json serialization for rpc-relevant monero types

Structured {de-,}serialization methods for (many new) types
which are used for requests or responses in the RPC.

New types include RPC requests and responses, and structs which compose
types within those.

# Conflicts:
#	src/cryptonote_core/blockchain.cpp

src/cryptonote_core/blockchain.cpp

@@ -1574,7 +1574,7 @@ void Blockchain::add_out_to_get_random_outs(COMMAND_RPC_GET_RANDOM_OUTPUTS_FOR_A
 
 uint64_t Blockchain::get_num_mature_outputs(uint64_t amount) const
 {
-  auto num_outs = m_db->get_num_outputs(amount);
+  uint64_t num_outs = m_db->get_num_outputs(amount);
   // ensure we don't include outputs that aren't yet eligible to be used
   // outpouts are sorted by height
   while (num_outs > 0)

src/cryptonote_core/cryptonote_core.cpp

@@ -790,6 +790,13 @@ namespace cryptonote
     return BLOCKS_SYNCHRONIZING_DEFAULT_COUNT_PRE_V4;
   }
   //-----------------------------------------------------------------------------------------------
+  bool core::are_key_images_spent_in_pool(const std::vector<crypto::key_image>& key_im, std::vector<bool> &spent) const
+  {
+    spent.clear();
+
+    return m_mempool.check_for_key_images(key_im, spent);
+  }
+  //-----------------------------------------------------------------------------------------------
   std::pair<uint64_t, uint64_t> core::get_coinbase_tx_sum(const uint64_t start_offset, const size_t count)
   {
     uint64_t emission_amount = 0;
@@ -1175,6 +1182,11 @@ namespace cryptonote
     return m_mempool.get_transactions_and_spent_keys_info(tx_infos, key_image_infos);
   }
   //-----------------------------------------------------------------------------------------------
+  bool core::get_pool_for_rpc(std::vector<cryptonote::rpc::tx_in_pool>& tx_infos, cryptonote::rpc::key_images_with_tx_hashes& key_image_infos) const
+  {
+    return m_mempool.get_pool_for_rpc(tx_infos, key_image_infos);
+  }
+  //-----------------------------------------------------------------------------------------------
   bool core::get_short_chain_history(std::list<crypto::hash>& ids) const
   {
     return m_blockchain_storage.get_short_chain_history(ids);

src/cryptonote_core/cryptonote_core.h

@@ -462,6 +462,13 @@ namespace cryptonote
       */
      bool get_pool_transactions_and_spent_keys_info(std::vector<tx_info>& tx_infos, std::vector<spent_key_image_info>& key_image_infos) const;
 
+     /**
+      * @copydoc tx_memory_pool::get_pool_for_rpc
+      *
+      * @note see tx_memory_pool::get_pool_for_rpc
+      */
+     bool get_pool_for_rpc(std::vector<cryptonote::rpc::tx_in_pool>& tx_infos, cryptonote::rpc::key_images_with_tx_hashes& key_image_infos) const;
+
      /**
       * @copydoc tx_memory_pool::get_transactions_count
       *
@@ -707,6 +714,16 @@ namespace cryptonote
       */
      bool are_key_images_spent(const std::vector<crypto::key_image>& key_im, std::vector<bool> &spent) const;
 
+     /**
+      * @brief check if multiple key images are spent in the transaction pool
+      *
+      * @param key_im list of key images to check
+      * @param spent return-by-reference result for each image checked
+      *
+      * @return true
+      */
+     bool are_key_images_spent_in_pool(const std::vector<crypto::key_image>& key_im, std::vector<bool> &spent) const;
+
      /**
       * @brief get the number of blocks to sync in one go
       *

