Smart contract init failed with error coe

Smart Contracts
#1

I have called my init function but when I try to call my_function I get the following error:

Receive function schema not found in contract schema

My code is like this:

#[derive(Debug, Serialize, SchemaType)]
pub struct ReceiveParams {
param1: Vec,
param2: String,
}

#[receive(
contract = “my_project”,
name = “contract_my_function”,
parameter = “ReceiveParams”,
error = “Error”,
mutable
)]
fn contract_my_function<S: HasStateApi>(
ctx: &impl HasReceiveContext,
host: &mut impl HasHost <State< S >, StateApiType = S>,
) - > Result<bool, Error> {
…
}

and I generate the schema by calling:
cargo concordium build --schema-base64-out -

Is there anything else I need to do to for the parameters to be seen?

Edit

Also, if I refactor the code and rename the function my_function rather than contract_my_function then the error message becomes:

Update contract failed:

No receive function 'my_function of contract ‘my_contract’ ’ found in module
67d568433bd72e4326241f262213d77f446db8ba03dfba351ae35c1b2e7e510

I am sure I read previously that the receive functions need to begin with ‘contract_’ but the examples I was looking at did not have that so I removed it. Do I need to put it back or is this a different issue?

#2

  1. When using the contract you either have to embed the schema (using -e or --schema-embed) or you have to supply it to concordium-client. In that case you cannot use the base64 schema, but only the binary one.

  2. Receive function does not have to start with contract_. The --entrypoint argument in your case should be contract_my_function but I would recommned changing it to just my_function in the contracdt.

#3

Thank you for your quick reply

1 - I was following the tutorial here tutorial where seemed to use the base64 schema and then supplied this to the dApp. Did I misunderstand?

I tried to embed the schema using --schema-embed and then rebuilt the wasm file and redeployed the contract but now I get the error “The given transaction is not valid due to: unable to deserialize parameters, due to: Unable to find contract schema in module schema” when I try to call the Init function. Do I need to change the webpage calling code as well?

2 - Sorry, I am not sure exactly what you mean:

Do you mean that I should do this:

#[receive(
contract = “my_project”,
name = “contract_my_function”,
parameter = “ReceiveParams”,
error = “Error”,
mutable
)]
fn contract_my_function<S: HasStateApi>(

Or this:

#[receive(
contract = “my_project”,
name = “contract_my_function”,
parameter = “ReceiveParams”,
error = “Error”,
mutable
)]
**fn my_function<**S: HasStateApi>(

#4
  1. I meant
#[receive(
contract = “my_project”,
name = “my_function”,
parameter = “ReceiveParams”,
error = “Error”,
mutable
)]
**fn my_function<**S: HasStateApi>(

Re 1: Can you please provide a few more steps.

  • How exactly do you build.
  • How exactly are you deploying
  • How exactly are you sending a transaction.

Thank you.

#5

Of course:

This is my build command:
cargo concordium build --out my_project.wasm.v1

This is my deploy command:
concordium-client module deploy my_project.wasm.v1 --sender my_account --name my_project --grpc-port 10000 --grpc-ip node.testnet.concordium.com

I use this to get the schema (as per the previously linked tutorial)
cargo concordium build --schema-base64-out -
I copy this and paste the output in to the front end code in the variable LP_RAW_SCHEMA

Transaction code in the front end is:

if (!connection || !account) return;
	connection.signAndSendTransaction(
		account,
		AccountTransactionType.Update,
		{
			amount: new CcdAmount(BigInt(0)),
			address: {
				index: BigInt(0),
				subindex: BigInt(0),
			},
			receiveName: `${CONTRACT_NAME}.my_function`,
			maxContractExecutionEnergy: MAX_CONTRACT_EXECUTION_ENERGY,
		},
		{
			vec_param: [],
			string_param: '00000001',
		},
		LP_RAW_SCHEMA,
	).then((result) => {
		console.log('result', result);
	}).catch((error) => {
		console.error('view error', error);
	});
}

Is there any way I can look at the deployed smart contract and see what functions it thinks it has?

#6

Yes, you can use

concordium-client contract-show

Otherwise the commands look O assuming you update CONTRACT_NAME appropriately as well.

#7

And of course if you update the address as well. The one you are showing is the contract instance at address (0,0) which is probably not your contract.

#8

Thanks for the info.

I tried the command:

concordium-client module show project_name --out -

But I just get the error messge:
concordium-client.exe: user error (Cannot establish connection to GRPC endpoint.)

Is there some other setting somewhere I need?

The one you are showing is the contract instance at address (0,0) which is probably not your contract.
The output when I deployed said "Enter password for credential with index 0 and signing key with index 0: " and not done any updates or anything so I thought it would still be at 0,0.

Is that not right? If not, how do I determine which index it is at?

#9

Update - I did some refactoring and now the init and receive functions both seem to link together from front end to back end.

However, my view function fails with:

unable to deserialize parameters, due to: Receive function schema does not contain a parameter schema

However, the function does not take any parameters and the return struct has the SchemType trait on it?

Any suggestions as to what might be wrong?