Update vendor (#1265)

vendor/github.com/mattermost/logr/levelcustom.go

@@ -0,0 +1,45 @@
+package logr
+
+import (
+	"sync"
+)
+
+// CustomFilter allows targets to enable logging via a list of levels.
+type CustomFilter struct {
+	mux    sync.RWMutex
+	levels map[LevelID]Level
+}
+
+// IsEnabled returns true if the specified Level exists in this list.
+func (st *CustomFilter) IsEnabled(level Level) bool {
+	st.mux.RLock()
+	defer st.mux.RUnlock()
+	_, ok := st.levels[level.ID]
+	return ok
+}
+
+// IsStacktraceEnabled returns true if the specified Level requires a stack trace.
+func (st *CustomFilter) IsStacktraceEnabled(level Level) bool {
+	st.mux.RLock()
+	defer st.mux.RUnlock()
+	lvl, ok := st.levels[level.ID]
+	if ok {
+		return lvl.Stacktrace
+	}
+	return false
+}
+
+// Add adds one or more levels to the list. Adding a level enables logging for
+// that level on any targets using this CustomFilter.
+func (st *CustomFilter) Add(levels ...Level) {
+	st.mux.Lock()
+	defer st.mux.Unlock()
+
+	if st.levels == nil {
+		st.levels = make(map[LevelID]Level)
+	}
+
+	for _, s := range levels {
+		st.levels[s.ID] = s
+	}
+}