Contract-Invocation
我如何直接從 sbt-ethereum 在 uniswap 中將 ETH 換成 DAI？
首先，我愛
sbt-ethereum。這是活潑的，絕對的樂趣。完成本教程的合約互動部分後，我想測試一個實時合約。我想直接與 uniswap.io ETH-DAI-exchange 合約互動
sbt-ethereum以獲得 2 DAI。
- 我通過在etherscan
dai-token上滾動找到了地址- 然後使用Uniswap 文件獲取
uniswap-factory合約地址- 叫
ethTransactionView uniswap-factory getExchange dai-token- 這返回了
uniswap-dai-exchange地址 (0x09cabec1ead1c0ba254b09efb3ee13841712be14)- 我驗證了etherscan 上的 Contract ABI 與github 版本匹配
- 然後我嘗試用 5 分鐘的計時器獲得 2 DAI。輸入參數的不同組合（參見 A 到 E），包括一些帶有
[ETH to pay, optional]欄位的組合，都因相同的錯誤而失敗。- 我檢查了dai合約，似乎是18位小數，所以我將DAI輸入更改為2e18。我嘗試了乙太幣和芬尼面額的可選支付。我還嘗試了 ethToTokenSwapInput，指定了 ETH 的數量而不是 DAI，同樣的結果。
$$ error $$com.mchange.sc.v2.jsonrpc.package$JsonrpcException：所需的氣體超過限額或交易總是失敗$$ code=-32000 $$: 沒有更多資訊
我確信這是我正在做的簡單的事情。發送錢包的資金來自價值超過 5 DAI 的 ETH。
有任何想法嗎？
注意：我無法按預期
sbt-ethereum創建新標籤，因為信譽 <150。A：
ethTransactionInvoke uniswap-dai-exchange ethToTokenSwapOutput 2 300乙：
ethTransactionInvoke uniswap-dai-exchange ethToTokenSwapOutput 2 300 15 finneyC：
ethTransactionInvoke uniswap-dai-exchange ethToTokenSwapOutput 2000000000000000000 300丁：
ethTransactionInvoke uniswap-dai-exchange ethToTokenSwapOutput 2000000000000000000 300 15 finney和：
ethTransactionInvoke uniswap-dai-exchange ethToTokenSwapOutput 2000000000000000000 300 0.015 ether
首先，非常感謝您嘗試
sbt-ethereum（並且喜歡它！）。我能夠我認為使您想做的交易工作。有兩個問題：
- 正如@Ismael 所說，截止日期應該是一個unix時間戳。（鑑於這些的普遍性，我可能應該添加一個實用程序來輕鬆計算它們
sbt-ethereum。）- 您正在呼叫的函式已標記為
@payable，並且確實需要您支付您願意為交換提供的乙太幣數量。我突然想到本sbt-ethereum教程並沒有過多強調這一點，但是在呼叫payable函式時，在提供函式參數後，您可以提供您希望支付的金額作為數字和單位。（**更新：**我看到你已經註意到並嘗試了這個！所以這主要是最後期限。）另一個問題是 DAI 小數點是 18，所以如果我們只想要 2 個 DAI 代幣，我們想要 2 加上很多零。（裡面的
uint解析器sbt-ethereum不支持科學記數法，還有一件事要補救！）所以，當一切都說完了，我們有…
> ethTransactionInvoke unverified-uniswap-dai-exchange ethToTokenSwapOutput 2000000000000000000 1557109479 0.015 ether [info] Unlocking address '0x465e79b940bc2157e4259ff6b2d92f454497f1e4' (on chain with ID 1, aliases ['default-sender','testing0']) Enter passphrase or hex private key for address '0x465e79b940bc2157e4259ff6b2d92f454497f1e4': ******************* [info] V3 wallet(s) found for '0x465e79b940bc2157e4259ff6b2d92f454497f1e4' (aliases ['default-sender','testing0']) ==> T R A N S A C T I O N S U B M I S S I O N R E Q U E S T ==> ==> The transaction would be a message with... ==> To: 0x09cabec1ead1c0ba254b09efb3ee13841712be14 (with aliases ['unverified-uniswap-dai-exchange'] on chain with ID 1) ==> From: 0x465e79b940bc2157e4259ff6b2d92f454497f1e4 (with aliases ['default-sender','testing0'] on chain with ID 1) ==> Data: 0x6b1d4db70000000000000000000000000000000000000000000000001bc16d674ec80000000000000000000000000000000000000000000000000000000000005ccf9ae7 ==> Value: 0.015 Ether ==> ==> The transaction is signed with Chain ID 1 (which correctly matches the current session's 'ethNodeChainId'). ==> ==> According to the ABI currently associated with the 'to' address, this message would amount to the following method call... ==> Function called: ethToTokenSwapOutput(uint256,uint256) ==> Arg 1 [name=tokens_bought, type=uint256]: 2000000000000000000 ==> Arg 2 [name=deadline, type=uint256]: 1557109479 ==> ==> The nonce of the transaction would be 407. ==> ==> $$$ The transaction you have requested could use up to 66235 units of gas. ==> $$$ You would pay 3 gwei for each unit of gas, for a maximum cost of 0.000198705 ether. ==> $$$ This is worth 0.031652712975 USD (according to Coinbase at 7:20 