get_bundles can return multiple bundles

- accept a list of tail transaction hashes instead
  of just one.
- return multiple bundles in the same order as
  the input tail hashes
- added test coverage
- modified calls to GetBundlesCommand() in the lib

WARNING: Breaking change!

iota/api.py

@@ -983,14 +983,14 @@ def get_account_data(self, start=0, stop=None, inclusion_states=False, security_
             security_level=security_level
         )
 
-    def get_bundles(self, transaction):
-        # type: (TransactionHash) -> dict
+    def get_bundles(self, transactions):
+        # type: (Iterable[TransactionHash]) -> dict
         """
         Returns the bundle(s) associated with the specified transaction
-        hash.
+        hashes.
 
-        :param TransactionHash transaction:
-            Transaction hash.  Must be a tail transaction.
+        :param Iterable[TransactionHash] transactions:
+            Transaction hashes.  Must be a tail transaction.
 
         :return:
             ``dict`` with the following structure::
@@ -1001,15 +1001,15 @@ def get_bundles(self, transaction):
                     always a list, even if only one bundle was found.
              }
 
-        :raise:
-          - :py:class:`iota.adapter.BadApiResponse` if any of the
-            bundles fails validation.
+        :raise :py:class:`iota.adapter.BadApiResponse`:
+          - if any of the bundles fails validation.
+          - if any of the bundles is not visible on the Tangle.
 
         References:
 
         - https://github.com/iotaledger/wiki/blob/master/api-proposal.md#getbundle
         """
-        return extended.GetBundlesCommand(self.adapter)(transaction=transaction)
+        return extended.GetBundlesCommand(self.adapter)(transactions=transactions)
 
     def get_inputs(
             self,

iota/commands/extended/broadcast_bundle.py

@@ -36,7 +36,7 @@ def _execute(self, request):
         # and validates it.
         # Returns List[List[TransactionTrytes]]
         # (outer list has one item in current implementation)
-        bundle = GetBundlesCommand(self.adapter)(transaction=request['tail_hash'])
+        bundle = GetBundlesCommand(self.adapter)(transactions=[request['tail_hash']])
         BroadcastTransactionsCommand(self.adapter)(trytes=bundle[0])
         return {
             'trytes': bundle[0],

iota/commands/extended/get_bundles.py

@@ -8,8 +8,8 @@
 from iota.commands import FilterCommand, RequestFilter
 from iota.commands.extended.traverse_bundle import TraverseBundleCommand
 from iota.exceptions import with_context
-from iota.filters import Trytes
 from iota.transaction.validator import BundleValidator
+from iota.filters import Trytes
 
 __all__ = [
     'GetBundlesCommand',
@@ -31,35 +31,41 @@ def get_response_filter(self):
         pass
 
     def _execute(self, request):
-        transaction_hash = request['transaction']  # type: TransactionHash
+        transaction_hashes = request['transactions']  # type: Iterable[TransactionHash]
+
+        bundles = []
+
+        # Fetch bundles one-by-one
+        for tx_hash in transaction_hashes:
+            bundle = TraverseBundleCommand(self.adapter)(
+                transaction=tx_hash
+            )['bundles'][0]  # Currently 1 bundle only
 
-        bundle = TraverseBundleCommand(self.adapter)(
-            transaction=transaction_hash
-        )['bundles'][0]  # Currently 1 bundle only
+            validator = BundleValidator(bundle)
 
-        validator = BundleValidator(bundle)
+            if not validator.is_valid():
+                raise with_context(
+                    exc=BadApiResponse(
+                        'Bundle failed validation (``exc.context`` has more info).',
+                    ),
 
-        if not validator.is_valid():
-            raise with_context(
-                exc=BadApiResponse(
-                    'Bundle failed validation (``exc.context`` has more info).',
-                ),
+                    context={
+                        'bundle': bundle,
+                        'errors': validator.errors,
+                    },
+                )
 
