This repository shows how ink! can implement aggregation of metadata from crates.

On startup of the metadata binary(created by cargo-contract) on_startup macro will init the static variable of metadata defined in ink!(it also works from rlib crates).

After ink! can process this variable to generate an ABI. This schema allows defining events independently (And you also can use the same idea to generate ABI for all methods defined by the user).

You should build it with enabled lto(it is enabled in profile section of hello_cargo/Cargo.toml). To test this example you need to run:

cd hello_cargo
cargo build && ./target/debug/hello_cargo

You should see the next output:

Version: 3
selector: 131313, name: psp22_balance_of <------ method from contracts crate
selector: 161616, name: psp721_balance_of <------ method from contracts crate
selector: 1111111, name: some_ink_method
selector: 0, name: fallback_method
selector: 9, name: value
selector: 141414, name: psp22_transfer <------ method from contracts crate
selector: 8, name: flip
selector: 151515, name: psp721_transfer <------ method from contracts crate
event: 22 <------ event from contracts crate
event: 721 <------ event from contracts crate
event: 42
event: 123
event: 321