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Solana: Handle error in instruction
Error treatment in Solana instructions
In the context of Solana, instructions are a decisive component of Smart Contract programming. However, if an error occurs in the execution, it may be difficult to process and display information on the user interface (UI). In this article we will examine how error treatments can be implemented for instructions in Solana.
Define the function Handel_error
In order to treat errors in the instructions, we have to define a custom “Handle_error” function, which takes care of the display of the error message on the user interface. We can use the “result” type from the “STD :: result” module to return an error value.
`Rost
Use std :: result;
// Define a custom error type for instructions on instructions
#[Submit (debug)]
Struct Instruction Terror {
MSG: String,
}
implant
IMPL STD :: FMT :: Display for the instructions {{{
fn fmt (& self, f: & courage std :: fmt :: formatter) -> std :: fmt :: result {
You write! (F, “{}”, self.msg)
}
}
`
Define the function Clinet_token with error handling
After we have defined our user -defined fault type, we change the function Conal_token to process errors using the” Handle_error “function.
`Rost
Pub fn Casigs_token (CTX: Context
// … original code …
Match result :: Success {
Ok (token) => ok (()),
Err (e) => {
Eprintln! (“Errors in the claim of token: {}”, e);
Be error = error :: new (“do not use token”, e.to_string ());
Handle_error (error)
}
}
}
`
In this changed version we have added a “match” instruction that returns an error value if the instructions fail. If a mistake occurs, we are:
- Print an error message into the console.
- Create an instance of our custom “error” structure with the “New” method.
- Call the “Handle_error” function to display the error message on the user interface.
Implement the function Handel_error
In order to implement the “Handle_error” function, we can define a simple structure with which errors are displayed on the user interface:
`Rost
Use std :: error;
Use StD :: FMT;
// Define an instance of our custom error structure for dealing with errors
Structure errors {
Message: String,
}
Implal error :: error for errors {}
Impl FMT :: Display for errors {
fn fmt (& self, f: & courage fmt :: formatter) -> fmt :: result {
You write! (F, “{}”, self.message)
}
}
`
Example use
Here is an example of how to use the modified function Clinet_token:
`Rost
Use Solana_sdk :: {
Account_info :: {Next_Account_info, Accountinfo},
Entry point,
Command_eerror :: error as a solana
};
fn main () {
let account_id = “your_account_id”;
Let end_time = 10 * U64 :: Pow (9, 15);
EinPoint! (“Caell_token”). Invoke (& [account_id], & end_time)
. Expression (“do not claim”))
.unpacking();
}
`
In this example, we have replaced the “result” type by an error type that implemented the “Error” feature. Then we give our user -defined error structure with the macro “? ()` Over.
By implementing a robust error -loving mechanism, you can ensure that your Solana instructions are reliable and easy to use. Remember to organize and wait for your code by separating concerns between different parts of your code base.