-                context={
-                    'bundle': bundle,
-                    'errors': validator.errors,
-                },
-            )
+            bundles.append(bundle)
 
         return {
-            # Always return a list, so that we have the necessary
-            # structure to return multiple bundles in a future
-            # iteration.
-            'bundles': [bundle],
+            'bundles': bundles,
         }
 
 class GetBundlesRequestFilter(RequestFilter):
     def __init__(self):
         super(GetBundlesRequestFilter, self).__init__({
-            'transaction': f.Required | Trytes(TransactionHash),
+            'transactions':
+                f.Required | f.Array | f.FilterRepeater(
+                    f.Required | Trytes(TransactionHash)
+                )
         })

iota/commands/extended/replay_bundle.py

@@ -34,7 +34,7 @@ def _execute(self, request):
         min_weight_magnitude = request['minWeightMagnitude']  # type: int
         transaction = request['transaction']  # type: TransactionHash
 
-        gb_response = GetBundlesCommand(self.adapter)(transaction=transaction)
+        gb_response = GetBundlesCommand(self.adapter)(transactions=[transaction])
 
         # Note that we only replay the first bundle returned by
         # ``getBundles``.

iota/commands/extended/utils.py

@@ -118,7 +118,7 @@ def get_bundles_from_transaction_hashes(
 
     # Find the bundles for each transaction.
     for txn in tail_transactions:
-        gb_response = GetBundlesCommand(adapter)(transaction=txn.hash)
+        gb_response = GetBundlesCommand(adapter)(transactions=[txn.hash])
         txn_bundles = gb_response['bundles']  # type: List[Bundle]
 
         if inclusion_states:

test/commands/extended/get_bundles_test.py

@@ -23,18 +23,24 @@ def setUp(self):
         super(GetBundlesRequestFilterTestCase, self).setUp()
 
         # noinspection SpellCheckingInspection
-        self.transaction = (
-            'TESTVALUE9DONTUSEINPRODUCTION99999KPZOTR'
-            'VDB9GZDJGZSSDCBIX9QOK9PAV9RMDBGDXLDTIZTWQ'
-        )
+        self.transactions = [
+            (
+                'TESTVALUE9DONTUSEINPRODUCTION99999KPZOTR'
+                'VDB9GZDJGZSSDCBIX9QOK9PAV9RMDBGDXLDTIZTWQ'
+            ),
+            (
+                'TESTVALUE9DONTUSEINPRODUCTION99999TAXQBF'
+                'ZMUQLZ9RXRRXQOUSAMGAPEKTZNERIKSDYGHQA9999'
+            ),
+        ]
 
     def test_pass_happy_path(self):
         """
         Request is valid.
         """
         # Raw trytes are extracted to match the IRI's JSON protocol.
         request = {
-            'transaction': self.transaction,
+            'transactions': self.transactions,
         }
 
         filter_ = self._filter(request)
@@ -47,17 +53,22 @@ def test_pass_compatible_types(self):
         Request contains values that can be converted to the expected
         types.
         """
+        # Convert first to TranscationHash
+        tx_hashes = []
+        for tx in self.transactions:
+            tx_hashes.append(TransactionHash(tx))
+
         filter_ = self._filter({
             # Any TrytesCompatible value will work here.
-            'transaction': TransactionHash(self.transaction),
+            'transactions': tx_hashes,
         })
 
         self.assertFilterPasses(filter_)
         self.assertDictEqual(
             filter_.cleaned_data,
 
             {
-                'transaction': self.transaction,
+                'transactions': self.transactions,
             },
         )
 
@@ -69,7 +80,7 @@ def test_fail_empty(self):
             {},
 
             {
-                'transaction': [f.FilterMapper.CODE_MISSING_KEY],
+                'transactions': [f.FilterMapper.CODE_MISSING_KEY],
             },
         )
 
@@ -79,7 +90,7 @@ def test_fail_unexpected_parameters(self):
         """
         self.assertFilterErrors(
             {
-                'transaction': TransactionHash(self.transaction),
+                'transactions': self.transactions,
 
                 # SAY "WHAT" AGAIN!
                 'what': 'augh!',
@@ -92,29 +103,73 @@ def test_fail_unexpected_parameters(self):
 
     def test_fail_transaction_wrong_type(self):
         """
-        ``transaction`` is not a TrytesCompatible value.
+        ``transactions`` contains no TrytesCompatible value.
         """
         self.assertFilterErrors(
             {
-                'transaction': 42,
+                'transactions': [42],
             },
 
