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remember.js
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remember.js
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/*
/remember is triggered by /listen upon receiving input from Facebook Messenger
checks the package's Cloudant database for any previously stored context for the same sender
if none, creates a record with the userid and empty context
Default Parameters:
cloudant_url
db_name
*/
function main(message) {
var cloudantOrError = getCloudantAccount(message);
if (typeof cloudantOrError !== 'object') {
return Promise.reject(cloudantOrError);
}
var cloudant = cloudantOrError;
var dbName = message.db_name;
var query = {
"selector": {
"userid": message.userid
},
"fields": [
"context"
],
"sort": [
{
"_id": "asc"
}
]
};
if(!dbName) {
return Promise.reject('dbname is required.');
}
if(!query) {
return Promise.reject('query field is required.');
}
var cloudantDb = cloudant.use(dbName);
return queryIndex(cloudantDb, query, message)
}
function queryIndex(cloudantDb, query, message) {
return new Promise(function(resolve, reject) {
cloudantDb.find(query, function(error, response) {
if (!error) {
console.log('success', response);
console.log('here ', response.docs[0])
if (response.docs[0]){
console.log("fetching existing user")
console.log(response)
if (message.attachment){
var new_context = response.docs[0].context
new_context.persona = message.persona
response = {
'userid': message.userid,
'text': message.text,
'attachment': message.attachment,
'context': new_context};
resolve(response);
}
else {
var new_context = response.docs[0].context
new_context.persona = message.persona
response = {
'userid': message.userid,
'text': message.text,
'context': new_context};
resolve(response);
}
}
else {
console.log("inserting new user")
resolve(insert(cloudantDb, query, message))
}
}
else {
console.log('error', error);
reject(error);
}
});
})
}
function insert(cloudantDb, doc, message) {
return new Promise(function(resolve, reject) {
cloudantDb.insert({'userid': message.userid, 'context': {}}, function(error, response) {
if (!error) {
console.log("success", response);
if (message.attachment){
response = {
'userid': message.userid,
'text': message.text,
'attachment': message.attachment,
'context': {
'persona': message.persona
}};
resolve(response);
}
else {
response = {
'userid': message.userid,
'text': message.text,
'context': {
'persona': message.persona
}};
resolve(response);
}
} else {
console.log("error", error);
reject(error);
}
});
});
}
function getCloudantAccount(message) {
// full cloudant URL - Cloudant NPM package has issues creating valid URLs
// when the username contains dashes (common in Bluemix scenarios)
var cloudantUrl = message.cloudant_url
return require('cloudant')({
url: cloudantUrl
});
}