get_blockchain_top now returns void

It was always returning true, and could not be foreseen to
usefully return errors in the future. This silences CID 162652
as well as saves some checking code in a few places.

6 files changed, 9 insertions, 31 deletions

diff --git a/src/cryptonote_core/cryptonote_core.cpp b/src/cryptonote_core/cryptonote_core.cpp
index 56485aedf..14e37d580 100644
--- a/src/cryptonote_core/cryptonote_core.cpp
+++ b/src/cryptonote_core/cryptonote_core.cpp
@@ -211,10 +211,9 @@ namespace cryptonote
     return m_blockchain_storage.get_current_blockchain_height();
   }
   //-----------------------------------------------------------------------------------------------
-  bool core::get_blockchain_top(uint64_t& height, crypto::hash& top_id) const
+  void core::get_blockchain_top(uint64_t& height, crypto::hash& top_id) const
   {
     top_id = m_blockchain_storage.get_tail_id(height);
-    return true;
   }
   //-----------------------------------------------------------------------------------------------
   bool core::get_blocks(uint64_t start_offset, size_t count, std::list<std::pair<cryptonote::blobdata,block>>& blocks, std::list<cryptonote::blobdata>& txs) const
diff --git a/src/cryptonote_core/cryptonote_core.h b/src/cryptonote_core/cryptonote_core.h
index 4ea33dbe1..1aed86b25 100644
--- a/src/cryptonote_core/cryptonote_core.h
+++ b/src/cryptonote_core/cryptonote_core.h
@@ -299,10 +299,8 @@ namespace cryptonote
       *
       * @param height return-by-reference height of the block
       * @param top_id return-by-reference hash of the block
-      *
-      * @return true
       */
-     bool get_blockchain_top(uint64_t& height, crypto::hash& top_id) const;
+     void get_blockchain_top(uint64_t& height, crypto::hash& top_id) const;
 
      /**
       * @copydoc Blockchain::get_blocks(uint64_t, size_t, std::list<std::pair<cryptonote::blobdata,block>>&, std::list<transaction>&) const
diff --git a/src/rpc/core_rpc_server.cpp b/src/rpc/core_rpc_server.cpp
index 35b76f3d6..680d69d79 100644
--- a/src/rpc/core_rpc_server.cpp
+++ b/src/rpc/core_rpc_server.cpp
@@ -128,11 +128,7 @@ namespace cryptonote
   {
     CHECK_CORE_BUSY();
     crypto::hash top_hash;
-    if (!m_core.get_blockchain_top(res.height, top_hash))
-    {
-      res.status = "Failed";
-      return false;
-    }
+    m_core.get_blockchain_top(res.height, top_hash);
     ++res.height; // turn top block height into blockchain height
     res.top_block_hash = string_tools::pod_to_hex(top_hash);
     res.target_height = m_core.get_target_blockchain_height();
@@ -1061,13 +1057,7 @@ namespace cryptonote
     }
     uint64_t last_block_height;
     crypto::hash last_block_hash;
-    bool have_last_block_hash = m_core.get_blockchain_top(last_block_height, last_block_hash);
-    if (!have_last_block_hash)
-    {
-      error_resp.code = CORE_RPC_ERROR_CODE_INTERNAL_ERROR;
-      error_resp.message = "Internal error: can't get last block hash.";
-      return false;
-    }
+    m_core.get_blockchain_top(last_block_height, last_block_hash);
     block last_block;
     bool have_last_block = m_core.get_block_by_hash(last_block_hash, last_block);
     if (!have_last_block)
@@ -1300,11 +1290,7 @@ namespace cryptonote
     }
 
     crypto::hash top_hash;
-    if (!m_core.get_blockchain_top(res.height, top_hash))
-    {
-      res.status = "Failed";
-      return false;
-    }
+    m_core.get_blockchain_top(res.height, top_hash);
     ++res.height; // turn top block height into blockchain height
     res.top_block_hash = string_tools::pod_to_hex(top_hash);
     res.target_height = m_core.get_target_blockchain_height();
@@ -1716,11 +1702,7 @@ namespace cryptonote
     }
 
