controller/controller.lua at main · useLiquidOps/controller · GitHub

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local coroutine = require "coroutine"

local bint = require ".bint"(1024)

local utils = require ".utils"

local json = require "json"

local liquidations = {}

local assertions = {}

local scheduler = {}

local oracle = {}

local tokens = {}

local queue = {}

-- oToken module ID

Module = Module or "C6CQfrL29jZ-LYXV2lKn09d3pBIM6adDFwWqh2ICikM"

-- oracle id and tolerance

Oracle = Oracle or "4fVi8P-xSRWxZ0EE0EpltDe8WJJvcD9QyFXMqfk-1UQ"

MaxOracleDelay = MaxOracleDelay or 1200000

-- admin addresses

Owners = Owners or {}

-- liquidops logo tx id

ProtocolLogo = ProtocolLogo or ""

-- holds all the processes that are part of the protocol

-- a member consists of the following fields:

-- - id: string (this is the address of the collateral supported by LiquidOps)

-- - ticker: string (the ticker of the collateral)

-- - oToken: string (the address of the oToken process for the collateral)

-- - denomination: integer (the denomination of the collateral)

---@type Friend[]

Tokens = Tokens or {}

-- queue for operations that change the user's position

---@type { address: string, origin: string }[]

Queue = Queue or {}

-- current timestamp

Timestamp = Timestamp or 0

-- cached auctions (position wallet address, timestamp when discovered)

---@type table<string, number>

Auctions = Auctions or {}

-- maximum and minimum discount that can be applied to a loan in percentages

MaxDiscount = MaxDiscount or 5

MinDiscount = MinDiscount or 1

-- the period till the auction reaches the minimum discount (market price)

DiscountInterval = DiscountInterval or 1000 * 60 * 60 -- 1 hour

PrecisionFactor = 1000000

-- minimum liquidation percentage (a liquidator is required to liquidate at least this percentage of the total loan)

MinLiquidationThreshold = MinLiquidationThreshold or 20

---@alias TokenData { ticker: string, denomination: number }

---@alias PriceParam { ticker: string, quantity: Bint?, denomination: number }

---@alias CollateralBorrow { token: string, ticker: string, quantity: string }

---@alias QualifyingPosition { target: string, depts: CollateralBorrow[], collaterals: CollateralBorrow[], discount: string }

Handlers.add(

"setup-patching",

function () return "continue" end,

function (msg)

ao.send({

device = "patch@1.0",

["token-info"] = { name = "LiquidOps Controller" },

oracle = Oracle,

["discount-config"] = {

min = MinDiscount,

max = MaxDiscount,

interval = DiscountInterval

tokens = Tokens,

queue = Queue,

auctions = Auctions

})

end

)

Handlers.add(

"sync-timestamp",

function () return "continue" end,

function (msg) Timestamp = msg.Timestamp end

)

Handlers.add(

"info",

{ Action = "Info" },

function (msg)

msg.reply({

Name = "LiquidOps Controller",

Module = Module,

Oracle = Oracle,

["Max-Discount"] = tostring(MaxDiscount),

["Min-Discount"] = tostring(MinDiscount),

["Discount-Interval"] = tostring(DiscountInterval),

Data = json.encode(Tokens)

})

end

)

Handlers.add(

"sync-auctions",

Handlers.utils.hasMatchingTagOf("Action", { "Cron", "Get-Liquidations" }),

function (msg)

-- fetch prices first, so the processing of the positions won't be delayed

local rawPrices = oracle.sync()

-- generate position messages

---@type MessageParam[]

local positionMsgs = {}

for _, token in ipairs(Tokens) do

table.insert(positionMsgs, { Target = token.oToken, Action = "Positions" })

end

-- get all user positions

---@type Message[]

local rawPositions = scheduler.schedule(table.unpack(positionMsgs))

-- protocol positions in USD

---@type table<string, { liquidationLimit: Bint, borrowBalance: Bint, debts: CollateralBorrow[], collaterals: CollateralBorrow[] }>

local allPositions = {}

local zero = bint.zero()

