sql: Add *all* primary sqlite result codes

For three reasons:

- There are only 31 of them, and we don't really expect any more to
  turn up (last happened in 2013, and we have a test for it happening)
- It makes for nicer debug output
- It always felt strange to only have a small subset in the enum

qutebrowser/misc/sql.py

@@ -19,6 +19,7 @@
 
 """Provides access to sqlite databases."""
 
+import enum
 import collections
 import contextlib
 import dataclasses
@@ -69,24 +70,45 @@ class UserVersion:
         return f'{self.major}.{self.minor}'
 
 
-class SqliteErrorCode:
+class SqliteErrorCode(enum.Enum):
+    """Primary error codes as used by sqlite.
 
-    """Error codes as used by sqlite.
+    See https://sqlite.org/rescode.html
-
-    See https://sqlite.org/rescode.html - note we only define the codes we use
-    in qutebrowser here.
     """
 
-    ERROR = 1  # generic error code
+    # pylint: disable=invalid-name
-    BUSY = 5  # database is locked
+
-    READONLY = 8  # attempt to write a readonly database
+    OK = 0  # Successful result
-    IOERR = 10  # disk I/O error
+    ERROR = 1  # Generic error
-    CORRUPT = 11  # database disk image is malformed
+    INTERNAL = 2  # Internal logic error in SQLite
-    FULL = 13  # database or disk is full
+    PERM = 3  # Access permission denied
-    CANTOPEN = 14  # unable to open database file
+    ABORT = 4  # Callback routine requested an abort
-    PROTOCOL = 15  # locking protocol error
+    BUSY = 5  # The database file is locked
-    CONSTRAINT = 19  # UNIQUE constraint failed
+    LOCKED = 6  # A table in the database is locked
-    NOTADB = 26  # file is not a database
+    NOMEM = 7  # A malloc() failed
+    READONLY = 8  # Attempt to write a readonly database
+    INTERRUPT = 9  # Operation terminated by sqlite3_interrupt()*/
+    IOERR = 10  # Some kind of disk I/O error occurred
+    CORRUPT = 11  # The database disk image is malformed
+    NOTFOUND = 12  # Unknown opcode in sqlite3_file_control()
+    FULL = 13  # Insertion failed because database is full
+    CANTOPEN = 14  # Unable to open the database file
+    PROTOCOL = 15  # Database lock protocol error
+    EMPTY = 16  # Internal use only
+    SCHEMA = 17  # The database schema changed
+    TOOBIG = 18  # String or BLOB exceeds size limit
+    CONSTRAINT = 19  # Abort due to constraint violation
+    MISMATCH = 20  # Data type mismatch
+    MISUSE = 21  # Library used incorrectly
+    NOLFS = 22  # Uses OS features not supported on host
+    AUTH = 23  # Authorization denied
+    FORMAT = 24  # Not used
+    RANGE = 25  # 2nd parameter to sqlite3_bind out of range
+    NOTADB = 26  # File opened that is not a database file
+    NOTICE = 27  # Notifications from sqlite3_log()
+    WARNING = 28  # Warnings from sqlite3_log()
+    ROW = 100  # sqlite3_step() has another row ready
+    DONE = 101  # sqlite3_step() has finished executing
 
 
 class Error(Exception):
@@ -104,8 +126,7 @@ class Error(Exception):
         """
         if self.error is None:
             return str(self)
-        else:
+        return self.error.databaseText()
-            return self.error.databaseText()
 
 
 class KnownError(Error):
@@ -130,9 +151,10 @@ def raise_sqlite_error(msg: str, error: QSqlError) -> None:
     error_code = error.nativeErrorCode()
     try:
         # https://sqlite.org/rescode.html#pve
-        primary_error_code = int(error_code) & 0xff
+        primary_error_code = SqliteErrorCode(int(error_code) & 0xff)
     except ValueError:
-        primary_error_code = None
+        # not an int, or unknown error code -> fall back to string
+        primary_error_code = error_code
 
     database_text = error.databaseText()
     driver_text = error.driverText()

scripts/dev/run_vulture.py

@@ -31,7 +31,7 @@ import vulture
 
 import qutebrowser.app  # pylint: disable=unused-import
 from qutebrowser.extensions import loader
-from qutebrowser.misc import objects
+from qutebrowser.misc import objects, sql
 from qutebrowser.utils import utils, version, qtutils
 # To run the decorators from there
 # pylint: disable=unused-import
@@ -150,6 +150,9 @@ def whitelist_generator():  # noqa: C901
     for name in list(qtutils.LibraryPath):
         yield f'qutebrowser.utils.qtutils.LibraryPath.{name}'
 
+    for name in list(sql.SqliteErrorCode):
+        yield f'qutebrowser.misc.sql.SqliteErrorCode.{name}'
+
 
 def filter_func(item):
     """Check if a missing function should be filtered or not.

tests/unit/misc/test_sql.py

@@ -19,6 +19,8 @@
 
 """Test the SQL API."""
 
