Ch-ch-ch-ch-changes....Stitch Triggers - Andrew Morgan

Ch-ch-ch-ch-changes
Taking Your Stitch Application to the Next Level
with Stitch Triggers

ANDREW MORGAN
Principal Product Marketing
Manager, MongoDB
@andrewmorgan

Agenda
1. Database Triggers
2. RDBMS vs. Stitch Triggers
3. Evolution of computing and App architectures
4. MongoDB Stitch – Serverless Platform
5. Oplog -> Change Streams -> Stitch Triggers
6. MongoDB Swag store demo

Why Triggers
• Propagate changes in real
time to multiple
apps/channels
• Apps act on the changes as
they see fit
• No code changes to original
application
• Simpler development, faster
time to market, lower risk
Legacy
App
Mobile App
Web App
Microservic
e
Cloud
Service

What Are Database Triggers
A database trigger is procedural code that is automatically executed
in response to certain events on a particular table or view in
a database. The trigger is mostly used for maintaining
the integrity of the information on the database. For example, when
a new record (representing a new worker) is added to the employees
table, new records should also be created in the tables of the taxes,
vacations and salaries. Triggers can also be used to log historical
data, for example to keep track of employees' previous salaries.
https://en.wikipedia.org/wiki/Database_trigger

in response to certain events on a particular table or view in
a database.

in response to certain events on a particular collection in a database.

The trigger is mostly used for maintaining the integrity of the
information on the database.

The trigger is partly used for maintaining the integrity of the
information on the database but also for exciting other stuff.

information on the database but also for exciting other stuff. For
example, when a new record (representing a new worker) is added to
the employees table, new records should also be created in the tables
of the taxes, vacations and salaries.

example, when you need a database update from a legacy application
to trigger actions in a new App, or you want to add exciting new
features to an existing app.

example, when you need a database update from a legacy application
to trigger actions in a new App, or you want to add exciting new
features to an existing app. Triggers can also be used to log historical
data, for example to keep track of employees' previous salaries.

RDBMS vs. Stitch Triggers
RDBMS Triggers Stitch Triggers
Runs within/competes for
resources with the database
Runs in our Stitch infrastructure

Used to impose referential Notifications, side effects,
integrating apps

integrating apps
Written in proprietary languages JavaScript (ES6)

integrating apps
Written in proprietary languages JavaScript (ES6)
Invoked before | after DB change Triggers invoked after DB
use Stitch Functions for pre-
change requirements

Large Data Center Virtual Machines VMs in the Cloud (EC2) Containers Serverless
Manage H/W
Complex ops
Manage less H/W
Complex ops
Size & provision VMs
Simpler ops
Size & provision containers
Simpler ops
Just send in requests
Negligible ops
Wasted resources Better utilization Rent, not buy Rent with less waste Pay as you go
Evolution of Computing Models
$$$$ $$$ $$ $

Manage H/W
Complex ops
Manage less H/W
Complex ops
Simpler ops
Simpler ops
Negligible ops
$$$$$ $$$$ $$$ $$ $

Manage H/W
Complex ops
Manage less H/W
Complex ops
Simpler ops
Simpler ops
Negligible ops
$$$$$ $$$$ $$$ $$ $
Evolution to more streamlined, managed
infrastructure– Cheaper to build
– Cheaper to run
– Faster time to market

Frontend vs. Backend (Historical)
• Frontend
• What the user interacts with

• Frontend
• Backend (App Server)
• Does the heavy lifting
• More secure than frontend
• Authentication
• Stores data in MongoDB

Migration of
functionality
• Frontend
• Backend (App Server)
• Does the heavy lifting
• More secure than frontend
• Authentication
• Stores data in MongoDB
But this has changed over
last 10 years with Mobile
First + powerful browsers!

Migration to Cloud Services &
Microservices
• Backend increasingly delegates
essential but generic tasks
• Processing payments
• Authenticating users
• Posting to social media
• Nothing that makes your app unique
• Developers spend less time on
plumbing – better apps, delivered
quicker

Cloud Service & Microservice Integration
• Mundane, repetitive code to
integrate with cloud services &
microservices
• 41% of development time wasted here
• Data access control code

Developers spend even less time
on plumbing code.
Developers focus more on high-
value code that differentiates the
experience delivered by their app.

