Request and Response Interceptors for Persistance in Node JS V2 SDK

PersistenceInterceptor.js

const RequestPersistenceInterceptor = { 
    process(handlerInput) { 
 
        if(handlerInput.requestEnvelope.session['new']) { 
 
            return new Promise((resolve, reject) => { 
 
                handlerInput.attributesManager.getPersistentAttributes() 
 
                    .then((sessionAttributes) => { 
                        sessionAttributes = sessionAttributes || {}; 
 
 
                        sessionAttributes['launchCount'] += 1; 
 
                        handlerInput.attributesManager.setSessionAttributes(sessionAttributes); 
 
                        handlerInput.attributesManager.savePersistentAttributes() 
                            .then(() => { 
                                resolve(); 
                            }) 
                            .catch((err) => { 
                                reject(err); 
                            }); 
                    }); 
 
            }); 
 
        } // end session['new'] 
    } 
}; 


const ResponsePersistenceInterceptor = { 
    process(handlerInput, responseOutput) { 
 
        const ses = (typeof responseOutput.shouldEndSession == "undefined" ? true : responseOutput.shouldEndSession); 
 
        if(ses || handlerInput.requestEnvelope.request.type == 'SessionEndedRequest') { // skill was stopped or timed out 
 
            let sessionAttributes = handlerInput.attributesManager.getSessionAttributes(); 
 
            sessionAttributes['lastUseTimestamp'] = new Date(handlerInput.requestEnvelope.request.timestamp).getTime(); 
 
            handlerInput.attributesManager.setPersistentAttributes(sessionAttributes); 
 
            return new Promise((resolve, reject) => { 
                handlerInput.attributesManager.savePersistentAttributes() 
                    .then(() => { 
                        resolve(); 
                    }) 
                    .catch((err) => { 
                        reject(err); 
                    }); 
 
            }); 
 
        } 
 
    } 
};