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pgAdmin 4

pgAdmin 4 is a rewrite of the popular pgAdmin3 management tool for the PostgreSQL (http://www.postgresql.org) database.

In the following documentation and examples, $PGADMIN4_SRC/ is used to denote the top-level directory of a copy of the pgAdmin source tree, either from a tarball or a git checkout.

Architecture

pgAdmin 4 is written as a web application in Python, using jQuery and Bootstrap for the client side processing and UI. On the server side, Flask is being utilised.

Although developed using web technologies, pgAdmin 4 can be deployed either on a web server using a browser, or standalone on a workstation. The runtime/ subdirectory contains an NWjs based runtime application intended to allow this, which will execute the Python server and display the UI.

Building the Runtime

To build the runtime, the following packages must be installed:

  • NodeJS 12+
  • Yarn

Change into the runtime directory, and run yarn install. This will install the dependencies required.

In order to use the runtime in a development environment, you'll need to copy dev_config.json.in file to dev_config.json, and edit the paths to the Python executable and pgAdmin.py file, otherwise the runtime will use the default paths it would expect to find in the standard package for your platform.

You can then execute the runtime by running something like:

node_modules/nw/nwjs/nw .

or on macOS:

node_modules/nw/nwjs/nwjs.app/Contents/MacOS/nwjs .

Configuring the Python Environment

In order to run the Python code, a suitable runtime environment is required. Python version 3.6 and later are currently supported. It is recommended that a Python Virtual Environment is setup for this purpose, rather than using the system Python environment. On Linux and Mac systems, the process is fairly simple - adapt as required for your distribution:

  1. Create a virtual environment in an appropriate directory. The last argument is the name of the environment; that can be changed as desired:

    $ python3 -m venv venv

  2. Now activate the virtual environment:

    $ source venv/bin/activate

  3. Some of the components used by pgAdmin require a very recent version of pip, so update that to the latest:

    $ pip install --upgrade pip

  4. Ensure that a PostgreSQL installation's bin/ directory is in the path (so pg_config can be found for building psycopg2), and install the required packages:

    (venv) $ PATH=$PATH:/usr/local/pgsql/bin pip install -r $PGADMIN4_SRC/requirements.txt

    If you are planning to run the regression tests, you also need to install additional requirements from web/regression/requirements.txt:

    (venv) $ pip install -r $PGADMIN4_SRC/web/regression/requirements.txt

  5. Create a local configuration file for pgAdmin. Edit $PGADMIN4_SRC/web/config_local.py and add any desired configuration options (use the config.py file as a reference - any settings duplicated in config_local.py will override those in config.py). A typical development configuration may look like:

    from config import *

# Debug mode
DEBUG = True

# App mode
SERVER_MODE = True

# Enable the test module
MODULE_BLACKLIST.remove('test')

# Log
CONSOLE_LOG_LEVEL = DEBUG
FILE_LOG_LEVEL = DEBUG

DEFAULT_SERVER = '127.0.0.1'

UPGRADE_CHECK_ENABLED = True

# Use a different config DB for each server mode.
if SERVER_MODE == False:
    SQLITE_PATH = os.path.join(
        DATA_DIR,
        'pgadmin4-desktop.db'
    )
else:
    SQLITE_PATH = os.path.join(
        DATA_DIR,
        'pgadmin4-server.db'
    )

    This configuration allows easy switching between server and desktop modes for testing.

  6. The initial setup of the configuration database is interactive in server mode, and non-interactive in desktop mode. You can run it either by running:

    (venv) $ python3 $PGADMIN4_SRC/web/setup.py

    or by starting pgAdmin 4:

    (venv) $ python3 $PGADMIN4_SRC/web/pgAdmin4.py

    Whilst it is possible to automatically run setup in desktop mode by running the runtime, that will not work in server mode as the runtime doesn't allow command line interaction with the setup program.

At this point you will be able to run pgAdmin 4 from the command line in either server or desktop mode, and access it from a web browser using the URL shown in the terminal once pgAdmin has started up.

Setup of an environment on Windows is somewhat more complicated unfortunately, please see pkg/win32/README.txt for complete details.

Building the Web Assets

pgAdmin is dependent on a number of third party Javascript libraries. These, along with it's own Javascript code, SCSS/CSS code and images must be compiled into a "bundle" which is transferred to the browser for execution and rendering. This is far more efficient than simply requesting each asset as it's needed by the client.