src/cryptonote_core/tx_pool.cpp

@@ -684,6 +684,65 @@ namespace cryptonote
     return true;
   }
   //---------------------------------------------------------------------------------
+  bool tx_memory_pool::get_pool_for_rpc(std::vector<cryptonote::rpc::tx_in_pool>& tx_infos, cryptonote::rpc::key_images_with_tx_hashes& key_image_infos) const
+  {
+    CRITICAL_REGION_LOCAL(m_transactions_lock);
+    CRITICAL_REGION_LOCAL1(m_blockchain);
+    m_blockchain.for_all_txpool_txes([&tx_infos, key_image_infos](const crypto::hash &txid, const txpool_tx_meta_t &meta, const cryptonote::blobdata *bd){
+      cryptonote::rpc::tx_in_pool txi;
+      txi.tx_hash = txid;
+      transaction tx;
+      if (!parse_and_validate_tx_from_blob(*bd, tx))
+      {
+        MERROR("Failed to parse tx from txpool");
+        // continue
+        return true;
+      }
+      txi.tx = tx;
+      txi.blob_size = meta.blob_size;
+      txi.fee = meta.fee;
+      txi.kept_by_block = meta.kept_by_block;
+      txi.max_used_block_height = meta.max_used_block_height;
+      txi.max_used_block_hash = meta.max_used_block_id;
+      txi.last_failed_block_height = meta.last_failed_height;
+      txi.last_failed_block_hash = meta.last_failed_id;
+      txi.receive_time = meta.receive_time;
+      txi.relayed = meta.relayed;
+      txi.last_relayed_time = meta.last_relayed_time;
+      txi.do_not_relay = meta.do_not_relay;
+      tx_infos.push_back(txi);
+      return true;
+    }, true);
+
+    for (const key_images_container::value_type& kee : m_spent_key_images) {
+      std::vector<crypto::hash> tx_hashes;
+      const std::unordered_set<crypto::hash>& kei_image_set = kee.second;
+      for (const crypto::hash& tx_id_hash : kei_image_set)
+      {
+        tx_hashes.push_back(tx_id_hash);
+      }
+
+      const crypto::key_image& k_image = kee.first;
+      key_image_infos[k_image] = tx_hashes;
+    }
+    return true;
+  }
+  //---------------------------------------------------------------------------------
+  bool tx_memory_pool::check_for_key_images(const std::vector<crypto::key_image>& key_images, std::vector<bool> spent) const
+  {
+    CRITICAL_REGION_LOCAL(m_transactions_lock);
+    CRITICAL_REGION_LOCAL1(m_blockchain);
+
+    spent.clear();
+
+    for (const auto& image : key_images)
+    {
+      spent.push_back(m_spent_key_images.find(image) == m_spent_key_images.end() ? false : true);
+    }
+
+    return true;
+  }
+  //---------------------------------------------------------------------------------
   bool tx_memory_pool::get_transaction(const crypto::hash& id, cryptonote::blobdata& txblob) const
   {
     CRITICAL_REGION_LOCAL(m_transactions_lock);

src/cryptonote_core/tx_pool.h

@@ -46,6 +46,7 @@
 #include "blockchain_db/blockchain_db.h"
 #include "crypto/hash.h"
 #include "rpc/core_rpc_server_commands_defs.h"
+#include "rpc/message_data_structs.h"
 
 namespace cryptonote
 {
@@ -268,6 +269,28 @@ namespace cryptonote
      */
     bool get_transactions_and_spent_keys_info(std::vector<tx_info>& tx_infos, std::vector<spent_key_image_info>& key_image_infos) const;
 
+    /**
+     * @brief get information about all transactions and key images in the pool
+     *
+     * see documentation on tx_in_pool and key_images_with_tx_hashes for more details
+     *
+     * @param tx_infos [out] the transactions' information
+     * @param key_image_infos [out] the spent key images' information
+     *
+     * @return true
+     */
+    bool get_pool_for_rpc(std::vector<cryptonote::rpc::tx_in_pool>& tx_infos, cryptonote::rpc::key_images_with_tx_hashes& key_image_infos) const;
+
+    /**
+     * @brief check for presence of key images in the pool
+     *
+     * @param key_images [in] vector of key images to check
+     * @param spent [out] vector of bool to return
+     *
+     * @return true
+     */
+    bool check_for_key_images(const std::vector<crypto::key_image>& key_images, std::vector<bool> spent) const;
+
     /**
      * @brief get a specific transaction from the pool
      *