rpc: new function and RPC to get alternative chain info

src/rpc/core_rpc_server.cpp

@@ -1337,6 +1337,24 @@ namespace cryptonote
     return true;
   }
   //------------------------------------------------------------------------------------------------------------------------------
+  bool core_rpc_server::on_get_alternate_chains(const COMMAND_RPC_GET_ALTERNATE_CHAINS::request& req, COMMAND_RPC_GET_ALTERNATE_CHAINS::response& res, epee::json_rpc::error& error_resp)
+  {
+    try
+    {
+      std::list<std::pair<Blockchain::block_extended_info, uint64_t>> chains = m_core.get_blockchain_storage().get_alternative_chains();
+      for (const auto &i: chains)
+      {
+        res.chains.push_back(COMMAND_RPC_GET_ALTERNATE_CHAINS::chain_info{epee::string_tools::pod_to_hex(get_block_hash(i.first.bl)), i.first.height, i.second, i.first.cumulative_difficulty});
+      }
+      res.status = CORE_RPC_STATUS_OK;
+    }
+    catch (...)
+    {
+      res.status = "Error retrieving alternate chains";
+    }
+    return true;
+  }
+  //------------------------------------------------------------------------------------------------------------------------------
   bool core_rpc_server::on_out_peers(const COMMAND_RPC_OUT_PEERS::request& req, COMMAND_RPC_OUT_PEERS::response& res)
   {
 	  // TODO

src/rpc/core_rpc_server.h

@@ -118,6 +118,7 @@ namespace cryptonote
         MAP_JON_RPC_WE("get_version",            on_get_version,                COMMAND_RPC_GET_VERSION)
         MAP_JON_RPC_WE("get_coinbase_tx_sum",    on_get_coinbase_tx_sum,        COMMAND_RPC_GET_COINBASE_TX_SUM)
         MAP_JON_RPC_WE("get_fee_estimate",       on_get_per_kb_fee_estimate,    COMMAND_RPC_GET_PER_KB_FEE_ESTIMATE)
+        MAP_JON_RPC_WE_IF("get_alternate_chains",on_get_alternate_chains,       COMMAND_RPC_GET_ALTERNATE_CHAINS, !m_restricted)
       END_JSON_RPC_MAP()
     END_URI_MAP2()
 
@@ -166,6 +167,7 @@ namespace cryptonote
     bool on_get_version(const COMMAND_RPC_GET_VERSION::request& req, COMMAND_RPC_GET_VERSION::response& res, epee::json_rpc::error& error_resp);
     bool on_get_coinbase_tx_sum(const COMMAND_RPC_GET_COINBASE_TX_SUM::request& req, COMMAND_RPC_GET_COINBASE_TX_SUM::response& res, epee::json_rpc::error& error_resp);
     bool on_get_per_kb_fee_estimate(const COMMAND_RPC_GET_PER_KB_FEE_ESTIMATE::request& req, COMMAND_RPC_GET_PER_KB_FEE_ESTIMATE::response& res, epee::json_rpc::error& error_resp);
+    bool on_get_alternate_chains(const COMMAND_RPC_GET_ALTERNATE_CHAINS::request& req, COMMAND_RPC_GET_ALTERNATE_CHAINS::response& res, epee::json_rpc::error& error_resp);
     //-----------------------
 
 private:

src/rpc/core_rpc_server_commands_defs.h

@@ -1336,4 +1336,39 @@ namespace cryptonote
       END_KV_SERIALIZE_MAP()
     };
   };
+
+  struct COMMAND_RPC_GET_ALTERNATE_CHAINS
+  {
+    struct request
+    {
+      BEGIN_KV_SERIALIZE_MAP()
+      END_KV_SERIALIZE_MAP()
+    };
+
+    struct chain_info
+    {
+      std::string block_hash;
+      uint64_t height;
+      uint64_t length;
+      uint64_t difficulty;
+
+      BEGIN_KV_SERIALIZE_MAP()
+        KV_SERIALIZE(block_hash)
+        KV_SERIALIZE(height)
+        KV_SERIALIZE(length)
+        KV_SERIALIZE(difficulty)
+      END_KV_SERIALIZE_MAP()
+    };
+
+    struct response
+    {
+      std::string status;
+      std::list<chain_info> chains;
+
+      BEGIN_KV_SERIALIZE_MAP()
+        KV_SERIALIZE(status)
+        KV_SERIALIZE(chains)
+      END_KV_SERIALIZE_MAP()
+    };
+  };
 }