rpc: add getblockbyheight call.

lib/http/rpc.js

@@ -82,6 +82,7 @@ RPC.prototype.init = function init() {
   this.add('getbestblockhash', this.getBestBlockHash);
   this.add('getblockcount', this.getBlockCount);
   this.add('getblock', this.getBlock);
+  this.add('getblockbyheight', this.getBlockByHeight);
   this.add('getblockhash', this.getBlockHash);
   this.add('getblockheader', this.getBlockHeader);
   this.add('getchaintips', this.getChainTips);
@@ -496,6 +497,7 @@ RPC.prototype.getBlock = co(function* getBlock(args, help) {
   var valid = new Validator([args]);
   var hash = valid.hash(0);
   var verbose = valid.bool(1, true);
+  var details = valid.bool(2, false);
   var entry, block;
 
   if (help || args.length < 1 || args.length > 2)
@@ -524,7 +526,43 @@ RPC.prototype.getBlock = co(function* getBlock(args, help) {
   if (!verbose)
     return block.toRaw().toString('hex');
 
-  return yield this.blockToJSON(entry, block, false);
+  return yield this.blockToJSON(entry, block, details);
+});
+
+RPC.prototype.getBlockByHeight = co(function* getBlockByHeight(args, help) {
+  var valid = new Validator([args]);
+  var height = valid.u32(0, -1);
+  var verbose = valid.bool(1, true);
+  var details = valid.bool(2, false);
+  var entry, block;
+
+  if (help || args.length < 1 || args.length > 3)
+    throw new RPCError(errs.MISC_ERROR, 'getblockbyheight "height" ( verbose )');
+
+  if (height === -1)
+    throw new RPCError(errs.TYPE_ERROR, 'Invalid block height.');
+
+  entry = yield this.chain.db.getEntry(height);
+
+  if (!entry)
+    throw new RPCError(errs.MISC_ERROR, 'Block not found');
+
+  block = yield this.chain.db.getBlock(entry.hash);
+
+  if (!block) {
+    if (this.chain.options.spv)
+      throw new RPCError(errs.MISC_ERROR, 'Block not available (spv mode)');
+
+    if (this.chain.options.prune)
+      throw new RPCError(errs.MISC_ERROR, 'Block not available (pruned data)');
+
+    throw new RPCError(errs.DATABASE_ERROR, 'Can\'t read block from disk');
+  }
+
+  if (!verbose)
+    return block.toRaw().toString('hex');
+
+  return yield this.blockToJSON(entry, block, details);
 });
 
 RPC.prototype.getBlockHash = co(function* getBlockHash(args, help) {