Class: ERC20LiquidityPool

Inherits:
Contract
  • Object
show all
Defined in:
lib/rubysol/contracts/erc20_liquidity_pool.rb

Instance Method Summary collapse

Instance Method Details

#addLiquidity(token0Amount:, token1Amount:) ⇒ Object 



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# File 'lib/rubysol/contracts/erc20_liquidity_pool.rb', line 14

def addLiquidity( token0Amount:, 
                  token1Amount: )
  ERC20(@token0).transferFrom(
    from: msg.sender,
    to: address( this ),   ## note: add support for this (alias for self ??)
    amount: token0Amount
  )
  
  ERC20(@token1).transferFrom(
    from: msg.sender,
    to: address(this),
    amount: token1Amount
  )
end

#calculateOutputAmount(inputToken:, outputToken:, inputAmount:) ⇒ Object 



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# File 'lib/rubysol/contracts/erc20_liquidity_pool.rb', line 41

def calculateOutputAmount( inputToken:,
                           outputToken:,
                           inputAmount: )
  inputReserve  = ERC20(inputToken).balanceOf(address(this))
  outputReserve = ERC20(outputToken).balanceOf(address(this))
  
  ((inputAmount * outputReserve) / (inputReserve + inputAmount)).to_i
end

#constructor(token0:, token1:) ⇒ Object 



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# File 'lib/rubysol/contracts/erc20_liquidity_pool.rb', line 7

def constructor( token0:, 
                 token1: ) 
  @token0 = token0
  @token1 = token1
end

#reserves ⇒ Object 



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# File 'lib/rubysol/contracts/erc20_liquidity_pool.rb', line 31

def reserves
  {
    token0: ERC20(@token0).balanceOf(address(this)),
    token1: ERC20(@token1).balanceOf(address(this))
  }
end

#swap(inputToken:, outputToken:, inputAmount:) ⇒ Object 



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# File 'lib/rubysol/contracts/erc20_liquidity_pool.rb', line 52

def swap(
  inputToken:,
  outputToken:,
  inputAmount: )
  assert [@token0, @token1].include?(inputToken), "Invalid input token"
  assert [@token0, @token1].include?(outputToken), "Invalid output token"
  
  assert inputToken != outputToken, "Input and output tokens can't be the same"
  
  outputAmount = calculateOutputAmount(
    inputToken: inputToken,
    outputToken: outputToken,
    inputAmount: inputAmount
  )
  
  outputReserve = ERC20(outputToken).balanceOf( address(this))
  
  assert outputAmount <= outputReserve, "Insufficient output reserve"

  ERC20(inputToken).transferFrom(
    from: msg.sender,
    to: dumbContractId(this),
    amount: inputAmount
  )

  ERC20(outputToken).transfer(
    msg.sender,
    outputAmount
  )

  outputAmount
end