Add method for retrieving block headers from daemon

monero/backends/jsonrpc.py

@@ -60,6 +60,15 @@ class JSONRPCDaemon(object):
                 confirmations=0))
         return txs
 
+    def headers(self, start_height, end_height=None):
+        end_height = end_height or start_height
+        res = self.raw_jsonrpc_request('get_block_headers_range', {
+                'start_height': start_height,
+                'end_height': end_height})
+        if res['status'] == 'OK':
+            return res['headers']
+        raise Exception()
+
     def raw_request(self, path, data):
         hdr = {'Content-Type': 'application/json'}
         _log.debug(u"Request: {path}\nData: {data}".format(
@@ -76,7 +85,6 @@ class JSONRPCDaemon(object):
         _log.debug(u"Result:\n{result}".format(result=_ppresult))
         return result
 
-
     def raw_jsonrpc_request(self, method, params=None):
         hdr = {'Content-Type': 'application/json'}
         data = {'jsonrpc': '2.0', 'id': 0, 'method': method, 'params': params or {}}

monero/daemon.py

@@ -41,3 +41,13 @@ class Daemon(object):
         :rtype: list of :class:`Transaction <monero.transaction.Transaction>`
         """
         return self._backend.mempool()
+
+
+    def headers(self, start_height, end_height=None):
+        """
+        Returns block headers for given height range.
+        If no :param end_height: is given, it's assumed to be equal to :param start_height:
+
+        :rtype: list of dict
+        """
+        return self._backend.headers(start_height, end_height)

utils/daemoninfo.py

@@ -31,8 +31,15 @@ def get_daemon():
 
 d = get_daemon()
 info = d.info()
-print("Net: {net:>18s}\n"
+print("Net: {net:>15s}net\n"
     "Height:      {height:10d}\n"
-    "Difficulty:  {difficulty:10d}".format(
-        net='test' if info['testnet'] else 'live',
+    "Difficulty:  {difficulty:10d}\n"
+    "Alt blocks:  {alt_blocks_count:10d}\n".format(
+        net='test' if info['testnet'] \
+            else 'stage' if info['stagenet'] \
+            else 'main' if info['mainnet'] else 'unknown',
         **info))
+for hdr in reversed(d.headers(info['height']-7, info['height']-1)):
+    print("{height:10d} {hash} {block_size_kb:6.2f} kB {num_txes:3d} txn(s) "
+        "v{major_version:d}".format(
+            block_size_kb=hdr['block_size']/1024.0, **hdr))