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memorize.js
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memorize.js
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/*
/memorize is triggered by /process upon receiving input from Watson Conversation and resolving any pending actions
stores the returned context in a Cloudant db to be referenced at the next instance of the conversation
the output is passed to /memorize as follows:
{
"userid": userid,
"text": output received from conversation,
"quick_replies": optional quick replies to be sent,
"attachment": optional attachment to be sent
}
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": [
"_rev",
"_id"
],
"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 _rev for user")
console.log(response.docs[0]._rev)
response = {
"_id": response.docs[0]._id,
'_rev': response.docs[0]._rev,
'userid': message.userid,
'context': message.context};
console.log("doc:")
console.log(response)
console.log("directing to update")
resolve(insert(cloudantDb, response, message))
}
else {
console.log("no user with this id")
reject("No user with this id")
}
}
else {
console.log('error', error);
reject(error);
}
});
})
}
function insert(cloudantDb, doc, message) {
return new Promise(function(resolve, reject) {
console.log("attempting update")
cloudantDb.insert(doc, function(error, response) {
if (!error) {
console.log("success", response);
var parameters = {
'userid': message.userid,
'text': message.text,
'quick_replies': message.context.quick_replies,
'attachment': message.attachment
}
resolve(parameters);
} 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
});
}