List orphaned blocks in the new blocks-bulk API

backend/src/api/chain-tips.ts

@@ -0,0 +1,53 @@
+import logger from "../logger";
+import bitcoinClient from "./bitcoin/bitcoin-client";
+
+export interface ChainTip {
+  height: number;
+  hash: string;
+  branchlen: number;
+  status: 'invalid' | 'active' | 'valid-fork' | 'valid-headers' | 'headers-only';
+};
+
+export interface OrphanedBlock {
+  height: number;
+  hash: string;
+  status: 'valid-fork' | 'valid-headers' | 'headers-only';
+}
+
+class ChainTips {
+  private chainTips: ChainTip[] = [];
+  private orphanedBlocks: OrphanedBlock[] = [];
+
+  public async updateOrphanedBlocks(): Promise<void> {
+    this.chainTips = await bitcoinClient.getChainTips();
+    this.orphanedBlocks = [];
+
+    for (const chain of this.chainTips) {
+      if (chain.status === 'valid-fork' || chain.status === 'valid-headers' || chain.status === 'headers-only') {
+        let block = await bitcoinClient.getBlock(chain.hash);
+        while (block && block.confirmations === -1) {
+          this.orphanedBlocks.push({
+            height: block.height,
+            hash: block.hash,
+            status: chain.status
+          });
+          block = await bitcoinClient.getBlock(block.previousblockhash);
+        }
+      }
+    }
+
+    logger.debug(`Updated orphaned blocks cache. Found ${this.orphanedBlocks.length} orphaned blocks`);
+  }
+
+  public getOrphanedBlocksAtHeight(height: number): OrphanedBlock[] {
+    const orphans: OrphanedBlock[] = [];
+    for (const block of this.orphanedBlocks) {
+      if (block.height === height) {
+        orphans.push(block);
+      }
+    }
+    return orphans;
+  }
+}
+
+export default new ChainTips();