-- add positions

for _, market in ipairs(rawPositions) do

---@type boolean, table<string, { Capacity: string, ["Borrow-Balance"]: string, Collateralization: string, ["Liquidation-Limit"]: string }>

local parsed, marketPositions = pcall(json.decode, market.Data)

assert(parsed, "Could not parse market data for " .. market.From)

local ticker = market.Tags["Collateral-Ticker"]

local denomination = tonumber(market.Tags["Collateral-Denomination"]) or 0

local collateral = utils.find(

function (t) return t.oToken == market.From end,

Tokens

)

-- add each position in the market by their usd value

for address, position in pairs(marketPositions) do

local posLiquidationLimit = bint(position["Liquidation-Limit"] or 0)

local posBorrowBalance = bint(position["Borrow-Balance"] or 0)

local hasCollateral = bint.ult(zero, posLiquidationLimit)

local hasLoan = bint.ult(zero, posBorrowBalance)

if hasCollateral or hasLoan then

allPositions[address] = allPositions[address] or {

liquidationLimit = zero,

borrowBalance = zero,

debts = {},

collaterals = {}

}

-- add liquidation limit

if hasCollateral and collateral ~= nil then

allPositions[address].liquidationLimit = allPositions[address].liquidationLimit + oracle.getValue(

rawPrices,

posLiquidationLimit,

ticker,

denomination

)

table.insert(allPositions[address].collaterals, {

token = collateral.id,

ticker = ticker,

quantity = position.Collateralization

})

end

-- add borrow balance

if hasLoan and collateral ~= nil then

allPositions[address].borrowBalance = allPositions[address].borrowBalance + oracle.getValue(

rawPrices,

posBorrowBalance,

ticker,

denomination

)

table.insert(allPositions[address].debts, {

token = collateral.id,

ticker = ticker,

quantity = position["Borrow-Balance"]

})

end

---@type QualifyingPosition[]

local qualifyingPositions = {}

-- now find the positions that can be auctioned

-- and update existing auctions

for address, position in pairs(allPositions) do

-- check if the position can be liquidated

if bint.ult(position.liquidationLimit, position.borrowBalance) then

-- add auction

liquidations.addAuction(address, msg.Timestamp)

-- calculate discount

local discount = tokens.getDiscount(address)

if msg.Tags.Action == "Get-Liquidations" then

table.insert(qualifyingPositions, {

target = address,

debts = position.debts,

collaterals = position.collaterals,

discount = discount

})

end

else

-- remove auction, it is no longer necessary

liquidations.removeAuction(address)

end

if msg.Tags.Action == "Get-Liquidations" then

msg.reply({

Data = json.encode({

liquidations = qualifyingPositions,

tokens = Tokens,

maxDiscount = MaxDiscount,

minDiscount = MinDiscount,

discountInterval = DiscountInterval,

prices = rawPrices,

precisionFactor = PrecisionFactor

})

end

)

-- Verify if the caller of an admin function is

-- authorized to run this action

---@param action string Accepted action

---@return PatternFunction

function assertions.isAdminAction(action)

return function (msg)

if msg.From ~= ao.env.Process.Id and not utils.includes(msg.From, Owners) then

return false

end

return msg.Tags.Action == action

end

Handlers.add(

"list",

assertions.isAdminAction("List"),

function (msg)

-- token to be listed

local token = msg.Tags.Token

assert(

assertions.isAddress(token),

"Invalid token address"

)

assert(

utils.find(function (t) return t.id == token end, Tokens) == nil,

"Token already listed"

)

-- check configuration

local liquidationThreshold = tonumber(msg.Tags["Liquidation-Threshold"])

local collateralFactor = tonumber(msg.Tags["Collateral-Factor"])

local reserveFactor = tonumber(msg.Tags["Reserve-Factor"])

local baseRate = tonumber(msg.Tags["Base-Rate"])

local initRate = tonumber(msg.Tags["Init-Rate"])

local jumpRate = tonumber(msg.Tags["Jump-Rate"])

local cooldownPeriod = tonumber(msg.Tags["Cooldown-Period"])

local kinkParam = tonumber(msg.Tags["Kink-Param"])

assert(

collateralFactor ~= nil and type(collateralFactor) == "number",

"Invalid collateral factor"

