Docker improvements and arm64 image building.

Dockerfile_amd64

@@ -0,0 +1,64 @@
+# ==================================================================================================
+# === Build duckling library =======================================================================
+
+FROM docker.io/haskell:8 AS builder
+
+RUN apt-get update -qq \
+  && apt-get install -qq -y --fix-missing --no-install-recommends \
+     libpcre3 libpcre3-dev build-essential pkg-config \
+  && apt-get clean \
+  && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+
+RUN mkdir /log/
+WORKDIR /duckling/
+
+ADD . .
+
+ENV LANG=C.UTF-8
+RUN stack setup
+
+# NOTE:`stack build` will use as many cores as are available to build
+# in parallel. However, this can cause OOM issues as the linking step
+# in GHC can be expensive. If the build fails, try specifying the
+# '-j1' flag to force the build to run sequentially.
+RUN stack install --test --no-run-tests
+
+# Run tests. If tests are not built in above step, the main library would be rebuilt here as well.
+RUN stack test --system-ghc
+
+# ==================================================================================================
+# === Copy prebuilt files to new image to greatly reduce the image size ============================
+
+FROM docker.io/debian:buster AS base
+
+ENV LANG C.UTF-8
+
+RUN apt-get update -qq \
+  && apt-get install -qq -y --no-install-recommends \
+     libpcre3 libgmp10 \
+  && apt-get clean \
+  && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+
+COPY --from=builder /root/.local/bin/duckling-example-exe /usr/local/bin/
+
+# Additional dependencies are required for the following test
+RUN apt-get update -qq \
+  && apt-get install -y --no-install-recommends \
+     curl \
+  && apt-get clean \
+  && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+
+# Run simple test to check if requests are answered
+RUN /bin/bash -c "duckling-example-exe -p 8008 --no-access-log --no-error-log & \
+  sleep 3 && \
+  response=$(curl -XPOST http://0.0.0.0:8008/parse --data 'locale=en_GB&text=42€') && \
+  label='{\"value\":42,\"type\":\"value\",\"unit\":\"EUR\"}' && \
+  if [[ '$response' == *'$label'* ]] ; then echo 'ok' ; exit 0 ; else echo 'error' ; exit -1 ; fi;"
+
+# Uninstall curl and it's dependencies again
+RUN apt-get remove -y curl && apt-get autoremove -y
+
+# Use port 8008 instead of default port, because port 8000 is already in use by portainer
+EXPOSE 8008
+
+CMD ["duckling-example-exe", "-p", "8008", "--no-access-log", "--no-error-log"]

Dockerfile_arm64

@@ -0,0 +1,73 @@
+# ==================================================================================================
+# === Build duckling library =======================================================================
+
+FROM docker.io/haskell:8 AS builder
+
+RUN apt-get update -qq \
+  && apt-get install -qq -y --fix-missing --no-install-recommends \
+     libpcre3 libpcre3-dev build-essential pkg-config wget \
+  && apt-get clean \
+  && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+
+# https://docs.haskellstack.org/en/stable/maintainers/releases/#setting-up-an-arm-vm-for-releases
+# Using apt-get install haskell-stack installs version 1.7.3 which is too old
+RUN wget https://github.com/commercialhaskell/stack/releases/download/v2.1.3/stack-2.1.3-linux-aarch64.tar.gz
+RUN tar -xf stack-*-linux-aarch64.tar.gz && \
+    cd stack-*-linux-aarch64/ && \
+    chmod +x stack && \
+    mv stack /usr/bin/
+RUN stack --version
+
+RUN mkdir /log/
+WORKDIR /duckling/
+
+ADD . .
+
+ENV LANG=C.UTF-8
+RUN stack setup --compiler ghc-8.10.7 --system-ghc
+
+# NOTE:`stack build` will use as many cores as are available to build
+# in parallel. However, this can cause OOM issues as the linking step
+# in GHC can be expensive. If the build fails, try specifying the
+# '-j1' flag to force the build to run sequentially.
+RUN stack install -j`nproc` --compiler ghc-8.10.7 --system-ghc --test --no-run-tests
+
+# Run tests. If tests are not built in above step, the main library would be rebuilt here as well.
+RUN stack test --compiler ghc-8.10.7 --system-ghc
+
+# ==================================================================================================
+# === Copy prebuilt files to new image to greatly reduce the image size ============================
+
+FROM docker.io/debian:buster AS base
+
+ENV LANG C.UTF-8
+
+RUN apt-get update -qq \
+  && apt-get install -qq -y --no-install-recommends \
+     libpcre3 libgmp10 libnuma1 \
+  && apt-get clean \
+  && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+
+COPY --from=builder /root/.local/bin/duckling-example-exe /usr/local/bin/
+
+# Additional dependencies are required for the following test
+RUN apt-get update -qq \
+  && apt-get install -y --no-install-recommends \
+     curl \
+  && apt-get clean \
+  && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+
+# Run simple test to check if requests are answered
+RUN /bin/bash -c "duckling-example-exe -p 8008 --no-access-log --no-error-log & \
+  sleep 5 && \
+  response=$(curl -XPOST http://0.0.0.0:8008/parse --data 'locale=en_GB&text=42€') && \
+  label='{\"value\":42,\"type\":\"value\",\"unit\":\"EUR\"}' && \
+  if [[ '$response' == *'$label'* ]] ; then echo 'ok' ; exit 0 ; else echo 'error' ; exit -1 ; fi;"
+
+# Uninstall curl and it's dependencies again
+RUN apt-get remove -y curl && apt-get autoremove -y
+
+# Use port 8008 instead of default port, because port 8000 is already in use by portainer
+EXPOSE 8008
+
+CMD ["duckling-example-exe", "-p", "8008", "--no-access-log", "--no-error-log"]

README.md

@@ -55,6 +55,22 @@ See `exe/ExampleMain.hs` for an example on how to integrate Duckling in your
 project.
 If your backend doesn't run Haskell or if you don't want to spin your own Duckling server, you can directly use [wit.ai](https://wit.ai)'s built-in entities.
 
+### Docker
+
+Alternatively build _duckling_ as a docker service:
+```bash
+docker build -t duckling_amd64 -f Dockerfile_amd64 .
+docker run -p 8008:8008 --rm duckling_amd64
+
+# Run request in another console window
+# Note that the port is different, because the default 8000 port is already used by portainer
+curl -XPOST http://0.0.0.0:8008/parse --data 'locale=en_GB&text=tomorrow at eight'
+
+# It's also possible to cross-build the image for a different architecture, but this might take some hours.
+sudo docker run --security-opt label=disable --rm --privileged multiarch/qemu-user-static --reset -p yes
+docker buildx build --platform=linux/arm64 -t duckling_arm64 -f Dockerfile_arm64 .
+```
+
 ## Supported dimensions
 
 Duckling supports many languages, but most don't support all dimensions yet