Questions tagged [smartpy]

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6
votes
4answers
222 views

Ethereum/Solidity dev here, looking to migrate some Solidity contracts onto Tezos. Was hoping to have some light shed on a few questions

Was hoping to have some light shed on a few questions. Narrowing in on using Ligo, Archetype, or Liquidity. Is Liquidity kind of a dead-end right now? I noticed it's not listed on developeres.tezos....
5
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2answers
101 views

How do I get a list of a Tezos smart contract KT1 address entrypoints and its parameters?

I wish to retrieve info from a KT1 address so I know which entrypoints are available for consuming and which are their parameters and types. How can I achieve this? Thanks in advance.
5
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1answer
44 views

bigmap.get(key, “”) with default param in case of no entry for key in the map with Taquito

Can we do something similar to myMap.get(key, defaultValue = None) of smartPy with Taquito? An instruction like: const myContract = await Tezos.contract.at(contractAddress); const contractStorage = ...
4
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1answer
94 views

Calling view of Fa1.2 contract

From my understanding, getBalance, getAllowance, getTotalSupply & getAdministrator entrypoint requires another contract to read the values. How will the entry point of the second contract look ...
3
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4answers
91 views

Is it possible to use natural logarithmic in your smartpy code?

If not,is there any alternative way to implement a natural log component into your smart contract code?
3
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3answers
82 views

How to delegate the balance of a smart contract?

I am looking to create a smart contact that will delegate the funds it is storing. 1) How does an originated KT address delegate to a baker? 2) If a KT address delegates, can it do anything else? I ...
2
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2answers
208 views

How to retrieve data from smart-contract using javascript?

I have stored data that I would like to retrieve from a deployed smart-contract. The storage structure was defined using SmartPy: def __init__(self): self.init(bmap=sp.big_map(tkey=sp....
2
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1answer
84 views

Why does smartpy use sp.for/sp.while instead of the default loops provided by python?

So I just started out with smartpy and I am kinda confused about the point of having separate expression for loops. My understanding is that it is may be because it's a part of on-chain computations, ...
2
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4answers
85 views

Is there a formula to build parameter messages to be passed to smart contract entrypoints?

When calling a smart contract entrypoint, it is required to pass the needed entrypoint parameters. This is done through a message that must be sent in JSON/Pairs format. My doubt is: Is there a ...
2
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1answer
45 views

How to create a mapping in smartpy ? Do we need to define the datatypes of the key & value like in solidity?

Want to implement mappings like this in smartpy : // Mapping from token ID to owner mapping (uint256 => address) private _tokenOwner; // Mapping from token ID to approved address mapping (...
2
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1answer
73 views

How to get a contract storage data from another contract in smartPy?

I'm trying to access a storage data of a contract from another one using the continuous passing style in smartPy. import smartpy as sp class XXIFA12(sp.Contract): def __init__(self, admin): ...
2
votes
1answer
179 views

How to deploy a smart contract influenced by UI inputs using ConseilJS and SmartPy generated Michelson?

I wish to be able to create a smart contract taking input from a UI to supply parameters pubKey,prvKey,pubHash for the deployment and minAmount and maxTime to influence the Michelson. I have the ...
2
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1answer
48 views

How should a contract check whether an address owns a FA2 token created in another contract?

I've broken up my code into 2 contracts. FA2 contract and other one managing its data and providing additional functionality on top. This is to not overload a single contract, however, it does ...
2
votes
1answer
65 views

Is there a list of public repos using smartpy?

I'd like to see more complex examples of smartpy being used in main net contracts. So far, I've found tzcolor's auction house contract SUPER helpful. Are there any other really good examples (that are ...
2
votes
1answer
27 views

Why aren't the offchain views appearing?

