#!/bin/bash

## Init is run on host
## For now it is run every time the script is launched, but
## it should be launched only once after build.

## Accessible variables are:
## - SERVICE_NAME        Name of current service
## - DOCKER_BASE_IMAGE   Base image from which this service might be built if any
## - SERVICE_DATASTORE           Location on host of the DATASTORE of this service
## - SERVICE_CONFIGSTORE         Location on host of the CONFIGSTORE of this service

. lib/common

set -e

uid=$(docker_get_uid "$SERVICE_NAME" "mongodb")

## Check for old bogus version, and stop and remove container
## if it is running.

containers=($(get_running_containers_for_service "$SERVICE_NAME"))

if [[ "${#containers[@]}" -gt 1 ]]; then
    err "More than 1 container running for service $DARKYELLOW$SERVICE_NAME$NORMAL."
    echo "  Please contact administrator to fix this issue." >&2
    return 1
fi

if [[ "${#containers[@]}" == 1 ]]; then
    ## We need to check that this running container
    ## has same uid as the new image. If not, we need
    ## to stop and remove it.
    container_id=${containers[0]}
    container_uid=$(docker exec "$container_id" id -u mongodb)
    if [[ "$container_uid" != "$uid" ]]; then
        info "Container $container_id is running with different uid than new image."
        info "Stopping container $container_id."
        docker stop "$container_id" &&
            docker rm "$container_id"
    fi
fi


##
## Normal init
##


CONFIG=$SERVICE_CONFIGSTORE/etc/mongod.conf

mkdir -p "$(dirname "$CONFIG")"
## XXXvlab: replication here is hardwired and not handled at all
cat <<EOF > "$CONFIG"
storage:
  dbPath: /var/lib/mongodb
net:
  bindIp: 0.0.0.0
replication:
  oplogSizeMB: 128
  replSetName: rs01
EOF
chown -v "$uid" "$CONFIG"


dirs=(/var/{log,lib}/mongodb )
host_dirs=()
for dir in "${dirs[@]}"; do
    host_dirs+=("$SERVICE_DATASTORE$dir")
done

mkdir -p "${host_dirs[@]}"
find "${host_dirs[@]}" \! -user "$uid" -print0 | while read-0 f; do
    chown -v "$uid" "$f" || exit 1
done


config_hash=$(cat "$CONFIG" | md5_compat) || exit 1
init-config-add "
$MASTER_BASE_SERVICE_NAME:
  labels:
    - compose.config_hash=$config_hash
"




ensure_db_docker_running


## ReplicaSet initialization

cmd="rs.initiate({ _id: 'rs01', members: [ { _id: 0, host: '$SERVICE_NAME:27017' } ]})"
debug "${WHITE}running:$NORMAL $cmd"

out=$(ddb 2>&1 <<<"$cmd") || true

if [[ "$out" == *"\"codeName\" : \"AlreadyInitialized\""* ]] ||
       [[ "$out" == *"MongoServerError: already initialized"* ]]; then
    info "ReplicaSet already initialized."
elif [[ "$out" == *"\"ok\" : 1"* ]]; then
    info "ReplicaSet initialized. "
else
    err "ReplicaSet initialisation failed:"
    echo "$out" >&2
    exit 13
fi