From 24b3e9007a8ad0684edcee51df444b21a033e4ba Mon Sep 17 00:00:00 2001
From: moneromooo-monero <moneromooo-monero@users.noreply.github.com>
Date: Sun, 27 Mar 2016 12:35:36 +0100
Subject: Convey tx verification failure reasons to the RPC client

This allows appropriate action to be taken, like displaying
the reason to the user.

Do just that in simplewallet, which should help a lot in
determining why users fail to send.

Also make it so a tx which is accepted but not relayed is
seen as a success rather than a failure.
---
 src/cryptonote_core/tx_pool.cpp | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

(limited to 'src/cryptonote_core/tx_pool.cpp')

diff --git a/src/cryptonote_core/tx_pool.cpp b/src/cryptonote_core/tx_pool.cpp
index 5d67acdd2..829caaf0f 100644
--- a/src/cryptonote_core/tx_pool.cpp
+++ b/src/cryptonote_core/tx_pool.cpp
@@ -97,6 +97,7 @@ namespace cryptonote
     if(!check_inputs_types_supported(tx))
     {
       tvc.m_verifivation_failed = true;
+      tvc.m_invalid_input = true;
       return false;
     }
 
@@ -113,6 +114,7 @@ namespace cryptonote
     {
       LOG_PRINT_L1("transaction use more money then it has: use " << print_money(outputs_amount) << ", have " << print_money(inputs_amount));
       tvc.m_verifivation_failed = true;
+      tvc.m_overspend = true;
       return false;
     }
 
@@ -124,6 +126,7 @@ namespace cryptonote
     {
       LOG_PRINT_L1("transaction fee is not enough: " << print_money(fee) << ", minimum fee: " << print_money(needed_fee));
       tvc.m_verifivation_failed = true;
+      tvc.m_fee_too_low = true;
       return false;
     }
 
@@ -132,6 +135,7 @@ namespace cryptonote
     {
       LOG_PRINT_L1("transaction is too big: " << blob_size << " bytes, maximum size: " << tx_size_limit);
       tvc.m_verifivation_failed = true;
+      tvc.m_too_big = true;
       return false;
     }
 
@@ -142,21 +146,23 @@ namespace cryptonote
       {
         LOG_PRINT_L1("Transaction with id= "<< id << " used already spent key images");
         tvc.m_verifivation_failed = true;
+        tvc.m_double_spend = true;
         return false;
       }
     }
 
-    if (!m_blockchain.check_tx_outputs(tx))
+    if (!m_blockchain.check_tx_outputs(tx, tvc))
     {
       LOG_PRINT_L1("Transaction with id= "<< id << " has at least one invalid outout");
       tvc.m_verifivation_failed = true;
+      tvc.m_invalid_output = true;
       return false;
     }
 
     crypto::hash max_used_block_id = null_hash;
     uint64_t max_used_block_height = 0;
 #if BLOCKCHAIN_DB == DB_LMDB
-    bool ch_inp_res = m_blockchain.check_tx_inputs(tx, max_used_block_height, max_used_block_id, kept_by_block);
+    bool ch_inp_res = m_blockchain.check_tx_inputs(tx, max_used_block_height, max_used_block_id, tvc, kept_by_block);
 #else
     bool ch_inp_res = m_blockchain.check_tx_inputs(tx, max_used_block_height, max_used_block_id);
 #endif
@@ -480,7 +486,8 @@ namespace cryptonote
       if(txd.last_failed_id != null_hash && m_blockchain.get_current_blockchain_height() > txd.last_failed_height && txd.last_failed_id == m_blockchain.get_block_id_by_height(txd.last_failed_height))
         return false;//we already sure that this tx is broken for this height
 
-      if(!m_blockchain.check_tx_inputs(txd.tx, txd.max_used_block_height, txd.max_used_block_id))
+      tx_verification_context tvc;
+      if(!m_blockchain.check_tx_inputs(txd.tx, txd.max_used_block_height, txd.max_used_block_id, tvc))
       {
         txd.last_failed_height = m_blockchain.get_current_blockchain_height()-1;
         txd.last_failed_id = m_blockchain.get_block_id_by_height(txd.last_failed_height);
@@ -496,7 +503,12 @@ namespace cryptonote
         if(txd.last_failed_id == m_blockchain.get_block_id_by_height(txd.last_failed_height))
           return false;
         //check ring signature again, it is possible (with very small chance) that this transaction become again valid
+#if BLOCKCHAIN_DB == DB_LMDB
+        tx_verification_context tvc;
+        if(!m_blockchain.check_tx_inputs(txd.tx, txd.max_used_block_height, txd.max_used_block_id, tvc))
+#else
         if(!m_blockchain.check_tx_inputs(txd.tx, txd.max_used_block_height, txd.max_used_block_id))
+#endif
         {
           txd.last_failed_height = m_blockchain.get_current_blockchain_height()-1;
           txd.last_failed_id = m_blockchain.get_block_id_by_height(txd.last_failed_height);
-- 
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