chore: move memfd config to datadog-library-config (#1072)

# What does this PR do?

Move shared in-memory tracer configuration from `ddcommon` to `datadog-library-config`.

# Motivation

It's better suited than `ddcommon`.

Author: dmehala

Cargo.lock

@@ -3,7 +3,7 @@
 
 [package]
 name = "datadog-library-config-ffi"
-version = "0.0.1"
+version = "0.0.2"
 edition = "2021"
 
 [lib]

datadog-library-config-ffi/Cargo.toml

@@ -1,6 +1,8 @@
 // Copyright 2021-Present Datadog, Inc. https://www.datadoghq.com/
 // SPDX-License-Identifier: Apache-2.0
 
+pub mod tracer_metadata;
+
 use datadog_library_config::{self as lib_config, LibraryConfigSource};
 use ddcommon_ffi::{self as ffi, slice::AsBytes, CharSlice};
 

datadog-library-config-ffi/src/lib.rs

@@ -1,11 +1,10 @@
 // Copyright 2023-Present Datadog, Inc. https://www.datadoghq.com/
 // SPDX-License-Identifier: Apache-2.0
 
-use crate::slice::CharSlice;
-use crate::Result;
 #[cfg(target_os = "linux")]
-use ddcommon::tracer_metadata::AnonymousFileHandle;
-use ddcommon::tracer_metadata::{self, TracerMetadata};
+use datadog_library_config::tracer_metadata::AnonymousFileHandle;
+use datadog_library_config::tracer_metadata::{self, TracerMetadata};
+use ddcommon_ffi::{CharSlice, Result};
 use std::os::raw::c_int;
 
 /// C-compatible representation of an anonymous file handle

ddcommon-ffi/src/tracer_metadata.rs renamed to datadog-library-config-ffi/src/tracer_metadata.rs

@@ -3,7 +3,7 @@
 
 [package]
 name = "datadog-library-config"
-version = "0.0.1"
+version = "0.0.2"
 edition = "2021"
 
 [lib]
@@ -15,5 +15,12 @@ serde = { version = "1.0", features = ["derive"] }
 serde_yaml = "0.9.34"
 anyhow = "1.0"
 
+rand = "0.8.3"
+rmp = "0.8.14"
+rmp-serde = "1.3.0"
+
 [dev-dependencies]
 tempfile = { version = "3.3" }
+
+[target.'cfg(unix)'.dependencies]
+memfd = { version = "0.6" }

datadog-library-config/Cargo.toml

@@ -1,5 +1,6 @@
 // Copyright 2021-Present Datadog, Inc. https://www.datadoghq.com/
 // SPDX-License-Identifier: Apache-2.0
+pub mod tracer_metadata;
 
 use std::borrow::Cow;
 use std::cell::OnceCell;

datadog-library-config/src/lib.rs

@@ -19,7 +19,6 @@ pub mod slice_mut;
 pub mod string;
 pub mod tags;
 pub mod timespec;
-pub mod tracer_metadata;
 pub mod utils;
 pub mod vec;
 

ddcommon/src/tracer_metadata.rs renamed to datadog-library-config/src/tracer_metadata.rs

@@ -31,10 +31,7 @@ tower-service = "0.3"
 cc = "1.1.31"
 log = { version = "0.4" }
 pin-project = "1"
-rand = "0.8.3"
 regex = "1.5"
-rmp = "0.8.14"
-rmp-serde = "1.3.0"
 rustls = { version = "0.23", default-features = false, optional = true }
 rustls-native-certs = { version = "0.8.1", optional = true }
 tokio = { version = "1.23", features = ["rt", "macros"] }
@@ -55,7 +52,6 @@ hyper-rustls = { version = "0.27", default-features = false, features = [
     "tls12",
     "aws-lc-rs",
 ], optional = true }
-memfd = { version = "0.6" }
 
 [target.'cfg(not(unix))'.dependencies]
 hyper-rustls = { version = "0.27", default-features = false, features = [

ddcommon-ffi/src/lib.rs

@@ -24,7 +24,6 @@ pub mod config;
 pub mod hyper_migration;
 pub mod rate_limiter;
 pub mod tag;
-pub mod tracer_metadata;
 pub mod unix_utils;
 
 /// Extension trait for `Mutex` to provide a method that acquires a lock, panicking if the lock is