Javascript Script Engine

executes Javascript and Coffescript Scripts.

##Note If in the script some modules or functions are used with callbacks or cyclic calls, except setTimeout/setInterval, so they will be called again and again even if the new version of script exists or script is deleted. For example the following script:

    var http = require('http');
    // Read www.google.com page
    http.request('www.google.com', function(res) {
          res.setEncoding('utf8');
          res.on('data', function (chunk) {
            log('BODY: ' + chunk);
          });
    }).on('error', function(e) {
          log('problem with request: ' + e.message, 'error');
    });

was deleted by user before callback returns. The callback will be executed anyway. To fix this feature restart the javascript adapter.

You can use "cb" function to wrap you callback, like this

http.request('www.google.com', cb(function(res) {
      res.setEncoding('utf8');
      res.on('data', function (chunk) {
        log('BODY: ' + chunk);
      }));
}).on('error', cb(function(e) {
      log('problem with request: ' + e.message, 'error');
}));

to be sure, that no callback will be called if script is deleted or modified.

####Best practice: Create two instances of javascript adapter: one "test" and one "production". After the script is tested in the "test" instance, it can be moved to "production". By that you can restart the "test" instance as you want.

##Following functions can be used in scripts:

require - load some module

var mod = require(module_name);

Following modules are pre-loaded: fs, crypto, wake_on_lan, request, suncalc, util, path, os, net, events, dns.

To use other modules go to iobroker/adapter/javascript folder and run in console npm install . After npm successfully finished it can be used in script engine.

Buffer

Buffer - Node.js Buffer, read here http://nodejs.org/api/buffer.html

log - Gives out the message into log

log(msg, sev)

Message is a string and sev is one of the following: 'debug', 'info', 'warn', 'error'. Default severity is 'info'

exec - execute some OS command, like "cp file1 file2"

exec (cmd, callback)

on - Subscribe on changes or updates of some state

on(pattern, callbackOrId, value)

The callback function will return the object as parameter with following content:

    {
        'id' : 'io.state.id',
        'name' : 'state',
        'common' : {
            'def' :    'stop',
            'type' :   'string',
            'read' :   'true',
            'write' :  'true',
            'values' : 'stop,play,pause,next,previous,mute,unmute',
            'role' :   'media.state',
            'desc' :   'Play, stop, or pause, next, previous, mute, unmute',
            'name' :   'state'
        },
        'native' : {},
        'channelId' :   'channelID',
        'channelName' : 'channelName',
        'deviceId' :    'deviceID',
        'deviceName' :  'deviceName',
        'enumIds' : [],
        'enumNames' : [],
        'newState' : {
            'val' :  'new state',
            'ts' :   1416149118,
            'ack' :  true,
            'lc' :   1416149118,
            'from' : 'system.adapter.sonos.0'
        },
        'oldState' : {
            'val' :  'old state',
            'ts' :   1416148233,
            'ack' :  true,
            'lc' :   1416145154,
            'from' : 'system.adapter.sonos.0'
        }
    }

Example:

var timer;

// Create state "javascript.0.counter"
createState('counter', 0);

// On change
on('adapter.0.device.channel.sensor', function (obj) {
    // But not ofter than 30 seconds
    if (!timer) {
        timer = setTimeout(function () {
            timer = null;
        }, 30000);

        // Set acknowledged value
        setState('counter', 1 + getState('counter'), true/*ack*/);
        
        // Or to set unacknowledged command
        setState('adapter.0.device.channel.actor', true);
    }
});

subscribe - same as on

schedule

schedule (pattern, callback)

setState

setState (id, state, callback)

getState

getState (id)

Returns state of id in form {val: value, ack: true/false, ts: timestamp, lc: lastchanged, from: origin}

getObject

getObject (id)

Get description of object id as stored in DB.

createState

createState(name, initialValue, callback)

sendTo:

sendTo (adapter, cmd, msg, callback)

setInterval

setInterval (callback, ms, arg1, arg2, arg3, arg4)

Same as javascript setInterval.

clearInterval

clearInterval (id)

Same as javascript clearInterval.

setTimeout

setTimeout (callback, ms, arg1, arg2, arg3, arg4)

Same as javascript setTimeout.

clearTimeout

 clearTimeout (id)

Same as javascript clearTimeout.

$ - Selector

$(selector).on(function(obj) {});
$(selector).each(function(id, i) {});
$(selector).setState(value, ack);
$(selector).getState();

Format of selector: '''namecommonAttr=something1{nativeName=something3}[id=idfilter][state.id=idfilter]'''

name can be: state, channel or device "idfilter" can have wildcards '*'

Prefixes (not implemented - should be discussed) :

- take by name and not by id

. - filter by role § - filter by room

Example:

• $('state[id=.STATE]') or $('state[state.id=.STATE]') or $('*.STATE') - select all states where id ends with ".STATE".
• $('state[id='hm-rpc.0.]') or $('hm-rpc.0.') - returns all states of adapter instance hm-rpc.0
• $('channel(room=Living room)' - all states in room "Living room"
• $('channel{TYPE=BLIND}[state.id=*.LEVEL]') - Get all shutter of Homematic
• $('channel[role=switch](rooms=Living room)[state.id=*.STATE]').setState(false) - Switch all states with .STATE of channels with role "switch" in "Living room" to false
• $('.switch §"Living room") - Take states with all switches in 'Living room' (not implemented - should be discussed)
• $('channel .switch §"Living room") - Take states with all switches in 'Living room' (not implemented - should be discussed)

*** Explanation *** Lets take a look at:

$('channel[role=switch][state.id=*.STATE](rooms=Wohnzimmer)').on(function (obj) {
   log('New state ' + obj.id + ' = ' + obj.newState.val);
}

This code searches in channels. Find all channels with common.role="switch" and belongs to enum.rooms.Wohnzimmer. Take all their states, where id ends with ".STATE and make subscription on all these states. If some of these states changes the callback will be called like for "on" function.

Following functions are possible, setValue, getValue (only from first), on, each

Changelog

0.1.8 (2015-01-03)

• (bluefox) enable npm install

0.1.7 (2014-12-12)

• (bluefox) check errors if invalid object.

0.1.6 (2014-12-08)

• (bluefox) add some log outputs.

0.1.5 (2014-11-26)

• (bluefox) fix context of all callbacks.

0.1.4 (2014-11-22)

• (bluefox) Support of jquery like selector $. See above for details.

0.1.3 (2014-11-16)

• (bluefox) Support of wrapper "cb" for callbacks in script. (Expert mode)

0.1.2 (2014-11-15)

• (bluefox) support change, delete and add of the scripts without restart of adapter

0.1.1

• (hobbyquaker) fixed typo

0.1.0

• (hobbyquaker) require() in scripts works now
• (hobbyquaker) fixes

0.0.2

• (hobbyquaker) CoffeeScript support
• (hobbyquaker) fixes

0.0.1

• (hobbyquaker) first release

Todo

• $()
• complete patternMatching
• complete eventObj
• global script?