[FFL-1273] bindings for libdatadog datadog ffe api

[sameerank]

What does this PR do?

Motivation:

Change log entry

None because this binding is an internal feature (not user-facing). User-facing methods will be from the OpenFeature provider

Additional Notes:

Since datadog-ffe-ffi (DataDog/libdatadog#1282) hasn't been published yet, you'll need to build libdatadog locally to access the evaluation engine.

Prerequisites

• Rust toolchain with cargo and cbindgen
• Ruby development environment
• pkg-config system tool
• Datadog repositories cloned under ~/dd/ (assumes you have ~/dd/dd-trace-rb and ~/dd/libdatadog)

To build libdatadog and test binding in dd-trace-rb

Run this script.

zsh setup_ffe.sh

To clean and retry

cd ~/dd/dd-trace-rb
rm -rf tmp/ my-libdatadog-build/
rm -f lib/*.bundle
bundle exec rake clean
# Then repeat

How to test the change?

[github-actions]

Thank you for updating Change log entry section 👏

^{Visited at: 2025-10-24 15:17:34 UTC}

[github-actions]

Typing analysis

Note: Ignored files are excluded from the next sections.

Untyped methods

This PR introduces 1 untyped method. It increases the percentage of typed methods from 51.13% to 51.29% (+0.16%).

Untyped methods (+1-0)

❌ Introduced:

sig/datadog/core/feature_flags.rbs:38
└── def initialize: () -> void

If you believe a method or an attribute is rightfully untyped or partially typed, you can add # untyped:accept to the end of the line to remove it from the stats.

[datadog-official]

⚠️ Tests

⚠️ Warnings

🧪 10 Tests failed

Datadog::Core::FeatureFlags.supported? when feature flags are supported returns true from rspec (Datadog)

expected true
     got false

Failure/Error: expect(described_class.supported?).to be true

  expected true
       got false
./spec/datadog/core/feature_flags_spec.rb:48:in 'block (4 levels) in <top (required)>'
./spec/spec_helper.rb:272:in 'block (2 levels) in <top (required)>'
./spec/spec_helper.rb:154:in 'block (2 levels) in <top (required)>'
...

Datadog::Core::FeatureFlags when Feature Flags are supported Datadog::Core::FeatureFlags::EvaluationContext.new_with_attribute creates an evaluation context with attribute from rspec (Datadog)

expected no Exception, got #<ArgumentError: Feature Flags are not supported: cannot load such file -- libdatadog_api.3.4_x86_64-linux> with backtrace:
  # ./lib/datadog/core/feature_flags.rb:37:in 'Datadog::Core::FeatureFlags::EvaluationContext.new_with_attribute'
  # ./spec/datadog/core/feature_flags_spec.rb:138:in 'block (5 levels) in <top (required)>'
  # ./spec/datadog/core/feature_flags_spec.rb:142:in 'block (6 levels) in <top (required)>'
  # ./spec/datadog/core/feature_flags_spec.rb:142:in 'block (5 levels) in <top (required)>'
  # ./spec/spec_helper.rb:272:in 'block (2 levels) in <top (required)>'
  # ./spec/spec_helper.rb:154:in 'block (2 levels) in <top (required)>'
  # /usr/local/bundle/gems/webmock-3.26.0/lib/webmock/rspec.rb:39:in 'block (2 levels) in <top (required)>'
  # /usr/local/bundle/gems/rspec-wait-0.0.10/lib/rspec/wait.rb:47:in 'block (2 levels) in <top (required)>'
  # ./spec/support/execute_in_fork.rb:32:in 'ForkableExample#run'
...

Datadog::Core::FeatureFlags when Feature Flags are supported .get_assignment with existing flag returns an Assignment object from rspec (Datadog)

Feature Flags are not supported: cannot load such file -- libdatadog_api.3.4_x86_64-linux

Failure/Error: raise(ArgumentError, "Feature Flags are not supported: #{Datadog::Core::LIBDATADOG_API_FAILURE}")

ArgumentError:
  Feature Flags are not supported: cannot load such file -- libdatadog_api.3.4_x86_64-linux
./lib/datadog/core/feature_flags.rb:18:in 'Datadog::Core::FeatureFlags::Configuration#initialize'
./spec/datadog/core/feature_flags_spec.rb:106:in 'Class#new'
./spec/datadog/core/feature_flags_spec.rb:106:in 'block (3 levels) in <top (required)>'
./spec/datadog/core/feature_flags_spec.rb:148:in 'block (4 levels) in <top (required)>'
...

View all

ℹ️ Info

❄️ No new flaky tests detected

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[sameerank]

Closing this PR in favor of #5007