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38 lines
1.2 KiB
38 lines
1.2 KiB
// Copyright 2019 The Prometheus Authors |
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// Licensed under the Apache License, Version 2.0 (the "License"); |
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// you may 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, software |
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// distributed under the License is distributed on an "AS IS" BASIS, |
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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// See the License for the specific language governing permissions and |
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// limitations under the License. |
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package util |
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import ( |
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"io" |
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"io/ioutil" |
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"os" |
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) |
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// ReadFileNoStat uses ioutil.ReadAll to read contents of entire file. |
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// This is similar to ioutil.ReadFile but without the call to os.Stat, because |
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// many files in /proc and /sys report incorrect file sizes (either 0 or 4096). |
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// Reads a max file size of 512kB. For files larger than this, a scanner |
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// should be used. |
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func ReadFileNoStat(filename string) ([]byte, error) { |
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const maxBufferSize = 1024 * 512 |
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f, err := os.Open(filename) |
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if err != nil { |
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return nil, err |
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} |
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defer f.Close() |
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reader := io.LimitReader(f, maxBufferSize) |
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return ioutil.ReadAll(reader) |
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}
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