wallet_rpc_payments: implement multithreading

src/simplewallet/simplewallet.cpp

@@ -276,7 +276,7 @@ namespace
   const char* USAGE_PUBLIC_NODES("public_nodes");
   const char* USAGE_WELCOME("welcome");
   const char* USAGE_RPC_PAYMENT_INFO("rpc_payment_info");
-  const char* USAGE_START_MINING_FOR_RPC("start_mining_for_rpc");
+  const char* USAGE_START_MINING_FOR_RPC("start_mining_for_rpc [<number_of_threads>]");
   const char* USAGE_STOP_MINING_FOR_RPC("stop_mining_for_rpc");
   const char* USAGE_SHOW_QR_CODE("show_qr_code [<subaddress_index>]");
   const char* USAGE_VERSION("version");
@@ -2360,6 +2360,24 @@ bool simple_wallet::start_mining_for_rpc(const std::vector<std::string> &args)
   if (!try_connect_to_daemon())
     return true;
 
+  bool ok = true;
+  if(args.size() >= 1)
+  {
+    uint16_t num = 0;
+    ok = string_tools::get_xtype_from_string(num, args[0]);
+    m_rpc_payment_threads = num;
+  }
+  else
+  {
+    m_rpc_payment_threads = 0;
+  }
+
+  if (!ok)
+  {
+    PRINT_USAGE(USAGE_START_MINING_FOR_RPC);
+    return true;
+  }
+
   LOCK_IDLE_SCOPE();
 
   bool payment_required;
@@ -9272,7 +9290,7 @@ bool simple_wallet::check_rpc_payment()
       fail_msg_writer() << tr("Error mining to daemon: ") << error;
       m_cmd_binder.print_prompt();
     };
-    bool ret = m_wallet->search_for_rpc_payment(target, startfunc, contfunc, foundfunc, errorfunc);
+    bool ret = m_wallet->search_for_rpc_payment(target, m_rpc_payment_threads, startfunc, contfunc, foundfunc, errorfunc);
     if (!ret)
     {
       fail_msg_writer() << tr("Failed to start mining for RPC payment");

src/simplewallet/simplewallet.h

@@ -463,6 +463,7 @@ namespace cryptonote
     std::atomic<bool> m_need_payment;
     boost::posix_time::ptime m_last_rpc_payment_mining_time;
     bool m_rpc_payment_mining_requested;
+    uint32_t m_rpc_payment_threads = 0;
     bool m_daemon_rpc_payment_message_displayed;
     float m_rpc_payment_hash_rate;
     std::atomic<bool> m_suspend_rpc_payment_mining;

src/wallet/wallet2.h

@@ -1426,7 +1426,7 @@ private:
     bool get_rpc_payment_info(bool mining, bool &payment_required, uint64_t &credits, uint64_t &diff, uint64_t &credits_per_hash_found, cryptonote::blobdata &hashing_blob, uint64_t &height, uint64_t &seed_height, crypto::hash &seed_hash, crypto::hash &next_seed_hash, uint32_t &cookie);
     bool daemon_requires_payment();
     bool make_rpc_payment(uint32_t nonce, uint32_t cookie, uint64_t &credits, uint64_t &balance);
-    bool search_for_rpc_payment(uint64_t credits_target, const std::function<bool(uint64_t, uint64_t)> &startfunc, const std::function<bool(unsigned)> &contfunc, const std::function<bool(uint64_t)> &foundfunc = NULL, const std::function<void(const std::string&)> &errorfunc = NULL);
+    bool search_for_rpc_payment(uint64_t credits_target, uint32_t n_threads, const std::function<bool(uint64_t, uint64_t)> &startfunc, const std::function<bool(unsigned)> &contfunc, const std::function<bool(uint64_t)> &foundfunc = NULL, const std::function<void(const std::string&)> &errorfunc = NULL);
     template<typename T> void handle_payment_changes(const T &res, std::true_type) {
       if (res.status == CORE_RPC_STATUS_OK || res.status == CORE_RPC_STATUS_PAYMENT_REQUIRED)
         m_rpc_payment_state.credits = res.credits;

src/wallet/wallet_rpc_payments.cpp

@@ -42,6 +42,7 @@
 #include "cryptonote_basic/blobdatatype.h"
 #include "common/i18n.h"
 #include "common/util.h"
+#include "common/threadpool.h"
 