)

assert(

collateralFactor // 1 == collateralFactor and collateralFactor >= 0 and collateralFactor <= 100,

"Collateral factor has to be a whole percentage between 0 and 100"

)

assert(

liquidationThreshold ~= nil and type(liquidationThreshold) == "number",

"Invalid liquidation threshold"

)

assert(

liquidationThreshold // 1 == liquidationThreshold and liquidationThreshold >= 0 and liquidationThreshold <= 100,

"Liquidation threshold has to be a whole percentage between 0 and 100"

)

assert(

liquidationThreshold > collateralFactor or liquidationThreshold == 0 and collateralFactor == 0,

"Liquidation threshold must be greater than the collateral factor"

)

assert(

reserveFactor ~= nil and type(reserveFactor) == "number",

"Invalid reserve factor"

)

assert(

reserveFactor // 1 == reserveFactor and reserveFactor >= 0 and reserveFactor <= 100,

"Reserve factor has to be a whole percentage between 0 and 100"

)

assert(

baseRate ~= nil and assertions.isValidNumber(baseRate),

"Invalid base rate"

)

assert(

initRate ~= nil and assertions.isValidNumber(initRate),

"Invalid init rate"

)

assert(

jumpRate ~= nil and assertions.isValidNumber(jumpRate),

"Invalid jump rate"

)

assert(

assertions.isTokenQuantity(msg.Tags["Value-Limit"]),

"Invalid value limit"

)

assert(

cooldownPeriod ~= nil and assertions.isValidInteger(cooldownPeriod),

"Invalid cooldown period"

)

assert(

kinkParam ~= nil and type(kinkParam) == "number",

"Invalid kink parameter"

)

assert(

kinkParam // 1 == kinkParam and kinkParam >= 0 and kinkParam <= 100,

"Kink parameter has to be a whole percentage between 0 and 100"

)

-- check if token is supported

local supported, info = tokens.isSupported(token)

assert(supported, "Token not supported by the protocol")

-- spawn logo

local logo = msg.Tags.Logo or info.Tags.Logo

-- the oToken configuration

local config = {

Name = "LiquidOps " .. tostring(info.Tags.Name or info.Tags.Ticker or ""),

["Collateral-Id"] = token,

["Collateral-Ticker"] = info.Tags.Ticker,

["Collateral-Name"] = info.Tags.Name,

["Collateral-Denomination"] = info.Tags.Denomination,

["Collateral-Factor"] = msg.Tags["Collateral-Factor"],

["Liquidation-Threshold"] = tostring(liquidationThreshold),

["Reserve-Factor"] = tostring(reserveFactor),

["Base-Rate"] = msg.Tags["Base-Rate"],

["Init-Rate"] = msg.Tags["Init-Rate"],

["Jump-Rate"] = msg.Tags["Jump-Rate"],

["Kink-Param"] = msg.Tags["Kink-Param"],

["Value-Limit"] = msg.Tags["Value-Limit"],

["Cooldown-Period"] = msg.Tags["Cooldown-Period"],

Oracle = Oracle,

["Oracle-Delay-Tolerance"] = tostring(MaxOracleDelay),

Logo = logo,

Authority = ao.authorities[1],

Friends = json.encode(Tokens)

}

-- spawn new oToken process

local spawnResult = ao.spawn(Module, config).receive()

local spawnedID = spawnResult.Tags.Process

-- notify all other tokens

for _, t in ipairs(Tokens) do

if t.oToken ~= spawnedID then

ao.send({

Target = t.oToken,

Action = "Add-Friend",

Friend = spawnedID,

Token = token,

Ticker = info.Tags.Ticker,

Denomination = info.Tags.Denomination

})

end

-- add token to tokens list

table.insert(Tokens, {

id = token,

ticker = info.Tags.Ticker,

oToken = spawnedID,

denomination = tonumber(info.Tags.Denomination) or 0

})

msg.reply({

Action = "Token-Listed",

Token = token,

["Spawned-Id"] = spawnedID,

Data = json.encode(config)

