javascript - function not called in promise -

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i've been looking on answer this, sure must have been asked before, can't seem find 1 makes sense me.

in node i'm creating couple of firebase 'watchers' handles sanitization of data in firebase , send sms when status of parameter changes. in below code i've got startchildchangedwatcher , sendsms function. problem occurs when try call sendsms within promise in bitly.shorten(). never gets executed, although works fine when called outside of promise. i've tried defining var self = this; because thought had scope, , calling self.sendsms(""), no luck. also, 1 of 2 log statements inside promise gets called. i'm sure pretty simple, it's difficult know search when looking similar answers.

ref.authwithcustomtoken(token, function(error, authdata){   if (error) {     console.log(error);   } else {     console.log("login successful");     startchildchangedwatcher();     ...   } });  var startchildchangedwatcher = function() {    deliveriesref.on('child_changed', function(snapshot) {     console.log(snapshot.val());      if (snapshot.val().completed === true) {       if (snapshot.val().urltoshorten !== undefined) {         console.log("image url found, proceeding shorten url");         bitly.shorten(snapshot.val().urltoshorten)         .then(function(response) {           var shorturl = response.data.url;            //this prints fine           console.log('url received, sending sms');           sendsms("your url is: " + shorturl);            //this never prints           console.log("url shortened, proceeding send sms");         }, function(err){           console.log(err)         });       } else {         ...       }     }   }); };  var sendsms = function(message) {   console.log(message);   twilio.sendmessage({     to: +447564908855,     from: +441241797052,     body: message   }, function(err, responsedata) {     if (err) {       console.log("error sending message: " + err);     } else {       console.log("message sent. response: " + responsedata);     }   }); };

i don't think have defined url in code.

sendsms("your url is: " + url); sendsms("your url is: " + shorturl);

ref.authwithcustomtoken(token, function(error, authdata){   if (error) {     console.log(error);   } else {     console.log("login successful");     startchildchangedwatcher();     ...   } });  var startchildchangedwatcher = function() {    deliveriesref.on('child_changed', function(snapshot) {     console.log(snapshot.val());      if (snapshot.val().completed === true) {       if (snapshot.val().urltoshorten !== undefined) {         console.log("image url found, proceeding shorten url");         bitly.shorten(snapshot.val().urltoshorten)         .then(function(response) {           var shorturl = response.data.url;            //this prints fine           console.log('url received, sending sms');           sendsms("your url is: " + url);            //this never prints           console.log("url shortened, proceeding send sms");         }, function(err){           console.log(err)         });       } else {         ...       }     }   }); };  var sendsms = function(message) {   console.log(message);   twilio.sendmessage({     to: +447564908855,     from: +441241797052,     body: message   }, function(err, responsedata) {     if (err) {       console.log("error sending message: " + err);     } else {       console.log("message sent. response: " + responsedata);     }   }); };

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