Currency Service using C++ (open-telemetry#189)

* Saving incremental changes

* Saved the draft

* Added convert function

* Added some more changes

* Updated more changes

* More changes

* Removed js code

* Final changes

* Currency Service in C++

* Cleaned up license

* Removed trailing space

* Incorporated review comments

* Updated sanity failure

* Resolved md error

* Resolved md error

Co-authored-by: Austin Parker <austin@ap2.io>
Co-authored-by: Carter Socha <43380952+cartersocha@users.noreply.github.com>

CHANGELOG.md

@@ -19,3 +19,5 @@ release.
   ([#82](https://github.com/open-telemetry/opentelemetry-demo-webstore/pull/82))
 * Added feature flag service implementation
   ([#141](https://github.com/open-telemetry/opentelemetry-demo-webstore/pull/141))
+* Re-implemented currency service using C++
+  ([#189](https://github.com/open-telemetry/opentelemetry-demo-webstore/pull/189))

docker-compose.yml

@@ -102,6 +102,9 @@ services:
     image: ${IMAGE_NAME}:${IMAGE_VERSION}-currencyservice
     build:
       context: ./src/currencyservice
+      args:
+        - GRPC_VERSION=1.46.0
+        - OPENTELEMETRY_VERSION=1.4.0
     ports:
       - "${CURRENCY_SERVICE_PORT}"
     environment:

src/currencyservice/CMakeLists.txt

@@ -0,0 +1,73 @@
+cmake_minimum_required(VERSION 3.1)
+project(currency-service)
+
+find_package(Protobuf)
+find_package(gRPC)
+
+set(PROTO_PATH "${CMAKE_CURRENT_SOURCE_DIR}/proto")
+set(GENERATED_PROTOBUF_PATH "${CMAKE_BINARY_DIR}/generated/proto")
+set(GENERATED_HEALTH_PROTOBUF_PATH "${GENERATED_PROTOBUF_PATH}/grpc/health/v1")
+
+file(MAKE_DIRECTORY "${GENERATED_PROTOBUF_PATH}")
+
+set(DEMO_PROTO "${PROTO_PATH}/demo.proto")
+set(DEMO_PB_CPP_FILE "${GENERATED_PROTOBUF_PATH}/demo.pb.cc")
+set(DEMO_PB_H_FILE "${GENERATED_PROTOBUF_PATH}/demo.pb.h")
+set(DEMO_GRPC_PB_CPP_FILE "${GENERATED_PROTOBUF_PATH}/demo.grpc.pb.cc")
+set(DEMO_GRPC_PB_H_FILE "${GENERATED_PROTOBUF_PATH}/demo.grpc.pb.h")
+set(HEALTH_PROTO "${PROTO_PATH}/grpc/health/v1/health.proto")
+set(HEALTH_PB_CPP_FILE "${GENERATED_HEALTH_PROTOBUF_PATH}/health.pb.cc")
+set(HEALTH_PB_H_FILE "${GENERATED_HEALTH_PROTOBUF_PATH}/health.pb.h")
+set(HEALTH_GRPC_PB_CPP_FILE "${GENERATED_HEALTH_PROTOBUF_PATH}/health.grpc.pb.cc")
+set(HEALTH_GRPC_PB_H_FILE "${GENERATED_HEALTH_PROTOBUF_PATH}/health.grpc.pb.h")
+
+foreach(IMPORT_DIR ${PROTOBUF_IMPORT_DIRS})
+  list(APPEND PROTOBUF_INCLUDE_FLAGS "-I${IMPORT_DIR}")
+endforeach()
+
+find_program(gRPC_CPP_PLUGIN_EXECUTABLE grpc_cpp_plugin)
+
+add_custom_command(
+    OUTPUT ${DEMO_PB_H_FILE}
+           ${DEMO_PB_CPP_FILE}
+           ${DEMO_GRPC_PB_CPP_FILE}
+           ${DEMO_GRPC_PB_H_FILE}
+           ${HEALTH_PB_H_FILE}
+           ${HEALTH_PB_CPP_FILE}
+           ${HEALTH_GRPC_PB_CPP_FILE}
+           ${HEALTH_GRPC_PB_H_FILE}
+
+    COMMAND
+      ${PROTOBUF_PROTOC_EXECUTABLE} ARGS "--experimental_allow_proto3_optional"
+      "--proto_path=${PROTO_PATH}" ${PROTOBUF_INCLUDE_FLAGS}
+      "--cpp_out=${GENERATED_PROTOBUF_PATH}"
+      "--grpc_out=generate_mock_code=true:${GENERATED_PROTOBUF_PATH}"
+      --plugin=protoc-gen-grpc="${gRPC_CPP_PLUGIN_EXECUTABLE}" ${DEMO_PROTO} ${HEALTH_PROTO})
+
+message(STATUS "gRPC_CPP_PLUGIN_EXECUTABLE=${gRPC_CPP_PLUGIN_EXECUTABLE}")
+
+add_library(demo-proto ${DEMO_PB_H_FILE}
+           ${DEMO_PB_CPP_FILE}
+           ${DEMO_GRPC_PB_CPP_FILE}
+           ${DEMO_GRPC_PB_H_FILE}
+           ${HEALTH_PB_H_FILE}
+           ${HEALTH_PB_CPP_FILE}
+           ${HEALTH_GRPC_PB_CPP_FILE}
+           ${HEALTH_GRPC_PB_H_FILE})
+
+target_link_libraries(demo-proto gRPC::grpc++ protobuf::libprotobuf)
+include_directories("${GENERATED_PROTOBUF_PATH}")
+
+add_executable(currencyservice src/server.cpp)
+add_dependencies(currencyservice demo-proto)
+target_link_libraries(
+    currencyservice demo-proto protobuf::libprotobuf
+    opentelemetry_resources opentelemetry_trace opentelemetry_common  opentelemetry_exporter_otlp_grpc opentelemetry_proto opentelemetry_otlp_recordable gRPC::grpc++)
+
+add_executable(currencyclient src/client.cpp)
+add_dependencies(currencyclient demo-proto)
+target_link_libraries(
+    currencyclient demo-proto protobuf::libprotobuf gRPC::grpc++)
+
+install(TARGETS currencyservice DESTINATION bin)
+install(TARGETS currencyclient DESTINATION bin)

