Move ErrorDelegate to its own file and add static utility functions to ErrorDelegate

sql/error_delegate_util.cc

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "sql/error_delegate_util.h"
+
+#include "third_party/sqlite/sqlite3.h"
+
+namespace sql {
+
+bool IsErrorCatastrophic(int error) {
+  switch (error) {
+    case SQLITE_DONE:
+    case SQLITE_OK:
+      // Theoretically, the wrapped delegate might have resolved the error, and
+      // we would end up here.
+      return false;
+
+    case SQLITE_CORRUPT:
+    case SQLITE_NOTADB:
+      // Highly unlikely we would ever recover from these.
+      return true;
+
+    case SQLITE_CANTOPEN:
+      // TODO(erikwright): Figure out what this means.
+      return false;
+
+    case SQLITE_IOERR:
+      // This could be broken blocks, in which case deleting the DB would be a
+      // good idea. But it might also be transient.
+      // TODO(erikwright): Figure out if we can distinguish between the two,
+      // or determine through metrics analysis to what extent these failures are
+      // transient.
+      return false;
+
+    case SQLITE_BUSY:
+      // Presumably transient.
+      return false;
+
+    case SQLITE_TOOBIG:
+    case SQLITE_FULL:
+    case SQLITE_NOMEM:
+      // Not a problem with the database.
+      return false;
+
+    case SQLITE_READONLY:
+      // Presumably either transient or we don't have the privileges to
+      // move/delete the file anyway.
+      return false;
+
+    case SQLITE_CONSTRAINT:
+    case SQLITE_ERROR:
+      // These probgably indicate a programming error or a migration failure
+      // that we prefer not to mask.
+      return false;
+
+    case SQLITE_LOCKED:
+    case SQLITE_INTERNAL:
+    case SQLITE_PERM:
+    case SQLITE_ABORT:
+    case SQLITE_INTERRUPT:
+    case SQLITE_NOTFOUND:
+    case SQLITE_PROTOCOL:
+    case SQLITE_EMPTY:
+    case SQLITE_SCHEMA:
+    case SQLITE_MISMATCH:
+    case SQLITE_MISUSE:
+    case SQLITE_NOLFS:
+    case SQLITE_AUTH:
+    case SQLITE_FORMAT:
+    case SQLITE_RANGE:
+    case SQLITE_ROW:
+      // None of these appear in error reports, so for now let's not try to
+      // guess at how to handle them.
+      return false;
+  }
+  return false;
+}
+
+}  // namespace sql