generate_client

#!/bin/bash

function _exit {
    echo "$1" >&2
    exit 1
}

# Exit if cluster name was not specified as a first argument.
[[ "$1" ]] || _exit "Please specify cluster as an argument."

CGEN_NAME="swagger-codegen-cli"
CGEN_VER="2.4.32"  # For 3.x use CGEN_VER="3.0.42"
CGEN_JAR_NAME="${CGEN_NAME}-${CGEN_VER}.jar"
CGEN_JAR_URL="https://search.maven.org/remotecontent?filepath=\
io/swagger/swagger-codegen-cli/${CGEN_VER}/${CGEN_JAR_NAME}"
# io/swagger/codegen/v3/swagger-codegen-cli/${CGEN_VER}/${CGEN_JAR_NAME}"
# Uncomment above if you'd like to use swagger-codegen-cli version 3.x

CONFIG_FILE=".swagger-codegen/config.json"
EXTRA_PROPS="basePath=https://YOUR_INSTANCE.wavefront.com"
EXTRA_PROPS+=",infoEmail=chitimba@wavefront.com"

SWGR_JSON="swagger.json"
SWGR_URL="https://$1.wavefront.com/api/v2/${SWGR_JSON}"
VERSION_URL="https://$1.wavefront.com/auth/forgetPassword"

PYTHON=$(command -v python3 || command -v python)

# Make sure required python version and curl tool are present or exit.
$PYTHON -V | grep -q "Python 3" || _exit "Python ^^^ is obsolete. Aborting."
[[ "$(command -v curl)" ]] || _exit "The curl command was not found. Aborting."

# Check if config file exists in '.swagger-codegen' directory.
[[ -f "${CONFIG_FILE}" ]] || _exit "File '${CONFIG_FILE}' not found."

# Get the current version from the config file.
CONFIG_VER=$($PYTHON -c "import json, sys;\
  sys.stdout.write(json.load(sys.stdin)['packageVersion'][2:]+'\n')"\
  < "${CONFIG_FILE}"
)
echo "Fetching the current version from '$1' cluster..."
SERVER_VER=$(curl -s "${VERSION_URL}" | grep 'version: ' |\
             grep -o '[0-9]\+\.[0-9]\+')

echo "Current Version on server is: ${SERVER_VER}"
echo "Current Version in config is: ${CONFIG_VER}"

if [[ -z "${CONFIG_VER}" || -z "${SERVER_VER}" ]]; then
  _exit "Unable to determine the version for '$1' cluster."
elif [[ "${CONFIG_VER}" == "${SERVER_VER}" ]]; then
  echo "No Version Change Detected. Bye."
else
  echo "Version change detected from ${CONFIG_VER} to ${SERVER_VER}..."
  TEMP_DIR_NAME="$(mktemp -d)"
  SWAGGER_FILE="${TEMP_DIR_NAME}/${SWGR_JSON}"
  CGEN_JAR_BINARY="${TEMP_DIR_NAME}/${CGEN_JAR_NAME}"

  echo "Step 1: Fetching the latest swagger-codegen..."
  curl -Ls "${CGEN_JAR_URL}" -o "${CGEN_JAR_BINARY}"

  echo "Step 2: Fetching the config from '${SWGR_URL}'..."
  curl -s "${SWGR_URL}" | $PYTHON -m json.tool --sort-keys > "${SWAGGER_FILE}"

  # Exit if swagger file is missing at this point.
  [[ -f "${SWAGGER_FILE}" ]] || _exit "Failed to fetch ${SWGR_JSON}."

  echo "Step 3: Generating the client..."
  java -jar "${CGEN_JAR_BINARY}" generate -l python \
       -c "${CONFIG_FILE}" -i "${SWAGGER_FILE}" \
       --additional-properties "${EXTRA_PROPS}"

  echo "Step 4: Checking if anything has changed..."
  if [[ -n "$(git status --porcelain)" ]]; then  # non-zero diff detected.
    echo "Step 5: Updating the version in the config..."
    sed -ie "s/${CONFIG_VER//./\\.}/${SERVER_VER//./\\.}/" "${CONFIG_FILE}"

    echo "Step 6: Generating the updated client..."
    java -jar "${CGEN_JAR_BINARY}" generate -l python \
         -c "${CONFIG_FILE}" -i "${SWAGGER_FILE}" \
         --additional-properties "${EXTRA_PROPS}"

    echo "Step 7: Committing the updated files..."
    git add -A && git commit -am "Autogenerated Update v2.${SERVER_VER}."

    echo "Please run git push in order to push commit to GitHub... Bye."
  fi
  echo "Cleaning up..." && rm -rv "${TEMP_DIR_NAME}"
fi