To create the bundle, you will need the 'yarn' package management tool to be installed. Then, you can run the following commands on a *nix system to download the required packages and build the bundle:

(venv) $ cd $PGADMIN4_SRC
(venv) $ make install-node
(venv) $ make bundle

On Windows systems (where "make" is not available), the following commands can be used:

C:\> cd $PGADMIN4_SRC\web
C:\$PGADMIN4_SRC\web> yarn install
C:\$PGADMIN4_SRC\web> yarn run bundle

Creating pgAdmin themes

To create a pgAdmin theme, you need to create a directory under web/pgadmin/static/scss/resources. Copy the sample file _theme.variables.scss.sample to the new directory and rename it to _theme.variables.scss. Change the desired hexadecimal values of the colors and bundle pgAdmin. You can also add a preview image in the theme directory with the name as <dir name>_preview.png. It is recommended that the preview image should not be larger in size as it may take time to load on slow networks. Run the yarn run bundle and you're good to go. No other changes are required, pgAdmin bundle will read the directory and create other required entries to make them available in preferences.

The name of the theme is derived from the directory name. Underscores (_) and hyphens (-) will be replaced with spaces and the result will be camel cased.

Building the documentation

In order to build the docs, an additional Python package is required in the virtual environment. This can be installed with the pip package manager:

$ source venv/bin/activate
(venv) $ pip install Sphinx

The docs can then be built using the Makefile in $PGADMIN4_SRC, e.g.

(venv) $ make docs

The output can be found in $PGADMIN4_SRC/docs/en_US/_build/html/index.html

Building packages

Most packages can be built using the Makefile in $PGADMIN4_SRC, provided all the setup and configuration above has been completed.

To build a source tarball:

(venv) $ make src

To build a PIP Wheel, activate either a Python 3 virtual environment, configured with all the required packages, and then run:

(venv) $ make pip

To build the macOS AppBundle, please see pkg/mac/README.

To build the Windows installer, please see pkg/win32/README.txt.

Create Database Migrations

In order to make changes to the SQLite DB, navigate to the 'web' directory:

(venv) $ cd $PGADMIN4_SRC/web

Create a migration file with the following command:

(venv) $ FLASK_APP=pgAdmin4.py flask db revision

This will create a file in: $PGADMIN4_SRC/web/migrations/versions/ . Add any changes to the 'upgrade' function. Increment the SCHEMA_VERSION in $PGADMIN4_SRC/web/pgadmin/model/init.py file.

There is no need to increment the SETTINGS_SCHEMA_VERSION.

Support

See https://www.pgadmin.org/support/ for support options.

Project info

The source code repository can be found here:

http://git.postgresql.org/gitweb/?p=pgadmin4.git;a=summary

A Redmine project for pgAdmin 4 can be found at the address below. A PostgreSQL community account is required to access this site. Please note that at present only project developers can log bug and feature requests:

https://redmine.postgresql.org/projects/pgadmin4

If you wish to discuss pgAdmin 4, or contribute to the project, please use the pgAdmin Hackers mailing list:

pgadmin-hackers@postgresql.org

CLI Test Suite

There is a test suite for the CLI diffing tool under the test_cli/ directory.

Requirements:

  • python 3.8+
  • docker-compose

Setup

If this is the first time you're working on the project, create and own the subdirectories used by pgadmin4 that require sudo.

sudo mkdir /var/lib/pgadmin
sudo chown -R $USER:$USER /var/lib/pgadmin
sudo mkdir /var/log/pgadmin
sudo chown -R $USER:$USER /var/log/pgadmin

Create a virtual environment and and install dependencies

python -m venv venv
source venv/bin/activate
pip install -U pip wheel setuptools
pip install -r requirements.txt

Run the tests

pytest test_cli

Example output:

============================= test session starts ==============================
platform darwin -- Python 3.8.6, pytest-6.2.5, py-1.10.0, pluggy-1.0.0
rootdir: /Users/wova/Documents/pgadmin4
collected 4 items

test_cli/test_add_table.py .                                             [ 25%]
test_cli/test_empty_db_diff.py .                                         [ 50%]
test_cli/test_engines.py ..                                              [100%]

============================== 4 passed in 27.37s ==============================