### This file is not meant to be run directly, but to be sourced from
### the dev script. It defines all the functions required to run a
### postgres docker container.


######################
#    Configuration   #
######################

if [ "$MODE" = "test" ]; then
  PG_PORT=35432
else
  PG_PORT=25432
fi

PG_PASSWORD=postgres
PG_CONTAINER_NAME="hasura-dev-postgres-$PG_PORT"
PG_DB_URL="postgres://postgres:$PG_PASSWORD@127.0.0.1:$PG_PORT/postgres"
PG_DOCKER="docker exec -u postgres -it $PG_CONTAINER_NAME psql $PG_DB_URL"

# NOTE FWIW:
#   Brandon tried these options to speed up integration tests, but to little effect:
#       fsync=off
#       synchronous_commit=off
#       full_page_writes=off
#   ...as well as ramdisk for pg data:
#       --mount type=tmpfs,destination=/var/lib/postgresql/data \

# Useful development defaults for postgres (no spaces here, please):
#
# setting 'port' in container is a workaround for the pg_dump endpoint (see tests)
# log_hostname=off to avoid timeout failures when running offline due to:
#   https://forums.aws.amazon.com/thread.jspa?threadID=291285
#
# All lines up to log_error_verbosity are to support pgBadger:
#   https://github.com/darold/pgbadger#LOG-STATEMENTS
#
# Also useful:
#   log_autovacuum_min_duration=0
CONF=$(cat <<-EOF
log_min_duration_statement=0
log_checkpoints=on
log_connections=on
log_disconnections=on
log_lock_waits=on
log_temp_files=0
log_error_verbosity=default
log_hostname=off
log_duration=on
port=$PG_PORT
EOF
)

# log lines above as -c flag arguments we pass to postgres
CONF_FLAGS=$(echo "$CONF" | sed  -e 's/^/-c /'  | tr '\n' ' ')


######################
#     Functions      #
######################

function pg_launch_container(){
  echo_pretty "Launching postgres container: $PG_CONTAINER_NAME"
  docker run \
    --name "$PG_CONTAINER_NAME" \
    -p 127.0.0.1:"$PG_PORT":$PG_PORT \
    --expose="$PG_PORT" \
    -e POSTGRES_PASSWORD="$PG_PASSWORD" \
    -d circleci/postgres:11.5-alpine-postgis \
    $CONF_FLAGS

  # graphql-engine calls the pg_dump executable. To avoid a version mismatch (and
  # the dependency entirely) we create a shim that executes the pg_dump in the
  # postgres container. Note output to file won't work.
  DEV_SHIM_PATH="/tmp/hasura-dev-shims-$PG_PORT"
  mkdir -p "$DEV_SHIM_PATH"
  cat >"$DEV_SHIM_PATH/pg_dump" <<EOL
#!/bin/bash
# Generated from: $0
if [[ \$@ == *" -f"* ]]; then
  echo "It looks like we're trying to pg_dump to a file, but that won't work with this shim. See $0" >&2
  exit 1
fi
docker exec -u postgres $PG_CONTAINER_NAME pg_dump "\$@"
EOL
  chmod a+x "$DEV_SHIM_PATH/pg_dump"
  export PATH="$DEV_SHIM_PATH":$PATH
}

function pg_wait {
  echo -n "Waiting for postgres to come up"
  until ( $PG_DOCKER -c '\l' ) &>/dev/null; do
    echo -n '.' && sleep 0.2
  done
  echo " Ok"
}

function pg_cleanup(){
  # Since scripts here are tailored to the env we've just launched:
  rm -r "$DEV_SHIM_PATH"

  echo_pretty "Removing $PG_CONTAINER_NAME and its volumes in 5 seconds!"
  echo_pretty "  PRESS CTRL-C TO ABORT removal of all containers, or ENTER to clean up right away"
  read -t5 || true
  docker stop "$PG_CONTAINER_NAME"
  docker rm -v "$PG_CONTAINER_NAME"
}