text: // Copyright 2018 The Prometheus Authors
  // Licensed under the Apache License, Version 2.0 (the "License");
  // you may not use this file except in compliance with the License.
  // You may obtain a copy of the License at
  //
  // http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing, software
  // distributed under the License is distributed on an "AS IS" BASIS,
  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  // See the License for the specific language governing permissions and
  // limitations under the License.
  
  package util
  
  import (
  	"io/ioutil"
  	"strconv"
  	"strings"
  )
  
  // ParseUint32s parses a slice of strings into a slice of uint32s.
  func ParseUint32s(ss []string) ([]uint32, error) {
  	us := make([]uint32, 0, len(ss))
  	for _, s := range ss {
  		u, err := strconv.ParseUint(s, 10, 32)
  		if err != nil {
  			return nil, err
  		}
  
  		us = append(us, uint32(u))
  	}
  
  	return us, nil
  }
  
  // ParseUint64s parses a slice of strings into a slice of uint64s.
  func ParseUint64s(ss []string) ([]uint64, error) {
  	us := make([]uint64, 0, len(ss))
  	for _, s := range ss {
  		u, err := strconv.ParseUint(s, 10, 64)
  		if err != nil {
  			return nil, err
  		}
  
  		us = append(us, u)
  	}
  
  	return us, nil
  }
  
  // ReadUintFromFile reads a file and attempts to parse a uint64 from it.
  func ReadUintFromFile(path string) (uint64, error) {
  	data, err := ioutil.ReadFile(path)
  	if err != nil {
  		return 0, err
  	}
  	return strconv.ParseUint(strings.TrimSpace(string(data)), 10, 64)
  }
  