fix: dev: [rocketchat,mongo] do not use ``$PROJECT_NAME`` in mongo database url.

Indeed, when changing project name, ``rocketchat`` would create a new
database and would not be able to use previous database.

``mongo`` side is here to ensure proper update of existing installation
that would use previous naming scheme.

Signed-off-by: Valentin Lab <valentin.lab@kalysto.org>

mongo/hooks/mongo_database-relation-joined

@@ -10,6 +10,33 @@ DBNAME=$(relation-get dbname) || {
 }
 
 
+dbs=$(mongo:db:ls) || exit 1
+if matching_db=$(e "$dbs" | egrep "[a-zA-Z0-9.-_]*_${DBNAME}"); then
+    if e "$dbs" | grep "^${DBNAME}$"; then
+        err "Error: unexpected database '$matching_db'" \
+            "found along with database named '${DBNAME}'."
+        exit 1
+    fi
+    ## Let's take for granted that only current source service is
+    ## concerned by the database. We need to restart source service
+    ## container only if already running.
+    container_ids=($(get_running_containers_for_service "$MASTER_BASE_SERVICE_NAME"))
+    for container_id in "${container_ids[@]}"; do
+        mongo_url=$(docker:container:env_get "$container_id" MONGO_URL) || return 1
+        if [[ "$mongo_url" == */"${matching_db}"* ]]; then
+            info "Attempting to stop current containers of service $MASTER_BASE_SERVICE_NAME"
+            docker stop -t 5 "$container_id"
+        fi
+    done
+
+    mongo:db:rename "$matching_db" "${DBNAME}"
+
+    ## we DO NOT want to start the stopped container again as they are not
+    ## properly configured
+fi
+
+## ReplicaSet initialization
+
 cmd="rs.initiate({ _id: 'rs01', members: [ { _id: 0, host: '$TARGET_SERVICE_NAME:27017' } ]})"
 debug "${WHITE}running:$NORMAL $cmd"
 

mongo/lib/common

@@ -27,4 +27,30 @@ _set_db_params() {
     check_command="db.serverStatus().ok"
 }
 
-ddb () { dcmd mongo "$@"; }
+ddb() { dcmd mongo --quiet "$@"; }
+
+
+mongo:db:ls() {
+    local out
+    if ! out=$(ddb < <(echo "JSON.stringify(db.adminCommand( { listDatabases: 1 } ))")); then
+        err "Could not query list of databases."
+        return 1
+    fi
+    e "$out" | jq -r '.databases[] | .name'
+}
+
+
+mongo:db:rename() {
+    local src="$1" dst="$2" out
+    if ! out=$(ddb <<EOF
+db.copyDatabase("$src","$dst");
+use $src;
+db.dropDatabase();
+EOF
+); then
+        err "Could not rename database '$src' to '$dst'."
+        err "$out"
+        return 1
+    fi
+    debug "$out"
+}

rocketchat/hooks/mongo_database-relation-joined

@@ -5,7 +5,7 @@ set -e
 
 DBNAME="$(relation-get dbname)" || exit 1
 
-MONGO_URL=mongodb://${TARGET_SERVICE_NAME}:27017/${PROJECT_NAME}_${DBNAME}?replicaSet=rs01
+MONGO_URL=mongodb://${TARGET_SERVICE_NAME}:27017/${DBNAME}?replicaSet=rs01
 MONGO_OPLOG_URL=mongodb://${TARGET_SERVICE_NAME}:27017/local?replicaSet=rs01
 
 config-add "\