+import sys
+import sqlite3
 import pytest
 
 import hypothesis
@@ -91,12 +93,15 @@ def test_sqlerror(klass):
 class TestSqlError:
 
     @pytest.mark.parametrize('error_code, exception', [
-        (sql.SqliteErrorCode.BUSY, sql.KnownError),
+        (sql.SqliteErrorCode.BUSY.value, sql.KnownError),
-        (sql.SqliteErrorCode.CONSTRAINT, sql.BugError),
+        (sql.SqliteErrorCode.CONSTRAINT.value, sql.BugError),
         # extended error codes
-        (sql.SqliteErrorCode.IOERR | (1<<8), sql.KnownError),  # SQLITE_IOERR_READ
         (
-            sql.SqliteErrorCode.CONSTRAINT | (1<<8),  # SQLITE_CONSTRAINT_CHECK
+            sql.SqliteErrorCode.IOERR.value | (1 << 8),  # SQLITE_IOERR_READ
+            sql.KnownError
+        ),
+        (
+            sql.SqliteErrorCode.CONSTRAINT.value | (1 << 8),  # SQLITE_CONSTRAINT_CHECK
             sql.BugError
         ),
     ])
@@ -115,7 +120,7 @@ class TestSqlError:
                     'type: UnknownError',
                     'database text: db text',
                     'driver text: driver text',
-                    'error code: 23 -> 23']
+                    'error code: 23 -> SqliteErrorCode.AUTH']
 
         assert caplog.messages == expected
 
@@ -125,6 +130,62 @@ class TestSqlError:
         err = klass("Message", sql_err)
         assert err.text() == "db text"
 
+    @pytest.mark.parametrize("code", list(sql.SqliteErrorCode))
+    @pytest.mark.skipif(
+        sys.version_info < (3, 11),
+        reason="sqlite error code constants added in Python 3.11",
+    )
+    def test_sqlite_error_codes(self, code):
+        """Cross check our error codes with the ones in Python 3.11+.
+
+        See https://github.com/python/cpython/commit/86d8b465231
+        """
+        pyvalue = getattr(sqlite3, f"SQLITE_{code.name}")
+        assert pyvalue == code.value
+
+    def test_sqlite_error_codes_reverse(self):
+        """Check if we have all error codes defined that Python has.
+
+        It would be nice if this was easier (and less guesswork).
+        However, the error codes are simply added as ints to the sqlite3 module
+        namespace (PyModule_AddIntConstant), and lots of other constants are there too.
+        """
+        # Start with all SQLITE_* names in the sqlite3 modules
+        consts = {n for n in dir(sqlite3) if n.startswith("SQLITE_")}
+        # All error codes we know about (tested above)
+        consts -= {f"SQLITE_{m.name}" for m in sql.SqliteErrorCode}
+        # Extended error codes or other constants. From the sqlite docs:
+        #
+        # Primary result code symbolic names are of the form "SQLITE_XXXXXX"
+        # where XXXXXX is a sequence of uppercase alphabetic characters.
+        # Extended result code names are of the form "SQLITE_XXXXXX_YYYYYYY"
+        # where the XXXXXX part is the corresponding primary result code and the
+        # YYYYYYY is an extension that further classifies the result code.
+        consts -= {c for c in consts if c.count("_") >= 2}
+        # All remaining sqlite constants which are *not* error codes.
+        consts -= {
+            "SQLITE_ANALYZE",
+            "SQLITE_ATTACH",
+            "SQLITE_DELETE",
+            "SQLITE_DENY",
+            "SQLITE_DETACH",
+            "SQLITE_FUNCTION",
+            "SQLITE_IGNORE",
+            "SQLITE_INSERT",
+            "SQLITE_PRAGMA",
+            "SQLITE_READ",
+            "SQLITE_RECURSIVE",
+            "SQLITE_REINDEX",
+            "SQLITE_SAVEPOINT",
+            "SQLITE_SELECT",
+            "SQLITE_TRANSACTION",
+            "SQLITE_UPDATE",
+        }
+        # If there is anything remaining here, either a new Python version added a new
+        # sqlite constant which is *not* an error, or there was a new error code added.
+        # Either add it to the set above, or to SqliteErrorCode.
+        assert not consts
+
 
 def test_init_table(database):
     database.table('Foo', ['name', 'val', 'lucky'])