile::new().unwrap();
    let old_path = tmpfile.path().to_path_buf();
    let persist_path = env::temp_dir().join("persisted_temporary_file");
    write!(tmpfile, "abcde").unwrap();
    {
        assert!(exists(&old_path));
        let mut f = tmpfile.persist(&persist_path).unwrap();
        assert!(!exists(&old_path));

        // Check original file
        f.seek(SeekFrom::Start(0)).unwrap();
        let mut buf = String::new();
        f.read_to_string(&mut buf).unwrap();
        assert_eq!("abcde", buf);
    }

    {
        // Try opening it at the new path.
        let mut f = File::open(&persist_path).unwrap();
        f.seek(SeekFrom::Start(0)).unwrap();
        let mut buf = String::new();
        f.read_to_string(&mut buf).unwrap();
        assert_eq!("abcde", buf);
    }
    std::fs::remove_file(&persist_path).unwrap();
}

#[test]
fn test_persist_noclobber() {
    let mut tmpfile = NamedTempFile::new().unwrap();
    let old_path = tmpfile.path().to_path_buf();
    let persist_target = NamedTempFile::new().unwrap();
    let persist_path = persist_target.path().to_path_buf();
    write!(tmpfile, "abcde").unwrap();
    assert!(exists(&old_path));
    {
        tmpfile = tmpfile.persist_noclobber(&persist_path).unwrap_err().into();
        assert!(exists(&old_path));
        std::fs::remove_file(&persist_path).unwrap();
        drop(persist_target);
    }
    tmpfile.persist_noclobber(&persist_path).unwrap();
    // Try opening it at the new path.
    let mut f = File::open(&persist_path).unwrap();
    f.seek(SeekFrom::Start(0)).unwrap();
    let mut buf = String::new();
    f.read_to_string(&mut buf).unwrap();
    assert_eq!("abcde", buf);
    std::fs::remove_file(&persist_path).unwrap();
}

#[test]
fn test_customnamed() {
    let tmpfile = Builder::new()
        .prefix("tmp")
        .suffix(&".rs")
        .rand_bytes(12)
        .tempfile()
        .unwrap();
    let name = tmpfile.path().file_name().unwrap().to_str().unwrap();
    assert!(name.starts_with("tmp"));
    assert!(name.ends_with(".rs"));
    assert_eq!(name.len(), 18);
}

#[test]
fn test_append() {
    let mut tmpfile = Builder::new().append(true).tempfile().unwrap();
    tmpfile.write_all(b"a").unwrap();
    tmpfile.seek(SeekFrom::Start(0)).unwrap();
    tmpfile.write_all(b"b").unwrap();

    tmpfile.seek(SeekFrom::Start(0)).unwrap();
    let mut buf = vec![0u8; 1];
    tmpfile.read_exact(&mut buf).unwrap();
    assert_eq!(buf, b"a");
}

#[test]
fn test_reopen() {
    let source = NamedTempFile::new().unwrap();
    let mut first = source.reopen().unwrap();
    let mut second = source.reopen().unwrap();
    drop(source);

    write!(first, "abcde").expect("write failed");
    let mut buf = String::new();
    second.read_to_string(&mut buf).unwrap();
    assert_eq!("abcde", buf);
}

#[test]
fn test_into_file() {
    let mut file = NamedTempFile::new().unwrap();
    let path = file.path().to_owned();
    write!(file, "abcde").expect("write failed");

    assert!(path.exists());
    let mut file = file.into_file();
    assert!(!path.exists());

    file.seek(SeekFrom::Start(0)).unwrap();
    let mut buf = String::new();
    file.read_to_string(&mut buf).unwrap();
    assert_eq!("abcde", buf);
}

#[test]
fn test_immut() {
    let tmpfile = NamedTempFile::new().unwrap();
    (&tmpfile).write_all(b"abcde").unwrap();
    (&tmpfile).seek(SeekFrom::Start(0)).unwrap();
    let mut buf = String::new();
    (&tmpfile).read_to_string(&mut buf).unwrap();
    assert_eq!("abcde", buf);
}

