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author | Hsuan Lee <hsuan@cobinhood.com> | 2019-01-19 18:42:04 +0800 |
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committer | Hsuan Lee <hsuan@cobinhood.com> | 2019-01-19 18:42:04 +0800 |
commit | 7ae38906926dc09bc10670c361af0d2bf0050426 (patch) | |
tree | 5fb10ae366b987db09e4ddb4bc3ba0f75404ad08 /packages/order-watcher/src/order_watcher/collision_resistant_abi_decoder.ts | |
parent | b5fd3c72a08aaa6957917d74c333387a16edf66b (diff) | |
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Update dependency packages
Diffstat (limited to 'packages/order-watcher/src/order_watcher/collision_resistant_abi_decoder.ts')
-rw-r--r-- | packages/order-watcher/src/order_watcher/collision_resistant_abi_decoder.ts | 54 |
1 files changed, 0 insertions, 54 deletions
diff --git a/packages/order-watcher/src/order_watcher/collision_resistant_abi_decoder.ts b/packages/order-watcher/src/order_watcher/collision_resistant_abi_decoder.ts deleted file mode 100644 index 2ea796947..000000000 --- a/packages/order-watcher/src/order_watcher/collision_resistant_abi_decoder.ts +++ /dev/null @@ -1,54 +0,0 @@ -import { AbiDecoder } from '@0x/utils'; -import { ContractAbi, DecodedLogArgs, LogEntry, LogWithDecodedArgs, RawLog } from 'ethereum-types'; - -const TOKEN_TYPE_COLLISION = `Token can't be marked as ERC20 and ERC721 at the same time`; - -/** - * ERC20 and ERC721 have some events with different args but colliding signature. - * For exmaple: - * Transfer(_from address, _to address, _value uint256) - * Transfer(_from address, _to address, _tokenId uint256) - * Both have the signature: - * Transfer(address,address,uint256) - * - * In order to correctly decode those events we need to know the token type by address in advance. - * You can pass it by calling `this.addERC20Token(address)` or `this.addERC721Token(address)` - */ -export class CollisionResistanceAbiDecoder { - private readonly _erc20AbiDecoder: AbiDecoder; - private readonly _erc721AbiDecoder: AbiDecoder; - private readonly _restAbiDecoder: AbiDecoder; - private readonly _knownERC20Tokens = new Set(); - private readonly _knownERC721Tokens = new Set(); - constructor(erc20Abi: ContractAbi, erc721Abi: ContractAbi, abis: ContractAbi[]) { - this._erc20AbiDecoder = new AbiDecoder([erc20Abi]); - this._erc721AbiDecoder = new AbiDecoder([erc721Abi]); - this._restAbiDecoder = new AbiDecoder(abis); - } - public tryToDecodeLogOrNoop<ArgsType extends DecodedLogArgs>(log: LogEntry): LogWithDecodedArgs<ArgsType> | RawLog { - if (this._knownERC20Tokens.has(log.address)) { - const maybeDecodedERC20Log = this._erc20AbiDecoder.tryToDecodeLogOrNoop(log); - return maybeDecodedERC20Log; - } else if (this._knownERC721Tokens.has(log.address)) { - const maybeDecodedERC721Log = this._erc721AbiDecoder.tryToDecodeLogOrNoop(log); - return maybeDecodedERC721Log; - } else { - const maybeDecodedLog = this._restAbiDecoder.tryToDecodeLogOrNoop(log); - return maybeDecodedLog; - } - } - // Hints the ABI decoder that a particular token address is ERC20 and events from it should be decoded as ERC20 events - public addERC20Token(address: string): void { - if (this._knownERC721Tokens.has(address)) { - throw new Error(TOKEN_TYPE_COLLISION); - } - this._knownERC20Tokens.add(address); - } - // Hints the ABI decoder that a particular token address is ERC721 and events from it should be decoded as ERC721 events - public addERC721Token(address: string): void { - if (this._knownERC20Tokens.has(address)) { - throw new Error(TOKEN_TYPE_COLLISION); - } - this._knownERC721Tokens.add(address); - } -} |