})

end

)

Handlers.add(

"unlist",

assertions.isAdminAction("Unlist"),

function (msg)

-- token to be removed

local token = msg.Tags.Token

assert(

assertions.isAddress(token),

"Invalid token address"

)

-- find token index

---@type integer|nil

local idx = utils.find(

function (t) return t.id == token end,

Tokens

)

assert(type(idx) == "number", "Token is not listed")

-- id of the oToken for this token

local oToken = Tokens[idx].oToken

-- unlist

table.remove(Tokens, idx)

-- notify all other oTokens

for _, t in ipairs(Tokens) do

ao.send({

Target = t.oToken,

Action = "Remove-Friend",

Friend = oToken

})

end

msg.reply({

Action = "Token-Unlisted",

Token = token,

["Removed-Id"] = oToken

})

end

)

Handlers.add(

"batch-update",

assertions.isAdminAction("Batch-Update"),

function (msg)

-- check if update is already in progress

assert(not UpdateInProgress, "An update is already in progress")

-- allow skipping oTokens

local skip = msg.Tags.Skip and json.decode(msg.Tags.Skip)

-- generate update msgs

---@type MessageParam[]

local updateMsgs = {}

for _, t in ipairs(Tokens) do

if not skip or utils.includes(t.oToken, skip) then

table.insert(updateMsgs, {

Target = t.oToken,

Action = "Update",

Data = msg.Data

})

end

-- set updating in progress. this will halt interactions

-- by making the queue check always return true for any

-- address

UpdateInProgress = true

-- request updates

---@type Message[]

local updates = scheduler.schedule(table.unpack(updateMsgs))

UpdateInProgress = false

-- filter failed updates

local failed = utils.filter(

---@param res Message

function (res) return res.Tags.Error ~= nil or res.Tags.Updated ~= "true" end,

updates

)

-- reply with results

msg.reply({

Updated = tostring(#Tokens - #failed),

Failed = tostring(#failed),

Data = json.encode(utils.map(

---@param res Message

function (res) return res.From end,

failed

))

})

end

)

Handlers.add(

"get-tokens",

{ Action = "Get-Tokens" },

function (msg)

msg.reply({

Data = json.encode(Tokens)

})

end

)

Handlers.add(

"get-oracle",

{ Action = "Get-Oracle" },

function (msg)

msg.reply({ Oracle = Oracle })

end

)

Handlers.add(

"refund-invalid",

function (msg)

return msg.Tags.Action == "Credit-Notice" and

msg.Tags["X-Action"] ~= "Liquidate"

end,

function (msg)

ao.send({

Target = msg.From,

Action = "Transfer",

Quantity = msg.Tags.Quantity,

Recipient = msg.Tags.Sender,

["X-Action"] = "Refund",

["X-Refund-Reason"] = "This process does not accept the transferred token " .. msg.From

})

end

)

Handlers.add(

"liquidate",

{ Action = "Credit-Notice", ["X-Action"] = "Liquidate" },

function (msg)

-- liquidation target

local target = msg.Tags["X-Target"]

-- liquidator address

local liquidator = msg.Tags.Sender

-- token to be liquidated, currently lent to the target

-- (the token that is paying for the loan = transferred token)

local liquidatedToken = msg.From

-- the token that the liquidator will earn for

-- paying off the loan

-- the user has to have a position in this token

local rewardToken = msg.Tags["X-Reward-Token"]

-- prepare liquidation, check required environment

local success, errorMsg, expectedRewardQty, oTokensParticipating, removeWhenDone = pcall(function ()

assert(

assertions.isAddress(target) and target ~= liquidator,

"Invalid liquidation target"

)

assert(

assertions.isAddress(liquidator),

"Invalid liquidator address"

