Go Server SDK

The FlagTGL Go Server SDK is designed for backend services running in Go. It connects to the FlagTGL relay proxy or API to evaluate feature flags server-side.

Installation

go get github.com/flagtgl/go-server-sdk

Quick Start

client := flagtgl.NewClient("your-sdk-key")
defer client.Close()

user := flagtgl.NewUser("user-123").WithAttribute("plan", "pro")
enabled := client.BoolVariation("my-flag", user, false)

The SDK is compatible with the LaunchDarkly Go SDK interface, making migration straightforward. See the Migration Guide for details.

Safe behavior when FlagTGL is unavailable

Every evaluation includes a fallback value. If FlagTGL is unreachable and no last-known-good configuration is available, the SDK serves that code-defined fallback. Passing false means Disabled for all contexts:

enabled := client.BoolVariation("new-rbac", user, false)

Keep fallbacks conservative, explicit, and covered by application tests.

note

Full SDK reference documentation is coming soon.