Error code standardization

internal/common/check/black.go

@@ -0,0 +1,21 @@
+package check
+
+import (
+	discoveryRegistry "Open_IM/pkg/discoveryregistry"
+	"context"
+)
+
+type BlackChecker struct {
+	zk discoveryRegistry.SvcDiscoveryRegistry
+}
+
+func NewBlackChecker(zk discoveryRegistry.SvcDiscoveryRegistry) *BlackChecker {
+	return &BlackChecker{
+		zk: zk,
+	}
+}
+
+// possibleBlackUserID是否被userID拉黑，也就是是否在userID的黑名单中
+func (b *BlackChecker) IsBlocked(ctx context.Context, possibleBlackUserID, userID string) (bool, error) {
+
+}