#[test]
fn test_temppath() {
    let mut tmpfile = NamedTempFile::new().unwrap();
    write!(tmpfile, "abcde").unwrap();

    let path = tmpfile.into_temp_path();
    assert!(path.is_file());
}

#[test]
fn test_temppath_persist() {
    let mut tmpfile = NamedTempFile::new().unwrap();
    write!(tmpfile, "abcde").unwrap();

    let tmppath = tmpfile.into_temp_path();

    let old_path = tmppath.to_path_buf();
    let persist_path = env::temp_dir().join("persisted_temppath_file");

    {
        assert!(exists(&old_path));
        tmppath.persist(&persist_path).unwrap();
        assert!(!exists(&old_path));
    }

    {
        // Try opening it at the new path.
        let mut f = File::open(&persist_path).unwrap();
        f.seek(SeekFrom::Start(0)).unwrap();
        let mut buf = String::new();
        f.read_to_string(&mut buf).unwrap();
        assert_eq!("abcde", buf);
    }

    std::fs::remove_file(&persist_path).unwrap();
}

#[test]
fn test_temppath_persist_noclobber() {
    let mut tmpfile = NamedTempFile::new().unwrap();
    write!(tmpfile, "abcde").unwrap();

    let mut tmppath = tmpfile.into_temp_path();

    let old_path = tmppath.to_path_buf();
    let persist_target = NamedTempFile::new().unwrap();
    let persist_path = persist_target.path().to_path_buf();

    assert!(exists(&old_path));

    {
        tmppath = tmppath.persist_noclobber(&persist_path).unwrap_err().into();
        assert!(exists(&old_path));
        std::fs::remove_file(&persist_path).unwrap();
        drop(persist_target);
    }

    tmppath.persist_noclobber(&persist_path).unwrap();

    // Try opening it at the new path.
    let mut f = File::open(&persist_path).unwrap();
    f.seek(SeekFrom::Start(0)).unwrap();
    let mut buf = String::new();
    f.read_to_string(&mut buf).unwrap();
    assert_eq!("abcde", buf);
    std::fs::remove_file(&persist_path).unwrap();
}

#[test]
fn temp_path_from_existing() {
    let tmp_dir = tempdir().unwrap();
    let tmp_file_path_1 = tmp_dir.path().join("testfile1");
    let tmp_file_path_2 = tmp_dir.path().join("testfile2");

    File::create(&tmp_file_path_1).unwrap();
    assert!(tmp_file_path_1.exists(), "Test file 1 hasn't been created");

    File::create(&tmp_file_path_2).unwrap();
    assert!(tmp_file_path_2.exists(), "Test file 2 hasn't been created");

    let tmp_path = TempPath::from_path(&tmp_file_path_1);
    assert!(
        tmp_file_path_1.exists(),
        "Test file has been deleted before dropping TempPath"
    );

    drop(tmp_path);
    assert!(
        !tmp_file_path_1.exists(),
        "Test file exists after dropping TempPath"
    );
    assert!(
        tmp_file_path_2.exists(),
        "Test file 2 has been deleted before dropping TempDir"
    );
}

#[test]
#[allow(unreachable_code)]
fn temp_path_from_argument_types() {
    // This just has to compile
    return;

    TempPath::from_path("");
    TempPath::from_path(String::new());
    TempPath::from_path(OsStr::new(""));
    TempPath::from_path(OsString::new());
    TempPath::from_path(Path::new(""));
    TempPath::from_path(PathBuf::new());
    TempPath::from_path(PathBuf::new().into_boxed_path());
}

#[test]
fn test_write_after_close() {
    let path = NamedTempFile::new().unwrap().into_temp_path();
    File::create(path).unwrap().write_all(b"test").unwrap();
}

#[test]
fn test_change_dir() {
    env::set_current_dir(env::temp_dir()).unwrap();
    let tmpfile = NamedTempFile::new_in(".").unwrap();
    let path = env::current_dir().unwrap().join(tmpfile.path());
    env::set_current_dir("/").unwrap();
    drop(tmpfile);
    assert!(!exists(path))
}

