From 0599e005daa03e1cf4dc8e238c1c803c1970beb2 Mon Sep 17 00:00:00 2001
From: Yigit Sever
Date: Wed, 14 Apr 2021 21:48:49 +0300
Subject: Implement coinbase reward

---
 TODO.md         |  2 +-
 src/handlers.rs | 24 ++++++++++++++++--------
 2 files changed, 17 insertions(+), 9 deletions(-)

diff --git a/TODO.md b/TODO.md
index 946ac4a..1e909cd 100644
--- a/TODO.md
+++ b/TODO.md
@@ -1,7 +1,6 @@
 # TODO
 
 ## Simulation
-- [ ] "Coinbase" ("by" of the first transaction of the block) should get rewarded for their efforts
 - [ ] Bank mechanism should be added.
 
 ## Tests
@@ -36,3 +35,4 @@
 - [x] Recover database from files
 - [.] POST requests to /block should be authenticated as well (2021-04-13 04:50, they now are but until we make error messages **Verbose** there's not much point in testing because I honestly cannot trace the code)
 - [X] Blocks should "play out" the transactions and execute transactions (2021-04-14 21:29)
+- [X] "Coinbase" ("by" of the first transaction of the block) should get rewarded for their efforts (2021-04-14 21:48)
diff --git a/src/handlers.rs b/src/handlers.rs
index 420e82a..0dfea15 100644
--- a/src/handlers.rs
+++ b/src/handlers.rs
@@ -19,6 +19,7 @@ use warp::{http::StatusCode, reply};
 
 use crate::PRIVATE_KEY;
 const BLOCK_TRANSACTION_COUNT: u8 = 10;
+const BLOCK_REWARD: u8 = 3;
 
 // Encryption primitive
 type Aes128Cbc = Cbc<Aes128, Pkcs7>;
@@ -360,19 +361,26 @@ pub async fn authorized_propose_block(
         let pending_transactions = db.pending_transactions.read();
         let mut users = db.users.write();
 
+        let coinbase_fingerprint = new_block.transaction_list.get(0).unwrap();
+
         for fingerprint in new_block.transaction_list.iter() {
-            let transaction = pending_transactions.get(fingerprint).unwrap();
-            let source = &transaction.source;
-            let target = &transaction.target;
+            if let Some(transaction) = pending_transactions.get(fingerprint) {
+                let source = &transaction.source;
+                let target = &transaction.target;
 
-            if let Some(from) = users.get_mut(source) {
-                from.balance -= transaction.amount;
-            }
+                if let Some(from) = users.get_mut(source) {
+                    from.balance -= transaction.amount;
+                }
 
-            if let Some(to) = users.get_mut(target) {
-                to.balance += transaction.amount;
+                if let Some(to) = users.get_mut(target) {
+                    to.balance += transaction.amount;
+                }
             }
         }
+
+        if let Some(coinbase_user) = users.get_mut(coinbase_fingerprint) {
+            coinbase_user.balance += BLOCK_REWARD as i32;
+        }
     }
 
     {
-- 
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