# CPI (Native) Build examples of CPI (Cross Program Invocation) `factory` program will invoke the `counter` program. Complete all tasks below - Implement the programs - Deploy locally to `solana-test-validator` and test with Rust script # Task 1 - Implement [`init`](https://github.com/Cyfrin/solana-course/blob/main/apps/cpi/native/exercise/programs/factory/src/lib.rs) - Invoke `Init` on the `counter` program ```rust let cmd = counter::Cmd::Init; let ix = Instruction::new_with_borsh( *counter_program.key, &cmd, vec![ AccountMeta { pubkey: *payer.key, is_signer: true, is_writable: true, }, AccountMeta { pubkey: *counter_account.key, is_signer: true, is_writable: true, }, AccountMeta { pubkey: *system_program.key, is_signer: false, is_writable: false, }, ], ); invoke( &ix, &[ payer.clone(), counter_account.clone(), system_program.clone(), ], )?; ``` # Task 2 - Implement [`inc`](https://github.com/Cyfrin/solana-course/blob/main/apps/cpi/native/exercise/programs/factory/src/lib.rs) - Invoke `Inc` on the `counter` program ```rust let cmd = counter::Cmd::Inc; let ix = Instruction::new_with_borsh( *counter_program.key, &cmd, vec![AccountMeta { pubkey: *counter_account.key, is_signer: false, is_writable: true, }], ); invoke(&ix, &[counter_account.clone()])?; ``` # Build ```shell cd programs/counter cargo build-sbf cd programs/factory cargo build-sbf ``` # Test with script Run local validator ```shell solana config set -ul solana-test-validator ``` Deploy the programs ```shell cd programs/counter solana program deploy ./target/deploy/counter.so cd programs/factory solana program deploy ./target/deploy/factory.so ``` Execute [demo script](https://github.com/Cyfrin/solana-course/tree/main/apps/cpi/native/exercise/examples) ```shell FACTORY_PROGRAM_ID=your factory program ID COUNTER_PROGRAM_ID=your counter program ID RPC=http://localhost:8899 KEYPAIR=path to key pair cargo run $KEYPAIR $RPC $FACTORY_PROGRAM_ID $COUNTER_PROGRAM_ID ```