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Websocket API CodeBEAM SF 2020 Building a real time ⋆ ⋆ in Phoenix

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@jwright #CodeBEAMSF

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jamie @brilliantfantastic.com #CodeBEAMSF

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@jwright http://speakerdeck.com/jwright

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Background Some #CodeBEAMSF

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Background Some #CodeBEAMSF

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Background Some #CodeBEAMSF

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Background Some http://chronic.io

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Background Some

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Clients Multiple

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Source One #CodeBEAMSF

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Server is gold copy Source One #CodeBEAMSF

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Server is gold copy Server pushes events to clients Source One #CodeBEAMSF

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Server is gold copy Server pushes events to clients Clients displays event Source One #CodeBEAMSF

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Tick Events at any second #CodeBEAMSF

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Tick { remaining_time: 1497 } { remaining_time: 1497 } #CodeBEAMSF

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Plugins Events at any second #CodeBEAMSF

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Plugins Events at any second  #CodeBEAMSF

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Timers Team { timers: { id: 724 } }

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Timers Team Suzie’s iMac Leon’s MacBook Sandra’s iPhone Sandra’s Slack App { timers: { id: 724 } }

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Background Some Demo #CodeBEAMSF

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Websockets #CodeBEAMSF

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Websocket What’s a #CodeBEAMSF

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Websocket What’s a #CodeBEAMSF

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Websocket What’s a Protocol #CodeBEAMSF

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Websocket #CodeBEAMSF

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Websocket Full-duplex connection #CodeBEAMSF

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Websocket Full-duplex connection Both sides can chat at same time #CodeBEAMSF

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Http #CodeBEAMSF

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Http Simplex connection #CodeBEAMSF

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Http Simplex connection One side can chat at a time #CodeBEAMSF

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Websocket What’s a https://tools.ietf.org/html/rfc6455

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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/

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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

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Websocket What’s a

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Websocket What’s a

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Websocket What’s a #CodeBEAMSF

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Websocket What’s a Starts with a Handshakes via HTTP #CodeBEAMSF

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#CodeBEAMSF

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#CodeBEAMSF

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#CodeBEAMSF

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#CodeBEAMSF

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TCP (C’est une pipe)

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TCP (C’est une pipe) HTTP

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TCP (C’est une pipe) HTTP W ebSocket

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Phoenix Why

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Phoenix Why #CodeBEAMSF

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Phoenix Why WebSockets #CodeBEAMSF

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Phoenix Why #CodeBEAMSF

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Phoenix Why Elixir #CodeBEAMSF

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Phoenix Why #CodeBEAMSF

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Fast Phoenix Why #CodeBEAMSF

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Phoenix Why #CodeBEAMSF

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Phoenix Why Stateful #CodeBEAMSF

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Phoenix Why #CodeBEAMSF

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Phoenix Why Hot Code Reloading #CodeBEAMSF

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Example APIs #CodeBEAMSF

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Example APIs https://api.slack.com/rtm

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Example APIs https://api.slack.com/rtm Send messages in channel

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Example APIs https://api.slack.com/rtm Send messages in channel Receive team events

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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://getstream.io/docs/#realtime

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Example APIs https://getstream.io/docs/#realtime Receive feed changes

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Works How it #CodeBEAMSF

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Authenticating

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Authenticating

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Authenticating

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Authenticating

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Authenticating

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Connecting #CodeBEAMSF

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Connecting

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Connecting

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Connecting

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Connecting

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Connecting #CodeBEAMSF

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Connecting Give clients a starting point #CodeBEAMSF

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Connecting Give clients a starting point Identify events from a single endpoint (client) #CodeBEAMSF

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Connecting Give clients a starting point Identify events from a single endpoint (client) Opportunity to authenticate #CodeBEAMSF

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Connecting

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Connecting

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Connecting

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Connecting

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Connecting

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Connecting

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Connecting

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Connecting

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Connecting

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Connecting

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Connecting

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Channels Joining #CodeBEAMSF

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Channels Joining #CodeBEAMSF

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Channels Joining Custom Protocol #CodeBEAMSF

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Channels Joining #CodeBEAMSF

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Channels Joining Multiplexed #CodeBEAMSF

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Channels Joining #CodeBEAMSF

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Channels Joining PubSub #CodeBEAMSF

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Channels Joining #CodeBEAMSF

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Channels Joining Built In #CodeBEAMSF

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Channels The Problem with #CodeBEAMSF

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Problems WS Joining Channels #CodeBEAMSF

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Problems { topic: “events:1234”, event: “phx_join” } WS WS Joining Channels #CodeBEAMSF

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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 #CodeBEAMSF

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Problems Joining Channels #CodeBEAMSF

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Problems Joining Channels Remove complicated setup from clients #CodeBEAMSF

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Problems Joining Channels Remove complicated setup from clients Build reconnection/ heartbeat logic #CodeBEAMSF

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Problems Joining Channels Remove complicated setup from clients Build reconnection/ heartbeat logic :cowboy_websocket https://bit.ly/2WjtKxZ #CodeBEAMSF

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Messages #CodeBEAMSF

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Messages #CodeBEAMSF

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Messages Meat #CodeBEAMSF

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Messages #CodeBEAMSF

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Messages Event name #CodeBEAMSF

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Messages Event name Event data #CodeBEAMSF

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Messages Incoming #CodeBEAMSF

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Messages Incoming #CodeBEAMSF

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Messages Incoming #CodeBEAMSF

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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 Incoming

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Messages Incoming

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Authenticating

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Authenticating

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Authenticating

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Authenticating

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Authenticating

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Authenticating

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Authenticating

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Messages Incoming #CodeBEAMSF

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Messages Incoming #CodeBEAMSF

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Messages Outgoing #CodeBEAMSF

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Messages Outgoing

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Messages Outgoing

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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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Outgoing

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Outgoing

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Responses Creating #CodeBEAMSF

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Responses Creating

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Responses Creating

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Responses Creating

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Responses Creating

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Responses Creating

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Responses Creating

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without Channels Dispatching #CodeBEAMSF

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without Channels Dispatching

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without Channels Dispatching

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without Channels Dispatching #CodeBEAMSF

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Review #CodeBEAMSF

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Review HTTP Connecting #CodeBEAMSF

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Review POST /graphql HTTP HTTP Connecting { mutation: { connect: { … } } #CodeBEAMSF

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Review POST /graphql { url: “ws://…”, token: “1234” } HTTP HTTP HTTP HTTP Connecting { mutation: { connect: { … } } #CodeBEAMSF

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Review WS Sending Messages #CodeBEAMSF

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Review [“timers:start”, { duration: 1500, timestamp: 1273485 } ] WS WS Sending Messages #CodeBEAMSF

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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 #CodeBEAMSF

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Thank You! #CodeBEAMSF

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Questions? #CodeBEAMSF

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@jwright #CodeBEAMSF