Refactor cart service to use Swift

.dockerignore

@@ -22,3 +22,7 @@ src/*/*/Dockerfile
 ./src/shipping/target
 ###################################
 
+###################################
+# cart
+./src/cart/.build/
+###################################

.env

@@ -56,7 +56,7 @@ AD_DOCKERFILE=./src/ad/Dockerfile
 # Cart Service
 CART_PORT=7070
 CART_ADDR=cart:${CART_PORT}
-CART_DOCKERFILE=./src/cart/src/Dockerfile
+CART_DOCKERFILE=./src/cart/Dockerfile
 
 # Checkout Service
 CHECKOUT_PORT=5050
@@ -147,8 +147,9 @@ KAFKA_ADDR=${KAFKA_HOST}:${KAFKA_PORT}
 KAFKA_DOCKERFILE=./src/kafka/Dockerfile
 
 # Valkey
+VALKEY_HOST=valkey-cart
 VALKEY_PORT=6379
-VALKEY_ADDR=valkey-cart:${VALKEY_PORT}
+VALKEY_ADDR=${VALKEY_HOST}:${VALKEY_PORT}
 
 # ********************
 # Telemetry Components

.gitignore

@@ -23,6 +23,7 @@ obj/
 .gradle/
 .idea/
 build/
+.build/
 node_modules/
 coverage
 .next/
@@ -42,7 +43,6 @@ test/tracetesting/tracetesting-vars.yaml
 
 # Ignore copied/generated protobuf files
 /src/accounting/src/protos/
-/src/cart/src/protos/
 /src/fraud-detection/src/main/proto
 /src/payment/demo.proto
 /src/shipping/proto/

docker-compose.minimal.yml

@@ -74,7 +74,6 @@ services:
       - OTEL_EXPORTER_OTLP_ENDPOINT
       - OTEL_RESOURCE_ATTRIBUTES
       - OTEL_SERVICE_NAME=cart
-      - ASPNETCORE_URLS=http://*:${CART_PORT}
     depends_on:
       valkey-cart:
         condition: service_started

docker-compose.yml

@@ -101,12 +101,13 @@ services:
     environment:
       - CART_PORT
       - FLAGD_HOST
-      - FLAGD_PORT
-      - VALKEY_ADDR
-      - OTEL_EXPORTER_OTLP_ENDPOINT
+      - FLAGD_OFREP_PORT
+      - VALKEY_HOST
+      - VALKEY_PORT
+      - OTEL_EXPORTER_OTLP_ENDPOINT=http://${OTEL_COLLECTOR_HOST}:${OTEL_COLLECTOR_PORT_HTTP}
       - OTEL_RESOURCE_ATTRIBUTES
       - OTEL_SERVICE_NAME=cart
-      - ASPNETCORE_URLS=http://*:${CART_PORT}
+      - OTEL_LOG_LEVEL=debug
     depends_on:
       valkey-cart:
         condition: service_started

docker-gen-proto.sh

@@ -43,10 +43,24 @@ gen_proto_ts() {
     /build/pb/demo.proto'
 }
 
+gen_proto_swift() {
+  echo "Generating Swift protobuf files for $1"
+  docker build -f "src/$1/genproto/Dockerfile" -t "$1-genproto" .
+  docker run --rm -e SERVICE=$1 -v $(pwd):/build "$1-genproto" /bin/sh -c '
+    mkdir -p /build/src/$SERVICE/Sources/CTL/Generated && \
+    protoc -I /build/pb \
+    --plugin="$(swift build --show-bin-path)/protoc-gen-swift" \
+    --plugin="$(swift build --show-bin-path)/protoc-gen-grpc-swift-2" \
+    --swift_out="/build/src/$SERVICE/Sources/CTL/Generated" \
+    --grpc-swift-2_opt=Client=false \
+    --grpc-swift-2_out="/build/src/$SERVICE/Sources/CTL/Generated" \
+    /build/pb/demo.proto'
+}
+
 if [ -z "$1" ]; then
   #gen_proto_dotnet accounting
   #gen_proto_java ad
-  #gen_proto_dotnet cart
+  gen_proto_swift cart
   gen_proto_go checkout
   gen_proto_cpp currency
   #gen_proto_ruby email

src/cart/.dockerignore

@@ -0,0 +1,3 @@
+**/.build/
+**/.swiftpm/
+Dockerfile*

src/cart/.gitignore

@@ -0,0 +1 @@
+.swiftpm/

src/cart/Dockerfile

@@ -0,0 +1,75 @@
+# ================================
+# Build image
+# ================================
+FROM swift:6.1-noble AS build
+
+# Install OS updates
+RUN export DEBIAN_FRONTEND=noninteractive DEBCONF_NONINTERACTIVE_SEEN=true \
+    && apt-get -q update \
+    && apt-get -q dist-upgrade -y \
+    && apt-get install -y libjemalloc-dev \
+    && rm -rf /var/lib/apt/lists/*
+
+# Set up a build area
+WORKDIR /build
+
+# First just resolve dependencies.
+# This creates a cached layer that can be reused
+# as long as your Package.swift/Package.resolved
+# files do not change.
+COPY ./src/cart/Package.* ./
+RUN swift package resolve
+
+# Copy entire repo into container
+COPY ./src/cart .
+
+# Build the application, with optimizations, with static linking, and using jemalloc
+RUN swift build -c release \
+    --product "cart" \
+    --static-swift-stdlib \
+    -Xlinker -ljemalloc
+
+# Switch to the staging area
+WORKDIR /staging
+
+# Copy main executable to staging area
+RUN cp "$(swift build --package-path /build -c release --show-bin-path)/cart" ./
+
+# Copy static swift backtracer binary to staging area
+RUN cp "/usr/libexec/swift/linux/swift-backtrace-static" ./
+
+# ================================
+# Run image
+# ================================
+FROM ubuntu:noble
+
+# Make sure all system packages are up to date, and install only essential packages.
+RUN export DEBIAN_FRONTEND=noninteractive DEBCONF_NONINTERACTIVE_SEEN=true \
+    && apt-get -q update \
+    && apt-get -q dist-upgrade -y \
+    && apt-get -q install -y \
+      libjemalloc2 \
+      ca-certificates \
+      tzdata \
+    && rm -r /var/lib/apt/lists/*
+
+# Create a cart user and group with /app as its home directory
+RUN useradd --user-group --create-home --system --skel /dev/null --home-dir /app cart
+
+# Switch to the new home directory
+WORKDIR /app
+
+# Copy built executable and any staged resources from builder
+COPY --from=build --chown=cart:cart /staging /app
+
+# Provide configuration needed by the built-in crash reporter and some sensible default behaviors.
+ENV SWIFT_BACKTRACE=enable=yes,sanitize=yes,threads=all,images=all,interactive=no,swift-backtrace=./swift-backtrace-static
+
+# Ensure all further commands run as the cart user
+USER cart:cart
+
+# Let Docker bind to the cart port
+EXPOSE ${CART_PORT}
+
+# Start the cart service when the image is run
+ENTRYPOINT ["./cart"]