From 51d82346d53a9b435fbbdb65ab0fceb8ce130b32 Mon Sep 17 00:00:00 2001
From: Yigit Sever
Date: Wed, 14 Apr 2021 00:09:29 +0300
Subject: Implement multithreading for example miner

---
 examples/mining.rs | 63 +++++++++++++++++++++++++++++++++++++++++-------------
 1 file changed, 48 insertions(+), 15 deletions(-)

diff --git a/examples/mining.rs b/examples/mining.rs
index 21fdc58..1d86a20 100644
--- a/examples/mining.rs
+++ b/examples/mining.rs
@@ -1,33 +1,66 @@
 use chrono::NaiveDate;
 use gradecoin::schema::NakedBlock;
 use serde_json;
+use std::sync::{Arc, Mutex};
+use std::thread;
 use std::time::Instant;
 
 use blake2::{Blake2s, Digest};
 
+const N: usize = 4;
+
 pub fn main() {
-    let mut b = NakedBlock {
-        transaction_list: vec!["hash_value".to_owned()],
-        nonce: 0,
-        timestamp: NaiveDate::from_ymd(2021, 04, 08).and_hms(12, 30, 30),
-    };
+    let counter = Arc::new(Mutex::new(0));
 
     let now = Instant::now();
 
-    for nonce in 0..u32::MAX {
-        b.nonce = nonce;
+    let mut threads = Vec::with_capacity(N);
+
+    (0..N).for_each(|_| {
+        let counter = Arc::clone(&counter);
+        threads.push(thread::spawn(move || {
+            let mut b = NakedBlock {
+                transaction_list: vec!["e254275".to_owned()],
+                nonce: 0,
+                timestamp: NaiveDate::from_ymd(2021, 04, 13).and_hms(23, 38, 00),
+            };
+
+            let start: u32;
+            let end: u32;
+            {
+                let mut num = counter.lock().unwrap();
+
+                println!("Starting with 2 over {}", num);
+
+                start = 0 + (1073741824 * *num);
+                end = 1073741820 * (*num + 1);
+                *num += 1;
+            }
+
+            println!("here {} - {}", start, end);
+
+            for nonce in start..end {
+                b.nonce = nonce;
+
+                let j = serde_json::to_vec(&b).unwrap();
 
-        let j = serde_json::to_vec(&b).unwrap();
+                let result = Blake2s::digest(&j);
 
-        let result = Blake2s::digest(&j);
+                let first_six = result[0] as i32 + result[1] as i32 + (result[2]) as i32;
 
-        let first_six = result[31] as i32 + result[30] as i32 + result[29] as i32;
+                if first_six == 0 {
+                    println!("{} - {:x}\n{:?}", nonce, result, b);
+                    break;
+                }
+            }
+        }));
+    });
 
-        if first_six == 0 {
-            println!("{} - {:x}\n{:?}", nonce, result, b);
-            break;
-        }
-    }
+    threads.into_iter().for_each(|thread| {
+        thread
+            .join()
+            .expect("The thread creating or execution failed !")
+    });
 
     println!("it took {} seconds", now.elapsed().as_secs());
 }
-- 
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