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GitObjectDb.SystemTextJson 0.3.11-alpha

GitObjectDb simplifies the configuration management versioning by backing it in Git.

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Overview

GitObjectDb is designed to simplify the configuration management versioning. It does so by removing the need for hand-coding the commands needed to interact with Git.

The Git repository is used as a pure database as the files containing the serialized copy of the objects are never fetched in the filesystem. GitObjectDb only uses the blob storage provided by Git.

Here's a simple example:

1. Define your own repository data model:

   [GitFolder("Applications")]
   public record Application : Node
   {
    public string Name { get; init; }
   
    public string Description { get; init; }
   }
   [GitFolder("Pages")]
   public record Table : Node
   {
    public string Name { get; init; }
   
    public string Description { get; init; }
   
    [StoreAsSeparateFile(Extension = "txt")]
    public string? RichContent { get; init; }
   }
   

2. Manipulate objects as follows:

    var existingApplication = connection.Lookup<Application>("main", "applications", new UniqueId(id));
    var newTable = new Table { ... };
    connection
    .Update("main", c => c.CreateOrUpdate(newTable, parent: existingApplication))
    	.Commit(new("Added new table.", author, committer));
   

Features

Structured & unstructured data storage

var node = new SomeNode
{
 SomeProperty = "Value stored as json",
 RichContent = "Value stored as raw text in separate Git blob, next to primary one",
}:

... gets stored in Git as follows:

• zerzrzrz.json

{
 "$type": "Sample.SomeNode",
 "id": "zerzrzrz",
 "someProperty": "Value stored as json"
}

• zerzrzrz.RichContent.txt

Value stored many dynamic resources in separate Git blob, next to primary one

You can also store resources as separate files:

new Resource(node, "Some/Folder", "File.txt", new Resource.Data("Value stored in a separate file in <node path>/Resources/Some/Folder/File.txt"));

Branching

connection
 .Update("main", c => c.CreateOrUpdate(table with { Description = newDescription }))
 .Commit(new("Some message", signature, signature));
connection.Checkout("newBranch", "main~1");
connection
 .Update("main", c => c.CreateOrUpdate(table with { Name = newName }))
 .Commit(new("Another message", signature, signature));

Comparing commits

var comparison = connection.Compare("main~5", "main");
var nodeChanges = comparison.Modified.OfType<Change.NodeChange>();

Node references

Node references allows linking existing nodes in a repository:

public record Order : Node
{
 public Client Client { get; set; }
 // ...
}
public record Client : Node
{
 // ...
}
// Nodes get loaded with their references (using a shared )
var cache = new Dictionary<DataPath, ITreeItem>();
var order = connection.GetNodes<Order>("main", referenceCache: cache).First();
Console.WriteLine(order.Client.Id);

Merge, Rebase, Cherry-pick

// main: A---B A---B
// \ -> \ \
// newBranch: C C---x

connection
 .Update("main", c => c.CreateOrUpdate(table with { Description = newDescription }))
 .Commit(new("B", signature, signature));
connection.Repository.Branches.Add("newBranch", "main~1");
connection
 .Update("newBranch", c => c.CreateOrUpdate(table with { Name = newName }))
 .Commit(new("C", signature, signature));

sut.Merge(upstreamCommittish: "main");

Node versioning management

Imagine a scenario where you define in your code a first type:

[GitFolder(FolderName = "Items", UseNodeFolders = false)]
[IsDeprecatedNodeType(typeof(SomeNodeV2))]
private record SomeNodeV1 : Node
{
 public int Flags { get; set; }
}

[GitFolder(FolderName = "Items", UseNodeFolders = false)]
private record SomeNodeV2 : Node
{
 public BindingFlags TypedFlags { get; set; }
}

You then want to introduce a new change so that the Flags property contains more meaningful information, relying on enums:

[GitFolder(FolderName = "Items", UseNodeFolders = false)]
private record SomeNodeV2 : Node
{
 public BindingFlags TypedFlags { get; set; }
}

All you need to do is to #1 add the [IsDeprecatedNodeType(typeof(SomeNodeV2))] attribute. This will instruct the deserializer to convert nodes to new version, using a converter. #2 converter needs to be provided in the model. You can use AutoMapper or other tools at your convenience.

[GitFolder(FolderName = "Items", UseNodeFolders = false)]
[IsDeprecatedNodeType(typeof(SomeNodeV2))]
private record SomeNodeV1 : Node
{
 // ...
}
var model = new ConventionBaseModelBuilder()
 .RegisterType<SomeNodeV1>()
 .RegisterType<SomeNodeV2>()
 .AddDeprecatedNodeUpdater(UpdateDeprecatedNode)
 .Build();
Node UpdateDeprecatedNode(Node old, Type targetType)
{
 var nodeV1 = (SomeNodeV1)old;
 return new SomeNodeV2
 {
 Id = old.Id,
 TypedFlags = (BindingFlags)nodeV1.Flags,
 };
}

Documentation

See documentation.

Prerequisites

• .NET Standard 2.0 or 2.1

Online resources

• LibGit2Sharp (Requires NuGet 2.7+)

Quick contributing guide

• Fork and clone locally
• Create a topic specific branch. Add some nice feature. Do not forget the tests 😉
• Send a Pull Request to spread the fun!

License

The MIT license (Refer to the LICENSE file).