50 lines
1.5 KiB
Go
50 lines
1.5 KiB
Go
// Licensed to Elasticsearch B.V. under one or more contributor
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// license agreements. See the NOTICE file distributed with
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// this work for additional information regarding copyright
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// ownership. Elasticsearch B.V. licenses this file to you under
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// the Apache License, Version 2.0 (the "License"); you may
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// not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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package socket
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import (
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"os/user"
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"strconv"
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)
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// UserCache is a cache of UID to username.
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type UserCache map[int]string
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// NewUserCache returns a new UserCache.
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func NewUserCache() UserCache {
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return map[int]string{0: "root"}
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}
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// LookupUID looks up a UID and returns the username associated with it. If
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// no username could be found an empty string is returned. The value will be
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// cached forever.
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func (c UserCache) LookupUID(uid int) string {
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if username, found := c[uid]; found {
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return username
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}
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// Cache the value (even on error).
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username, err := user.LookupId(strconv.Itoa(uid))
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if err != nil {
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c[uid] = ""
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return ""
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}
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c[uid] = username.Name
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return username.Name
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}
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