Introduction

SDLR - is simple scheduler on Node.Js. It allows to execute scripts (subsequences of console commands) on a daily basis in chosen time. You can choose between simultaneous execution (async) of commands from scripts or run them in turn (sync). Each script is a file with JSON odject. Each JSON object must contain mandatory properties to be a correct SDLR script. SDLR runs scripts as standalone processes. SDLR doesn't require any third-party modules, databases etc. It saves all data to your filesystem. This is the reason to make sure you run SDLR with write permissions.

Script mandatory properties:

• name - String value containing name for script.
• mode - Is responsible for commands execution method. This property must be a string with possible values: "async" or "sync".
• schedule - Is responsible for commands execution scheduling. This property must be an array of strings in the following format: "hh:mm:ss". "hh" - stands for hours, "mm" - for minutes, "ss" - for seconds. Important! It should be exactly two digits format for timestamps! Keep this array empty if you want to skip execution of your script.
• commands - Is the list of commands. It must be an array of strings, containing console commands.

./scripts - is a project directory for storing scripts files. SDLR checks this dir on each iteration and run scripts accourding their scheduling rules. JSON below is example of how could script look like. .json file extension is not mandatory for scripts, you are free to choose any. However each script file must contain a valid JSON in order to be handled by SDLR.

exampleSync.json:

{
    "name": "Example",
    "mode": "sync",
    "schedule": [
        "16:40",
        "16:41",
        "16:42",
        "16:43",
        "16:44",
        "16:45",
        "16:46",
        "16:47",
        "16:48",
        "16:49"
    ],
    "commands": [
        "wrong",
        "npm --version",
        "node --version",
        "ls -la"
    ]
}

SDLR install

# cd /path/to/projects
# git clone https://github.com/Alex-Kondakov/sdlr.git

SDLR start

SDLR designed to run scripts no more frequently than once a second. You can edit config.js to define interval between scripts checks. The suggestion is to use default or less value to make sure your script would not be skipped.

example.json:

# cd /path/to/projects/sdlr
# npm start

OR

# cd /path/to/projects/sdlr
# node server

The second way saves about 25 MB of RAM