deploy

#!/usr/bin/env bash
[[ -n "$TRACE" ]] && set -x
set -eo pipefail

readonly SOURCE_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
readonly APPS_DIR_RELATIVE="${APPS_DIR_RELATIVE:-/apps}"
readonly APPS_DIR="${APPS_DIR:-${SOURCE_DIR}${APPS_DIR_RELATIVE}}"
readonly DASH_ENTERPRISE_URL="${DASH_ENTERPRISE_URL:-https://dash-playground.plotly.host}"
readonly CREATE_APP="${CREATE_APP:-false}"
readonly ALLOW_DASHR="${ALLOW_DASHR:-false}"

log-header() {
  declare desc="Log header formatter";
  echo "====> $*"
}

log-info() {
  declare desc="Log info formatter";
  echo "      $*"
}

log-warn() {
  declare desc="Log warn formatter";
  echo " ?    $*" 1>&2
}

log-fail() {
  declare desc="Log fail formatter";
  echo " !    $*" 1>&2
  exit 1
}

log-exit() {
  declare desc="Log exit formatter";
  echo " !    $*" 1>&2
  exit 0
}

fn-check-env() {
  declare APP="$1"

  if grep -Fxq "$APP" "$SOURCE_DIR/.deployignore"; then
    log-exit "App $APP is in the .deployignore file, skipping deploy"
  fi

  if ! command -v "dds-client" >/dev/null; then
    log-fail "dds-client binary not found"
  fi

  if [[ -z "$DASH_ENTERPRISE_API_KEY" ]]; then
    log-fail "DASH_ENTERPRISE_API_KEY is not defined"
  fi

  if [[ -z "$DASH_ENTERPRISE_USERNAME" ]]; then
    log-fail "DASH_ENTERPRISE_USERNAME is not defined"
  fi

  if [[ -z "$DASH_ENTERPRISE_URL" ]]; then
    log-fail "DASH_ENTERPRISE_URL is not defined"
  fi

  if [[ -z "$CIRCLE_SHA1" ]]; then
    log-fail "CIRCLE_SHA1 is not defined"
  fi
}

main() {
  declare APP="$1"
  local app_dir="$APPS_DIR/$APP"
  local remote_url="$DASH_ENTERPRISE_URL/GIT/$APP"
  local is_dashr=false
  local tmp_shallow_clone="$(mktemp -d -t apps-XXXXXXXXXX)"
  local tmp_full_clone="$(mktemp -d -t apps-XXXXXXXXXX)"
  local force_push=false
  local push_code=false
  local exit_code remote_sha
  trap "rm -rf '$tmp_shallow_clone' '$tmp_full_clone' >/dev/null" RETURN INT TERM EXIT

  fn-check-env "$APP"

  if [[ -z "$APP" ]]; then
    log-fail "No app name specified"
  fi

  if [[ ! -d "$app_dir" ]]; then
    log-fail "Invalid app name: $APP"
  fi

  if [[ "$APP" =~ "dashr" ]]; then
    is_dashr=true
    if [[ "$ALLOW_DASHR" != "true" ]]; then
      log-exit "App $APP is a dashr app, skipping deploy"
    fi
  fi

  if [[ ! -d "$app_dir/assets" ]]; then
    log-fail "App $APP is missing the assets directory"
  fi

  log-header "Deploying $APP"
  log-info "dashr: ${is_dashr}"
  if [[ "$is_dashr" == "false" ]]; then
    local celery_version="$(cat "$app_dir/requirements.txt" | grep -E "^celery=")"
    local redis_version="$(cat "$app_dir/requirements.txt" | grep -E "^redis=")"

    log-info "dash python version: $(cat "$app_dir/requirements.txt" | grep -E "^dash=")"
    [[ -n "$celery_version" ]] && log-info "celery python version: $(cat "$app_dir/requirements.txt" | grep -E "^celery=")"
    [[ -n "$redis_version" ]] && log-info "redis python version: $(cat "$app_dir/requirements.txt" | grep -E "^redis=")"

    if [[ -n "$celery_version" ]] || [[ -n "$redis_version" ]]; then
      log-exit "Skipping service that requires a redis instance"
    fi
  fi

  if ! dds-client apps:exists --name "$APP" >/dev/null 2>&1; then
    log-info "exists: false"
    if [[ "$CREATE_APP" == "true" ]]; then
      log-warn "$APP not found, creating"
      dds-client apps:create --name "$APP"
    else
      log-exit "Deploy failed because there is no such app on Dash Gallery: $APP. Please use the web interface to create an app with this name"
    fi
  else
    log-info "exists: true"
  fi

  if ! git clone --depth 1 "$remote_url" "$tmp_shallow_clone" 2>/dev/null; then
    log-fail "Unable to clone repository"
  fi

  remote_sha=$(git -C "$tmp_shallow_clone" log --pretty=format:"%h" 2>/dev/null || true)  
  log-info "remote-sha: $remote_sha"
  if [[ -z "$remote_sha" ]]; then
    log-header "Initializing repository"
    git -C "$tmp_full_clone" init -q
    git -C "$tmp_full_clone" remote rm origin 2>/dev/null || true
    git -C "$tmp_full_clone" remote add origin "$remote_url"
  elif git show "$remote_sha" >/dev/null 2>&1; then
    log-header "Existing repository uses old monorepo, recreating"
    git -C "$tmp_full_clone" init -q
    git -C "$tmp_full_clone" remote rm origin 2>/dev/null || true
    git -C "$tmp_full_clone" remote add origin "$remote_url"
    force_push=true
  else
    if ! git clone "$remote_url" "$tmp_full_clone" 2>/dev/null; then
      log-fail "Unable to clone repository"
    fi
  fi

  log-header "Ensuring code is up to date"
  log-info "Copying updated app source"
  pushd "$tmp_full_clone" >/dev/null
  find -not -path "./.git/*" -not -name ".git" -delete 2> /dev/null
  popd >/dev/null

  pushd "$app_dir" >/dev/null
  cp -Rfp * "$tmp_full_clone"
  [[ -f .buildpacks ]] && cp -fp .buildpacks "$tmp_full_clone/.buildpacks"
  [[ -f .gitignore ]] && cp -fp .gitignore "$tmp_full_clone/.gitignore"
  popd >/dev/null

  if [[ "$is_dashr" == false ]]; then
    log-info "Python app detected, injecting common python-specific files"
    cp -p "$SOURCE_DIR/app.json" "$tmp_full_clone/app.json"
    cp -p "$SOURCE_DIR/predeploy.py" "$tmp_full_clone/predeploy.py"
    test -f "$tmp_full_clone/runtime.txt" || cp -p "$SOURCE_DIR/runtime.txt" "$tmp_full_clone/runtime.txt"
  fi

  set +e
  git -C "$tmp_full_clone" status | grep -Eo "working (directory|tree) clean" &> /dev/null
  exit_code="$?"
  set -e

  if [[ "$exit_code" -ne 0 ]]; then
    pushd "$tmp_full_clone" >/dev/null
    push_code=true
    git add .
    git commit -qm "Deployed commit: $CIRCLE_SHA1"
    popd >/dev/null
  fi

  if [[ "$push_code" != "true" ]]; then
    log-header "🤜 App not updated, skipping deploy"
    log-info "Check app out at $DASH_ENTERPRISE_URL/$APP/"
    return 0
  fi

  if [[ "$force_push" == "true" ]]; then
    log-header "Deploying via force push"
    git -C "$tmp_full_clone" push --force origin master
  else
    log-header "Deploying"
    git -C "$tmp_full_clone" push origin master
  fi
}

main "$@"