 #undef MONERO_DEFAULT_LOG_CATEGORY
 #define MONERO_DEFAULT_LOG_CATEGORY "wallet.wallet2.rpc_payments"
@@ -101,7 +102,7 @@ bool wallet2::make_rpc_payment(uint32_t nonce, uint32_t cookie, uint64_t &credit
   return true;
 }
 //----------------------------------------------------------------------------------------------------
-bool wallet2::search_for_rpc_payment(uint64_t credits_target, const std::function<bool(uint64_t, uint64_t)> &startfunc, const std::function<bool(unsigned)> &contfunc, const std::function<bool(uint64_t)> &foundfunc, const std::function<void(const std::string&)> &errorfunc)
+bool wallet2::search_for_rpc_payment(uint64_t credits_target, uint32_t n_threads, const std::function<bool(uint64_t, uint64_t)> &startfunc, const std::function<bool(unsigned)> &contfunc, const std::function<bool(uint64_t)> &foundfunc, const std::function<void(const std::string&)> &errorfunc)
 {
   bool need_payment = false;
   bool payment_required;
@@ -139,27 +140,42 @@ bool wallet2::search_for_rpc_payment(uint64_t credits_target, const std::functio
       continue;
     }
 
-    crypto::hash hash;
-    const uint32_t local_nonce = nonce++; // wrapping's OK
-    *(uint32_t*)(hashing_blob.data() + 39) = SWAP32LE(local_nonce);
+    if(n_threads == 0)
+      n_threads = boost::thread::hardware_concurrency();
+
+    std::vector<crypto::hash> hash(n_threads);
+    tools::threadpool& tpool = tools::threadpool::getInstance();
+    tools::threadpool::waiter waiter(tpool);
+
+    const uint32_t local_nonce = nonce += n_threads; // wrapping's OK
+    for (size_t i = 0; i < n_threads; i++)
+    {
+      tpool.submit(&waiter, [&, i] {
+        *(uint32_t*)(hashing_blob.data() + 39) = SWAP32LE(local_nonce-i);
         const uint8_t major_version = hashing_blob[0];
         if (major_version >= RX_BLOCK_VERSION)
         {
           const int miners = 1;
-      crypto::rx_slow_hash(height, seed_height, seed_hash.data, hashing_blob.data(), hashing_blob.size(), hash.data, miners, 0);
+          crypto::rx_slow_hash(height, seed_height, seed_hash.data, hashing_blob.data(), hashing_blob.size(), hash[i].data, miners, 0);
         }
         else
         {
           int cn_variant = hashing_blob[0] >= 7 ? hashing_blob[0] - 6 : 0;
-      crypto::cn_slow_hash(hashing_blob.data(), hashing_blob.size(), hash, cn_variant, height);
+          crypto::cn_slow_hash(hashing_blob.data(), hashing_blob.size(), hash[i], cn_variant, height);
         }
-    ++n_hashes;
-    if (cryptonote::check_hash(hash, diff))
+      });
+    }
+    waiter.wait();
+    n_hashes += n_threads;
+
+    for(size_t i=0; i < n_threads; i++)
+    {
+      if (cryptonote::check_hash(hash[i], diff))
       {
         uint64_t credits, balance;
         try
         {
-        make_rpc_payment(local_nonce, cookie, credits, balance);
+          make_rpc_payment(local_nonce-i, cookie, credits, balance);
           if (credits != credits_per_hash_found)
           {
             MERROR("Found nonce, but daemon did not credit us with the expected amount");
@@ -167,7 +183,7 @@ bool wallet2::search_for_rpc_payment(uint64_t credits_target, const std::functio
               errorfunc("Found nonce, but daemon did not credit us with the expected amount");
             return false;
           }
-        MDEBUG("Found nonce " << local_nonce << " at diff " << diff << ", gets us " << credits_per_hash_found << ", now " << balance << " credits");
+          MDEBUG("Found nonce " << local_nonce-i << " at diff " << diff << ", gets us " << credits_per_hash_found << ", now " << balance << " credits");
           if (!foundfunc(credits))
             break;
         }
@@ -185,6 +201,7 @@ bool wallet2::search_for_rpc_payment(uint64_t credits_target, const std::functio
         }
       }
     }
+  }
   return true;
 }
 //----------------------------------------------------------------------------------------------------