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

programs/config_api/src/config_instruction.rs

@@ -0,0 +1,29 @@
+use crate::id;
+use crate::ConfigState;
+use solana_sdk::pubkey::Pubkey;
+use solana_sdk::system_instruction::SystemInstruction;
+use solana_sdk::transaction::Instruction;
+
+pub struct ConfigInstruction {}
+
+impl ConfigInstruction {
+    /// Create a new, empty configuration account
+    pub fn new_account<T: ConfigState>(
+        from_account_pubkey: &Pubkey,
+        config_account_pubkey: &Pubkey,
+        lamports: u64,
+    ) -> Instruction {
+        SystemInstruction::new_program_account(
+            from_account_pubkey,
+            config_account_pubkey,
+            lamports,
+            T::max_space(),
+            &id(),
+        )
+    }
+
+    /// Store new data in a configuration account
+    pub fn new_store<T: ConfigState>(config_account_pubkey: &Pubkey, data: &T) -> Instruction {
+        Instruction::new(id(), data, vec![(*config_account_pubkey, true)])
+    }
+}