)

assert(

assertions.isAddress(rewardToken),

"Invalid reward token address"

)

assert(

assertions.isTokenQuantity(msg.Tags.Quantity),

"Invalid transfer quantity"

)

assert(

assertions.isTokenQuantity(msg.Tags["X-Min-Expected-Quantity"]),

"Invalid minimum expected quantity"

)

-- try to find the liquidated token, the reward token and

-- generate the position messages in one loop for efficiency

---@type { liquidated: string; reward: string; }

local oTokensParticipating = {}

---@type MessageParam[]

local positionMsgs = {}

for _, t in ipairs(Tokens) do

if t.id == liquidatedToken then oTokensParticipating.liquidated = t.oToken end

if t.id == rewardToken then oTokensParticipating.reward = t.oToken end

table.insert(positionMsgs, {

Target = t.oToken,

Action = "Position",

Recipient = target

})

end

assert(

oTokensParticipating.liquidated ~= nil,

"Cannot liquidate the incoming token as it is not listed"

)

assert(

oTokensParticipating.reward ~= nil,

"Cannot liquidate for the reward token as it is not listed"

)

-- fetch prices first so the user positions won't be outdated

local prices = oracle.sync()

-- check user position

---@type Message[]

local positions = scheduler.schedule(table.unpack(positionMsgs))

-- check queue

assert(

not queue.isQueued(target),

"User is queued for an operation"

)

-- get tokens that need a price fetch

local zero = bint.zero()

---@type PriceParam[], PriceParam[]

local liquidationLimits, borrowBalances = {}, {}

-- symbols to sync

---@type string[]

local symbols = {}

-- incoming and outgoing token data

---@type TokenData, TokenData

local inTokenData, outTokenData = {}, {}

-- the total collateral of the desired reward token

-- in the user's position for the reward token

local availableRewardQty = zero

-- the total borrow of the liquidated token in the

-- user's position

local availableLiquidateQty = zero

-- check if the user has any open positions (active loans)

local hasOpenPosition = false

-- populate capacities, symbols, incoming/outgoing token data and collateral qty

for _, pos in ipairs(positions) do

local symbol = pos.Tags["Collateral-Ticker"]

local denomination = tonumber(pos.Tags["Collateral-Denomination"]) or 0

-- convert quantities

local liquidationLimit = bint(pos.Tags["Liquidation-Limit"] or 0)

local borrowBalance = bint(pos.Tags["Borrow-Balance"] or 0)

if pos.From == oTokensParticipating.liquidated then

inTokenData = { ticker = symbol, denomination = denomination }

availableLiquidateQty = borrowBalance

end

if pos.From == oTokensParticipating.reward then

outTokenData = { ticker = symbol, denomination = denomination }

availableRewardQty = bint(pos.Tags.Collateralization or 0)

end

-- only sync if there is a position

if bint.ult(zero, borrowBalance) or bint.ult(zero, liquidationLimit) then

table.insert(symbols, symbol)

table.insert(borrowBalances, {

ticker = symbol,

quantity = borrowBalance,

denomination = denomination

})

table.insert(liquidationLimits, {

ticker = symbol,

quantity = liquidationLimit,

denomination = denomination

})

end

-- update user position indicator

if bint.ult(zero, borrowBalance) then

hasOpenPosition = true

end

assert(

inTokenData.ticker ~= nil and inTokenData.denomination ~= nil,

"Incoming token data not found"

)

assert(

outTokenData.ticker ~= nil and outTokenData.denomination ~= nil,

"Outgoing token data not found"

)

assert(

bint.ult(zero, availableRewardQty),

"No available reward quantity"

)

assert(

bint.ult(zero, availableLiquidateQty),

"No available liquidate quantity"

)

-- check if the user has any open positions

if not hasOpenPosition then

-- remove from auctions if present

liquidations.removeAuction(target)

-- error and trigger refund

error("User does not have an active loan")

end

-- ensure "liquidation-limit / borrow-balance < 1"