I'm extending the smartpy FA2 template # FA2 = sp.import_script_from_url("https://smartpy.io/dev/templates/FA2.py") class TezosLandNft(FA2.FA2): ... which has the following offchain views ...
2
votes
1answer
46 views

Cyclic inter contract calling in smartpy

What I am trying to achieve is that, once I receive data from another contract my contract should return data after computation to same contract who has sent the data. Computational Contract import ...
2
votes
1answer
74 views

How do we use getBalance() function in FA1.2 token contract in SmartPy?

https://smartpy.io/demo/index.html?template=FA1.2.py&source=post_page--------------------------- This is the token contract link. It is deployed on the https://babylonnet.SmartPy.io node with the ...
2
votes
2answers
99 views

Tezos Blockchain Time in SmartPy

I am new to Tezos Block chain and I am writing a smart-contract for crowdfunding using smartPy. For this I need current date time of Tezos Block chain. So, can anyone help me out, how to find out this?...
2
votes
1answer
51 views

How can I delay executing a smart contract until 30 minutes after its last invocation using Tezos SmartPy?

I have a function f1 in tezos contract that can be invoked by a node but after 30 min of the invocation if no other function f' has been invoked the f1 has to continue its process normally otherwise ...
2
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0answers
54 views

how to hook function in smartpy FA2

when calling transfer method, how to call hook method on received smart contract. I'm using fa2 in smartpy
2
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0answers
37 views

how can i call specific smartpy tezos contract entrypoint using ConseilJs?

I am trying to set UI that allow users to interact with tezos smart contract by pressing some buttons that have to call the corresponding function in the smart contract with relative arguments
1
vote
2answers
117 views

Where are the API docs for SmartPy?

I'm working on a contract now and specifically I'd like to call a SmartPy API like sp.transfer(address, amount)? Is there a function like this? I can't find API docs for SmartPy and digging into the ...
1
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2answers
59 views

Best Language to Use with Tezos

There are a lot of options when it comes to coding Smart Contracts on Tezos. My question is simple, which of the supported languages is the best in terms of support, east of use, documentation, and ...
1
vote
1answer
32 views

Can we have a Time clocked transaction in Tezos?

I want to make an escrow contract where the transaction can be done after an interval. Is it possible / any hack that can make it happen? The balance should get deducted from the sender beforehand and ...
1
vote
2answers
82 views

Taquito default entrypoint not found

I have deployed a smart contract on carthagenet. The contract only has a single entry point. Taquito is not able to find that single entry point. I tried both default and root methods and it doesn'...
1
vote
2answers
42 views

Why is this big map update using up so many bytes?

In this question I asked why so much Tezos was burned when updating 380 cells in a grid. It's surprising to see how many bytes it actually took though. If you look at the transaction, there were 380 ...
1
vote
1answer
75 views

How to store and load custom FA2 NFT metadata?

First time I'm writing a smart contract. If anything doesn't make sense at all, feel free to call out what specifically doesn't make sense and suggest a better approach. Thanks! At a high level I just ...
1
vote
1answer
44 views

How do you set the time of a transfer when testing contracts with SmartPy?

Previously, to set the (virtual) time a transaction happened in SmartPy I used the flag now when running a command like run. Now it seems to cause an error (seems like something changed in an update). ...
1
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2answers
56 views

How can I write On Chain Contract Calls in Tezos Sandbox?

I am trying to write a test case in Tezos Sandbox that uses an On Chain Contract Call. To start with, I am trying to implement the example from SmartPy "On Chain Contract Calls - Collatz" ...
1
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1answer
25 views

What guarantees do we have when verifying the sender's identity (in SmartPy)?

When we check the address that called the current entry point e.g. in SmartPy: sp.verify(self.data.authorizedAddr == sp.sender) What guarantees do we have? For example, is it possible for someone ...
1
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2answers
76 views

How to get a contract storage data or call a “get” entrypoint from another contract in smartPy?

I want to interact with the FA12.py smart contract (https://smartpy.io/demo/index.html?template=FA1.2.py) and get the balance of a user, from another smart contract. the FA12 function that I tried to ...
1
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1answer
26 views

set a ui to allow to nodes interact via smartpy contract

Hii have wrote a smart contract using smartpy where i have two nodes that should interact with each other, now i want to set the user interface to simulate the nodes interact what should i use and ...
1
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2answers
55 views

How to total smartpy.TMutez type stored as values in smartpy.bigmap?

