LaunchDarkly Streaming JSON for .NET

Overview

The LaunchDarkly.JsonStream library implements a streaming approach to JSON encoding and decoding designed for efficiency at high volume, assuming a text encoding of UTF8. Unlike reflection-based frameworks, it has no knowledge of structs or other complex types; you must explicitly tell it what values and properties to write or read. It was implemented for the LaunchDarkly server-side .NET SDK and LaunchDarkly client-side .NET SDK, but may be useful in other applications.

Supported .NET versions and platform differences

This version of the SDK is built for the following targets:

• .NET 6.0
• .NET 5.0
• .NET Core 3.1
• .NET Core 2.1
• .NET Framework 4.5.2
• .NET Framework 4.6.1 (also works on .NET Framework 4.7)
• .NET Standard 2.0 (used on other platforms such as Xamarin)

System.Text.Json support

All builds of LaunchDarkly.JsonStream except for .NET Framework 4.5.2 and .NET Standard 2.0 make use of the System.Text.Json API, which is built into the standard runtime library for .NET Core 3.x and .NET 5.x and is imported as a NuGet package on other platforms. Any types that use the LaunchDarkly.JsonStream.JsonStreamConverter attribute will automatically be recognized by System.Text.Json's reflection-based APIs.

The .NET Framework and .NET Standard 2.0 builds of LaunchDarkly.JsonStream use a different portable implementation that is not as fast as System.Text.Json, but still highly efficient. System.Text.Json is not available for .NET Framework 4.5.2. It is available for .NET Standard 2.0, but the .NET Standard 2.0 target of LaunchDarkly.JsonStream is also used in Xamarin, and System.Text.Json currently has compatibility problems with Xamarin.

The external API of the library is the same regardless, so portable JSON encoding/decoding logic can be written against LaunchDarkly.JsonStream without needing to know the target platform.

Signing

The published version of this assembly is both digitally signed by LaunchDarkly and strong-named. Building the code locally in the default Debug configuration does not sign the assembly and does not require a key file. The public key file is in this repository at LaunchDarkly.JsonStream.pk as well as here:

Public Key:
0024000004800000940000000602000000240000525341310004000001000100
9d95e00dd6f9ef0bfc51850129b6b6292b99d4c3a2ab0f35cdfd6879eed457bf
aa79a4c0f848c592727cd6bae3a795eda5533a5c54623918303ecabd1c022da6
fe90b8c3e4b61c96595c0b90ff8019872fec9b763dcc5156083a29bad49cf685
f16d1be32d1a13478d59b4c02b4773ad31dceb7828ab8c21ec5b388e1b90c3b0

Public Key Token: baa039a572ce18d0

Contributing

We encourage pull requests and other contributions from the community. Check out our contributing guidelines for instructions on how to contribute to this project.

About LaunchDarkly

• LaunchDarkly is a continuous delivery platform that provides feature flags as a service and allows developers to iterate quickly and safely. We allow you to easily flag your features and manage them from the LaunchDarkly dashboard. With LaunchDarkly, you can:
  • Roll out a new feature to a subset of your users (like a group of users who opt-in to a beta tester group), gathering feedback and bug reports from real-world use cases.
  • Gradually roll out a feature to an increasing percentage of users, and track the effect that the feature has on key metrics (for instance, how likely is a user to complete a purchase if they have feature A versus feature B?).
  • Turn off a feature that you realize is causing performance problems in production, without needing to re-deploy, or even restart the application with a changed configuration file.
  • Grant access to certain features based on user attributes, like payment plan (eg: users on the ‘gold’ plan get access to more features than users in the ‘silver’ plan). Disable parts of your application to facilitate maintenance, without taking everything offline.
• LaunchDarkly provides feature flag SDKs for a wide variety of languages and technologies. Check out our documentation for a complete list.
• Explore LaunchDarkly
  • launchdarkly.com for more information
  • docs.launchdarkly.com for our documentation and SDK reference guides
  • apidocs.launchdarkly.com for our API documentation
  • blog.launchdarkly.com for the latest product updates