moby--moby/pkg/parsers/parsers.go

119 lines
3.2 KiB
Go

// Package parsers provides helper functions to parse and validate different type
// of string. It can be hosts, unix addresses, tcp addresses, filters, kernel
// operating system versions.
package parsers
import (
"fmt"
"strconv"
"strings"
)
// PartParser parses and validates the specified string (data) using the specified template
// e.g. ip:public:private -> 192.168.0.1:80:8000
func PartParser(template, data string) (map[string]string, error) {
// ip:public:private
var (
templateParts = strings.Split(template, ":")
parts = strings.Split(data, ":")
out = make(map[string]string, len(templateParts))
)
if len(parts) != len(templateParts) {
return nil, fmt.Errorf("Invalid format to parse. %s should match template %s", data, template)
}
for i, t := range templateParts {
value := ""
if len(parts) > i {
value = parts[i]
}
out[t] = value
}
return out, nil
}
// ParseKeyValueOpt parses and validates the specified string as a key/value pair (key=value)
func ParseKeyValueOpt(opt string) (string, string, error) {
parts := strings.SplitN(opt, "=", 2)
if len(parts) != 2 {
return "", "", fmt.Errorf("Unable to parse key/value option: %s", opt)
}
return strings.TrimSpace(parts[0]), strings.TrimSpace(parts[1]), nil
}
// ParsePortRange parses and validates the specified string as a port-range (8000-9000)
func ParsePortRange(ports string) (uint64, uint64, error) {
if ports == "" {
return 0, 0, fmt.Errorf("Empty string specified for ports.")
}
if !strings.Contains(ports, "-") {
start, err := strconv.ParseUint(ports, 10, 16)
end := start
return start, end, err
}
parts := strings.Split(ports, "-")
start, err := strconv.ParseUint(parts[0], 10, 16)
if err != nil {
return 0, 0, err
}
end, err := strconv.ParseUint(parts[1], 10, 16)
if err != nil {
return 0, 0, err
}
if end < start {
return 0, 0, fmt.Errorf("Invalid range specified for the Port: %s", ports)
}
return start, end, nil
}
// ParseUintList parses and validates the specified string as the value
// found in some cgroup file (e.g. `cpuset.cpus`, `cpuset.mems`), which could be
// one of the formats below. Note that duplicates are actually allowed in the
// input string. It returns a `map[int]bool` with available elements from `val`
// set to `true`.
// Supported formats:
// 7
// 1-6
// 0,3-4,7,8-10
// 0-0,0,1-7
// 03,1-3 <- this is gonna get parsed as [1,2,3]
// 3,2,1
// 0-2,3,1
func ParseUintList(val string) (map[int]bool, error) {
if val == "" {
return map[int]bool{}, nil
}
availableInts := make(map[int]bool)
split := strings.Split(val, ",")
errInvalidFormat := fmt.Errorf("invalid format: %s", val)
for _, r := range split {
if !strings.Contains(r, "-") {
v, err := strconv.Atoi(r)
if err != nil {
return nil, errInvalidFormat
}
availableInts[v] = true
} else {
split := strings.SplitN(r, "-", 2)
min, err := strconv.Atoi(split[0])
if err != nil {
return nil, errInvalidFormat
}
max, err := strconv.Atoi(split[1])
if err != nil {
return nil, errInvalidFormat
}
if max < min {
return nil, errInvalidFormat
}
for i := min; i <= max; i++ {
availableInts[i] = true
}
}
}
return availableInts, nil
}