RPC and ZeroMQ APIs to support p2pool

Adds the following:

- "get_miner_data" to RPC API
- "json-miner-data" to ZeroMQ subscriber contexts

Both provide the necessary data to create a custom block template. They are used by p2pool.

Data provided:

- major fork version
- current height
- previous block id
- RandomX seed hash
- network difficulty
- median block weight
- coins mined by the network so far
- mineable mempool transactions

1 files changed, 51 insertions, 1 deletions

diff --git a/src/rpc/core_rpc_server_commands_defs.h b/src/rpc/core_rpc_server_commands_defs.h
index ff8c98b98..1dbfc83a7 100644
--- a/src/rpc/core_rpc_server_commands_defs.h
+++ b/src/rpc/core_rpc_server_commands_defs.h
@@ -88,7 +88,7 @@ namespace cryptonote
 // advance which version they will stop working with
 // Don't go over 32767 for any of these
 #define CORE_RPC_VERSION_MAJOR 3
-#define CORE_RPC_VERSION_MINOR 7
+#define CORE_RPC_VERSION_MINOR 8
 #define MAKE_CORE_RPC_VERSION(major,minor) (((major)<<16)|(minor))
 #define CORE_RPC_VERSION MAKE_CORE_RPC_VERSION(CORE_RPC_VERSION_MAJOR, CORE_RPC_VERSION_MINOR)
 
@@ -940,6 +940,56 @@ namespace cryptonote
     typedef epee::misc_utils::struct_init<response_t> response;
   };
 
+  struct COMMAND_RPC_GETMINERDATA
+  {
+    struct request_t: public rpc_request_base
+    {
+      BEGIN_KV_SERIALIZE_MAP()
+        KV_SERIALIZE_PARENT(rpc_request_base)
+      END_KV_SERIALIZE_MAP()
+    };
+    typedef epee::misc_utils::struct_init<request_t> request;
+
+    struct response_t: public rpc_response_base
+    {
+      uint8_t major_version;
+      uint64_t height;
+      std::string prev_id;
+      std::string seed_hash;
+      std::string difficulty;
+      uint64_t median_weight;
+      uint64_t already_generated_coins;
+
+      struct tx_backlog_entry
+      {
+        std::string id;
+        uint64_t weight;
+        uint64_t fee;
+
+        BEGIN_KV_SERIALIZE_MAP()
+          KV_SERIALIZE(id)
+          KV_SERIALIZE(weight)
+          KV_SERIALIZE(fee)
+        END_KV_SERIALIZE_MAP()
+      };
+
+      std::vector<tx_backlog_entry> tx_backlog;
+
+      BEGIN_KV_SERIALIZE_MAP()
+        KV_SERIALIZE_PARENT(rpc_response_base)
+        KV_SERIALIZE(major_version)
+        KV_SERIALIZE(height)
+        KV_SERIALIZE(prev_id)
+        KV_SERIALIZE(seed_hash)
+        KV_SERIALIZE(difficulty)
+        KV_SERIALIZE(median_weight)
+        KV_SERIALIZE(already_generated_coins)
+        KV_SERIALIZE(tx_backlog)
+      END_KV_SERIALIZE_MAP()
+    };
+    typedef epee::misc_utils::struct_init<response_t> response;
+  };
+
   struct COMMAND_RPC_ADD_AUX_POW
   {
     struct aux_pow_t