From 1c82ab0c0b98819a47cb3fc4e9561528cfdcdb29 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ceyhun=20=C5=9Een?= <ceyhuusen@gmail.com>
Date: Thu, 7 Nov 2024 11:36:49 +0700
Subject: [PATCH] blocks: Add get_chain_tips.

---
 src/client/rpc_api.rs | 21 ++++++++++++++++++++-
 src/ledger/block.rs   | 22 ++++++++++++++++++++--
 src/ledger/mod.rs     |  4 ++--
 3 files changed, 42 insertions(+), 5 deletions(-)

diff --git a/src/client/rpc_api.rs b/src/client/rpc_api.rs
index 8677174..2984216 100644
--- a/src/client/rpc_api.rs
+++ b/src/client/rpc_api.rs
@@ -17,7 +17,7 @@ use bitcoin::{
 };
 use bitcoincore_rpc::{
     json::{
-        self, GetRawTransactionResult, GetRawTransactionResultVin,
+        self, GetChainTipsResultStatus, GetRawTransactionResult, GetRawTransactionResultVin,
         GetRawTransactionResultVinScriptSig, GetRawTransactionResultVout,
         GetRawTransactionResultVoutScriptPubKey, GetTransactionResult, GetTransactionResultDetail,
         GetTransactionResultDetailCategory, GetTxOutResult, SignRawTransactionResult, WalletTxInfo,
@@ -609,6 +609,25 @@ impl RpcApi for Client {
             errors: None,
         })
     }
+
+    #[tracing::instrument(skip_all)]
+    fn get_chain_tips(&self) -> bitcoincore_rpc::Result<json::GetChainTipsResult> {
+        let height = self.ledger.get_block_height().unwrap();
+        let hash = if height == 0 {
+            BlockHash::all_zeros()
+        } else {
+            self.ledger.get_block_with_height(height)?.block_hash()
+        };
+
+        let tip = json::GetChainTipsResultTip {
+            height: height as u64,
+            hash,
+            branch_length: height as usize,
+            status: GetChainTipsResultStatus::Active,
+        };
+
+        Ok(vec![tip])
+    }
 }
 
 #[cfg(test)]
diff --git a/src/ledger/block.rs b/src/ledger/block.rs
index 46c2ae3..6017ff9 100644
--- a/src/ledger/block.rs
+++ b/src/ledger/block.rs
@@ -6,7 +6,7 @@ use crate::utils;
 use bitcoin::block::{Header, Version};
 use bitcoin::consensus::{Decodable, Encodable};
 use bitcoin::hashes::Hash;
-use bitcoin::{Address, Block, BlockHash, CompactTarget, Transaction, Txid};
+use bitcoin::{Address, Block, BlockHash, CompactTarget, Transaction, TxMerkleNode, Txid};
 use rusqlite::params;
 use std::str::FromStr;
 use std::time::{SystemTime, UNIX_EPOCH};
@@ -163,10 +163,28 @@ impl Ledger {
         let mut encoded_hash: Vec<u8> = Vec::new();
         hash.consensus_encode(&mut encoded_hash).unwrap();
 
+        // Handle genesis block.
+        if hash == BlockHash::all_zeros() {
+            return Ok(Block {
+                header: Header {
+                    version: Version::TWO,
+                    prev_blockhash: BlockHash::all_zeros(),
+                    merkle_root: TxMerkleNode::all_zeros(),
+                    time: 0,
+                    bits: CompactTarget::default(),
+                    nonce: 0,
+                },
+                txdata: vec![],
+            });
+        }
+
         let qr = match self.database.lock().unwrap().query_row(
             "SELECT body FROM blocks WHERE hash = ?1",
             params![encoded_hash],
-            |row| Ok(row.get::<_, Vec<u8>>(0).unwrap()),
+            |row| {
+                tracing::error!("row {:?}", row);
+                Ok(row.get::<_, Vec<u8>>(0).unwrap())
+            },
         ) {
             Ok(qr) => qr,
             Err(e) => {
diff --git a/src/ledger/mod.rs b/src/ledger/mod.rs
index 4b0120b..5867ff5 100644
--- a/src/ledger/mod.rs
+++ b/src/ledger/mod.rs
@@ -125,13 +125,13 @@ impl Ledger {
             (
                 height    INTEGER  NOT NULL,
                 time      INTEGER  NOT NULL,
-                hash      BLOB     NOT NULL,
+                hash      TEXT     NOT NULL,
                 coinbase  TEXT     NOT NULL,
                 body      BLOB     NOT NULL
 
                 CONSTRAINT height PRIMARY KEY
             );
-            INSERT INTO blocks (height, time, hash, coinbase, body) VALUES (0, 500000000, 0, 0, 0);
+            INSERT INTO blocks (height, time, hash, coinbase, body) VALUES (0, 500000000, '00000000000000000000', 0, 0);
 
             CREATE TABLE mempool
             (