Forked from raphaellondner-mongodb/mongodb-atlas-lambda-step1.js
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August 25, 2017 17:23
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function processEvent(event, context, callback) { | |
const storableEvent = makeEventStorable(event); | |
storableEvent.created_at = new Date(); | |
console.log('Calling MongoDB Atlas from AWS Lambda: ', JSON.stringify(storableEvent)); | |
if (cachedDb) { | |
console.log('- Reusing cached connection'); | |
createDoc(cachedDb, storableEvent, callback); | |
return; | |
} | |
console.log('- Connecting to database'); | |
MongoClient.connect(atlasConnectionUri, (err, db) => { | |
if (err) { | |
console.error('... Error: ', err); | |
callback(err); | |
return; | |
} | |
console.log('... Done'); | |
cachedDb = db; | |
createDoc(cachedDb, storableEvent, callback); | |
}); | |
} | |
function makeEventStorable(event) { | |
const data = {}; | |
Object.keys(event).forEach((key) => { | |
if (key !== 'grades') { | |
data[key] = event[key]; | |
return; | |
} | |
data[key] = event[key].map((grade) => { | |
grade.date = new Date(grade.date); // use real JS dates | |
return grade; | |
}); | |
}); | |
return data; | |
} | |
function createDoc(db, data, done) { | |
console.log('- Creating document'); | |
db.collection('restaurants') | |
.insertOne(data, (err, result) => { | |
if (err) { | |
console.error('... Error: ', err); | |
return done(err); | |
} | |
console.log("... Done", result.insertedId); | |
done(null); // done() should work, but it doesn't in lambda-local (not in master) | |
}); | |
}; |
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