Ola Language ABI
In order to interact programmatically with compiled ola programs, Ola language supports passing arguments using an ABI.
To illustrate this, we'll use the following example program:
contract BookExample {
struct Book {
u32 book_id;
string book_name;
}
fn createBook(u32 id, string name) -> (Book) {
Book myBook = Book({
book_name: name,
book_id: id
});
return myBook;
}
fn getBookName(Book _book) -> (string) {
return _book.book_name;
}
fn getBookId(Book _book) -> (u32) {
u32 b = _book.book_id + 1;
return b;
}
}ABI specification
When compiling a ola program, an ABI specification is generated and describes the interface of the program.
In this example, the ABI specification is:
ABI encode function and params
We can use the tools provided by ola-lang-abi to generate function selectors and function parameters corresponding to ABI.
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