# SYNOPSIS

Sparky is a flexible and minimalist continuous integration server written in Raku.

![Nice web UI](https://raw.githubusercontent.com/melezhik/sparky/master/images/sparky-web-ui4.png)

The essential features of Sparky:

* Defining builds times in crontab style
* Triggering builds using external APIs and custom logic
* Build scenarios defined as [Sparrow6](https://github.com/melezhik/Sparrow6) scripts
* [Nice set](https://github.com/melezhik/Sparrow6/blob/master/documentation/dsl.md) of predefined tasks is available
* Everything is kept in SCM repository - easy to port, maintain and track changes
* Builds gets run in one of 3 flavors - 1) on localhost 2) on remote machines via **ssh** 3) on **docker** instances
* Nice web UI to read build reports

Interested? Let's go ahead! (:

# Build status

[![Build Status](https://travis-ci.org/melezhik/sparky.svg?branch=master)](https://travis-ci.org/melezhik/sparky)

# Sparky workflow in 4 lines:

```bash
$ sparkyd # run Sparky daemon to build your projects
$ raku bin/sparky-web.raku # run Sparky web UI to see build statuses and reports
$ nano ~/.sparky/projects/my-project/sparrowfile  # write a build scenario
$ firefox 127.0.0.1:3000 # see what's happening
```

# Installation

```bash
$ sudo apt-get install sqlite3
$ git clone https://github.com/melezhik/sparky.git
$ cd sparky && zef install .
```


# Setup

First you should run database initialization script to populate database schema:

```bash
$ raku db-init.raku
```

# Running daemon

Then you need to run (\*) the sparky daemon

```bash
$ sparkyd
```

* Sparky daemon traverses sub directories found at the project root directory.

* For every directory found initiate build process invoking sparky worker ( `sparky-runner.raku` ).

* Sparky root directory default location is `~/.sparky/projects`.

* Once all the sub directories gets passed, sparky daemon sleeps for $timeout seconds.

* A `timeout` option allows to balance a load on your system.

* You can change a timeout by applying `--timeout` parameter when running sparky daemon:

```bash
$ sparkyd --timeout=600 # sleep 10 minutes
```

* You can also set a timeout by using `SPARKY_TIMEOUT` environment variable:

```bash
$ SPARKY_TIMEOUT=30 sparkyd ...
```

Running sparky in demonized mode.

At the moment sparky can't demonize itself, as temporary workaround use linux `nohup` command:

```bash 
$ nohup sparkyd &
```

Or you can use Sparrowdo installer, which install service as systemd unit:

```bash
$ nano utils/install-sparky-web-systemd.raku # change working directory and user
$ sparrowdo --sparrowfile=utils/install-sparkyd-systemd.raku --no_sudo --localhost
```

\* `sparkyd` should be in your PATH, if not, fix it before going further. You should have installed with `zef install .` listed above. It could live for instance in `$HOME/.raku/bin` along with other scripts required (like `sparrowdo`)

# Running Web UI

And finally sparky has simple web UI to show builds statuses and reports.

To run Sparky web UI launch `sparky-web.raku` script from the `bin/` directory:

```bash
$ raku bin/sparky-web.raku
```

This is [Bailador](https://github.com/Bailador/Bailador) application, so you can set any Bailador related options here.

For example:

```bash
$ BAILADOR=host:0.0.0.0,port:5000 raku bin/sparky-web.raku
```

You can use Sparrowdo installer as well, which installs service as systemd unit:

```bash
$ nano utils/install-sparky-web-.raku # change working directory, user and root directory
$ sparrowdo --sparrowfile=utils/install-sparky-web-systemd.raku --no_sudo --localhost
```

# Creating first sparky project

Sparky project is just a directory located at the sparky root directory:

```bash
$ mkdir ~/.sparky/projects/bailador-app
```

# Build scenario

Sparky is built on Sparrowdo, read [Sparrowdo](https://github.com/melezhik/sparrowdo)
_to know how to write Sparky scenarios_.

Here is a short example.

Say, we want to check out a Raku project from from Git, install dependencies and then run unit tests:

```bash
$ nano ~/.sparky/projects/bailador-app/sparrowfile
```

And add content like this:

```raku
directory "project";

git-scm 'https://github.com/melezhik/rakudist-teddy-bear.git', %(
  to => "project",
);

zef "{%*ENV<PWD>}/project", %( depsonly => True );

zef 'TAP::Harness App::Prove6';

bash 'prove6 -l', %(
  debug => True,
  cwd => "{%*ENV<PWD>}/project/"
);
```


# Configure Sparky workers

By default the build scenario gets executed _on the same machine you run Sparky at_, but you can change this
to _any remote host_ setting Sparrowdo related parameters in the `sparky.yaml` file:

```bash
$ nano ~/.sparky/projects/bailador-app/sparky.yaml
```

And define worker configuration:

```yaml
sparrowdo:
  host: '192.168.0.1'
  ssh_private_key: /path/to/ssh_private/key.pem
  ssh_user: sparky
  no_index_update: true
  sync: /tmp/repo
```

You can read about the all [available parameters](https://github.com/melezhik/sparrowdo#sparrowdo-cli) in Sparrowdo documentation.

