Ethereum: Layer2 returns the error error by calling exactinputsingle in uniswap v3
Hello community overflow,
I am working on the replacement of tokens on the base layer network2 using UNISWAP V3 and ETShers.js. I have successfully approved the transaction using the “approval” function, but recently I found an error that prevents me from doing swap.
The problem occurs when calling “Exactinputsingle” with precise entry parameters, namely, when I call exch.swapexactthetensforthwithrate. This particular case of use caused an error of reverse in Uniswap V3.
background
The UNISWAP V3 provides several features to replace tokens in layer 2. Two of the two of the most common approaches are ‘SwapexacttothensForehand' Exch.SwAPEXACTTHETENS for the beginning '. While both functions allow precise exchange management, they have different sets of parameters and use patterns.
Problem: Singing entry Precise with Uniswap V3
By calling "exactinputsingle, it requires an object with specific parameters that includes:
Supply(Token of quantity at the entrance)
Sumout(Token high at exit)
To(recipient’s address)
In
However, by using “Exactinputsingle”, we must deliver the exact input parameters to avoid possible problems. One of those parameters is “Gasprice”, which determines the price of gas for execution.
In Uniswap V3, I call exch.SWAPEXACTTHETHESFORETHORETRATE with the same input parameters as” Exactinputsingle ‘will cause an error of reverse due to the following reasons:
- This mismatch can lead to an unexpected result, resulting in performance.
- Even if we ignore the previous reason, calling both functions with the same input parameters can still cause problems due to its different use patterns.
Solution
To solve this problem, you must use Exchange.Swapexactthetehwithrate 'when tokens are accurately replaced. Here is an updated code fragment:
JavaScript
Import * as unisswap z '@uniswap/v3-core';
Import {Ethers} of 'ether';
// Determine the price of gas for execution
Const gisprice = new ethers.providers.gaspriceprovider (
Process.env.env.alliance_gas_price,
New Etshers.providers.kilohopprovider ()
);
// Create a UNISWAP instance with the gas price supplier provided
Const unisswap = new unisswap ({{{{
Supplier: New Ether.providers.flexgateway (
New Ethers.providers.Ethereumprovider (Process.env.ethereum_address, Process.env. Alliance_url),
gas,
{
Chain: process.env.chain_id,
},
)
});
// Call exchange function
Uniswap.swapxactthetensForetho -Det (
Tokensin
Tokensout,
Eth.,
[Gasprice],
{Supply: tokensin, sumout: tokensout, to: ethto}
);
When usingExch.SwapexactthetensforEtsForettewith the correct gas price provider and deliver precise entry parameters, you must be able to resolve the error of reverse caused by calling" Exactinputsingle ".
Conclusion
In summary, by replacing tokens exactly in Uniswap v3 using Ethers.js, make sure that instead ofExactinputsingleSump.SwapexacttotthensForethwitrate. This approach will ensure that your exchange is correct and without returned errors. If you still find problems, provide more details about an error message or a specific sketch of the code.
Thanks for pointing out this problem in the original publication!
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