# Scheduling Reports with Lambda

Opensearch reporting CLI can be used with Lambda for scheduling email reports.

### Prerequisites

- AMD64 Systems
- Docker

### Creating Lambda container image

1. Create a Dockerfile. Following Dockerfile can be used to create a container image for v1.0.0.
  ```dockerfile
  # Define function directory
  ARG FUNCTION_DIR="/function"

  # Base image of the docker container
  FROM node:lts-slim as build-image

  # Include global arg in this stage of the build
  ARG FUNCTION_DIR

  # AWS Lambda runtime dependencies
  RUN apt-get update && \
      apt-get install -y \
          g++ \
          make \
          unzip \
          libcurl4-openssl-dev \
          autoconf \
          automake \
          libtool \
          cmake \
          python3 \
          libkrb5-dev \
          curl

  # Copy function code
  WORKDIR ${FUNCTION_DIR}
  RUN npm install @opensearch-project/reporting-cli && npm install aws-lambda-ric

  # Build Stage 2: Copy Build Stage 1 files in to Stage 2. Install chromium dependencies and chromium.
  FROM node:lts-slim
  # Include global arg in this stage of the build
  ARG FUNCTION_DIR
  # Set working directory to function root directory
  WORKDIR ${FUNCTION_DIR}
  # Copy in the build image dependencies
  COPY --from=build-image ${FUNCTION_DIR} ${FUNCTION_DIR}

  # Install latest chrome dev package and fonts to support major charsets (Chinese, Japanese, Arabic, Hebrew, Thai and a few others)
  # Note: this installs the necessary libs to make the bundled version of Chromium that Puppeteer installs, work.
  RUN apt-get update \
      && apt-get install -y wget gnupg \
      && wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | apt-key add - \
      && sh -c 'echo "deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main" >> /etc/apt/sources.list.d/google.list' \
      && apt-get update \
      && apt-get install -y google-chrome-stable fonts-ipafont-gothic fonts-wqy-zenhei fonts-thai-tlwg fonts-kacst fonts-freefont-ttf libxss1 \
        --no-install-recommends \
      && apt-get remove -y google-chrome-stable \
      && rm -rf /var/lib/apt/lists/*

  ENTRYPOINT ["/usr/local/bin/npx", "aws-lambda-ric"]

  ENV HOME="/tmp"
  CMD [ "/function/node_modules/@opensearch-project/reporting-cli/src/index.handler" ]
  ```

2. Run the build command in from the directory where Dockerfile exists.

  ```
  docker build -t opensearch-reporting-cli .
  ```
### Use Lambda container image

1. Push the Docker image to [Amazon ECR](https://docs.aws.amazon.com/AmazonECR/latest/userguide/getting-started-console.html)

2. Create a Lambda Function. Select previously created container image and architecture x86_64'.

3. Update Lambda timeout to 5 min and memory size to at least 1024MB.