# Skip bootstrap

Sparrowdo bootstrap takes a while, if you don't need bootstrap ( sparrow client is already installed at a target host )
use `bootstrap: false` option:

```yaml
sparrowdo:
  bootstrap: false
```

# Purging old builds

To remove old build set `keep_builds` parameter in `sparky.yaml`:

```bash
$ nano ~/.sparky/projects/bailador-app/sparky.yaml
```

Put number of past builds to keep:
```yaml
keep_builds: 10
```

That makes Sparky remove old build and only keep last `keep_builds` builds.

# Run by cron

It's possible to setup scheduler for Sparky builds, you should define `crontab` entry in sparky yaml file.
for example to run a build every hour at 30,50 or 55 minute say this:

```bash
$ nano ~/.sparky/projects/bailador-app/sparky.yaml
```

With this schedule:

```cron
crontab: "30,50,55 * * * *"
```

Follow [Time::Crontab](https://github.com/ufobat/p6-time-crontab) documentation on crontab entries format.

# Manual run

If you want to build a project from web UI, use `allow_manual_run`:

```bash
$ nano ~/.sparky/projects/bailador-app/sparky.yaml
```

And activate manual run:
```
allow_manual_run: true
```

# Trigger build by SCM changes

** warning ** - the feature is not properly tested, feel free to post issues or suggestions

To trigger Sparky builds on SCM changes, define `scm` section in `sparky.yaml` file:

```yaml
scm:
  url: $SCM_URL
  branch: $SCM_BRANCH
```

Where:

* `url` - git URL
* `branch` - git branch, optional, default value is `master`

For example:

```yaml
scm:
  url: https://github.com/melezhik/rakudist-teddy-bear.git
  branch: master
```

Once a build is triggered one needs to handle build environment leveraging `tags()<SCM_*>` objects:

```raku
directory "scm";

say "current commit is: {tags()<SCM_SHA>}";

git-scm tags()<SCM_URL>, %(
  to => "scm",
  branch => tags<SCM_BRANCH>
);

bash "ls -l {%*ENV<PWD>}/scm";
```


# Disable project

You can disable project builds by setting `disable` option to true:

```bash
$ nano ~/.sparky/projects/bailador-app/sparky.yaml

disabled: true
```

It's handy when you start a new project and don't want to add it into build pipeline.

# Downstream projects

You can run downstream projects by setting `downstream` field at the upstream project `sparky.yaml` file:

```bash
$ nano ~/.sparky/projects/main/sparky.yaml

downstream: downstream-project
```

# File triggering protocol (FTP)

Sparky FTP allows to _trigger_ builds automatically by just creating files with build _parameters_
in special format:

```bash
$ nano $project/.triggers/foo-bar-baz.pl6
```

File should have a `*.pl6` extension and be located in project `.trigger` directory.

A content of the file should Raku code returning a Hash:

```raku
{
  description => "Build app",
  cwd => "/path/to/working/directory",
  sparrowdo => %(
    localhost => True,
    no_sudo   => True,
    conf      => "/path/to/file.conf"
  )
}
```

Sparky daemon parses files in `.triggers` and launch build per every file, removing file afterwards,
this process is called file triggering.

To separate different builds just create trigger files with unique names inside `$project/.trigger` directory.

FTP allows to create _supplemental_ APIs to implement more complex and custom build logic, while keeping Sparky itself simple.

## Trigger attributes

Those keys could be used in trigger Hash. All they are optional.

* `cwd`
Directory where sparrowfile is located, when a build gets run, the process will change to this directory.

* `description`
Arbitrary text description of build

* `sparrowdo`
Options for sparrowdo run, for example:

```raku
%(
  host  => "foo.bar",
  ssh_user  => "admin",
  tags => "prod,backend"
)
```

Should follow the format of sparky.yaml, `sparrowdo` section

* `key`

A unique key

# Sparky plugins

Sparky plugins are extensions points to add extra functionality to Sparky builds.

These are Raku modules get run _after_ a Sparky project finishes or in other words when a build is completed.

To use Sparky plugins you should:

* Install plugins as Raku modules

* Configure plugins in project's `sparky.yaml` file

## Install Sparky plugins

You should install a module on the same server where you run Sparky at. For instance:

```bash
$ zef install Sparky::Plugin::Email # Sparky plugin to send email notifications
```

## Configure Sparky

In project's `sparky.yaml` file define plugins section, it should be list of Plugins and its configurations.

For instance:

```bash
$ cat sparky.yaml
```

That contains:

```yaml
plugins:
  - Sparky::Plugin::Email:
    parameters:
      subject: "I finished"
      to: "happy@user.email"
      text: "here will be log"
  - Sparky::Plugin::Hello:
    parameters:
      name: Sparrow
```

## Creating Sparky plugins

Technically speaking  Sparky plugins should be just Raku modules.

