Implement getting blocks identifiers (#50)

README.md

@@ -243,6 +243,7 @@ Get a list of blocks — ``remme block get-list``:
 | ids         | String  |  No       | Identifiers to get a list of blocks by.            |
 | limit       | Integer |  No       | Maximum amount of blocks to return.                |
 | head        | Integer |  No       | Block identifier to get a list of transactions to. |
+| ids-only    | Bool    |  No       | The flag to get a list of blocks' identifiers.     |
 | reverse     | Bool    |  No       | Parameter to reverse result.                       |
 | node-url    | String  |  No       | Node URL to apply a command to.                    |
 
@@ -311,6 +312,19 @@ $ remme block get-list \
 }      
 ```
 
+Get a list of blocks' identifiers (can be combined with other parameters like `--limit`):
+
+```bash
+$ remme block get-list --ids-only --node-url=node-6-testnet.remme.io
+{
+    "result": [
+        "b757c74fbcd57ae12577b71490878affb6b688434c2e20170138760e72e937ca1bb3d6773e2ef37b5151ed74dcb663114a181072e0870e7a4d452c58659a6dbb",
+        "585f23725d1236e90e2b961b0c0c1404aba0ba5a96e4d85cd2f048b1d61b027669153e3618c84fc09a8041f8e149b97d50a89ee7761d0458cd57c63d5f354cbd",
+        ...
+    ]
+}
+```
+
 Get information about the block by its identifier — ``remme block get``:
 
 | Arguments | Type   |  Required | Description                                            |

cli/block/cli.py

@@ -14,6 +14,7 @@
     BLOCK_IDENTIFIER_ARGUMENT_HELP_MESSAGE,
     BLOCKS_HEAD_ARGUMENT_HELP_MESSAGE,
     BLOCKS_IDENTIFIERS_ARGUMENT_HELP_MESSAGE,
+    BLOCKS_IDENTIFIERS_ONLY_ARGUMENT_HELP_MESSAGE,
     BLOCKS_LIMIT_ARGUMENT_HELP_MESSAGE,
     BLOCKS_REVERSE_ARGUMENT_HELP_MESSAGE,
 )
@@ -41,9 +42,10 @@ def block_commands():
 @click.option('--limit', required=False, type=int, help=BLOCKS_LIMIT_ARGUMENT_HELP_MESSAGE)
 @click.option('--head', required=False, type=str, help=BLOCKS_HEAD_ARGUMENT_HELP_MESSAGE)
 @click.option('--reverse', required=False, is_flag=True, help=BLOCKS_REVERSE_ARGUMENT_HELP_MESSAGE)
+@click.option('--ids-only', required=False, is_flag=True, help=BLOCKS_IDENTIFIERS_ONLY_ARGUMENT_HELP_MESSAGE)
 @click.option('--node-url', required=False, type=str, help=NODE_URL_ARGUMENT_HELP_MESSAGE, default=default_node_url())
 @block_commands.command('get-list')
-def get_blocks(ids, head, limit, reverse, node_url):
+def get_blocks(ids, head, limit, reverse, ids_only, node_url):
     """
     Get a list of blocks.
     """
@@ -52,6 +54,7 @@ def get_blocks(ids, head, limit, reverse, node_url):
         'limit': limit,
         'head': head,
         'reverse': reverse,
+        'ids_only': ids_only,
         'node_url': node_url,
     })
 
@@ -62,13 +65,17 @@ def get_blocks(ids, head, limit, reverse, node_url):
     block_ids = arguments.get('ids')
     limit = arguments.get('limit')
     head = arguments.get('head')
+    ids_only = arguments.get('ids_only')
     node_url = arguments.get('node_url')
 
     remme = Remme(network_config={
         'node_address': str(node_url) + ':8080',
     })
 
-    result, errors = Block(service=remme).get_list(ids=block_ids, head=head, limit=limit, reverse=reverse)
+    if ids_only:
+        result, errors = Block(service=remme).get_list_ids(ids=block_ids, head=head, limit=limit, reverse=reverse)
+    else:
+        result, errors = Block(service=remme).get_list(ids=block_ids, head=head, limit=limit, reverse=reverse)
 
     if errors is not None:
         print_errors(errors=errors)

cli/block/forms.py

@@ -29,6 +29,7 @@ class GetBlocksListForm(Schema):
         ],
     )
     head = BlockIdentifierField(allow_none=True, required=False)
+    ids_only = fields.Boolean(required=False)
     node_url = NodeUrlField(required=False)
 
 

cli/block/help.py

@@ -6,3 +6,4 @@
 BLOCKS_LIMIT_ARGUMENT_HELP_MESSAGE = 'Maximum amount of blocks to return.'
 BLOCKS_HEAD_ARGUMENT_HELP_MESSAGE = 'Block identifier to get a list of transactions to.'
 BLOCKS_REVERSE_ARGUMENT_HELP_MESSAGE = 'Parameter to reverse result.'
+BLOCKS_IDENTIFIERS_ONLY_ARGUMENT_HELP_MESSAGE = 'The flag to get a list of blocks\' identifiers.'

cli/block/service.py

@@ -72,3 +72,28 @@ def get_list(self, ids, head, limit, reverse):
             return None, str(error)
 
         return blocks.get('data'), None
+
+    def get_list_ids(self, ids, head, limit, reverse):
+        """
+        Get a list of blocks identifiers.
+
+        A list of blocks identifiers could be filtered by blocks identifiers, limit, head, reverse.
+
+        Arguments:
+            ids (list, optional): identifiers to get a list of blocks by.
+            limit (int, optional): maximum amount of blocks to return.
+            head (string, optional): block identifier to get a list of transactions to.
+            reverse (bool, optional): parameter to reverse result.
+        """
+        blocks, errors = self.get_list(ids=ids, head=head, limit=limit, reverse=reverse)
+
+        if errors is not None:
+            return None, errors
+
+        blocks_identifiers = []
+
+        for block in blocks:
+            block_identifier = block.get('header_signature')
+            blocks_identifiers.append(block_identifier)
+
+        return blocks_identifiers, None

tests/block/test_get_blocks.py

@@ -315,6 +315,28 @@ def test_get_blocks_with_invalid_limit():
     assert dict_to_pretty_json(expected_error) in result.output
 
 
+def test_get_blocks_identifiers():
+    """
+    Case: get a list of blocks' identifiers.
+    Expect: a list of blocks' identifiers is returned.
+    """
+    runner = CliRunner()
+    result = runner.invoke(cli, [
+        'block',
+        'get-list',
+        '--ids-only',
+        '--node-url',
+        DEV_BRANCH_NODE_IP_ADDRESS_FOR_TESTING,
+    ])
+
+    blocks = json.loads(result.output).get('result')
+
+    assert PASSED_EXIT_FROM_COMMAND_CODE == result.exit_code
+
+    for block_identifier in blocks:
+        assert re.match(pattern=BLOCK_IDENTIFIER_REGEXP, string=block_identifier) is not None
+
+
 def test_get_blocks_invalid_node_url():
     """
     Case: get a list of blocks by passing invalid node URL.