BancorNetwork

This contract is the main entry point for Bancor token conversions.

It also allows for the conversion of any token in the Bancor Network to any other token in a single

transaction by providing a conversion path.

A note on Conversion Path: Conversion path is a data structure that is used when converting a token

to another token in the Bancor Network, when the conversion cannot necessarily be done by a single

converter and might require multiple 'hops'.

The path defines which converters should be used and what kind of conversion should be done in each step.

The path format doesn't include complex structure; instead, it is represented by a single array

in which each 'hop' is represented by a 2-tuple - converter anchor & target token.

In addition, the first element is always the source token.

The converter anchor is only used as a pointer to a converter (since converter addresses are more

likely to change as opposed to anchor addresses).

Format:

[source token, converter anchor, target token, converter anchor, target token...]

Functions:

Events:

Function constructor(contract IContractRegistry _registry)

initializes a new BancorNetwork instance

Parameters:

  • _registry: address of a contract registry contract

Function conversionPath(contract IReserveToken _sourceToken, contract IReserveToken _targetToken) → address[]

returns the conversion path between two tokens in the network

note that this method is quite expensive in terms of gas and should generally be called off-chain

Parameters:

  • _sourceToken: source reserve token address

  • _targetToken: target reserve token address

Return Values:

  • conversion path between the two tokens

Function rateByPath(address[] _path, uint256 _amount) → uint256

returns the expected target amount of converting a given amount on a given path

note that there is no support for circular paths

Parameters:

  • _path: conversion path (see conversion path format above)

  • _amount: amount of _path[0] tokens received from the sender

Return Values:

  • expected target amount

Function convertByPath2(address[] _path, uint256 _amount, uint256 _minReturn, address payable _beneficiary) → uint256

converts the token to any other token in the bancor network by following

a predefined conversion path and transfers the result tokens to a target account

note that the network should already have been given allowance of the source token (if not ETH)

Parameters:

  • _path: conversion path, see conversion path format above

  • _amount: amount to convert from, in the source token

  • _minReturn: if the conversion results in an amount smaller than the minimum return - it is cancelled, must be greater than zero

  • _beneficiary: account that will receive the conversion result or 0x0 to send the result to the sender account

Return Values:

  • amount of tokens received from the conversion

Function xConvert(address[] _path, uint256 _amount, uint256 _minReturn, bytes32 _targetBlockchain, bytes32 _targetAccount, uint256 _conversionId) → uint256

converts any other token to BNT in the bancor network by following

a predefined conversion path and transfers the result to an account on a different blockchain

note that the network should already have been given allowance of the source token (if not ETH)

Parameters:

  • _path: conversion path, see conversion path format above

  • _amount: amount to convert from, in the source token

  • _minReturn: if the conversion results in an amount smaller than the minimum return - it is cancelled, must be greater than zero

  • _targetBlockchain: blockchain BNT will be issued on

  • _targetAccount: address/account on the target blockchain to send the BNT to

  • _conversionId: pre-determined unique (if non zero) id which refers to this transaction

Return Values:

  • the amount of BNT received from this conversion

Function completeXConversion(address[] _path, contract IBancorX _bancorX, uint256 _conversionId, uint256 _minReturn, address payable _beneficiary) → uint256

allows a user to convert a token that was sent from another blockchain into any other

token on the BancorNetwork

ideally this transaction is created before the previous conversion is even complete, so

so the input amount isn't known at that point - the amount is actually take from the

BancorX contract directly by specifying the conversion id

Parameters:

  • _path: conversion path

  • _bancorX: address of the BancorX contract for the source token

  • _conversionId: pre-determined unique (if non zero) id which refers to this conversion

  • _minReturn: if the conversion results in an amount smaller than the minimum return - it is cancelled, must be nonzero

  • _beneficiary: wallet to receive the conversion result

Return Values:

  • amount of tokens received from the conversion

Function getReturnByPath(address[] _path, uint256 _amount) → uint256, uint256

deprecated, backward compatibility

Function convertByPath(address[] _path, uint256 _amount, uint256 _minReturn, address payable _beneficiary, address, uint256) → uint256

deprecated, backward compatibility

Function convert(address[] _path, uint256 _amount, uint256 _minReturn) → uint256

deprecated, backward compatibility

Function convert2(address[] _path, uint256 _amount, uint256 _minReturn, address, uint256) → uint256

deprecated, backward compatibility

Function convertFor(address[] _path, uint256 _amount, uint256 _minReturn, address payable _beneficiary) → uint256

deprecated, backward compatibility

Function convertFor2(address[] _path, uint256 _amount, uint256 _minReturn, address payable _beneficiary, address, uint256) → uint256

deprecated, backward compatibility

Function claimAndConvert(address[] _path, uint256 _amount, uint256 _minReturn) → uint256

deprecated, backward compatibility

Function claimAndConvert2(address[] _path, uint256 _amount, uint256 _minReturn, address, uint256) → uint256

deprecated, backward compatibility

Function claimAndConvertFor(address[] _path, uint256 _amount, uint256 _minReturn, address payable _beneficiary) → uint256

deprecated, backward compatibility

Function claimAndConvertFor2(address[] _path, uint256 _amount, uint256 _minReturn, address payable _beneficiary, address, uint256) → uint256

deprecated, backward compatibility

Event Conversion(contract IConverterAnchor _smartToken, contract IReserveToken _fromToken, contract IReserveToken _toToken, uint256 _fromAmount, uint256 _toAmount, address _trader)

triggered when a conversion between two tokens occurs

Parameters:

  • _smartToken: anchor governed by the converter

  • _fromToken: source reserve token

  • _toToken: target reserve token

  • _fromAmount: amount converted, in the source token

  • _toAmount: amount returned, minus conversion fee

  • _trader: wallet that initiated the trade

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