zrb 0.0.17

Your faithful companion

Zrb (WIP)

Your faithful companion.

How to install

pip install zrb

How to use

To run a task, you can invoke the following command:

zrb <task> [arguments]

Autoloaded tasks

Zrb will automatically load the following task definitions:

• Every task definition in ZRB_INIT_SCRIPTS.
  • You can use a colon separator (:) to define multiple scripts in ZRB_INIT_SCRIPTS. For example:

    ZRB_SCRIPTS=~/personal/zrb_init.py:~/work/zrb_init.py
    

• Every task definition in zrb_init.py in your current directory.
  • If Zrb cannot find any in your current directory, it will look at the parent directories until it finds one.
• Every built-in task definition given ZRB_SHOULD_LOAD_BUILTIN equals 1 or unset.

How to define tasks

You can write your task definitions in Python. For example:

from typing import Any
from zrb import (
    runner,
    Env, StrInput,
    Group, Task, CmdTask, HTTPChecker
)


def _concat(*args: str, **kwargs: Any) -> str:
    separator = kwargs.get('separator', ' ')
    return separator.join(args)


'''
Simple Python task to concatenate words
'''
concat = Task(
    name='concat',
    inputs=[StrInput(name='separator', description='Separator', default=' ')],
    runner=_concat
)
runner.register(concat)

'''
Simple CLI task, read input and show output
'''
hello = CmdTask(
    name='hello',
    inputs=[StrInput(name='name', description='Name', default='world')],
    cmd='echo Hello {{input.name}}'
)
runner.register(hello)

'''
A new group: make
'''
make = Group(name='make', description='Make things')

'''
Simple CLI task, part of 'make' group
'''
make_coffee = CmdTask(
    name='coffee',
    group=make,
    upstreams=[hello],
    cmd='echo Coffee for you ☕'
)
runner.register(make_coffee)

'''
Simple CLI task, part of 'make' group
'''
make_beer = CmdTask(
    name='beer',
    group=make,
    upstreams=[hello],
    cmd='echo Cheers 🍺'
)
runner.register(make_beer)

'''
Sub group of 'make'
'''
make_gitignore = Group(
    name='gitignore', description='Make gitignore', parent=make
)

'''
Simple CLI task, part of 'make_gitignore' group.
Having multiline cmd
'''
make_gitignore_python = CmdTask(
    name='node',
    group=make_gitignore,
    cmd=[
        'echo "node_modules/" >> .gitignore'
        'echo ".npm" >> .gitignore'
        'echo "npm-debug.log" >> .gitignore'
    ]
)
runner.register(make_gitignore_python)

'''
Simple CLI task, part of 'make_gitignore' group.
Having multiline cmd
'''
make_gitignore_nodejs = CmdTask(
    name='node',
    group=make_gitignore,
    cmd=[
        'echo "__pycache__/" >> .gitignore'
        'echo "venv" >> .gitignore'
    ]
)
runner.register(make_gitignore_nodejs)

'''
Long running CLI task.
Run a server and waiting for the port to be ready.
'''
start_server = CmdTask(
    name='server',
    upstreams=[make_coffee, make_beer],
    inputs=[StrInput(name='dir', description='Directory', default='.')],
    envs=[Env(name='PORT', os_name='WEB_PORT', default='3000')],
    cmd='python -m http.server $PORT --directory {{input.dir}}',
    checkers=[HTTPChecker(port='{{env.PORT}}')]
)
runner.register(start_server)

'''
A task that depends on start_server and having non-zero exit code.
When this task ended, start_server should be killed as well
'''
test_error = CmdTask(
    name='test-error',
    upstreams=[start_server],
    cmd='sleep 3 && exit 1',
    retry=0
)
runner.register(test_error)

Once registered, your task will be accessible from the terminal.

