Devicehub

Devicehub is a distributed IT Asset Management System focused in reusing devices, created under the project eReuse.org

This README explains how to install and use Devicehub. The documentation explains the concepts and the API.

Devicehub is built with Teal and Flask.

Installing

The requirements are:

• Python 3.7.3 or higher. In debian 10 is # apt install python3.
• PostgreSQL 11 or higher.
• Weasyprint dependencie

Install Devicehub with pip: pip3 install -U -r requirements.txt -e .

Running

Create a PostgreSQL database called devicehub by running create-db:

• In Linux, execute the following two commands (adapt them to your distro):

  1. sudo su - postgres.
  2. bash examples/create-db.sh devicehub dhub, and password ereuse.

• In MacOS: bash examples/create-db.sh devicehub dhub, and password ereuse.

Configure project using environment file (you can use provided example as quickstart):

$ cp examples/env.example .env

Using the dh tool for set up with one or multiple inventories. Create the tables in the database by executing:

$  export dhi=dbtest;  dh inv add --common --name dbtest

Finally, run the app:

$ export dhi=dbtest;dh run --debugger

The error ‘bdist_wheel’ can happen when you work with a virtual environment. To fix it, install in the virtual environment wheel package. pip3 install wheel

Multiple instances

Devicehub can run as a single inventory or with multiple inventories, each inventory being an instance of the devicehub. To add a new inventory execute:

$ export dhi=dbtest;  dh inv add --name dbtest

Note: The dh command is like flask, but it allows you to create and delete instances, and interface to them directly.

Testing

1. git clone this project.
2. Create a database for testing executing create-db.sh like the normal installation but changing the first parameter from devicehub to dh_test: create-db.sh dh_test dhub and password ereuse.
3. Execute at the root folder of the project python3 setup.py test.

Migrations

At this stage, migration files are created manually. Set up the database:

$ sudo su - postgres
$ bash $PATH_TO_DEVIHUBTEAL/examples/create-db.sh devicehub dhub

Initialize the database:

$ export dhi=dbtest; dh inv add --common --name dbtest

This command will create the schemas, tables in the specified database. Then we need to stamp the initial migration.

$ alembic stamp head

This command will set the revision fbb7e2a0cde0_initial as our initial migration. For more info in migration stamping please see https://alembic.sqlalchemy.org/en/latest/cookbook.html

Whenever a change needed eg to create a new schema, alter an existing table, column or perform any operation on tables, create a new revision file:

$ alembic revision -m "A table change"

This command will create a new revision file with name <revision_id>_a_table_change. Edit the generated file with the necessary operations to perform the migration:

$ alembic edit <revision_id>

Apply migrations using:

$ alembic -x inventory=dbtest upgrade head

Then to go back to previous db version:

$ alembic -x inventory=dbtest downgrade <revision_id>

To see a full list of migrations use

$ alembic history

Upgrade a deployment

For upgrade an instance of devicehub you need to do:

$ cd $PATH_TO_DEVIHUBTEAL
$ source venv/bin/activate
$ git pull
$ alembic -x inventory=dbtest upgrade head

If all migrations pass successfully, then it is necessary restart the devicehub. Normaly you can use a little script for restart.

# sh gunicorn_api.sh

Generating the docs

1. git clone this project.
2. Install plantuml. In Debian 9 is # apt install plantuml.
3. Execute pip3 install -e .[docs] in the project root folder.
4. Go to <project root folder>/docs and execute make html. Repeat this step to generate new docs.

To auto-generate the docs do pip3 install -e .[docs-auto], then execute, in the root folder of the project sphinx-autobuild docs docs/_build/html.