             {
-                'transaction': [f.Type.CODE_WRONG_TYPE],
+                'transactions.0': [f.Type.CODE_WRONG_TYPE],
             },
         )
 
     def test_fail_transaction_not_trytes(self):
         """
-        ``transaction`` contains invalid characters.
+        ``transactions`` contains invalid characters.
+        """
+        self.assertFilterErrors(
+            {
+                'transactions': [b'not valid; must contain only uppercase and "9"'],
+            },
+
+            {
+                'transactions.0': [Trytes.CODE_NOT_TRYTES],
+            },
+        )
+
+    def test_fail_no_list(self):
+        """
+        ``transactions`` has one hash rather than a list of hashes.
+        """
+        self.assertFilterErrors(
+            {
+                'transactions': self.transactions[0],
+            },
+
+            {
+                'transactions': [f.Type.CODE_WRONG_TYPE],
+            },
+        )
+
+    def test_fail_transactions_contents_invalid(self):
+        """
+        ``transactions`` is a non-empyt array, but it contains invlaid values.
         """
         self.assertFilterErrors(
             {
-                'transaction': b'not valid; must contain only uppercase and "9"',
+                'transactions': [
+                    b'',
+                    True,
+                    None,
+                    b'not valid transaction hash',
+
+                    # A valid tx hash, this should not produce error
+                    TransactionHash(self.transactions[0]),
+
+                    65498731,
+                    b'9' * (TransactionHash.LEN +1),
+                ],
             },
 
             {
-                'transaction': [Trytes.CODE_NOT_TRYTES],
+                'transactions.0': [f.Required.CODE_EMPTY],
+                'transactions.1': [f.Type.CODE_WRONG_TYPE],
+                'transactions.2': [f.Required.CODE_EMPTY],
+                'transactions.3': [Trytes.CODE_NOT_TRYTES],
+                'transactions.5': [f.Type.CODE_WRONG_TYPE],
+                'transactions.6': [Trytes.CODE_WRONG_FORMAT],
             },
         )
 
@@ -286,7 +341,7 @@ def test_wireup(self):
             api = Iota(self.adapter)
 
             # Don't need to call with proper args here.
-            response = api.get_bundles('transaction')
+            response = api.get_bundles('transactions')
 
             self.assertTrue(mocked_command.called)
 
@@ -308,15 +363,45 @@ def test_happy_path(self):
             'trytes': [self.spam_trytes],
         })
 
-        response = self.command(transaction = self.tx_hash)
+        response = self.command(transactions = [self.tx_hash])
+
+        self.maxDiff = None
+        original_bundle = Bundle.from_tryte_strings(self.bundle_trytes)
+        self.assertListEqual(
+            response['bundles'][0].as_json_compatible(),
+            original_bundle.as_json_compatible(),
+        )
+
+    def test_happy_path_multiple_bundles(self):
+        """
+        Get two bundles with multiple transactions.
+        """
+        # We will fetch the same two bundle
+        for _ in range(2):
+            for txn_trytes in self.bundle_trytes:
+                self.adapter.seed_response('getTrytes', {
+                    'trytes': [txn_trytes],
+                })
+
+            self.adapter.seed_response('getTrytes', {
+                'trytes': [self.spam_trytes],
+            })
+
+        response = self.command(transactions = [self.tx_hash, self.tx_hash])
 
         self.maxDiff = None
         original_bundle = Bundle.from_tryte_strings(self.bundle_trytes)
+
         self.assertListEqual(
             response['bundles'][0].as_json_compatible(),
             original_bundle.as_json_compatible(),
         )
 
+        self.assertListEqual(
+            response['bundles'][1].as_json_compatible(),
+            original_bundle.as_json_compatible(),
+        )
+
     def test_validator_error(self):
         """
         TraverseBundleCommand returns bundle but it is invalid.
@@ -335,4 +420,4 @@ def test_validator_error(self):
         })
 
         with self.assertRaises(BadApiResponse):
-            response = self.command(transaction = self.tx_hash)
+            response = self.command(transactions = [self.tx_hash])