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1//Every Lapp code must have a 'main' function, that accepts following 3 parameters:
2//  * queryString : contains request query string parameters as a JSON object
3//  * body: contains request body as a JSON object
4// ** callback - is a function which you need to call to return response to the API caller.
5//     If you fail to call this, your code will still work but request will be logged as failure.
6
7function main(queryString, body, callback) {
8    //write a simple log
9    ls.log.Info('entering Lapp...');
10    callback(body);
11
12    //pass additional JSON object to log
13    ls.log.Info('body is : ', body);
14
15    //access setting
16    let sampleSetting = ls.SETTINGS.sample_setting;
17
18    //store value in DB
19    ls.db.Put('key1', 'value', function(err, res) {
20        if (err) {
21            ls.log.Error('Error occurred while storing key in DB', err);
22        } else {
23            ls.log.Info('Key-Value stored in DB', res);
24            //now let's try to get this value back from DB
25            ls.db.Get('key1', function(err, res) {
26                if (err) {
27                    ls.log.Error('Error occurred while fetching value from DB', err);
28                } else {
29                    ls.log.Info('Completed Get DB response', res);
30                    let fetchedValue = res.Data.Value;
31                    ls.log.Info('Fetched Value from DB', fetchedValue);
32                }
33            });
34        }
35    });
36
37    //call another function. Please note that ls.db.Put and this next function will execute
38    //asynchronously i.e. anotherFunction will not wait for ls.db.Put to get completed.
39    anotherFunction(sampleSetting, function(error, data) {
40        if (error) {
41            ls.log.Error('something went wrong : ', error);
42            //return error response to API caller
43            callback(error, null);
44        } else {
45            ls.log.Info('function succeeded');
46            //return success response to API caller
47            callback(null, data);
48        }
49    });
50}
51
52function anotherFunction(param, callback) {
53    ls.log.Info('log inside anotherFunction, param : ', param);
54    //return success message with error as null
55    callback(null, 'anotherFunction succeeded');
56}