verity_dp_zk_host/
builder.rs

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// Copyright 2023 RISC Zero, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

use std::{ collections::HashMap, env };

use risc0_build::{ embed_methods_with_options, DockerOptions, GuestOptions };
use risc0_build_ethereum::generate_solidity_files;

use dotenv;

/// Parameters for generating Solidity code.
pub struct SolidityBuildParams {
	/// Path to save the generated ImageID.sol file after building.
	pub solidity_image_id_path: String,
	/// Path to save the ELF.sol file after building.
	pub solidity_elf_path: String,
}

impl Default for SolidityBuildParams {
	fn default() -> Self {
		Self {
			solidity_image_id_path: String::from("../contracts/ImageID.sol"),
			solidity_elf_path: String::from("../tests/Elf.sol"),
		}
	}
}

/// Executes as a build hook in the guest repository.
/// This function builds the necessary Solidity files to identify the circuit.
/// Ensure it is added as a build dependency.
pub fn build_for_evm(build_params: SolidityBuildParams) {
	dotenv::dotenv().ok();

	// Builds can be made deterministic and reproducible by using Docker to build the
	// guest. Check the RISC0_USE_DOCKER variable and use Docker to build the guest if set.
	let use_docker = env
		::var("RISC0_USE_DOCKER")
		.ok()
		.map(|_| DockerOptions {
			root_dir: Some("../".into()),
		});

	// Generate Rust source files for the methods crate.
	let guests = embed_methods_with_options(
		HashMap::from([
			(
				"guests",
				GuestOptions {
					features: Vec::new(),
					use_docker,
				},
			),
		])
	);

	// Generate Solidity source files for use with Forge.
	let solidity_opts = risc0_build_ethereum::Options
		::default()
		.with_image_id_sol_path(build_params.solidity_image_id_path)
		.with_elf_sol_path(build_params.solidity_elf_path);

	generate_solidity_files(guests.as_slice(), &solidity_opts).unwrap();
}