Streamlines app development with simple, secure access to data and services from the client with thousands of lines less
code to write and no infrastructure to manage – getting your apps to market faster while reducing operational costs.
MongoDB Stitch Serverless Platform
Services
Stitch Triggers
Real-time notifications that
launch functions in response to
changes in the database
Make further database
changes, push data to other
places, or interact with users

Streamlines app development with simple, secure access to data and services from the client with thousands of lines less
code to write and no infrastructure to manage – getting your apps to market faster while reducing operational costs.
Stitch QueryAnywhere Stitch Functions Stitch Mobile Sync (Beta)
MongoDB Stitch Serverless Platform
Services
Stitch Triggers
Real-time notifications that
launch functions in response
to changes in the database
Make further database
changes, push data to other
places, or interact with users

MongoD
B Stitch
MongoD
B Atlas

MongoD
B Stitch
MongAir
Authenticat
e
MongoD
B Atlas
Welcom
e email
Stitch
Triggers

MongoD
B Stitch
Flight Search Flight
Search
MongoD
B Atlas
Stitch
QueryAnywher
e

MongoD
B Atlas
MongoD
B Stitch
Book Flight
Assign
Flight
email
invoice
Stitch
Functions

MongoD
B Stitch
Weather @
destination
Fetch
dest
MongoD
B Atlas
Weather
in
NYC?
Stitch
Functions

MongoD
B Stitch
MongoD
B Atlashttps://mongair.com/agency/findflight?dest=nyc&... db.flights.find({...})
Stitch
Functions

MongoD
B Stitch
Gate
Updated
MongoD
B Atlas
Stitch
Triggers
Text new
gate

Application
W R
PRIMARY SECONDAR
Y
SECONDAR
Y
A
C
K R
What’s an Oplog?

OPLOG
Application
W
R
db.users.insert({,,,})
PRIMARY SECONDAR
Y
SECONDAR
Y
A
C
K R
What’s an Oplog?
OUT OF
DATE
OUT OF
DATE

OPLOGOPLOG OPLOG
Application
R
PRIMARY SECONDAR
Y
SECONDAR
Y
A
C
K
R
What’s an Oplog?

OPLOGOPLOG OPLOG
Application
W
R
PRIMARY SECONDAR
Y
SECONDAR
Y
A
C
K
R
What’s an Oplog?
OUT OF
DATE
OUT OF
DATE

Oplog Format
Field Description
ts
The value for this field is a timestamp, which is a data type supported by BSON that is
ever used for replication.
h The hash field gives each entry a unique identity.
v Version of the oplog format.
op The type of operation. This will be either d (delete), u (update) or i (insert).
ns
The value of the namespace field is the name of the database followed by the name of
collection.
o2
For updates, the value for this field will be the _id of the document being updated. This
won’t exist for insertions or deletions.
o
For updates, this field contains the operation that was performed, whilst for inserts and
deletions, it will be the _id of the document that was operated on.

Responding to Database Changes in the Past
Before Change Streams: Oplog
}
"ts" : Timestamp(1395663575, 1),
"h" : NumberLong("-5862498903080440015"),
"v" : 2,
"op" : "i",
"ns" : ”music.songs",
"o" : {
"_id" : ObjectId("533024470d7e2c31d4443d22"),
"author" : ”David Bowie",
"title" : ”Changes"
}
}

Responding to Database Changes in the Past
Before Change Streams: Oplog
var MongoDB = require('mongodb');
oplogurl = 'mongodb+srv://mike:<PASSWORD>@dotlocaltalk-hhfkg.mongodb.net/test?retryWrites=true’;
MongoDB.MongoClient.connect(oplogurl, function(err, db) {
db.collection("oplog.rs", function(err, oplog) {
oplog.find({}, {
ts: 1
}).sort({
$natural: -1
}).limit(1).toArray(function(err, data) {
lastOplogTime = data[0].ts;
if (lastOplogTime) {
queryForTime = {
$gt: lastOplogTime
};
} else {
tstamp = new MongoDB.Timestamp(0, Math.floor(new Date().getTime() / 1000))
queryForTime = {
$gt: tstamp
};
}
cursor = oplog.find({
ts: queryForTime
}, {
tailable: true,
awaitdata: true,
oplogReplay: true,
numberOfRetries: -1
});
stream = cursor.stream();
stream.on('data', function(oplogdoc) {
console.log(oplogdoc);
});
});
});
})

Setting up a Change Stream (NodeJS)

What is the Swagstore
Standard Retail Store:
• Browse Items
• Add items to cart
• Checkout
• Request Notification for Restock
Additional Features:
• Update/text on item re-stock
• Shipping text/e-mail notification
Stitch Features
• Functions
• Triggers
• 3rd Party Services

Ch-ch-ch-ch-changes....Stitch Triggers - Andrew Morgan

Ch-ch-ch-ch-changes....Stitch Triggers - Andrew Morgan

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