rusty_ulid

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Rust ULID (Universally Unique Lexicographically Sortable Identifier) generation and processing

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# rusty_ulid

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This is a Rust implementation of the [ULID][ulid] Universally Unique Lexicographically Sortable Identifiers.

This crate works with **Rust 1.88 or later**.

Take a look at the [changelog][changelog] for a detailed list of all changes.

## Features
- lenient parsing of ULID strings as specified in [Crockford Base32 Encoding][crockford].
- straight-forward creation of string and binary ULIDs.
- support for monotonic ULIDs.
- conversion from `&[u8]`.
- conversion to and from `[u8; 16]`.
- conversion to and from `(u64, u64)`.
- conversion to and from `u128`.
- optional [serde](https://crates.io/crates/serde) support for both human-readable and binary encoding.
- optional use of either [chrono](https://crates.io/crates/chrono) or [time](https://crates.io/crates/time).
- optional [rocket](https://crates.io/crates/rocket) path/query parameter and form value parsing support.
- optional [schemars](https://crates.io/crates/schemars) `JsonSchema` trait impl for `Ulid`.

## Quickstart

```rust
use rusty_ulid::generate_ulid_string;
use rusty_ulid::generate_ulid_bytes;

// Generate a ULID string
let ulid_string: String = generate_ulid_string();
assert_eq!(ulid_string.len(), 26);

// Generate ULID bytes
let ulid_bytes: [u8; 16] = generate_ulid_bytes();
assert_eq!(ulid_bytes.len(), 16);
```

```rust
use std::str::FromStr;
use rusty_ulid::Ulid;

// Generate a ULID
let ulid = Ulid::generate();

// Generate a string for a ULID
let ulid_string = ulid.to_string();

// Create ULID from a string
let result = Ulid::from_str(&ulid_string);

assert_eq!(Ok(ulid), result);
```

```rust
use rusty_ulid::Ulid;

// Alternative way to parse a ULID string
// This example assumes a function returning a Result.
let ulid: Ulid = "01CAT3X5Y5G9A62FH1FA6T9GVR".parse()?;

let datetime = ulid.datetime();
assert_eq!(datetime.to_string(), "2018-04-11 10:27:03.749 UTC");
# Ok::<(), rusty_ulid::DecodingError>(())
```

Monotonic ULIDs are supported via `Ulid::next_monotonic(previous_ulid) -> Ulid` and
`Ulid::next_strictly_monotonic(previous_ulid) -> Option<Ulid>`.

`next_monotonic` allows overflow of the random part to zero while `next_strictly_monotonic`
returns `None` instead.

## Benchmark

Run the benchmarks by executing `cargo bench`.

## Choosing the right optional features

Parsing and handling ULIDs does not require any dependencies.

Generating ULIDs requires the `rand` crate as well as either the `time` or the `chrono` crate. If both `time` and `chrono` are enabled, the `time` crate will be used to obtain the current time.

The `serde` dependency is necessary to enable `serde` support.

The following dependencies are enabled by default: `["rand", "time", "serde"]`

You can change this by disabling `default-features` and defining the enabled features explicitly like this:

```ignore
[dependencies]
rusty_ulid = { version = "2", default-features = false, features = ["rand", "chrono", "serde"] }
```

## Executable

Install the executable by executing `cargo install --path .` or `cargo install --path . --force` if a prior version was already installed.

### `rusty_ulid` usage examples

Just calling the executable generates a ULID.

```console
$ rusty_ulid
01CB2EM1J4EMBWRBJK877TM17S
```

Calling the executable with `-v` or `--verbose` generates a ULID and prints its timestamp.

```console
$ rusty_ulid -v
01CB2EMMMV8P51SCR9ZH8K64CX
2018-04-14T16:08:33.691Z

```

Calling the executable with any number of ULIDs checks them for validity and returns `0` if they are all fine...

```console
$ rusty_ulid 01CB2EM1J4EMBWRBJK877TM17S 01CB2EMMMV8P51SCR9ZH8K64CX
$ echo $?
0
```

... or `1` if any given value is invalid, printing the invalid values to `err`.

```console
$ rusty_ulid 01CB2EM1J4EMBWRBJK877TM17S foo 01CB2EMMMV8P51SCR9ZH8K64CX
Invalid ULID strings: ["foo"]
$ echo $?
1
```

In addition to that, `-v` or `--verbose` will print the ULIDs with their respective timestamp.

```console
$ rusty_ulid -v 01CB2EM1J4EMBWRBJK877TM17S foo 01CB2EMMMV8P51SCR9ZH8K64CX
01CB2EM1J4EMBWRBJK877TM17S
2018-04-14T16:08:14.148Z

01CB2EMMMV8P51SCR9ZH8K64CX
2018-04-14T16:08:33.691Z

Invalid ULID strings: ["foo"]

$ echo $?
1
```

Executing `rusty_ulid -h` will print the help.

## License

Licensed under either of

* Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
 * MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)

at your option.

### Licensing

Unless you explicitly state otherwise, any contribution intentionally submitted
for inclusion in the work by you, as defined in the Apache-2.0 license, shall be
dual licensed as above, without any additional terms or conditions.

[ulid]: https://github.com/ulid/spec
[crockford]: https://crockford.com/wrmg/base32.html
[changelog]: https://github.com/huxi/rusty_ulid/blob/main/CHANGELOG.md

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