Generate flagd evaluation gRPC client

.editorconfig

@@ -9,3 +9,6 @@ trim_trailing_whitespace = true
 
 [*.{sh,swift-format,yaml}]
 indent_size = 2
+
+[Makefile]
+indent_style = tab

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "flagd-schemas"]
+	path = flagd-schemas
+	url = https://github.com/open-feature/flagd-schemas

.licenseignore

@@ -7,3 +7,7 @@
 *.txt
 *.yaml
 Package.swift
+Makefile
+.gitmodules
+flagd-schemas/
+*/Generated/**

Makefile

@@ -0,0 +1,42 @@
+# Code generation
+# -----------------------------------------------------------------------------
+PROTO_ROOT = flagd-schemas/protobuf
+PROTOS += $(PROTO_ROOT)/flagd/evaluation/v1/evaluation.proto
+GEN_SWIFT_ROOT = Sources/Flagd/Generated
+GEN_SWIFTS = $(patsubst  $(PROTO_ROOT)/%.proto,$(GEN_SWIFT_ROOT)/%.pb.swift,$(PROTOS))
+GEN_GRPC_SWIFTS = $(subst $(PROTO_ROOT),$(GEN_SWIFT_ROOT),$(PROTOS:.proto=.grpc.swift))
+PROTOC_GEN_SWIFT = .build/debug/protoc-gen-swift
+PROTOC_GEN_GRPC_SWIFT = .build/debug/protoc-gen-grpc-swift
+
+$(PROTOC_GEN_SWIFT):
+	swift build --product protoc-gen-swift
+
+$(PROTOC_GEN_GRPC_SWIFT):
+	swift build --product protoc-gen-grpc-swift
+
+$(GEN_SWIFTS): $(PROTOS) $(PROTOC_GEN_SWIFT)
+	@mkdir -pv $(GEN_SWIFT_ROOT)
+	protoc $(PROTOS) \
+		--proto_path=$(PROTO_ROOT) \
+		--plugin=$(PROTOC_GEN_SWIFT) \
+		--swift_out=$(GEN_SWIFT_ROOT) \
+		--swift_opt=Visibility=Internal \
+		--experimental_allow_proto3_optional
+
+$(GEN_GRPC_SWIFTS): $(PROTOS) $(PROTOC_GEN_GRPC_SWIFT)
+	@mkdir -pv $(GEN_SWIFT_ROOT)
+	protoc $(PROTOS) \
+		--proto_path=$(PROTO_ROOT) \
+		--plugin=$(PROTOC_GEN_GRPC_SWIFT) \
+		--plugin=$(PROTOC_GEN_SWIFT) \
+		--swift_out=$(GEN_SWIFT_ROOT) \
+		--swift_opt=Visibility=Internal \
+		--grpc-swift_out=Client=true,Server=false:$(GEN_SWIFT_ROOT)
+
+.PHONY: generate
+generate: $(GEN_SWIFTS) $(GEN_GRPC_SWIFTS)
+
+.PHONY: delete-generated-code
+delete-generated-code:  # Delete all pb.swift and .grpc.swift files.
+	@read -p "Delete all *.pb.swift and *.grpc.swift files in Sources/Flagd [y/N]" ans && [ $${ans:-N} = y ]
+	find Sources -name *.pb.swift -delete -o -name *.grpc.swift -delete

Package.swift

@@ -13,13 +13,15 @@ let package = Package(
         .library(name: "Flagd", targets: ["Flagd"])
     ],
     dependencies: [
-        .package(url: "https://github.com/swift-open-feature/swift-open-feature.git", branch: "main")
+        .package(url: "https://github.com/swift-open-feature/swift-open-feature.git", branch: "main"),
+        .package(url: "https://github.com/grpc/grpc-swift.git", from: "1.8.0"),
     ],
     targets: [
         .target(
             name: "Flagd",
             dependencies: [
-                .product(name: "OpenFeature", package: "swift-open-feature")
+                .product(name: "OpenFeature", package: "swift-open-feature"),
+                .product(name: "GRPC", package: "grpc-swift"),
             ]
         ),
         .testTarget(