Config program - useful for storing/updating simple config items on chain

programs/config_api/src/lib.rs

@@ -0,0 +1,26 @@
+use serde::Serialize;
+use solana_sdk::pubkey::Pubkey;
+
+mod config_instruction;
+mod config_transaction;
+
+pub use config_instruction::ConfigInstruction;
+pub use config_transaction::ConfigTransaction;
+
+const CONFIG_PROGRAM_ID: [u8; 32] = [
+    133, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0,
+];
+
+pub fn check_id(program_id: &Pubkey) -> bool {
+    program_id.as_ref() == CONFIG_PROGRAM_ID
+}
+
+pub fn id() -> Pubkey {
+    Pubkey::new(&CONFIG_PROGRAM_ID)
+}
+
+pub trait ConfigState: Serialize {
+    /// Maximum space that the serialized representation will require
+    fn max_space() -> u64;
+}