     crypto::hash top_hash;
-    if (!m_core.get_blockchain_top(res.height, top_hash))
-    {
-      res.status = "Failed";
-      return false;
-    }
+    m_core.get_blockchain_top(res.height, top_hash);
     ++res.height; // turn top block height into blockchain height
     res.target_height = m_core.get_target_blockchain_height();
 
diff --git a/tests/core_proxy/core_proxy.cpp b/tests/core_proxy/core_proxy.cpp
index 366937e1d..aea810a11 100644
--- a/tests/core_proxy/core_proxy.cpp
+++ b/tests/core_proxy/core_proxy.cpp
@@ -229,10 +229,9 @@ bool tests::proxy_core::get_short_chain_history(std::list<crypto::hash>& ids) {
     return true;
 }
 
-bool tests::proxy_core::get_blockchain_top(uint64_t& height, crypto::hash& top_id) {
+void tests::proxy_core::get_blockchain_top(uint64_t& height, crypto::hash& top_id) {
     height = 0;
     top_id = get_block_hash(m_genesis);
-    return true;
 }
 
 bool tests::proxy_core::init(const boost::program_options::variables_map& /*vm*/) {
diff --git a/tests/core_proxy/core_proxy.h b/tests/core_proxy/core_proxy.h
index 85518612a..09ed35b1b 100644
--- a/tests/core_proxy/core_proxy.h
+++ b/tests/core_proxy/core_proxy.h
@@ -74,7 +74,7 @@ namespace tests
     bool get_short_chain_history(std::list<crypto::hash>& ids);
     bool get_stat_info(cryptonote::core_stat_info& st_inf){return true;}
     bool have_block(const crypto::hash& id);
-    bool get_blockchain_top(uint64_t& height, crypto::hash& top_id);
+    void get_blockchain_top(uint64_t& height, crypto::hash& top_id);
     bool handle_incoming_tx(const cryptonote::blobdata& tx_blob, cryptonote::tx_verification_context& tvc, bool keeped_by_block, bool relayed, bool do_not_relay);
     bool handle_incoming_txs(const std::list<cryptonote::blobdata>& tx_blobs, std::vector<cryptonote::tx_verification_context>& tvc, bool keeped_by_block, bool relayed, bool do_not_relay);
     bool handle_incoming_block(const cryptonote::blobdata& block_blob, cryptonote::block_verification_context& bvc, bool update_miner_blocktemplate = true);
diff --git a/tests/unit_tests/ban.cpp b/tests/unit_tests/ban.cpp
index 82ff058b1..7d4daafb3 100644
--- a/tests/unit_tests/ban.cpp
+++ b/tests/unit_tests/ban.cpp
@@ -51,7 +51,7 @@ public:
   bool get_short_chain_history(std::list<crypto::hash>& ids) const { return true; }
   bool get_stat_info(cryptonote::core_stat_info& st_inf) const {return true;}
   bool have_block(const crypto::hash& id) const {return true;}
-  bool get_blockchain_top(uint64_t& height, crypto::hash& top_id)const{height=0;top_id=cryptonote::null_hash;return true;}
+  void get_blockchain_top(uint64_t& height, crypto::hash& top_id)const{height=0;top_id=cryptonote::null_hash;}
   bool handle_incoming_tx(const cryptonote::blobdata& tx_blob, cryptonote::tx_verification_context& tvc, bool keeped_by_block, bool relayed, bool do_not_relay) { return true; }
   bool handle_incoming_txs(const std::list<cryptonote::blobdata>& tx_blob, std::vector<cryptonote::tx_verification_context>& tvc, bool keeped_by_block, bool relayed, bool do_not_relay) { return true; }
   bool handle_incoming_block(const cryptonote::blobdata& block_blob, cryptonote::block_verification_context& bvc, bool update_miner_blocktemplate = true) { return true; }