add history subcommand

iavlread

@@ -34,25 +34,25 @@ def decode_output(format: str, data: bytes) -> str:
     elif format == 'u32':
         return struct.unpack('>I', data[:4])[0]
     elif format == 'u16':
-        return struct.unpack('>H', data[:4])[0]
+        return struct.unpack('>H', data[:2])[0]
     elif format == 'u8':
-        return struct.unpack('>B', data[:4])[0]
+        return struct.unpack('>B', data[:1])[0]
     elif format == 'i64':
         return struct.unpack('>q', data[:8])[0]
     elif format == 'i32':
         return struct.unpack('>i', data[:4])[0]
     elif format == 'i16':
-        return struct.unpack('>h', data[:4])[0]
+        return struct.unpack('>h', data[:2])[0]
     elif format == 'i8':
-        return struct.unpack('>b', data[:4])[0]
+        return struct.unpack('>b', data[:1])[0]
     elif format == 'i64ord':
         return struct.unpack('>Q', data[:8])[0] - (1<<63)
     elif format == 'i32ord':
         return struct.unpack('>I', data[:4])[0] - (1<<31)
     elif format == 'i16ord':
-        return struct.unpack('>H', data[:4])[0] - (1<<15)
+        return struct.unpack('>H', data[:2])[0] - (1<<15)
     elif format == 'i8ord':
-        return struct.unpack('>B', data[:4])[0] - (1<<7)
+        return struct.unpack('>B', data[:1])[0] - (1<<7)
     elif format.startswith('pbdict'):
         subformats = {'.' + id: subformat for x in format.split(',')[1:] for id, subformat in (x.split('='),)}
         return dict(decode_protobuf(subformats, '', data))
@@ -78,6 +78,9 @@ def get_args():
     p_get = subparsers.add_parser('get', help = 'Retrieve a single item')
     p_get.add_argument('prefix', help = 'Prefix (e.g. "s/k:emissions/")')
     p_get.add_argument('key', nargs='+', help = 'Key parts')
+    p_hist = subparsers.add_parser('history', help = 'Get all stored past values of the item')
+    p_hist.add_argument('prefix', help = 'Prefix (e.g. "s/k:emissions/")')
+    p_hist.add_argument('key', nargs='+', help = 'Key parts')
     p_count = subparsers.add_parser('count', help = 'Count number of items with a prefix')
     p_count.add_argument('prefix', help = 'Prefix (e.g. "s/k:emissions/")')
     p_count.add_argument('key', nargs='*', help = 'Key parts')
@@ -126,6 +129,14 @@ def run(args):
 
             if result is not None:
                 print(decode_output(valueformat, result))
+        elif args.cmd == 'history':
+            it = iavltree.history(db, args.prefix, keyformat, key, height)
+
+            try:
+                for h, v in it:
+                    print(f'{h} {decode_output(valueformat, v)}')
+            except BrokenPipeError:
+                pass
         elif args.cmd == 'count':
             result = iavltree.count(db, args.prefix, height, keyformat, key = key)