-- this means that the user is eligible for liquidation

local totalLiquidationLimit = utils.reduce(

function (acc, curr) return acc + curr.value end,

zero,

oracle.getValues(prices, liquidationLimits)

)

local totalBorrowBalance = utils.reduce(

function (acc, curr) return acc + curr.value end,

zero,

oracle.getValues(prices, borrowBalances)

)

assert(

bint.ult(totalLiquidationLimit, totalBorrowBalance),

"Target not eligible for liquidation"

)

-- get token quantities

local inQty = bint(msg.Tags.Quantity)

-- USD value of the liquidation

local usdValue = oracle.getValue(

prices,

inQty,

inTokenData.ticker,

inTokenData.denomination

)

-- ensure that at least the minimum threshold is reached

-- when repaying the loan or the liquidator is repaying the

-- full amount, in case the total value of the loan they're

-- repaying is under 20% of the user's loans' total value

assert(

bint.ule(availableLiquidateQty, inQty) or bint.ule(

bint.udiv(

totalBorrowBalance * bint(MinLiquidationThreshold * 100 // 1),

bint(100 * 100)

usdValue

"Liquidators are required to repay at least " ..

tostring(MinLiquidationThreshold) ..

"% of the total loan or the entire loan of a token"

)

-- market value of the liquidation

local marketValueInQty = oracle.getValueInToken(

{

ticker = inTokenData.ticker,

quantity = inQty,

denomination = inTokenData.denomination

outTokenData,

prices

)

-- make sure that the user's position is enough to pay the liquidator

-- (at least the market value of the tokens)

assert(

bint.ule(marketValueInQty, availableRewardQty),

"The user does not have enough tokens in their position for this liquidation"

)

-- apply auction

local discount = tokens.getDiscount(target)

-- update the expected reward quantity using the discount

local expectedRewardQty = marketValueInQty

if discount > 0 then

expectedRewardQty = bint.udiv(

expectedRewardQty * bint(100 * PrecisionFactor + discount),

bint(100 * PrecisionFactor)

)

end

-- if the discount is higher than the position in the

-- reward token, we need to update it with the maximum

-- possible amount

if bint.ult(availableRewardQty, expectedRewardQty) then

expectedRewardQty = availableRewardQty

end

-- the minimum quantity expected by the user

local minExpectedRewardQty = bint(msg.Tags["X-Min-Expected-Quantity"] or 0)

-- make sure the user is receiving at least

-- the minimum amount of tokens they're expecting

assert(

bint.ule(minExpectedRewardQty, expectedRewardQty),

"Could not meet the defined slippage"

)

-- check queue

assert(

not queue.isQueued(target),

"User is already queued for liquidation"

)

-- whether or not to remove the auction after this liquidation is complete.

-- this checks if the position becomes healthy after the liquidation

local removeWhenDone = bint.ule(

totalBorrowBalance - oracle.getValue(prices, bint.min(inQty, availableLiquidateQty), inTokenData.ticker, inTokenData.denomination),

totalLiquidationLimit - oracle.getValue(prices, expectedRewardQty, outTokenData.ticker, outTokenData.denomination)

)

return "", expectedRewardQty, oTokensParticipating, removeWhenDone

end)

-- check if liquidation is possible

if not success then

-- signal error

ao.send({

Target = liquidator,

Action = "Liquidate-Error",

Error = string.gsub(errorMsg, "%[[%w_.\" ]*%]:%d*: ", "")

})

-- refund

return ao.send({

Target = msg.From,

Action = "Transfer",

Quantity = msg.Tags.Quantity,

Recipient = liquidator

})

end

-- since a liquidation is possible for the target

-- we add it to the list of discovered auctions

liquidations.addAuction(target, msg.Timestamp)

-- queue the liquidation at this point, because

-- the user position has been checked, so the liquidation is valid

-- we don't want anyone to be able to liquidate from this point

queue.add(target, ao.id)

-- TODO: timeout here? (what if this doesn't return in time, the liquidation remains in a pending state)

