github.com/ttys3/engine@v17.12.1-ce-rc2+incompatible/pkg/parsers/parsers.go (about)

     1  // Package parsers provides helper functions to parse and validate different type
     2  // of string. It can be hosts, unix addresses, tcp addresses, filters, kernel
     3  // operating system versions.
     4  package parsers
     5  
     6  import (
     7  	"fmt"
     8  	"strconv"
     9  	"strings"
    10  )
    11  
    12  // ParseKeyValueOpt parses and validates the specified string as a key/value pair (key=value)
    13  func ParseKeyValueOpt(opt string) (string, string, error) {
    14  	parts := strings.SplitN(opt, "=", 2)
    15  	if len(parts) != 2 {
    16  		return "", "", fmt.Errorf("Unable to parse key/value option: %s", opt)
    17  	}
    18  	return strings.TrimSpace(parts[0]), strings.TrimSpace(parts[1]), nil
    19  }
    20  
    21  // ParseUintList parses and validates the specified string as the value
    22  // found in some cgroup file (e.g. `cpuset.cpus`, `cpuset.mems`), which could be
    23  // one of the formats below. Note that duplicates are actually allowed in the
    24  // input string. It returns a `map[int]bool` with available elements from `val`
    25  // set to `true`.
    26  // Supported formats:
    27  //     7
    28  //     1-6
    29  //     0,3-4,7,8-10
    30  //     0-0,0,1-7
    31  //     03,1-3      <- this is gonna get parsed as [1,2,3]
    32  //     3,2,1
    33  //     0-2,3,1
    34  func ParseUintList(val string) (map[int]bool, error) {
    35  	if val == "" {
    36  		return map[int]bool{}, nil
    37  	}
    38  
    39  	availableInts := make(map[int]bool)
    40  	split := strings.Split(val, ",")
    41  	errInvalidFormat := fmt.Errorf("invalid format: %s", val)
    42  
    43  	for _, r := range split {
    44  		if !strings.Contains(r, "-") {
    45  			v, err := strconv.Atoi(r)
    46  			if err != nil {
    47  				return nil, errInvalidFormat
    48  			}
    49  			availableInts[v] = true
    50  		} else {
    51  			split := strings.SplitN(r, "-", 2)
    52  			min, err := strconv.Atoi(split[0])
    53  			if err != nil {
    54  				return nil, errInvalidFormat
    55  			}
    56  			max, err := strconv.Atoi(split[1])
    57  			if err != nil {
    58  				return nil, errInvalidFormat
    59  			}
    60  			if max < min {
    61  				return nil, errInvalidFormat
    62  			}
    63  			for i := min; i <= max; i++ {
    64  				availableInts[i] = true
    65  			}
    66  		}
    67  	}
    68  	return availableInts, nil
    69  }