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Websocket API Beer City Code 2019 Building a real time ⋆ ⋆ in Phoenix
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@jwright
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jamie @brilliantfantastic.com
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@jwright http://speakerdeck.com/jwright
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Background Some
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Background Some
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Background Some http://chronic.io
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Background Some
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Background Some
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Background Some Server is gold copy Server pushes events to clients Clients displays event
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Background Some Server triggers push smart notifications
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Background Some Events at any second
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Background Some Demo
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Websockets
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Websocket What’s a
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Websocket What’s a Protocol
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Websocket Full-duplex connection Both sides can chat at same time
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Http Simplex connection One side can chat at a time
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Websocket What’s a https://tools.ietf.org/html/rfc6455 RFC
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Websocket What’s a https://www.w3.org/TR/websockets/ W3C Spec
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Websocket What’s a
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Websocket What’s a Starts with a Handshakes via HTTP
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TCP (C’est une pipe) HTTP W ebSocket
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Websockets Why we chose
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Realtime Websockets Why we chose
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Websockets Why we chose Eventful
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Phoenix Why
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Phoenix Why WebSockets
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Phoenix Why Elixir
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Phoenix Why Stateful
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Fast Phoenix Why
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Example APIs
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Example APIs https://api.slack.com/rtm Send messages in channel Receive team events Receive user presence
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Example APIs https://pusher.com/docs/pusher_protocol Receive system events Receive user presence Trigger client events
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Example APIs https://getstream.io/docs/#realtime Receive feed changes
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Works How it
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Connecting
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Connecting
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Connecting
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Connecting Give clients a starting point Identify events from a single endpoint (client) Opportunity to authenticate
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Connecting
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Connecting
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Connecting
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Channels Joining
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Channels Joining Custom Protocol
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Channels Joining Multiplexed
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Channels Joining PubSub
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Channels Joining Built In
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Channels Joining
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Channels Joining
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Channels Joining
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Channels The Problem with
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Problems { topic: “events:1234”, event: “phx_join” } { topic: “events:1234”, event: “phx_reply”, payload: { ok: true, token: “1234” }}} WS WS WS WS Joining Channels
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Problems Joining Channels Remove complicated setup from clients Build reconnection/ heartbeat logic https://bit.ly/2WjtKxZ
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Messages
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Messages Meat
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Messages Event name Event data
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Messages Incoming
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Messages Incoming
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Messages Incoming
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Messages Incoming
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Messages Incoming
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Messages Outgoing
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Messages Outgoing
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Messages Outgoing
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Outgoing
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Review
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Review POST /graphql { url: “ws://…”, token: “1234” } HTTP HTTP HTTP HTTP Connecting { mutation: { connect: { … } }
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Review [“timers:start”, { duration: 1500, timestamp: 1273485 } ] [“timers:started”, { id: 1234, duration: 1500, remaining_time: 1500, status: “running” } ] WS WS WS WS Sending Messages
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Thank You!
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Questions?
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@jwright