plugin: Link checkers use Metadata class.

conservancy_beancount/errors.py

@@ -67,13 +67,17 @@ class ConfigurationError(Error):
 
 
 class InvalidMetadataError(Error):
-    def __init__(self, txn, key, value=None, post=None, source=None):
+    def __init__(self, txn, key, value=None, post=None, need_type=str, source=None):
         if post is None:
             srcname = 'transaction'
         else:
             srcname = post.account
         if value is None:
             msg = "{} missing {}".format(srcname, key)
-        else:
+        elif isinstance(value, need_type):
             msg = "{} has invalid {}: {}".format(srcname, key, value)
+        else:
+            msg = "{} has wrong type of {}: expected {} but is a {}".format(
+                srcname, key, need_type.__name__, type(value).__name__,
+            )
         super().__init__(msg, txn, source)

conservancy_beancount/plugin/meta_repo_links.py

@@ -23,11 +23,13 @@ from .. import errors as errormod
 from ..beancount_types import (
     MetaKey,
     MetaValue,
+    Posting,
     Transaction,
 )
 
 from typing import (
-    Mapping,
+    MutableMapping,
+    Optional,
 )
 
 class MetaRepoLinks(core.TransactionHook):
@@ -41,11 +43,18 @@ class MetaRepoLinks(core.TransactionHook):
         self.repo_path = repo_path
 
     def _check_links(self,
+                     meta: MutableMapping[MetaKey, MetaValue],
                      txn: Transaction,
-                     meta: Mapping[MetaKey, MetaValue],
+                     post: Optional[Posting]=None,
     ) -> errormod.Iter:
-        for key in data.LINK_METADATA.intersection(meta):
-            for link in str(meta[key]).split():
+        metadata = data.Metadata(meta)
+        for key in data.LINK_METADATA:
+            try:
+                links = metadata.get_links(key)
+            except TypeError:
+                yield errormod.InvalidMetadataError(txn, key, meta[key], post)
+            else:
+                for link in links:
                     match = self.PATH_PUNCT_RE.search(link)
                     if match and match.group(0) == ':':
                         pass
@@ -53,7 +62,7 @@ class MetaRepoLinks(core.TransactionHook):
                         yield errormod.BrokenLinkError(txn, key, link)
 
     def run(self, txn: Transaction) -> errormod.Iter:
-        yield from self._check_links(txn, txn.meta)
+        yield from self._check_links(txn.meta, txn)
         for post in txn.postings:
             if post.meta is not None:
-                yield from self._check_links(txn, post.meta)
+                yield from self._check_links(post.meta, txn, post)

conservancy_beancount/plugin/meta_rt_links.py

@@ -21,11 +21,13 @@ from .. import errors as errormod
 from ..beancount_types import (
     MetaKey,
     MetaValue,
+    Posting,
     Transaction,
 )
 
 from typing import (
-    Mapping,
+    MutableMapping,
+    Optional,
 )
 
 class MetaRTLinks(core.TransactionHook):
@@ -39,11 +41,18 @@ class MetaRTLinks(core.TransactionHook):
         self.rt = rt_wrapper
 
     def _check_links(self,
+                     meta: MutableMapping[MetaKey, MetaValue],
                      txn: Transaction,
-                     meta: Mapping[MetaKey, MetaValue],
+                     post: Optional[Posting]=None,
     ) -> errormod.Iter:
-        for key in self.LINK_METADATA.intersection(meta):
-            for link in str(meta[key]).split():
+        metadata = data.Metadata(meta)
+        for key in self.LINK_METADATA:
+            try:
+                links = metadata.get_links(key)
+            except TypeError:
+                yield errormod.InvalidMetadataError(txn, key, meta[key], post)
+            else:
+                for link in links:
                     if not link.startswith('rt:'):
                         continue
                     parsed = self.rt.parse(link)
@@ -51,7 +60,7 @@ class MetaRTLinks(core.TransactionHook):
                         yield errormod.BrokenRTLinkError(txn, key, link, parsed)
 
     def run(self, txn: Transaction) -> errormod.Iter:
-        yield from self._check_links(txn, txn.meta)
+        yield from self._check_links(txn.meta, txn)
         for post in txn.postings:
             if post.meta is not None:
-                yield from self._check_links(txn, post.meta)
+                yield from self._check_links(post.meta, txn, post)

tests/test_meta_repo_links.py

@@ -100,6 +100,18 @@ def test_bad_post_links(hook):
     actual = {error.message for error in hook.run(txn)}
     assert expected == actual
 
+@pytest.mark.parametrize('value', testutil.NON_STRING_METADATA_VALUES)
+def test_bad_metadata_type(hook, value):
+    txn = testutil.Transaction(**{'check': value}, postings=[
+        ('Income:Donations', -5),
+        ('Assets:Cash', 5),
+    ])
+    expected = {'transaction has wrong type of check: expected str but is a {}'.format(
+        type(value).__name__,
+    )}
+    actual = {error.message for error in hook.run(txn)}
+    assert expected == actual
+
 @pytest.mark.parametrize('ext_doc', [
     'rt:123',
     'rt:456/789',

tests/test_meta_rt_links.py

@@ -119,6 +119,18 @@ def test_bad_post_links(hook, link_source, format_error):
     actual = {error.message for error in hook.run(txn)}
     assert expected == actual
 
+@pytest.mark.parametrize('value', testutil.NON_STRING_METADATA_VALUES)
+def test_bad_metadata_type(hook, value):
+    txn = testutil.Transaction(**{'rt-id': value}, postings=[
+        ('Income:Donations', -5),
+        ('Assets:Cash', 5),
+    ])
+    expected = {'transaction has wrong type of rt-id: expected str but is a {}'.format(
+        type(value).__name__,
+    )}
+    actual = {error.message for error in hook.run(txn)}
+    assert expected == actual
+
 @pytest.mark.parametrize('ext_doc', [
     'statement.txt',
     'https://example.org/',