For instance, for mentioned module Sparky::Plugin::Email we might have this header lines:

```raku
use v6;

unit module Sparky::Plugin::Hello;
```


That is it.

The module should have `run` routine which is invoked when Sparky processes a plugin:

```raku
our sub run ( %config, %parameters ) {

}
```

As we can see the `run` routine consumes its parameters as Raku Hash, these parameters are defined at mentioned `sparky.yaml` file,
at plugin `parameters:` section, so this is how you might handle them:

```raku
sub run ( %config, %parameters ) {

  say "Hello " ~ %parameters<name>;

}
```

You can use `%config` Hash to access Sparky guts:

* `%config<project>`      - the project name
* `%config<build-id>`     - the build number of current project build
* `%cofig<build-state>`   - the state of the current build

For example:

```raku
sub run ( %config, %parameters ) {

  say "build id is: " ~ %parameters<build-id>;

}
```

Alternatively you may pass _some_ predefined parameters plugins:

* %PROJECT% - equivalent of `%config<project>`
* %BUILD-STATE% - equivalent of `%config<build-state>`
* %BUILD-ID% - equivalent of `%config<build-id>`

For example:

```bash
$ cat sparky.yaml
```

That contains:

```yaml
plugins:
  - Sparky::Plugin::Hello:
    parameters:
      name: Sparrow from project %PROJECT%
```

## Limit plugin run scope

You can defined _when_ to run plugin, here are 3 run scopes:

* `anytime` - run plugin irrespective of a build state. This is default value
* `success` - run plugin only if build has succeeded
* `fail`    - run plugin only if build has  failed

Scopes are defined at `run_scope:` parameter:

```yaml
- Sparky::Plugin::Hello:
  run_scope: fail
  parameters:
    name: Sparrow
```


## An example of Sparky plugins

An example Sparky plugins are:

* [Sparky::Plugin::Hello](https://github.com/melezhik/sparky-plugin-hello)
* [Sparky::Plugin::Notify::Email](https://github.com/melezhik/sparky-plugin-notify-email)

# Command line client

You can build the certain project using sparky command client called `sparky-runner.raku`:

```bash
$ sparky-runner.raku --dir=/home/user/.sparky/projects/bailador-app
```

Or just:

```bash
$ cd ~/.sparky/projects/bailador-app && sparky-runner.raku
```

# Sparky runtime parameters

All this parameters could be overridden by command line ( `--root`, `--work-root` )

##  Root directory

This is sparky root directory, or directory where Sparky looks for the projects to get built:

```bash
~/.sparky/projects/
```

##  Work directory

This is working directory where sparky might place some stuff, useless at the moment:

```bash
~/.sparky/work
```

# Environment variables

## SPARKY_SKIP_CRON

You can disable cron check to run project forcefully, by setting `SPARKY_SKIP_CRON` environment variable:

```bash
$ export SPARKY_SKIP_CRON=1 && sparkyd
```

## SPARKY_ROOT

Sets the sparky root directory

## SPARKY_HTTP_ROOT

Set Sparky web application http root. Useful when proxy application through Nginx.

## SPARKY_TIMEOUT

Sets timeout for sparky workers, see [Running daemon](#running-daemon) section.

# Running under other databases engines (MySQL, PostgreSQL)

By default Sparky uses sqlite as database engine, which makes it easy to use when developing.
However sqlite has limitation on transactions locking whole database when doing inserts/updates (Database Is Locked errors).

if you prefer other databases here is guideline.

## Create sparky configuration file

You should defined database engine and connection parameters, say we want to use MySQL:

```bash
$ nano ~/sparky.yaml
```

With content:

```yaml
database:
  engine: mysql
  host: $dbhost
  port: $dbport
  name: $dbname
  user: $dbuser
  pass: $dbpassword
```

For example:

```yaml
database:
  engine: mysql
  host: "127.0.0.1"
  port: 3306
  name: sparky
  user: sparky
  pass: "123"
```

## Installs dependencies

Depending on platform it should be client needed for your database API, for example for Debian we have to:

```bash
$ sudo yum install mysql-client
```

## Creating database user, password and schema

DB init script will generate database schema, provided that user defined and sparky configuration file has access to
the database:

```bash
$ raku db-init.raku
```

That is it, now sparky runs under MySQL!

# Change UI theme

Sparky uses [Bulma](https://bulma.io/) as a CSS framework, you can easily change the theme
through sparky configuration file:

```bash
$ nano ~/sparky.yaml
```

And choose your theme:

```yaml
ui:
  theme: cosmo
```

The list of available themes is on [https://jenil.github.io/bulmaswatch/](https://jenil.github.io/bulmaswatch/)

# Trigger jobs from HTTP API

```
POST /build/project/$project
```

# Examples

You can see examples of sparky scenarios in `examples/` folder.

# See also

[Bailador](https://github.com/Bailador/Bailador) - A light-weight route-based web application framework for Perl 6.
[Sparky-docker](https://github.com/melezhik/sparky-docker) - Run Sparky as Docker container.

# Author

Alexey Melezhik
