[FFL-1284] Create datadog-ffe-ffi crate

.github/CODEOWNERS

@@ -22,6 +22,7 @@ data-pipeline*/             @Datadog/libdatadog-apm
 datadog-tracer-flare        @Datadog/libdatadog-apm
 ddsketch                    @Datadog/libdatadog-apm @Datadog/libdatadog-telemetry
 datadog-ffe                 @Datadog/feature-flagging-and-experimentation-sdk
+datadog-ffe-ffi             @Datadog/feature-flagging-and-experimentation-sdk
 
 # Most of the bin_tests are owned by the profiling team, but some are owned by the core team
 bin_tests/                  @Datadog/libdatadog-profiling

Cargo.toml

@@ -8,6 +8,7 @@ members = [
   "datadog-crashtracker",
   "datadog-crashtracker-ffi",
   "datadog-ffe",
+  "datadog-ffe-ffi",
   "datadog-ipc",
   "datadog-ipc-macros",
   "libdd-library-config",

LICENSE-3rdparty.yml

@@ -1,4 +1,4 @@
-root_name: builder, build_common, tools, libdd-alloc, datadog-crashtracker, ddcommon, libdd-telemetry, libdd-ddsketch, datadog-crashtracker-ffi, ddcommon-ffi, datadog-ffe, datadog-ipc, datadog-ipc-macros, libdd-tinybytes, tarpc, tarpc-plugins, spawn_worker, cc_utils, libdd-library-config, libdd-library-config-ffi, datadog-live-debugger, datadog-live-debugger-ffi, datadog-profiling, libdd-profiling-protobuf, datadog-profiling-ffi, data-pipeline-ffi, data-pipeline, datadog-trace-stats, datadog-trace-utils, libdd-trace-normalization, libdd-trace-protobuf, libdd-dogstatsd-client, libdd-log, libdd-ddsketch-ffi, libdd-log-ffi, libdd-telemetry-ffi, symbolizer-ffi, datadog-profiling-replayer, datadog-remote-config, datadog-sidecar, datadog-sidecar-macros, datadog-sidecar-ffi, datadog-trace-obfuscation, datadog-tracer-flare, sidecar_mockgen, test_spawn_from_lib
+root_name: builder, build_common, tools, libdd-alloc, datadog-crashtracker, ddcommon, libdd-telemetry, libdd-ddsketch, datadog-crashtracker-ffi, ddcommon-ffi, datadog-ffe, datadog-ffe-ffi, datadog-ipc, datadog-ipc-macros, libdd-tinybytes, tarpc, tarpc-plugins, spawn_worker, cc_utils, libdd-library-config, libdd-library-config-ffi, datadog-live-debugger, datadog-live-debugger-ffi, datadog-profiling, libdd-profiling-protobuf, datadog-profiling-ffi, data-pipeline-ffi, data-pipeline, datadog-trace-stats, datadog-trace-utils, libdd-trace-normalization, libdd-trace-protobuf, libdd-dogstatsd-client, libdd-log, libdd-ddsketch-ffi, libdd-log-ffi, libdd-telemetry-ffi, symbolizer-ffi, datadog-profiling-replayer, datadog-remote-config, datadog-sidecar, datadog-sidecar-macros, datadog-sidecar-ffi, datadog-trace-obfuscation, datadog-tracer-flare, sidecar_mockgen, test_spawn_from_lib
 third_party_libraries:
 - package_name: addr2line
   package_version: 0.24.2
@@ -27693,9 +27693,9 @@ third_party_libraries:
 - package_name: stringmetrics
   package_version: 2.2.2
   repository: https://github.com/pluots/stringmetrics
-  license: License specified in file ($CARGO_HOME/registry/src/github.com-25cdd57fae9f0462/stringmetrics-2.2.2/LICENSE)
+  license: License specified in file ($CARGO_HOME/registry/src/index.crates.io-1949cf8c6b5b557f/stringmetrics-2.2.2/LICENSE)
   licenses:
-  - license: License specified in file ($CARGO_HOME/registry/src/github.com-25cdd57fae9f0462/stringmetrics-2.2.2/LICENSE)
+  - license: License specified in file ($CARGO_HOME/registry/src/index.crates.io-1949cf8c6b5b557f/stringmetrics-2.2.2/LICENSE)
     text: |
       Copyright 2022 Trevor Gross
 

datadog-ffe-ffi/Cargo.toml

@@ -0,0 +1,28 @@
+# Copyright 2025-Present Datadog, Inc. https://www.datadoghq.com/
+# SPDX-License-Identifier: Apache-2.0
+
+[package]
+name = "datadog-ffe-ffi"
+edition.workspace = true
+version = "0.1.0"
+rust-version.workspace = true
+license.workspace = true
+
+[lib]
+crate-type = ["lib", "staticlib", "cdylib"]
+bench = false
+
+[features]
+default = ["cbindgen"]
+cbindgen = ["build_common/cbindgen", "ddcommon-ffi/cbindgen"]
+
+[build-dependencies]
+build_common = { path = "../build-common" }
+
+[dependencies]
+anyhow = "1.0.93"
+datadog-ffe = { path = "../datadog-ffe", version = "=0.1.0" }
+ddcommon-ffi = { path = "../ddcommon-ffi", default-features = false }
+function_name = "0.3.0"
+
+[dev-dependencies]

datadog-ffe-ffi/build.rs

@@ -0,0 +1,11 @@
+// Copyright 2025-Present Datadog, Inc. https://www.datadoghq.com/
+// SPDX-License-Identifier: Apache-2.0
+extern crate build_common;
+
+use build_common::generate_and_configure_header;
+
+fn main() {
+    println!("cargo:rerun-if-changed=src/*");
+    let header_name = "datadog_ffe.h";
+    generate_and_configure_header(header_name);
+}

datadog-ffe-ffi/cbindgen.toml

@@ -0,0 +1,41 @@
+# Copyright 2025-Present Datadog, Inc. https://www.datadoghq.com/
+# SPDX-License-Identifier: Apache-2.0
+
+language = "C"
+cpp_compat = true
+tab_width = 2
+header = """// Copyright 2025-Present Datadog, Inc. https://www.datadoghq.com/
+// SPDX-License-Identifier: Apache-2.0
+"""
+include_guard = "DDOG_FFE_H"
+style = "tag"
+usize_is_size_t = true
+pragma_once = true
+
+no_includes = true
+sys_includes = ["stdbool.h", "stddef.h", "stdint.h"]
+includes = ["common.h"]
+
+[export]
+include = ["datadog-ffe-ffi"]
+prefix = "ddog_ffe_"
+renaming_overrides_prefixing = true
+
+[export.rename]
+"VoidResult" = "ddog_VoidResult"
+"Error" = "ddog_Error"
+"Vec_u8" = "ddog_Vec_U8"
+
+[export.mangle]
+rename_types = "PascalCase"
+
+[enum]
+prefix_with_name = true
+rename_variants = "ScreamingSnakeCase"
+
+[fn]
+must_use = "DDOG_CHECK_RETURN"
+
+[parse]
+parse_deps = true
+include = ["ddcommon-ffi", "datadog-ffe"]