PM). ==> $$$ You would also send 0.015 ether (2.389425 USD), for a maximum total cost of 0.015198705 ether (2.421077712975 USD). Would you like to submit this transaction? [y/n] y A transaction with hash '0x0509bafc336c760f21e6c7a1c491d7ba86a6c17c18ec46eec8d87d4995afd8e6' will be submitted. Please wait. [info] Called function 'ethToTokenSwapOutput', with args '2000000000000000000, 1557109479', sending 15000000000000000 wei to address '0x09cabec1ead1c0ba254b09efb3ee13841712be14' in transaction '0x0509bafc336c760f21e6c7a1c491d7ba86a6c17c18ec46eec8d87d4995afd8e6'. [info] Waiting for the transaction to be mined (will wait up to 5 minutes). [info] Transaction Receipt: [info] Transaction Hash: 0x0509bafc336c760f21e6c7a1c491d7ba86a6c17c18ec46eec8d87d4995afd8e6 [info] Transaction Index: 122 [info] Transaction Status: SUCCEEDED [info] Block Hash: 0x3257d8fd31b49c2c7d55d72c0fddd01f02b92a3326529ed903fdd0e6cb520f9d [info] Block Number: 7704627 [info] From: 0x465e79b940bc2157e4259ff6b2d92f454497f1e4 [info] To: 0x09cabec1ead1c0ba254b09efb3ee13841712be14 [info] Cumulative Gas Used: 6482478 [info] Gas Used: 54719 [info] Contract Address: None [info] Logs: 0 => EthLogEntry [source=0x89d24a6b4ccb1b6faa2625fe562bdd9a23260359] ( [info] topics=[ [info] 0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef, [info] 0x00000000000000000000000009cabec1ead1c0ba254b09efb3ee13841712be14, [info] 0x000000000000000000000000465e79b940bc2157e4259ff6b2d92f454497f1e4 [info] ], [info] data=0000000000000000000000000000000000000000000000001bc16d674ec80000 [info] ), [info] 1 => EthLogEntry [source=0x09cabec1ead1c0ba254b09efb3ee13841712be14] ( [info] topics=[ [info] 0xcd60aa75dea3072fbc07ae6d7d856b5dc5f4eee88854f5b4abf7b680ef8bc50f, [info] 0x000000000000000000000000465e79b940bc2157e4259ff6b2d92f454497f1e4, [info] 0x000000000000000000000000000000000000000000000000002c13f43dbb6c42, [info] 0x0000000000000000000000000000000000000000000000001bc16d674ec80000 [info] ], [info] data= [info] ) [info] Events: 0 => Transfer [source=0x89d24a6b4ccb1b6faa2625fe562bdd9a23260359] ( [info] _from (of type address): 0x09cabec1ead1c0ba254b09efb3ee13841712be14, [info] _to (of type address): 0x465e79b940bc2157e4259ff6b2d92f454497f1e4, [info] _value (of type uint256): 2000000000000000000 [info] ), [info] 1 => TokenPurchase [source=0x09cabec1ead1c0ba254b09efb3ee13841712be14] ( [info] buyer (of type address): 0x465e79b940bc2157e4259ff6b2d92f454497f1e4, [info] eth_sold (of type uint256): 12406838703909954, [info] tokens_bought (of type uint256): 2000000000000000000 [info] ) [success] Total time: 37 s, completed May 5, 2019 7:20:27 PM sbt:ethdocstore> ethTransactionView 0x89d24a6b4ccb1b6faa2625fe562bdd9a23260359 balanceOf testing0 [info] The function 'balanceOf' yields 1 result. [info] + Result 1 of type 'uint256', named 'balance', is 2000000000000000002 [success] Total time: 1 s, completed May 5, 2019 7:26:36 PM帳戶餘額末尾的額外 2 個原子是由於我最初嘗試沒有所有這些額外的零。
您可以查看您是否查看了成功的交易，對於我發送的 2 DAI
0.015 ether，但（在“內部交易”中）0.002593161296090046 ether作為零錢回來了。再次感謝您
sbt-ethereum試一試。我希望這有幫助！ps 如果您想按
sbt-ethereum原樣計算 300 秒（5 分鐘）截止日期的 UNIX 時間戳，您可以這樣做。> consoleQuick [info] Starting scala interpreter... Welcome to Scala 2.12.7 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_172). Type in expressions for evaluation. Or try :help. scala> (System.currentTimeMillis / 1000) + 300 res0: Long = 1557110378 scala>不過，顯然最好不要進入 Scala REPL 來執行此操作。