QWC Permalink Service

Stores and resolves compact permalinks for the Web Client.

Permalinks are stored in a database table.

Configuration

The static config files are stored as JSON files in $CONFIG_PATH with subdirectories for each tenant, e.g. $CONFIG_PATH/default/*.json. The default tenant name is default.

JSON config

JSON schema
File location: $CONFIG_PATH/<tenant>/permalinkConfig.json

Example:

{
  "$schema": "https://raw.githubusercontent.com/qwc-services/qwc-permalink-service/master/schemas/qwc-permalink-service.json",
  "service": "permalink",
  "config": {
    "db_url": "postgresql:///?service=qwc_configdb",
    "permalinks_table": "qwc_config.permalinks",
    "user_permalink_table": "qwc_config.user_permalinks"
  }
}

Environment variables

Config options in the config file can be overridden by equivalent uppercase environment variables.

Variable	Default value	Description
`DB_URL`	`postgresql:///?service=qwc_configdb`	DB connection URL [1]
`PERMALINKS_TABLE`	`qwc_config.permalinks`	Permalink table
`USER_PERMALINK_TABLE`	`qwc_config.user_permalinks`	User permalink table

[1] https://docs.sqlalchemy.org/en/13/core/engines.html#postgresql

If you don't use qwc-config-db you have to create the tables for storing permalinks first. Example:

CREATE TABLE permalinks
(
  key character(10) NOT NULL PRIMARY KEY,
  data text,
  date date
);

Usage

Base URL:

http://localhost:5018/

API documentation:

http://localhost:5018/api/

Docker usage

To run this docker image you will need a configuration database. For testing purposes you can use the demo DB.

The following steps explain how to download the demo DB docker image and how to run the qwc-permalink-service with docker-compose.

Step 1: Clone qwc-docker

git clone https://github.com/qwc-services/qwc-docker
cd qwc-docker

Step 2: Create docker-compose.yml file

cp docker-compose-example.yml docker-compose.yml

Step 3: Start docker containers

docker-compose up qwc-permalink-service

For more information please visit: https://github.com/qwc-services/qwc-docker

Development

Create a virtual environment:

virtualenv --python=/usr/bin/python3 .venv

Activate virtual environment:

source .venv/bin/activate

Install requirements:

pip install -r requirements.txt

Set the CONFIG_PATH environment variable to the path containing the service config and permission files when starting this service (default: config).

export CONFIG_PATH=../qwc-docker/demo-config

Configure environment:

echo FLASK_ENV=development >.flaskenv

Start local service:

python server.py

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