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Revive a Browser Game Server The Open Unlight Project Photo by Artem Labunsky on Unsplash
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WEB DEVELOPER GAME DEVELOPER ࣌ ݭ @elct9620
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Ruby + ActionScript 3
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Adobe Flash IDE is unavailable!
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mxmlc src/Unlight.mxml
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Unlight can be compiled by Flex SDK 3.x
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Failed because missing files
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Setup environment takes much time
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The source code always become dirty
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•Always reset client compile environment •Patches / Rework •Customizable Server/Client •Adjustable Docker compose configure
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Secure Remote Password not matched!
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http://srp.stanford.edu/design.html
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http://srp.stanford.edu/design.html Step 1. Client create PublicKey A
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http://srp.stanford.edu/design.html Step 2. Server create PublicKey B and send it with Salt to user
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http://srp.stanford.edu/design.html Step 3~. Compute SessionKey and verify other's Matcher
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(／‵Д′)／~ ╧╧
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24 Core CPU 24G RAM 98K IOPS SSD 300M/100M FTTH Sponsor by Poka
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Feel "LAG" after 500 online players
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(0.214518s) SELECT * FROM `card_inventories` WHERE ( `card_inventories`. `chara_card_deck_id` = 2971)
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src/model/card_inventory.rb
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ALTER TABLE card_inventories ADD INDEX chara_card_deck_id (chara_card_deck_id)
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About 100x faster
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About 1000 online players without "LAG"
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•Adjust Cpuset to fix database on specify cores •Adjust Swappiness to prevent use disk •Adjust Full Table Index to cache small table
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•Move Database outside Docker •Enable SR-IOV to use physics network card •Add partition to database
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Estimate capability > 3000 online players
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•DAU about 500 online players •Rows grow fast Only two weeks we have 10M ~ 20M rows •1 Developer 1 DevOps 1 Player Support
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But how to hosting this game?
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Add CloudWatch to analytic online players
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Open Unlight's Reword/Customize
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Open Unlight's Allow add customize gems
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Tricks to allow Docker add optional files
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customize/server/src/authentication.rb
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customize/server/src/payment.ru
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Use Rack to implement API server
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Extend CLI to serve in docker
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Hosting a game have to support players resolve problems
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SmartLook can replay player session to debug
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ZenDesk can help players in one central system
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•ZenDesk - Player support •SmartLook - Client Debug (for HTML5) •Asana - Issue Tracking •AWS - CDN/Monitoring •Discord - Co-working
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The HTML5 version?
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Flash will be removed at 2020 in Chrome
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The Unlight client is Flash
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But no one knows CPA will maintenance or not
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From TCPSocket to WebSocket
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Client Server Packet The TCPSocket send packet directly
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Client Server Packet The WebSocket send packet with WebSocket wrapper WebSocket
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Unlight use EventMachine handles connection
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Comment out all EventMachine connection
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Implement a Rack middleware with WebSocket gem
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Add Rack's .ru and it can be served by Puma or Unicorn
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We already migrated 90% server to WebSocket
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How the client communicates with the server?
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It convert data to a command
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Each packet should have a header to describe command
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JavaScript can create 2 byte struct?
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new Int8Array([0x00, 0x03, 0x00, 0x01, 0x00, 0x0a])
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(／‵Д′)／~ ╧╧
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You can learn how the C programmer think by Unlight's Ruby source code
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From Golang to WebAssembly
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func AuthCmd(name string) []byte { buffer := new(bytes.Buffer) binary.Write(buffer, binary.BigEndian, uint16(1)) binary.Write(buffer, binary.BigEndian, []byte(name)) return buffer.Bytes() }
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GOOS=js GOARCH=wasm go build -o libul.go
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Convert Unlight to HTML5 is possible!
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What the next?
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Test! Test! Test!
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We are trying to learn to host a game server as a programmer
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And last ...
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New security problem is coming!
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Thanks