Cleanup program account def (#5833)

sdk/src/account_info.rs

@@ -0,0 +1,48 @@
+use crate::pubkey::Pubkey;
+use std::{cmp, fmt};
+
+/// AccountInfo
+pub struct AccountInfo<'a> {
+    /// Public key of the account
+    pub key: &'a Pubkey,
+    /// Public key of the account
+    pub is_signer: bool,
+    /// Number of lamports owned by this account
+    pub lamports: &'a mut u64,
+    /// On-chain data within this account
+    pub data: &'a mut [u8],
+    /// Program that owns this account
+    pub owner: &'a Pubkey,
+}
+
+impl<'a> fmt::Debug for AccountInfo<'a> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        let data_len = cmp::min(64, self.data.len());
+        let data_str = if data_len > 0 {
+            format!(" data: {}", hex::encode(self.data[..data_len].to_vec()))
+        } else {
+            "".to_string()
+        };
+        write!(
+            f,
+            "AccountInfo {{ lamports: {} data.len: {} owner: {} {} }}",
+            self.lamports,
+            self.data.len(),
+            self.owner,
+            data_str,
+        )
+    }
+}
+
+impl<'a> AccountInfo<'a> {
+    pub fn deserialize_data<T: serde::de::DeserializeOwned>(&self) -> Result<T, bincode::Error> {
+        bincode::deserialize(&self.data)
+    }
+
+    pub fn serialize_data<T: serde::Serialize>(&mut self, state: &T) -> Result<(), bincode::Error> {
+        if bincode::serialized_size(state)? > self.data.len() as u64 {
+            return Err(Box::new(bincode::ErrorKind::SizeLimit));
+        }
+        bincode::serialize_into(&mut self.data[..], state)
+    }
+}