feat!: enable non-blocking DNS for reqwest

cmake/DatadogConfig.cmake.in

@@ -70,7 +70,8 @@ if(Datadog_FOUND)
                 Secur32
                 Ncrypt
                 PowrProf
-                Version)
+                Version
+                iphlpapi)
   endif()
 
   add_library(Datadog::Profiling ALIAS ${DD_LIB_NAME})

datadog-remote-config/examples/remote_config_fetch.rs

@@ -44,6 +44,7 @@ async fn main() {
                     api_key: None,
                     timeout_ms: 5000, // custom timeout, defaults to 3 seconds
                     test_token: None,
+                    ..Default::default()
                 },
             },
             products: vec![ApmTracing],

examples/cxx/build-and-run.ps1

@@ -146,9 +146,16 @@ if ($USE_MSVC) {
         $CXX_BRIDGE_LIB,
         # Note: when linking Rust staticlibs from C++, native system libraries that Rust
         # would normally link automatically for Rust binaries must be provided here.
-        #
-        # `rustls-platform-verifier` uses the Windows certificate APIs (Cert*), which live in Crypt32.
-        "ws2_32.lib", "advapi32.lib", "userenv.lib", "ntdll.lib", "bcrypt.lib", "ole32.lib", "crypt32.lib"
+        "advapi32.lib",
+        "bcrypt.lib",
+        # `rustls-platform-verifier` uses the Windows certificate APIs (Cert*), which live in Crypt32
+        "crypt32.lib",
+        # `hickory-resolver` uses GetAdaptersAddresses, which lives in iphlpapi.
+        "iphlpapi.lib",
+        "ntdll.lib",
+        "ole32.lib",
+        "userenv.lib",
+        "ws2_32.lib"
     )
 
     # Add extra MSVC libraries if specified

examples/cxx/exporter_manager.cpp

@@ -81,7 +81,8 @@ int main(int argc, char *argv[]) {
                 },
                 "datadoghq.com",
                 api_key,
-                10000
+                10000,
+                false
               )
             : ProfileExporter::create_file_exporter(
                 "libdatadog-example",

examples/cxx/profiling.cpp

@@ -196,7 +196,7 @@ int main() {
                             Tag{.key = "env", .value = "dev"},
                             Tag{.key = "example", .value = "cxx"}
                         },
-                        dd_site.c_str(), api_key, 10000
+                        dd_site.c_str(), api_key, 10000, false
                     )
                 );
             } else if (agent_url) {
@@ -210,7 +210,7 @@ int main() {
                             Tag{.key = "env", .value = "dev"},
                             Tag{.key = "example", .value = "cxx"}
                         },
-                        agent_url, 10000
+                        agent_url, 10000, false
                     )
                 );
             } else {

examples/ffi/exporter.cpp

@@ -97,9 +97,9 @@ int main(int argc, char *argv[]) {
 
   auto *encoded_profile = &serialize_result.ok;
 
-  // Set a custom timeout of 10000ms (10 seconds) instead of the default 3000ms
-  auto endpoint =
-      ddog_prof_Endpoint_agentless(DDOG_CHARSLICE_C_BARE("datad0g.com"), to_slice_c_char(api_key), 10000);
+  // Set a custom timeout of 10000ms (10 seconds); use_system_resolver = false (hickory DNS)
+  auto endpoint = ddog_prof_Endpoint_agentless(
+      DDOG_CHARSLICE_C_BARE("datad0g.com"), to_slice_c_char(api_key), 10000, false);
 
   ddog_Vec_Tag tags = ddog_Vec_Tag_new();
   ddog_Vec_Tag_PushResult tag_result =

libdd-common-ffi/src/endpoint.rs

@@ -75,6 +75,16 @@ extern "C" fn ddog_endpoint_set_test_token(endpoint: &mut Endpoint, token: crate
     };
 }
 
+/// Set whether to use the system DNS resolver instead of hickory-dns when building the reqwest
+/// client.
+#[no_mangle]
+pub extern "C" fn ddog_endpoint_set_use_system_resolver(
+    endpoint: &mut Endpoint,
+    use_system_resolver: bool,
+) {
+    endpoint.use_system_resolver = use_system_resolver;
+}
+
 #[no_mangle]
 pub extern "C" fn ddog_endpoint_drop(_: Box<Endpoint>) {}