For example, you can run a server by performing:

export WEB_PORT=8080
zrb start server

The output will be similar to this:

Name [world]: Go Frendi
Dir [.]:
🤖 ➜  2023-02-04T11:08:11.921472 ⚙ 12264 ➤ 1 of 3 • 🍊    show hello • Hello Go Frendi
🤖 ➜  2023-02-04T11:08:12.039529 ⚙ 12266 ➤ 1 of 3 • 🐹   make coffee • Coffee for you ☕
🤖 ➜  2023-02-04T11:08:12.040651 ⚙ 12268 ➤ 1 of 3 • 🐶     make beer • Cheers 🍺
🤖 ➜  2023-02-04T11:08:12.160402 ⚙ 12270 ➤ 1 of 3 • 🍒  start server • Serving HTTP on 0.0.0.0 port 8080 (http://0.0.0.0:8080/) ...
🤖 ➜  2023-02-04T11:08:12.224660 ⚙ 12263 ➤ 1 of 1 • 🍇    http_check • HEAD http://localhost:8080/ 200 (OK)
🤖 🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉
🤖 🍒 start server completed in
🤖 🍒 0.311281681060791 seconds
🤖 🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉

🤖 ⚠  2023-02-04T11:08:12.228542 ⚙ 12270 ➤ 1 of 3 • 🍒  start server • 127.0.0.1 - - [04/Feb/2023 11:08:12] "HEAD / HTTP/1.1" 200 -

How to run tasks programmatically

To run a task programmatically, you need to create a main loop.

For example:

from zrb import CmdTask


cmd_task = CmdTask(
    name='sample',
    cmd='echo hello'
)
main_loop = cmd_task.create_main_loop(env_prefix='')
result = main_loop() # This run the task
print(result.output) # Should be "hello"

Configuration

The following configurations are available:

• ZRB_LOGGING_LEVEL: Logging verbosity.
  • Default: WARNING
  • Possible values:
    • CRITICAL
    • ERROR
    • WARNING
    • WARN (The same as WARNING)
    • INFO
    • DEBUG
    • NOTSET
• ZRB_INIT_SCRIPTS: List of task registration script that should be loaded by default.
  • Default: Empty
  • Possible values: List of script paths, separated by colons(:).
  • Example: ~/personal/zrb_init.py:~/work/zrb_init.py
• ZRB_ENV: Environment prefix that will be used when loading Operating System's environment.
  • Default: Empty
  • Possible values: Any combination of alpha-numeric and underscore
  • Example: DEV
• ZRB_SHOULD_LOAD_BUILTIN: Whether load builtin tasks or not
  • Default: 1
  • Possible values:
    • 1
    • 0
• ZRB_SHELL: Default shell for running cmdTask
  • Default: empty, indicating the system's default (usually /usr/bin/bash or /usr/bin/sh)
  • Possible value:
    • /usr/bin/bash
    • /usr/bin/sh
    • node
    • python

Quirks

• No one is sure how to pronounce Zrb. Let's keep it that way.
• If not set, PYTHONUNBUFFERED will be set to 1.
• Once zrb_init.py is loaded, Zrb will automatically:
  • Set ZRB_PROJECT_DIR to zrb_init.py's parent directory.
  • Adding ZRB_PROJECT_DIR to PYTHONPATH.
• Zrb passes several keyword arguments that will be accessible from the task's run method:
  • _args: Shell argument when the task is invoked.
  • _task: Reference to the current task.
• You can access the built-in command groups by importing zrb.builtin_group.

For contributors

There is a toolkit you can use to test whether Zrb is working as intended.

To use the toolkit, you can invoke the following command:

source ./project.sh

Once you load the toolkit, you can start playing around.

# Run test and serve coverage.
zrb test

# Test zrb in playground
zrb prepare-playground

For maintainers

To publish Zrb, you need a Pypi account:

• Log in or register to https://pypi.org/
• Create an API token

You can also create a TestPypi account:

• Log in or register to https://test.pypi.org/
• Create an API token

Once you have your API token, you need to create a ~/.pypirc file:

[distutils]
index-servers =
   pypi
   testpypi

[pypi]
  repository = https://upload.pypi.org/legacy/
  username = __token__
  password = pypi-xxx-xxx
[testpypi]
  repository = https://test.pypi.org/legacy/
  username = __token__
  password = pypi-xxx-xxx

To publish Zrb, you can do the following:

source ./project.sh

# Publish Zrb to TestPypi
zrb publish-test

# Publish Zrb to Pypi
zrb publish