The avatar for @lofwalter
lofwalter
Published
Edited
Jun 26, 2019
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md`# Cost of LiveChat`
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md`# 常量`
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days = 30
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person = 1000
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hours = 12
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sendMessage = 100
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receiveMessage = 100
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messageSize = 3 //3k
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md`## API Gateway`
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function messageCost(messageTotal) { return messageTotal/1000000 * 1.06 } // 前 10 亿： 1.26 超过 10 亿： 1.06 USD
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function connectCost(connectTotal) { return connectTotal/1000000 * 0.315} // 0.315 USD
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md` message cost:`
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messageTotal = (sendMessage + receiveMessage) * 1000 * 30 // 100：条发送消息 500：条接受消息 1000：个人 30：天
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messageCostPrice = messageCost(messageTotal) // USD
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md`connection cost:`
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connectTotal = person * hours * 60 * days // 1000：个人 12: 小时 60：分钟 30： 天
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connectCostPrice = connectCost(connectTotal)
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md`### total cost:`
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TotalCostofAPIGateway = connectCostPrice + messageCostPrice // currently 1.9 USD
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md`## AWS Lamda`
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md`Cost functions:`
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function functionCost(count) { return count/1000000 * 0.2 } // 100 万个请求 0.2 USD
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md`Function count:`
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FUNC_ONCONNECT_COUNT = person * days
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FUNC_DISCONNECT_COUNT = person * days
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FUNC_ONMESSAGE_COUNT = person * receiveMessage * days //接收 100 条
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FUNC_SENDMESSAGE_COUNT = person * sendMessage * days //接收 100 条
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FUNC_PING_COUNT = hours * 60 * 60 / 15 * person * days
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FUNC_GET_OWNER_STATUS_COUNT = person * days
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FUNC_GET_CONTACT_STATUS_COUNT = person * days
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md`total function cost:`
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functionCostPrice = functionCost(FUNC_ONCONNECT_COUNT + FUNC_DISCONNECT_COUNT + FUNC_ONMESSAGE_COUNT + FUNC_SENDMESSAGE_COUNT + FUNC_PING_COUNT +FUNC_GET_OWNER_STATUS_COUNT + FUNC_GET_CONTACT_STATUS_COUNT)
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md`# DynamoDB Cost`
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md`Cost functions:`
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function readWriteCost(writeCount, readCount) {return writeCount/1000000 * 1.4269 + readCount/1000000 * 0.285 } //每百万写入请求单位 1.4269 USD ; 每百万读取请求单位 0.285 USD
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function storageCost(storage) {return storage * 0.285 } //每月存储的前 25 GB 免费 ,之后的部分为每月每 GB 0.285 USD
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md`readWrite cost:`
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readWriteCostPrice = readWriteCost(sendMessage * person * days, person * days)
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md`storage cost:`
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storageCostPrice = storageCost(sendMessage * person * days * messageSize/(1024 * 1024)) //
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md`# Total Cost`
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totalPrice = functionCostPrice + TotalCostofAPIGateway + readWriteCostPrice + storageCostPrice
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