I have the following smartpy.bigmap in smart contract storage: import smartpy as sp self.data.init(bgmp=sp.bigmap(tkey=sp.TAddress,tvalue=sp.TMutez)) I would like to total all the stored tvalue so ...
1
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1answer
50 views

How do offchain views work and what guarantees do they provide?

What are the technical differences between offchain views vs onchain entry points? I know one of the differences is that onchain entry points mutate while offchain views don't. Are there any other ...
1
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1answer
38 views

How to add new record fields in data storage after contract deployment? Is storing JSON in a field viable?

AFAIK, there is no way to update storage types(ex: can't add a new record field to a Map<sp.Nat, sp.record(a=1)>) of a contract after deployment. (Correct me if I'm wrong). This means, after a ...
1
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1answer
17 views

Does smartpy propagate exceptions?

I'm doing something like this, but the invalid scenario assertion fails. Is there a way to propagate the exception from the other contract? Or do I just have to test that contract separately? class ...
1
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1answer
24 views

What are good examples of upgradable smartpy contracts using Proxy delegates or stored lambdas?

I'm trying to ensure my contract is upgradable and I learn best by looking at existing examples. Does anyone have any good examples to look at? Here are some links to previous stackoverflow Q&A's ...
1
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1answer
32 views

How to resolve sp.TKey is not sp.TAddress error in SmartPy?

I have a function like this @sp.entry_point def _verifySigPersonalSign(self,req,sig): sp.verify((req.deadline != sp.timestamp(0)) | (sp.now<=req.deadline), "request ...
1
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1answer
24 views

How to compare timestamps in tezos smartpy?

req passed to _verifySigPersonalSign will be of type ERC import smartpy as sp ERC = sp.TRecord(sender=sp.TAddress,to=sp.TAddress,deadline=sp.TTimestamp) class StoreValue(sp.Contract): @sp....
1
vote
1answer
28 views

What is the correct usage of sp.unpack()?

*Note that the answer to this question may be very similar to this one. I tried out the code below within a part of a larger lambda function and got the following error. The purpose is just to convert ...
1
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1answer
16 views

How can I avoid sp.TOption type when using sp.unpack()?

Within my smartpy contract, I want to convert from one type into another using sp.pack() and sp.unpack. Below is an example of the method I am trying to use, converting a string to bytes. ...
1
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2answers
65 views

How to Integrating SmartPy compiler within the browser?

I have been trying to integrate the SmartPy compiler toolchain within Cryptoverse wars Learning interface and have been going through this video (OCaml Under The Hood: SmartPy) and have encountered ...
1
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1answer
21 views

How can I manually create an on chain contract call?

Using tezos sandbox mode, I am trying to test an on chain contract call in isolation of the main contract which calls it. If my contract was the Collatz template, it would like be trying to run the ...
1
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1answer
37 views

Is it possible to convert types in SmartPy?

For example, converting a TMutez into a TString?
1
vote
1answer
27 views

How should sp.if be used?

I find I run into some unexpected behavior when using sp.if. e.g. a = False sp.if 1 > 2: a = True seems to result in a == True. The example below is doing so in the ...
1
vote
1answer
39 views

How do you do sp.record(sp.pack()) outside of SmartPy?

I have a smart contract which verifies a signature from Bob in order to do something. The contract was made using SmartPy and for testing the scenario I used the following code to produce a signature: ...
1
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1answer
19 views

Get current ChainId in smartPy contract

I'm trying to get the chain_id of the current chain evaluating a transaction or containing the smart contract with smartPy, but I got always error in init and in entrypoints when I try to affect the ...
1
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3answers
50 views

Operation has injection no error but is not included

My contract is here === === but not include == What's wrong! Please help me!
1
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1answer
38 views

sp.check_signature cryptographic function in SmartPy

I wanna ask about the parameters s and b in the cryptographic function: sp.check_signature(k, s, b) the second parameter s: is the string that we should inject in the blockchain or the signature ...
1
vote
1answer
72 views

How to interact with SmartPy BigMap in contract?

I would like to setup a smart contract that contains (as defined by smartpy) a BigMap storage. I have the following code: import smartpy as sp class contract(sp.Contract): def __init__(self): ...