Move Bank to its own crate

Also:
* counters.rs to solana_metrics
* genesis_block.rs to solana_sdk

sdk/src/genesis_block.rs

@@ -0,0 +1,110 @@
+//! The `genesis_block` module is a library for generating the chain's genesis block.
+
+use crate::hash::{hash, Hash};
+use crate::pubkey::Pubkey;
+use crate::signature::{Keypair, KeypairUtil};
+use std::fs::File;
+use std::io::Write;
+use std::path::Path;
+
+// The default (and minimal) amount of tokens given to the bootstrap leader:
+// * 1 token for the bootstrap leader ID account
+// * 1 token for the bootstrap leader vote account
+pub const BOOTSTRAP_LEADER_TOKENS: u64 = 2;
+
+#[derive(Serialize, Deserialize, Debug)]
+pub struct GenesisBlock {
+    pub bootstrap_leader_id: Pubkey,
+    pub bootstrap_leader_tokens: u64,
+    pub bootstrap_leader_vote_account_id: Pubkey,
+    pub mint_id: Pubkey,
+    pub tokens: u64,
+}
+
+impl GenesisBlock {
+    #[allow(clippy::new_ret_no_self)]
+    pub fn new(tokens: u64) -> (Self, Keypair) {
+        let tokens = tokens
+            .checked_add(BOOTSTRAP_LEADER_TOKENS)
+            .unwrap_or(tokens);
+        let mint_keypair = Keypair::new();
+        let bootstrap_leader_keypair = Keypair::new();
+        let bootstrap_leader_vote_account_keypair = Keypair::new();
+        (
+            Self {
+                bootstrap_leader_id: bootstrap_leader_keypair.pubkey(),
+                bootstrap_leader_tokens: BOOTSTRAP_LEADER_TOKENS,
+                bootstrap_leader_vote_account_id: bootstrap_leader_vote_account_keypair.pubkey(),
+                mint_id: mint_keypair.pubkey(),
+                tokens,
+            },
+            mint_keypair,
+        )
+    }
+
+    pub fn new_with_leader(
+        tokens: u64,
+        bootstrap_leader_id: Pubkey,
+        bootstrap_leader_tokens: u64,
+    ) -> (Self, Keypair) {
+        let mint_keypair = Keypair::new();
+        let bootstrap_leader_vote_account_keypair = Keypair::new();
+        (
+            Self {
+                bootstrap_leader_id,
+                bootstrap_leader_tokens,
+                bootstrap_leader_vote_account_id: bootstrap_leader_vote_account_keypair.pubkey(),
+                mint_id: mint_keypair.pubkey(),
+                tokens,
+            },
+            mint_keypair,
+        )
+    }
+
+    pub fn last_id(&self) -> Hash {
+        let serialized = serde_json::to_string(self).unwrap();
+        hash(&serialized.into_bytes())
+    }
+
+    pub fn load(ledger_path: &str) -> Result<Self, std::io::Error> {
+        let file = File::open(&Path::new(ledger_path).join("genesis.json"))?;
+        let genesis_block = serde_json::from_reader(file)?;
+        Ok(genesis_block)
+    }
+
+    pub fn write(&self, ledger_path: &str) -> Result<(), std::io::Error> {
+        let serialized = serde_json::to_string(self)?;
+        let mut file = File::create(&Path::new(ledger_path).join("genesis.json"))?;
+        file.write_all(&serialized.into_bytes())
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_genesis_block_new() {
+        let (genesis_block, mint) = GenesisBlock::new(10_000);
+        assert_eq!(genesis_block.tokens, 10_000 + BOOTSTRAP_LEADER_TOKENS);
+        assert_eq!(genesis_block.mint_id, mint.pubkey());
+        assert!(genesis_block.bootstrap_leader_id != Pubkey::default());
+        assert!(genesis_block.bootstrap_leader_vote_account_id != Pubkey::default());
+        assert_eq!(
+            genesis_block.bootstrap_leader_tokens,
+            BOOTSTRAP_LEADER_TOKENS
+        );
+    }
+
+    #[test]
+    fn test_genesis_block_new_with_leader() {
+        let leader_keypair = Keypair::new();
+        let (genesis_block, mint) =
+            GenesisBlock::new_with_leader(20_000, leader_keypair.pubkey(), 123);
+
+        assert_eq!(genesis_block.tokens, 20_000);
+        assert_eq!(genesis_block.mint_id, mint.pubkey());
+        assert_eq!(genesis_block.bootstrap_leader_id, leader_keypair.pubkey());
+        assert_eq!(genesis_block.bootstrap_leader_tokens, 123);
+    }
+}