Addresses #663 partially

bigchaindb/web/views/base.py

@@ -1,18 +1,19 @@
 """
 Common classes and methods for API handlers
 """
+import logging
 
 from flask import jsonify, request
 
+logger = logging.getLogger(__name__)
+
 
 def make_error(status_code, message=None):
     if status_code == 404 and message is None:
         message = 'Not found'
-
-    response = jsonify({
-        'status': status_code,
-        'message': message
-    })
+    response_content = {'status': status_code, 'message': message}
+    logger.error('HTTP API error: %(status)s - %(message)s', response_content)
+    response = jsonify(response_content)
     response.status_code = status_code
     return response
 

bigchaindb/web/views/transactions.py

@@ -4,6 +4,8 @@ For more information please refer to the documentation on ReadTheDocs:
  - https://docs.bigchaindb.com/projects/server/en/latest/drivers-clients/
    http-client-server-api.html
 """
+import logging
+
 from flask import current_app, request
 from flask_restful import Resource
 
@@ -24,6 +26,8 @@ import bigchaindb
 from bigchaindb.models import Transaction
 from bigchaindb.web.views.base import make_error
 
+logger = logging.getLogger(__name__)
+
 
 class TransactionApi(Resource):
     def get(self, tx_id):

setup.py

@@ -47,6 +47,7 @@ tests_require = [
     'flake8',
     'pylint',
     'pytest>=3.0.0',
+    'pytest-catchlog>=1.2.2',
     'pytest-cov>=2.2.1',
     'pytest-xdist',
     'pytest-flask',

tests/web/test_transactions.py

@@ -41,7 +41,7 @@ def test_post_create_transaction_endpoint(b, client):
     assert res.json['outputs'][0]['public_keys'][0] == user_pub
 
 
-def test_post_create_transaction_with_invalid_id(b, client):
+def test_post_create_transaction_with_invalid_id(b, client, caplog):
     from bigchaindb.common.exceptions import InvalidHash
     from bigchaindb.models import Transaction
     user_priv, user_pub = crypto.generate_key_pair()
@@ -51,14 +51,18 @@ def test_post_create_transaction_with_invalid_id(b, client):
     tx['id'] = 'abcd' * 16
 
     res = client.post(TX_ENDPOINT, data=json.dumps(tx))
-    assert res.status_code == 400
-    err_msg = ("The transaction's id '{}' isn't equal to "
-               "the hash of its body, i.e. it's not valid.").format(tx['id'])
-    assert res.json['message'] == (
-        'Invalid transaction ({}): {}'.format(InvalidHash.__name__, err_msg))
+    expected_status_code = 400
+    expected_error_message = (
+        "Invalid transaction ({}): The transaction's id '{}' isn't equal to "
+        "the hash of its body, i.e. it's not valid."
+    ).format(InvalidHash.__name__, tx['id'])
+    assert res.status_code == expected_status_code
+    assert res.json['message'] == expected_error_message
+    assert caplog.records[0].args['status'] == expected_status_code
+    assert caplog.records[0].args['message'] == expected_error_message
 
 
-def test_post_create_transaction_with_invalid_signature(b, client):
+def test_post_create_transaction_with_invalid_signature(b, client, caplog):
     from bigchaindb.common.exceptions import InvalidSignature
     from bigchaindb.models import Transaction
     user_priv, user_pub = crypto.generate_key_pair()
@@ -68,10 +72,15 @@ def test_post_create_transaction_with_invalid_signature(b, client):
     tx['inputs'][0]['fulfillment'] = 'cf:0:0'
 
     res = client.post(TX_ENDPOINT, data=json.dumps(tx))
-    assert res.status_code == 400
-    assert res.json['message'] == (
+    expected_status_code = 400
+    expected_error_message = (
         "Invalid transaction ({}): Fulfillment URI "
-        "couldn't been parsed".format(InvalidSignature.__name__))
+        "couldn't been parsed"
+    ).format(InvalidSignature.__name__)
+    assert res.status_code == expected_status_code
+    assert res.json['message'] == expected_error_message
+    assert caplog.records[0].args['status'] == expected_status_code
+    assert caplog.records[0].args['message'] == expected_error_message
 
 
 def test_post_create_transaction_with_invalid_structure(client):
@@ -79,16 +88,20 @@ def test_post_create_transaction_with_invalid_structure(client):
     assert res.status_code == 400
 
 
-def test_post_create_transaction_with_invalid_schema(client):
+def test_post_create_transaction_with_invalid_schema(client, caplog):
     from bigchaindb.models import Transaction
     user_priv, user_pub = crypto.generate_key_pair()
     tx = Transaction.create(
         [user_pub], [([user_pub], 1)]).sign([user_priv]).to_dict()
     del tx['version']
     res = client.post(TX_ENDPOINT, data=json.dumps(tx))
-    assert res.status_code == 400
-    assert res.json['message'] == (
+    expected_status_code = 400
+    expected_error_message = (
         "Invalid transaction schema: 'version' is a required property")
+    assert res.status_code == expected_status_code
+    assert res.json['message'] == expected_error_message
+    assert caplog.records[0].args['status'] == expected_status_code
+    assert caplog.records[0].args['message'] == expected_error_message
 
 
 @pytest.mark.parametrize('exc,msg', (
@@ -102,7 +115,7 @@ def test_post_create_transaction_with_invalid_schema(client):
     ('TransactionNotInValidBlock', 'Wait, maybe?'),
     ('ValueError', '?'),
 ))
-def test_post_invalid_transaction(client, exc, msg, monkeypatch):
+def test_post_invalid_transaction(client, exc, msg, monkeypatch, caplog):
     from bigchaindb.common import exceptions
     try:
         exc_cls = getattr(exceptions, exc)
@@ -117,9 +130,13 @@ def test_post_invalid_transaction(client, exc, msg, monkeypatch):
     monkeypatch.setattr(
         'bigchaindb.models.Transaction.from_dict', lambda tx: None)
     res = client.post(TX_ENDPOINT, data=json.dumps({}))
-    assert res.status_code == 400
+    expected_status_code = 400
+    expected_error_message = 'Invalid transaction ({}): {}'.format(exc, msg)
+    assert res.status_code == expected_status_code
     assert (res.json['message'] ==
             'Invalid transaction ({}): {}'.format(exc, msg))
+    assert caplog.records[2].args['status'] == expected_status_code
+    assert caplog.records[2].args['message'] == expected_error_message
 
 
 @pytest.mark.bdb
@@ -147,6 +164,7 @@ def test_post_transfer_transaction_endpoint(b, client, user_pk, user_sk):
 @pytest.mark.usefixtures('inputs')
 def test_post_invalid_transfer_transaction_returns_400(b, client, user_pk, user_sk):
     from bigchaindb.models import Transaction
+    from bigchaindb.common.exceptions import InvalidSignature
 
     user_priv, user_pub = crypto.generate_key_pair()
 
@@ -157,4 +175,8 @@ def test_post_invalid_transfer_transaction_returns_400(b, client, user_pk, user_
                                        asset_id=create_tx.id)
 
     res = client.post(TX_ENDPOINT, data=json.dumps(transfer_tx.to_dict()))
-    assert res.status_code == 400
+    expected_status_code = 400
+    expected_error_message = 'Invalid transaction ({}): {}'.format(
+        InvalidSignature.__name__, 'Transaction signature is invalid.')
+    assert res.status_code == expected_status_code
+    assert res.json['message'] == expected_error_message