Created
January 2, 2023 12:31
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Superfluid Constant Flow Toy Model
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let currentTime = parseInt(Date.now()/1000); // current unix time in seconds | |
class SuperfluidToken { | |
accounts = {}; | |
cfaAgreements = {} | |
_getAccount(owner) { | |
let acc = this.accounts[owner]; | |
if (!acc) { | |
this.accounts[owner] = acc = { | |
settledBalance: 0, | |
settledTime: currentTime, | |
netFlowRate: 0, | |
} | |
} | |
return acc; | |
} | |
balanceOf(owner) { | |
const acc = this.accounts[owner]; | |
if (!acc) return 0; | |
return acc.settledBalance + | |
(currentTime - acc.settledTime) * acc.netFlowRate; | |
} | |
mint(owner, amount) { | |
const acc = this._getAccount(owner); | |
acc.settledBalance += amount; | |
} | |
transfer(sender, receiver, amount) { | |
const senderAcc = this._getAccount(sender); | |
const receiverAcc = this._getAccount(receiver); | |
if (this.balanceOf(sender) < amount) throw new Error("Not enough balance"); | |
senderAcc.settledBalance -= amount; | |
receiverAcc.settledBalance += amount; | |
} | |
updateFlow(sender, receiver, flowRate) { | |
const senderAcc = this._getAccount(sender); | |
const receiverAcc = this._getAccount(receiver); | |
const flowId = sender + ":" + receiver; | |
const flow = this.cfaAgreements[flowId]; | |
if (flow) { | |
flow.updatedAt = currentTime; | |
flow.flowRate = flowRate; | |
} else { | |
this.cfaAgreements[flowId] = { | |
createdAt: currentTime, | |
updatedAt: currentTime, | |
flowRate | |
} | |
} | |
[senderAcc, receiverAcc].map(acc => { | |
acc.settledBalance += (currentTime - acc.settledTime) * acc.netFlowRate; | |
acc.settledTime = currentTime; | |
}); | |
senderAcc.netFlowRate -= flowRate; | |
receiverAcc.netFlowRate += flowRate; | |
} | |
} | |
// Tests | |
function printAccount(token, owner) { | |
console.log(`${owner} balanceOf:${token.balanceOf(owner)}`); | |
} | |
const token = new SuperfluidToken(); | |
console.log("# mint to bob $100"); | |
printAccount(token, "bob"); | |
token.mint("bob", 100); | |
printAccount(token, "bob"); | |
console.log("# transfer $10 from bob to alice"); | |
token.transfer("bob", "alice", 10); | |
printAccount(token, "bob"); | |
printAccount(token, "alice"); | |
console.log("# transfer $100.1 from bob should fail"); | |
try { token.transfer("bob", "alice", 100.1) } catch (err) { console.log("Caught:", err.message); }; | |
console.log("# create flow from bob to alice at $10/hour"); | |
token.updateFlow("bob", "alice", 10/3600); | |
printAccount(token, "bob"); | |
printAccount(token, "alice"); | |
console.log("# advancing for 2 hours..."); | |
currentTime += 3600 *2; | |
printAccount(token, "bob"); | |
printAccount(token, "alice"); | |
console.log("# create flow from alice to carol at $5/hour"); | |
token.updateFlow("alice", "carol", 5/3600); | |
printAccount(token, "bob"); | |
printAccount(token, "alice"); | |
printAccount(token, "carol"); | |
console.log("# advancing for 2 hours..."); | |
currentTime += 3600 *2; | |
printAccount(token, "bob"); | |
printAccount(token, "alice"); | |
printAccount(token, "carol"); |
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