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// Copyright 2015 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 collector
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import (
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"bytes"
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"io/ioutil"
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"regexp"
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"strconv"
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"strings"
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)
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func readUintFromFile(path string) (uint64, error) {
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data, err := ioutil.ReadFile(path)
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if err != nil {
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return 0, err
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}
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value, err := strconv.ParseUint(strings.TrimSpace(string(data)), 10, 64)
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if err != nil {
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return 0, err
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}
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return value, nil
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}
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// Take a []byte{} and return a string based on null termination.
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// This is useful for situations where the OS has returned a null terminated
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// string to use.
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// If this function happens to receive a byteArray that contains no nulls, we
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// simply convert the array to a string with no bounding.
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func bytesToString(byteArray []byte) string {
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n := bytes.IndexByte(byteArray, 0)
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if n < 0 {
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return string(byteArray)
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}
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return string(byteArray[:n])
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}
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var metricNameRegex = regexp.MustCompile(`_*[^0-9A-Za-z_]+_*`)
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// Sanitize the given metric name by replacing invalid characters by underscores.
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//
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// OpenMetrics and the Prometheus exposition format require the metric name
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// to consist only of alphanumericals and "_", ":" and they must not start
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// with digits. Since colons in MetricFamily are reserved to signal that the
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// MetricFamily is the result of a calculation or aggregation of a general
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// purpose monitoring system, colons will be replaced as well.
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//
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// Note: If not subsequently prepending a namespace and/or subsystem (e.g.,
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// with prometheus.BuildFQName), the caller must ensure that the supplied
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// metricName does not begin with a digit.
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func SanitizeMetricName(metricName string) string {
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return metricNameRegex.ReplaceAllString(metricName, "_")
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}
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