src/currencyservice/Dockerfile

@@ -1,46 +1,57 @@
-# Copyright 2020 Google LLC
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#      http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-FROM node:16-alpine as base
-
-FROM base as builder
-
-# Some packages (e.g. @google-cloud/profiler) require additional
-# deps for post-install scripts
-RUN apk add --update --no-cache \
-    python3 \
-    make \
-    g++
-
-WORKDIR /usr/src/app
-
-COPY package*.json ./
-
-RUN npm install --only=production
-
-FROM base
-
-RUN GRPC_HEALTH_PROBE_VERSION=v0.4.7 && \
-    wget -qO/bin/grpc_health_probe https://github.com/grpc-ecosystem/grpc-health-probe/releases/download/${GRPC_HEALTH_PROBE_VERSION}/grpc_health_probe-linux-amd64 && \
-    chmod +x /bin/grpc_health_probe
-
-WORKDIR /usr/src/app
-
-COPY --from=builder /usr/src/app/node_modules ./node_modules
-
-COPY . .
-
-EXPOSE 7000
-
-ENTRYPOINT [ "node", "--require", "./tracing.js", "server.js" ]
+FROM ubuntu:20.04
+ENV DEBIAN_FRONTEND noninteractive
+
+RUN apt-get -y update
+RUN apt-get -y upgrade && apt-get -y dist-upgrade
+RUN apt-get install -qq -y --ignore-missing \
+  build-essential                           \
+  git                                       \
+  make                                      \
+  pkg-config                                \
+  protobuf-compiler                         \
+  libprotobuf-dev                           \
+  cmake
+
+# The following arguments would be passed from docker-compose.yml
+ARG GRPC_VERSION
+ARG OPENTELEMETRY_VERSION
+
+# Install GRPC
+RUN git clone --shallow-submodules --depth 1 --recurse-submodules -b v${GRPC_VERSION} \
+  https://github.com/grpc/grpc \
+  && cd grpc \
+  && mkdir -p cmake/build \
+  && cd cmake/build \
+  && cmake \
+    -DgRPC_INSTALL=ON \
+    -DgRPC_BUILD_TESTS=OFF \
+    -DCMAKE_BUILD_TYPE=Release \
+    -DgRPC_BUILD_GRPC_NODE_PLUGIN=OFF \
+    -DgRPC_BUILD_GRPC_OBJECTIVE_C_PLUGIN=OFF \
+    -DgRPC_BUILD_GRPC_PHP_PLUGIN=OFF \
+    -DgRPC_BUILD_GRPC_PHP_PLUGIN=OFF \
+    -DgRPC_BUILD_GRPC_PYTHON_PLUGIN=OFF \
+    -DgRPC_BUILD_GRPC_RUBY_PLUGIN=OFF \
+    ../.. \
+  && make -j2 \
+  && make install \
+  && cd ../../.. \
+  && rm -rf grpc
+
+# install opentelemetry
+RUN git clone https://github.com/open-telemetry/opentelemetry-cpp \
+    && cd opentelemetry-cpp/ \
+    && git checkout tags/v${OPENTELEMETRY_VERSION} -b v${OPENTELEMETRY_VERSION} \
+    && git submodule update --init --recursive \
+    && mkdir build \
+    && cd build \
+    && cmake .. -DCMAKE_POSITION_INDEPENDENT_CODE=ON -DCMAKE_BUILD_TYPE=Release -DBUILD_TESTING=OFF -DWITH_OTLP=ON \
+    && make -j install && cd ../.. && rm -rf opentelemetry-cpp
+
+COPY . /currencyservice
+
+RUN cd /currencyservice \
+    && mkdir -p build && cd build \
+    && cmake .. && make -j install
+
+ENTRYPOINT currencyservice ${PORT} ${OTEL_EXPORTER_OTLP_TRACES_ENDPOINT} ${OTEL_RESOURCE_ATTRIBUTES}

src/currencyservice/README.md

@@ -1,3 +1,32 @@
-# Read Me
+# Currency Service
 
-This is a placeholder
+The Currency Service does the conversion from one currency to another.
+It is a C++ based service.
+
+## Building docker image
+
+To build the currency service, run the following from root directory
+of opentelemetry-demo-webstore
+
+```sh
+docker-compose build currencyservice
+```
+
+## Run the service
+
+Execute the below command to run the service.
+
+```sh
+docker-compose up currencyservice
+```
+
+## Run the client
+
+currencyclient is a sample client which sends some request to currency
+service. To run the client, execute the below command.
+
+```sh
+docker exec -it <container_name> currencyclient 7000
+```
+
+'7000' is port where currencyservice listens to.