Added migrations not up to date warning

.drone.yml

@@ -1,3 +1,19 @@
+# Mentorenwahl: A fullstack application for assigning mentors to students based on their whishes.
+# Copyright (C) 2022  Dominic Grimm
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
 ---
 kind: pipeline
 type: docker

.example.env

@@ -1,3 +1,19 @@
+# Mentorenwahl: A fullstack application for assigning mentors to students based on their whishes.
+# Copyright (C) 2022  Dominic Grimm
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
 # General
 URL=
 

config/nginx/nginx.conf

@@ -1,3 +1,17 @@
+# Mentorenwahl: A fullstack application for assigning mentors to students based on their whishes.
+# Copyright (C) 2022  Dominic Grimm
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
 events {
 }
 

docker-compose.yml

@@ -1,3 +1,19 @@
+# Mentorenwahl: A fullstack application for assigning mentors to students based on their whishes.
+# Copyright (C) 2022  Dominic Grimm
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
 version: "3"
 
 services:

docker/backend/.dockerignore

@@ -1,3 +1,19 @@
+# Mentorenwahl: A fullstack application for assigning mentors to students based on their whishes.
+# Copyright (C) 2022  Dominic Grimm
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
 /docs/
 /lib/
 /bin/

docker/backend/.editorconfig

@@ -1,3 +1,19 @@
+# Mentorenwahl: A fullstack application for assigning mentors to students based on their whishes.
+# Copyright (C) 2022  Dominic Grimm
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
 root = true
 
 [*.cr]

docker/backend/.gitignore

@@ -1,3 +1,19 @@
+# Mentorenwahl: A fullstack application for assigning mentors to students based on their whishes.
+# Copyright (C) 2022  Dominic Grimm
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
 /docs/
 /lib/
 /bin/

docker/backend/shard.lock

@@ -96,6 +96,10 @@ shards:
     git: https://github.com/stefanwille/crystal-redis.git
     version: 2.8.3
 
+  retriable:
+    git: https://github.com/sija/retriable.cr.git
+    version: 0.2.4
+
   router:
     git: https://github.com/tbrand/router.cr.git
     version: 0.2.8

docker/backend/shard.yml

@@ -1,3 +1,19 @@
+# Mentorenwahl: A fullstack application for assigning mentors to students based on their whishes.
+# Copyright (C) 2022  Dominic Grimm
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
 name: backend
 version: 0.1.0
 
@@ -48,3 +64,5 @@ dependencies:
     git: https://git.dergrimm.net/dergrimm/ldap_escape.git
   shard:
     github: maiha/shard.cr
+  retriable:
+    github: Sija/retriable.cr

docker/backend/src/backend.cr

@@ -14,6 +14,8 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
+require "retriable/core_ext/kernel"
+
 require "./backend/*"
 
 # Base module

docker/backend/src/backend/db.cr

@@ -22,6 +22,23 @@ require "./db/*"
 module Backend
   # Database model definitions
   module Db
+    extend self
+
     Granite::Connections << Granite::Adapter::Pg.new(name: "pg", url: Backend.config.db.url)
+
+    # Checks if database schema is up to date
+    def schema_up_to_date_compare : Int32?
+      migrations = Dir["db/migrations/*.sql"].map { |f| Path[f].basename }.sort!
+      latest_migration = migrations.try(&.last.match(/\d+/).try(&.to_a.first.not_nil!.to_u64))
+      if latest_migration.nil?
+        return nil
+      end
+
+      begin
+        MicrateDbVersion.order(tstamp: :desc).limit(1).assembler.select.run.first.version_id <=> latest_migration
+      rescue PQ::PQError
+        nil
+      end
+    end
   end
 end

docker/backend/src/backend/db/micrate_db_version.cr

@@ -0,0 +1,29 @@
+# Mentorenwahl: A fullstack application for assigning mentors to students based on their whishes.
+# Copyright (C) 2022  Dominic Grimm
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+module Backend
+  module Db
+    # Micrate DB migrator model / configuration
+    class MicrateDbVersion < Granite::Base
+      table micrate_db_version
+
+      column id : Int32, primary: true
+      column version_id : Int64
+      column is_applied : Bool
+      column tstamp : Time?
+    end
+  end
+end

docker/backend/src/backend/run.cr

@@ -22,21 +22,37 @@ module Backend
     {% if flag?(:development) %}
       Log.warn { "Backend is running in development mode! Do not use this in production!" }
     {% end %}
+
+    Log.info { "Checking if DB schema is up to date..." }
+    retry(backoff: false, base_interval: 10.seconds, multiplier: 1.0) do
+      case retry(on: DB::ConnectionRefused, backoff: false) do
+        Db.schema_up_to_date_compare
+      end
+      when nil
+        Log.fatal { "No database schema is applied. Please run `bash scripts/micrate.sh up` urgently!" }
+        raise Exception.new
+      when -1
+        Log.warn { "Database schema is not up to date. Please run `bash scripts/micrate.sh up`." }
+      when 0
+        Log.info { "Database schema is up to date." }
+      else
+        Log.warn { "Database schema is maybe up to date but not consistent. Please run `bash scripts/micrate.sh up` to be safe." }
+      end
+    end
+
     Log.info { "Starting services..." }
-
     channel = Channel(Nil).new(SERVICES.size)
-
     SERVICES.each do |service|
       spawn do
         service.call
         channel.send(nil)
       end
     end
-
     SERVICES.size.times do
       channel.receive
     end
     Fiber.yield
+
     Log.info { "Backend services started." }
   end
 end

scripts/backend.sh

@@ -1,3 +1,19 @@
 #!/usr/bin/env bash
 
+# Mentorenwahl: A fullstack application for assigning mentors to students based on their whishes.
+# Copyright (C) 2022  Dominic Grimm
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
 docker-compose exec backend ./bin/backend "$@"

scripts/micrate.sh

@@ -1,3 +1,19 @@
 #!/usr/bin/env bash
 
+# Mentorenwahl: A fullstack application for assigning mentors to students based on their whishes.
+# Copyright (C) 2022  Dominic Grimm
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
 docker-compose exec backend ./bin/micrate "$@"