Refactor MalwareCheckBase. Fixes #7091. (#7196)

* Refactor MalwareCheckBase. Fixes #7091.

Add Foreign Keys in MalwareVerdicts for other types of objects
(Releases, Projects).

* Change verdict dict to kwargs.

warehouse/malware/checks/base.py

@@ -10,18 +10,29 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from warehouse.malware.models import MalwareCheck, MalwareCheckState
+from warehouse.malware.models import MalwareCheck, MalwareCheckState, MalwareVerdict
 
 
 class MalwareCheckBase:
     def __init__(self, db):
         self.db = db
         self._name = self.__class__.__name__
-        self._load_check()
+        self._load_check_id()
+        self._verdicts = []
+
+    def add_verdict(self, **kwargs):
+        self._verdicts.append(MalwareVerdict(check_id=self.id, **kwargs))
 
     def run(self, obj_id):
         """
-        Executes the check.
+        Runs the check and inserts returned verdicts.
+        """
+        self.scan(obj_id)
+        self.db.add_all(self._verdicts)
+
+    def scan(self, obj_id):
+        """
+        Scans the object and returns a verdict.
         """
 
     def backfill(self, sample=1):
@@ -31,12 +42,7 @@ def backfill(self, sample=1):
         backfill on the entire corpus.
         """
 
-    def update(self):
-        """
-        Update the check definition in the database.
-        """
-
-    def _load_check(self):
+    def _load_check_id(self):
         self.id = (
             self.db.query(MalwareCheck.id)
             .filter(MalwareCheck.name == self._name)

warehouse/malware/checks/example.py

@@ -11,11 +11,7 @@
 # limitations under the License.
 
 from warehouse.malware.checks.base import MalwareCheckBase
-from warehouse.malware.models import (
-    MalwareVerdict,
-    VerdictClassification,
-    VerdictConfidence,
-)
+from warehouse.malware.models import VerdictClassification, VerdictConfidence
 
 
 class ExampleCheck(MalwareCheckBase):
@@ -30,12 +26,10 @@ class ExampleCheck(MalwareCheckBase):
     def __init__(self, db):
         super().__init__(db)
 
-    def run(self, file_id):
-        verdict = MalwareVerdict(
-            check_id=self.id,
+    def scan(self, file_id):
+        self.add_verdict(
             file_id=file_id,
             classification=VerdictClassification.benign,
             confidence=VerdictConfidence.High,
             message="Nothing to see here!",
         )
-        self.db.add(verdict)

warehouse/malware/models.py

@@ -115,7 +115,9 @@ class MalwareVerdict(db.Model):
         nullable=False,
         index=True,
     )
-    file_id = Column(ForeignKey("release_files.id"), nullable=False)
+    file_id = Column(ForeignKey("release_files.id"), nullable=True)
+    release_id = Column(ForeignKey("releases.id"), nullable=True)
+    project_id = Column(ForeignKey("projects.id"), nullable=True)
     classification = Column(
         Enum(VerdictClassification, values_callable=lambda x: [e.value for e in x]),
         nullable=False,
@@ -135,3 +137,5 @@ class MalwareVerdict(db.Model):
 
     check = orm.relationship("MalwareCheck", foreign_keys=[check_id], lazy=True)
     release_file = orm.relationship("File", foreign_keys=[file_id], lazy=True)
+    release = orm.relationship("Release", foreign_keys=[release_id], lazy=True)
+    project = orm.relationship("Project", foreign_keys=[project_id], lazy=True)

warehouse/migrations/versions/061ff3d24c22_add_malware_detection_tables.py

@@ -77,7 +77,9 @@ def upgrade():
             "run_date", sa.DateTime(), server_default=sa.text("now()"), nullable=False
         ),
         sa.Column("check_id", postgresql.UUID(as_uuid=True), nullable=False),
-        sa.Column("file_id", postgresql.UUID(as_uuid=True), nullable=False),
+        sa.Column("file_id", postgresql.UUID(as_uuid=True), nullable=True),
+        sa.Column("project_id", postgresql.UUID(as_uuid=True), nullable=True),
+        sa.Column("release_id", postgresql.UUID(as_uuid=True), nullable=True),
         sa.Column("classification", VerdictClassifications, nullable=False,),
         sa.Column("confidence", VerdictConfidences, nullable=False,),
         sa.Column("message", sa.Text(), nullable=True),
@@ -94,6 +96,8 @@ def upgrade():
             ["check_id"], ["malware_checks.id"], onupdate="CASCADE", ondelete="CASCADE"
         ),
         sa.ForeignKeyConstraint(["file_id"], ["release_files.id"]),
+        sa.ForeignKeyConstraint(["release_id"], ["releases.id"]),
+        sa.ForeignKeyConstraint(["project_id"], ["projects.id"]),
         sa.PrimaryKeyConstraint("id"),
     )
     op.create_index(