rpc: Add getindexinfo RPC

src/index/base.cpp

@@ -319,3 +319,12 @@ void BaseIndex::Stop()
         m_thread_sync.join();
     }
 }
+
+IndexSummary BaseIndex::GetSummary() const
+{
+    IndexSummary summary{};
+    summary.name = GetName();
+    summary.synced = m_synced;
+    summary.best_block_height = m_best_block_index.load()->nHeight;
+    return summary;
+}

src/index/base.h

@@ -13,6 +13,12 @@
 
 class CBlockIndex;
 
+struct IndexSummary {
+    std::string name;
+    bool synced{false};
+    int best_block_height{0};
+};
+
 /**
  * Base class for indices of blockchain data. This implements
  * CValidationInterface and ensures blocks are indexed sequentially according
@@ -106,6 +112,9 @@ public:
 
     /// Stops the instance from staying in sync with blockchain updates.
     void Stop();
+
+    /// Get a summary of the index and its state.
+    IndexSummary GetSummary() const;
 };
 
 #endif // BITCOIN_INDEX_BASE_H