smart-contracts | Main smart contracts for Kyber Network | Cryptocurrency library
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kandi X-RAY | smart-contracts Summary
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Trending Discussions on smart-contracts
QUESTION
What I am trying to do is to parse nested json data into a Java object using Gson and print it out with customized toString().
The Json Content
...ANSWER
Answered 2022-Mar-05 at 16:26The issue is in these lines:
QUESTION
What I am trying to do is to change a certain JSON file into a custom format, and I have been searching for the information for two days but I haven't figured it out and I have no one to ask about this....
Before Formatting
...ANSWER
Answered 2022-Mar-02 at 18:45Don’t use a HashMap. Create real data classes:
QUESTION
I am reading through UniswapV2 docs and can't understand the inputs of addLiquidity
method properly.
As listed in the docs:
amountAMin
(uint): Bounds the extent to which the B/A price can go up before the transaction reverts. Must be <= amountADesired.
amountBMin
(uint): Bounds the extent to which the A/B price can go up before the transaction reverts. Must be <= amountBDesired.
What does it mean? Can you please give an example? Let's say, I set amountADesired
and amountBDesired
to 4 and amountAMin
and amountBMin
to 1. What will happen?
ANSWER
Answered 2022-Feb-10 at 14:01blockchain transactions are not immediate, but must queue before being mined on the blockchain and be effective
When you add liquidity given amountADesired
you have to give it amountBDesired
in proportion to the existing pair (example pair: 2:1 you have to put 2 tokens A and 1 token B)
once you send the transaction, before it is mined it may happen that others make operations on that liquidity pool, changing the proportion accordingly
by entering amountAmin
and amountBmin
you are practically telling him: "as long as the proportion is between amountADesired
:amountBDesired
and amountAMin
:amountBmin
accepts my liquidity addition, if instead the proportion exceeds my range, cancel my transaction"
QUESTION
What does getAmountsOut/getAmountOut and getAmountsIn/getAmountIn exactly do? There isn't an explanation in the Pancakeswap docs, so I'm not sure how could I use it. What's the difference between the two and with the 's' or none?
...ANSWER
Answered 2021-Dec-05 at 20:10The difference is that the one with the "s" return the series of outputs resulting from a path
of swaps. Whereas the ones without the "s" return the output for a single swap.
So if I swap along the path ["ETHUSDT", "USDTUSDC"]
then getAmountsOut
will return the USDT output amount from the ETHUSDT swap and the USDC output amount from the "USDTUSDC" swap. The returned value will look like: [usdtAmount, usdcAmount]
.
If I swap "ETHUSDT" then getAmountOut will return usdtAmount
.
The inverse is true for getAmountsIn/getAmountIn.
It's defined here: https://github.com/pancakeswap/pancake-swap-periphery/blob/master/contracts/libraries/PancakeLibrary.sol#L63
QUESTION
I have a Haskell query
function to get latest token price using
https://coinmarketcap.com/api/documentation/v1/#operation/getV1CryptocurrencyQuotesLatest
The function takes token id as arg, say 2010
for ADA.
ANSWER
Answered 2021-Oct-24 at 16:12I you are completely sure that the object inside "data"
will only ever have a single key, we can take the object, convert it into a list of values, fail if the list is empty or has more than one value, and otherwise continue parsing. Like this:
QUESTION
I am trying to learn how to use the ChainlinkClient and I am using their example as well as one for the API that I am trying to uses.
You can see them here on this Gist.
The two contracts in the Gist are deployed on Rinkenby here:
When I call the requestData() method on both contracts they seems to work, the transactions goes through and Link gets taken from the contracts, I am however unable to determine whether the actual data I am requesting from the external APIs gets returned, either by looking in the transaction event or trying to access the value that I am setting.
I am a bit bamboozled at this point, any guidance or suggestions would be greatly appreciated.
...ANSWER
Answered 2021-Oct-11 at 16:18Thanks for the flag. The node that was hosting this is deprecated, the article has been updated, and the docs have the latest example.
Please use:
QUESTION
I am new to python/coding and I'm seeking some basic help to pull some elements from what I think is a dictionary. So I am executing the below.
...ANSWER
Answered 2021-Apr-07 at 16:35The response basically looks like a list of dicts. So to extract names (or other keys) you can just do a list comprehension:
[d['name'] for d in data_quote]
QUESTION
This answer about upgradability suggests that at some point you should delete access keys to the account containing a smart contract: How do you upgrade NEAR smart contracts?.
It makes sense that a smart contract should be "frozen" at some point, and you want to give its users confidence that it will not be changed. But what about contract rewards and other funds belonging to the contract account? How would the original owner get access to that if keys are deleted?
...ANSWER
Answered 2021-Mar-22 at 13:51But what about contract rewards and other funds belonging to the contract account? How would the original owner get access to that if keys are deleted?
The contract should be implemented in such a way that would allow certain operations.
Let's take a lockup contract as an example. This contract has a single owner, and the funds are locked for a certain amount of time, and the contract only provides certain methods to be called and guarded with the specific logic:
- As an owner, I can delegate (stake) my tokens to staking pools while I still cannot arbitrary transfer the tokens
- As an owner, I can withdraw the rewards from the staking pool through the lockup contract, and transfer those to an arbitrary account
- Once the lockup time is over, as an owner, I can call
add_full_access_key
function, and thus gain full access over the account, and even delete it after that (transferring all the tokens to some other account).
All that is explicitly implemented on the contract level, and easy to review, and given there is no other AccessKey on the lockup contract, we can be sure that there is no other way to interfere with the contract logic.
QUESTION
I want to use web3.py and infura.io to listen for Uniswap factory events however I am not too sure where to go about doing so.
Here is a link: https://uniswap.org/docs/v2/smart-contracts/factory/
More specifically I want to listen for the PairCreated
event.
ANSWER
Answered 2020-Jun-25 at 08:22Here is rough guide
Get ABI for Uniswap contract
Create a web3.py contract object
You can use
web3.eth.getLogs()
to query events over past block rangeYou cannot query all events once, because there are so many events and Infura would time out. Instead you need to query events carefully over a block range slices.
Here is some old code which may or may not work with the latest web3.py versions
https://github.com/TokenMarketNet/sto/blob/master/sto/ethereum/scanner.py#L153
If you want a real time scanner you can listed to events over a WebSocket connection as they happen:
https://web3py.readthedocs.io/en/stable/filters.html#asynchronous-filter-polling
QUESTION
For some TRON contracts i am not able to get ABI. Eg using https://developers.tron.network/reference#smart-contracts for this one:
contract - TQn9Y2khEsLJW1ChVWFMSMeRDow5KcbLSE
...ANSWER
Answered 2020-Oct-20 at 10:57This is a contract created by another contract. So there's no chance for the developer to set an ABI.
You should refer to the creator contract's code.
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