feature/mongo (#165)

* WIP: start mongo engine

* WIP: mongo accessor and admin

* integrate mongo store to main

* disable mongo tests by default, only in CI

* connection with constructor

* add mongo buffered writer

* buffered mongo writer

* fix nil responses on an empty list from mongo

* missing mongo index for scores

* cancelable store

* add gridfs implementation of avatar store

* fix race on mongo session copy

* gridfs avatars without tmp files

* move avatar store

* minor comments and refactoring for avatar store

* merged from current master

* simplify gridfs reader

* lint: fix minor warns

* test mongo against env defined url

* pass MONGO_REMARK_TEST to docker and travis

* set dockerfile env for mongo test url

* increase connect timeout in mongo tests

* pass MONGO_REMARK_TEST to drone build

* add MONGO_REMARK_TEST to branch stage of drone

* mass mongo test url via build_args_from_env

* populate mongo IP to docker build hosts

* test env

* pass mongo ip via .mongo

* remove .mongo temp from git

* add .mongo -> env to linter step

* allow more time to autoflush writer test

* default mongo tests to "mongo" if not in env

* merge fresh master into

* add test for mongo cleanup

* msg for a failed test

* lazy fix for failed test

* add an ability to skip all mongo tests

* add backend dev instructions

* remove unused code from mongo server

* move mongo testing to connection_test

* restore testing.go

* lint: minor warns for testing code

backend/scripts/restore-backup.sh

@@ -5,6 +5,7 @@ BACKUP_PATH=${BACKUP_PATH:-./var}
 echo "unpack $1"
 gunzip -c ${BACKUP_PATH}/$1 >/tmp/backup.remark
 
+echo "source file info"
 ls -la /tmp/backup.remark
 
 curl -X POST -H "Content-Type: application/json" --data-binary @/tmp/backup.remark "http://127.0.0.1:8081/api/v1/admin/import?site=${2}&provider=native&secret=${SECRET}"