FSH.NewId 23.2.0

.NET 7.0
dotnet add package FSH.NewId --version 23.2.0
NuGet\Install-Package FSH.NewId -Version 23.2.0
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package.
<PackageReference Include="FSH.NewId" Version="23.2.0" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add FSH.NewId --version 23.2.0
#r "nuget: FSH.NewId, 23.2.0"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package.
// Install FSH.NewId as a Cake Addin
#addin nuget:?package=FSH.NewId&version=23.2.0

// Install FSH.NewId as a Cake Tool
#tool nuget:?package=FSH.NewId&version=23.2.0

What is it

NewId can be used as an embedded unique ID generator that produces 128 bit (16 bytes) sequential IDs. It is inspired from snowflake and flake. Read on to learn more.

The Problem

A number of applications use unique identifiers to identify a data record. A common way for apps that use a relational database (RDBMS) is to delegate the generation of these IDs to the database - by means of a Identity column (MS-SQL) or similar. This approach is fine for a small app, but quickly becomes a bottleneck at web-scale. See this post from the blokes at twitter: https://blog.twitter.com/2010/announcing-snowflake Another use case is apps that use messaging to communicate between themselves - as is the case with a Microservices based architecture. These apps may require sequential unique IDs for messages.

An attempt at solutions

A trivial approach is to use GUIDs/UUIDs generated in applications. While that works, in most frameworks GUIDs are not sequential. This takes away the ability to sort records based on their unique ids.

The Solution

The Erlang library flake (https://github.com/boundary/flake) adopted an approach of generating 128-bit, k-ordered ids (read time-ordered lexically) using the machines MAC, timestamp and a per thread sequence number. These IDs are sequential and wouldn't collide in a cluster of nodes running applicaitons that use these as UUIDs.

Sample Code

NewId id = NewId.Next(); //produces an id like {11790000-cf25-b808-dc58-08d367322210}

// Supports operations similar to GUID
NewId id = NewId.Next().ToString("D").ToUpperInvariant();
// Produces 11790000-CF25-B808-2365-08D36732603A

// Start from an id
NewId id = new NewId("11790000-cf25-b808-dc58-08d367322210");

// Start with a byte-array
var bytes = new byte[] { 16, 23, 54, 74, 21, 14, 75, 32, 44, 41, 31, 10, 11, 12, 86, 42 };
NewId theId = new NewId(bytes);

When NOT to use sequential IDs

(Adapted from the flake readme) The generated ids are predictable by design. They should not be used in scenarios where unpredictability is a desired feature. These IDs should NOT be used for:

  • Generating passwords
  • Security tokens
  • Anything else you wouldn't want someone to be able to guess.

NewId generated ids expose the identity of the machine which generated the id (by way of its MAC address) and the time at which it did so. This could be a problem for some security-sensitive applications.

Don't do modulo 2 arithmetic on flake ids with the expectation of random distribution.

Product Compatible and additional computed target framework versions.
.NET net7.0 is compatible.  net7.0-android was computed.  net7.0-ios was computed.  net7.0-maccatalyst was computed.  net7.0-macos was computed.  net7.0-tvos was computed.  net7.0-windows was computed. 
Compatible target framework(s)
Additional computed target framework(s)
Learn more about Target Frameworks and .NET Standard.
  • net7.0

    • No dependencies.

NuGet packages

This package is not used by any NuGet packages.

GitHub repositories

This package is not used by any popular GitHub repositories.

Version Downloads Last updated
23.2.0 253 2/24/2023