#[test]
fn test_into_parts() {
    let mut file = NamedTempFile::new().unwrap();
    write!(file, "abcd").expect("write failed");

    let (mut file, temp_path) = file.into_parts();

    let path = temp_path.to_path_buf();

    assert!(path.exists());
    drop(temp_path);
    assert!(!path.exists());

    write!(file, "efgh").expect("write failed");

    file.seek(SeekFrom::Start(0)).unwrap();
    let mut buf = String::new();
    file.read_to_string(&mut buf).unwrap();
    assert_eq!("abcdefgh", buf);
}

#[test]
fn test_from_parts() {
    let mut file = NamedTempFile::new().unwrap();
    write!(file, "abcd").expect("write failed");

    let (file, temp_path) = file.into_parts();

    let file = NamedTempFile::from_parts(file, temp_path);

    assert!(file.path().exists());
}

#[test]
fn test_keep() {
    let mut tmpfile = NamedTempFile::new().unwrap();
    write!(tmpfile, "abcde").unwrap();
    let (mut f, temp_path) = tmpfile.into_parts();
    let path;
    {
        assert!(exists(&temp_path));
        path = temp_path.keep().unwrap();
        assert!(exists(&path));

        // Check original file
        f.seek(SeekFrom::Start(0)).unwrap();
        let mut buf = String::new();
        f.read_to_string(&mut buf).unwrap();
        assert_eq!("abcde", buf);
    }

    {
        // Try opening it again.
        let mut f = File::open(&path).unwrap();
        f.seek(SeekFrom::Start(0)).unwrap();
        let mut buf = String::new();
        f.read_to_string(&mut buf).unwrap();
        assert_eq!("abcde", buf);
    }
    std::fs::remove_file(&path).unwrap();
}

#[test]
fn test_make() {
    let tmpfile = Builder::new().make(|path| File::create(path)).unwrap();

    assert!(tmpfile.path().is_file());
}

#[test]
fn test_make_in() {
    let tmp_dir = tempdir().unwrap();

    let tmpfile = Builder::new()
        .make_in(tmp_dir.path(), |path| File::create(path))
        .unwrap();

    assert!(tmpfile.path().is_file());
    assert_eq!(tmpfile.path().parent(), Some(tmp_dir.path()));
}

#[test]
fn test_make_fnmut() {
    let mut count = 0;

    // Show that an FnMut can be used.
    let tmpfile = Builder::new()
        .make(|path| {
            count += 1;
            File::create(path)
        })
        .unwrap();

    assert!(tmpfile.path().is_file());
}

#[cfg(unix)]
#[test]
fn test_make_uds() {
    use std::os::unix::net::UnixListener;

    let temp_sock = Builder::new()
        .prefix("tmp")
        .suffix(".sock")
        .rand_bytes(12)
        .make(|path| UnixListener::bind(path))
        .unwrap();

    assert!(temp_sock.path().exists());
}

#[cfg(unix)]
#[test]
fn test_make_uds_conflict() {
    use std::os::unix::net::UnixListener;
    use std::sync::atomic::{AtomicUsize, Ordering};
    use std::sync::Arc;

    // Check that retries happen correctly by racing N different threads.

    const NTHREADS: usize = 20;

    // The number of times our callback was called.
    let tries = Arc::new(AtomicUsize::new(0));

    let mut threads = Vec::with_capacity(NTHREADS);

    for _ in 0..NTHREADS {
        let tries = tries.clone();
        threads.push(std::thread::spawn(move || {
            // Ensure that every thread uses the same seed so we are guaranteed
            // to retry. Note that fastrand seeds are thread-local.
            fastrand::seed(42);

            Builder::new()
                .prefix("tmp")
                .suffix(".sock")
                .rand_bytes(12)
                .make(|path| {
                    tries.fetch_add(1, Ordering::Relaxed);
                    UnixListener::bind(path)
                })
        }));
    }

    // Join all threads, but don't drop the temp file yet. Otherwise, we won't
    // get a deterministic number of `tries`.
    let sockets: Vec<_> = threads
        .into_iter()
        .map(|thread| thread.join().unwrap().unwrap())
        .collect();

    // Number of tries is exactly equal to (n*(n+1))/2.
    assert_eq!(
        tries.load(Ordering::Relaxed),
        (NTHREADS * (NTHREADS + 1)) / 2
    );

    for socket in sockets {
        assert!(socket.path().exists());
    }
}