ci: add hello-nginx to ci

Author: cwaldren-ld

.github/workflows/ci.yml

@@ -61,3 +61,23 @@ jobs:
       - name: Stop hello-haproxy container
         run: |
           docker stop hello-haproxy
+
+  hello-nginx:
+    runs-on: ubuntu-latest
+    env:
+      LD_SDK_KEY: "foo"
+    steps:
+      - uses: actions/checkout@v4
+      - name: Build hello-nginx image
+        run: |
+          docker build -t launchdarkly:hello-nginx -f ./examples/hello-nginx/Dockerfile .
+      - name: Run hello-nginx container in background
+        run: |
+          docker run -dit --rm --name hello-nginx -p 8123:80 --env LD_SDK_KEY="$LD_SDK_KEY" launchdarkly:hello-nginx
+      - name: Evaluate feature flag
+        run: |
+          curl --retry 5 --retry-all-errors --retry-delay 1 -s -v http://localhost:8123 | tee response.txt
+          grep -F "Feature flag is false for this user" response.txt || (echo "Expected false evaluation!" && exit 1)
+      - name: Stop hello-nginx container
+        run: |
+          docker stop hello-nginx

examples/hello-nginx/Dockerfile

@@ -0,0 +1,44 @@
+FROM openresty/openresty:jammy
+
+# {{ x-release-please-start-version }}
+ARG VERSION=2.0.6
+# {{ x-release-please-end }}
+
+RUN apt-get update && apt-get install -y \
+    curl apt-transport-https ca-certificates \
+    software-properties-common
+
+RUN add-apt-repository ppa:mhier/libboost-latest && \
+     apt-get update && \
+     apt-get install -y boost1.81
+
+RUN curl https://github.com/launchdarkly/cpp-sdks/releases/download/launchdarkly-cpp-server-v3.3.1/linux-gcc-x64-dynamic.zip -L -o /tmp/sdk.zip && \
+    mkdir ./cpp-sdk && \
+    unzip /tmp/sdk.zip -d ./cpp-sdk && \
+    rm /tmp/sdk.zip
+
+RUN mkdir -p /usr/local/openresty/nginx/scripts
+
+COPY . .
+COPY ./examples/hello-nginx/nginx.conf /usr/local/openresty/nginx/conf/nginx.conf
+COPY ./examples/hello-nginx/shared.lua /usr/local/openresty/nginx/scripts/
+
+RUN luarocks make launchdarkly-server-sdk-"${VERSION}"-0.rockspec LD_DIR=./cpp-sdk/build-dynamic/release && \
+    cp launchdarkly_server_sdk.so /usr/local/openresty/lualib/
+
+# The strategy for this Docker example is to download the C++ SDK release artifacts and use those instead of compiling
+# from source. This is for example/CI purposes only; generally it's better to build from source to ensure all libraries
+# are compatible.
+#
+# Since we require a newer version of boost than is available in Ubuntu 22.04, we grab it from a PPA (mhier/libboost-latest).
+#
+# The SDK dynamic libs expect the boost libs to follow a specific naming convention, which isn't what
+# the libraries from the PPA follow ('-mt' suffix is added to indicate the libraries are built with multithreading support enabled.)
+#
+# It's not 100% clear if these libraries are multithread enabled (build logs in the PPA seem to indicate it),
+# but even so, the C++ SDK is single-threaded.
+#
+# To workaround, add symlinks with the expected names.
+RUN cd /usr/lib/x86_64-linux-gnu && \
+    ln -s libboost_json.so.1.81.0 libboost_json-mt-x64.so.1.81.0 && \
+    ln -s libboost_url.so.1.81.0 libboost_url-mt-x64.so.1.81.0