-- TODO: this timeout can be done with a Handler that removed this coroutine

-- liquidation reference to identify the result

-- (we cannot use .receive() here, since both the target

-- and the default response reference will change, because

-- of the chained messages)

local liquidationReference = msg.Id .. "-" .. liquidator

-- liquidate the loan

ao.send({

Target = liquidatedToken,

Action = "Transfer",

Quantity = msg.Tags.Quantity,

Recipient = oTokensParticipating.liquidated,

["X-Action"] = "Liquidate-Borrow",

["X-Liquidator"] = liquidator,

["X-Liquidation-Target"] = target,

["X-Reward-Market"] = oTokensParticipating.reward,

["X-Reward-Quantity"] = tostring(expectedRewardQty),

["X-Liquidation-Reference"] = liquidationReference

})

-- wait for result

local loanLiquidationRes = Handlers.receive({

From = oTokensParticipating.liquidated,

["Liquidation-Reference"] = liquidationReference

})

-- remove from queue (discard result - if we get to this point, the user should be queued by the controller)

queue.remove(target, ao.id)

-- check loan liquidation result

-- (at this point, we do not need to refund the user

-- because the oToken process handles that)

if loanLiquidationRes.Tags.Error or loanLiquidationRes.Tags.Action ~= "Liquidate-Borrow-Confirmation" then

return ao.send({

Target = liquidator,

Action = "Liquidate-Error",

Error = loanLiquidationRes.Tags.Error

})

end

-- if the auction is done (no more loans to liquidate)

-- we need to remove it from the discovered auctions

if removeWhenDone then

liquidations.removeAuction(target)

end

-- send confirmation to the liquidator

ao.send({

Target = liquidator,

Action = "Liquidate-Confirmation",

["Liquidation-Target"] = target,

["From-Quantity"] = msg.Tags.Quantity,

["From-Token"] = liquidatedToken,

["To-Quantity"] = tostring(expectedRewardQty),

["To-Token"] = rewardToken

})

-- send notice to the target

ao.send({

Target = target,

Action = "Liquidate-Notice",

["From-Quantity"] = msg.Tags.Quantity,

["To-Quantity"] = tostring(expectedRewardQty)

})

end

)

Handlers.add(

"add-queue",

function (msg)

if msg.Action ~= "Add-To-Queue" then return false end

return utils.find(

function (t) return t.oToken == msg.From end,

Tokens

) ~= nil

end,

function (msg)

local user = msg.Tags.User

-- validate address

if not assertions.isAddress(user) then

return msg.reply({ Error = "Invalid user address" })

end

-- check if the user has already been added

if queue.isQueued(user) or UpdateInProgress then

return msg.reply({ Error = "User already queued" })

end

-- add to queue

queue.add(user, msg.From)

msg.reply({ ["Queued-User"] = user })

end

)

Handlers.add(

"remove-queue",

function (msg)

if msg.Action ~= "Remove-From-Queue" then return false end

return utils.find(

function (t) return t.oToken == msg.From end,

Tokens

) ~= nil

end,

function (msg)

local user = msg.Tags.User

-- validate address

if not assertions.isAddress(user) then

return msg.reply({ Error = "Invalid user address" })

end

-- try to remove the user from the queue

local res = queue.remove(user, msg.From)

if res ~= "removed" then

return msg.reply({

Error = res == "not_queued" and

"The user is not queued" or

"The user was queued from another origin"

})

end

-- reply with confirmation

msg.reply({ ["Unqueued-User"] = user })

end

)

Handlers.add(

"check-queue",

{ Action = "Check-Queue-For" },

function (msg)

local user = msg.Tags.User

-- validate address

if not assertions.isAddress(user) then

return msg.reply({ ["In-Queue"] = "false" })

end

-- the user is queued if they're either in the collateral

-- or the liquidation queues

return msg.reply({

["In-Queue"] = json.encode(queue.isQueued(user) or UpdateInProgress)

})

end

)

Handlers.add(

"get-auctions",

{ Action = "Get-Auctions" },

function (msg)

msg.reply({

["Initial-Discount"] = tostring(MaxDiscount),

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