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util.go
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util.go
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package util
import (
"encoding/json"
"errors"
"fmt"
"net/url"
"os"
"regexp"
"sort"
"strings"
"time"
"github.com/google/uuid"
"github.com/hashicorp/go-version"
log "github.com/sirupsen/logrus"
"github.com/spf13/pflag"
)
// Getenv returns environment variable value, if it does not exist, return fallback
func Getenv(key, fallback string) string {
value := os.Getenv(key)
if len(value) == 0 {
return fallback
}
return value
}
func AppendIfMissing[V comparable](slice []V, i V) []V {
for _, ele := range slice {
if ele == i {
return slice
}
}
return append(slice, i)
}
func InSlice(needle string, haystack []string) bool {
stack := make([]string, len(haystack))
copy(stack, haystack)
sort.Strings(stack)
i := sort.Search(
len(stack),
func(i int) bool { return stack[i] >= needle },
)
if i < len(stack) && stack[i] == needle {
return true
}
return false
}
// SearchSlice will search a slice of strings and return all matching results.
// The search can either be case sensitive or not.
func SearchSlice(needle string, haystack []string, caseInsensitive bool) []string {
result := []string{}
searchTerm := needle
if caseInsensitive {
searchTerm = "(?i)" + searchTerm
}
regex := regexp.MustCompile(searchTerm)
for _, s := range haystack {
if regex.MatchString(s) {
result = append(result, s)
}
}
return result
}
func FileExists(name string) (bool, error) {
_, err := os.Stat(name)
if err == nil {
return true, nil
}
if errors.Is(err, os.ErrNotExist) {
return false, nil
}
return false, err
}
func IsJSON(str string) bool {
var js json.RawMessage
return json.Unmarshal([]byte(str), &js) == nil
}
// IsValidURL tests a string to determine if it is a well-structured url or not.
func IsValidURL(addr string) bool {
_, err := url.ParseRequestURI(addr)
if err != nil {
return false
}
u, err := url.Parse(addr)
if err != nil || u.Scheme == "" || u.Host == "" {
return false
}
return true
}
func NormalizeURL(u string) (*url.URL, error) {
if len(u) <= 0 {
return nil, errors.New("no address set")
}
if r := regexp.MustCompile(`^https?://`); !r.MatchString(u) {
u = fmt.Sprintf("https://%s", u)
}
url, err := url.ParseRequestURI(u)
if err != nil {
return nil, err
}
if url.Scheme != "https" {
url.Scheme = "https"
}
return url, nil
}
func ParseFilteringFlags(flags *pflag.FlagSet, defaultFilter map[string]map[string]string) (map[string]map[string]string, []string, bool) {
result := defaultFilter
for v := range result {
if arg, err := flags.GetStringToString(v); err == nil {
if len(arg) > 0 {
for f, value := range arg {
result[v][f] = value
}
}
} else if err != nil {
log.WithError(err).Error("failed to parse filter")
}
}
orderBy, _ := flags.GetStringSlice("order-by")
descending, _ := flags.GetBool("descending")
return result, orderBy, descending
}
func IsUUID(str string) bool {
_, err := uuid.Parse(str)
return err == nil
}
func PrefixStringLines(s, prefixChar string, prefixLength int) string {
split := strings.Split(s, "\n")
for i, l := range split {
if len(l) > 0 {
split[i] = strings.Repeat(string(prefixChar), prefixLength) + l
}
}
return strings.Join(split, "\n")
}
func Reverse[S ~[]T, T any](items S) S {
if len(items) <= 1 {
return items
}
result := make([]T, 0, len(items))
for i := len(items) - 1; i >= 0; i-- {
result = append(result, items[i])
}
return result
}
func ApplianceVersionString(v *version.Version) string {
segments := v.Segments()
res := fmt.Sprintf("%d.%d.%d-%s", segments[0], segments[1], segments[2], v.Metadata())
preString := v.Prerelease()
if len(preString) > 0 {
res = res + "-" + preString
}
return res
}
func DockerTagVersion(v *version.Version) (string, error) {
if envTag := os.Getenv("SDPCTL_DOCKER_TAG"); len(envTag) > 0 {
return envTag, nil
}
if v == nil {
return "", errors.New("DockerTagVersion() - version is nil")
}
segments := v.Segments()
tagVersion := fmt.Sprintf("%d.%d", segments[0], segments[1])
return tagVersion, nil
}
func AddSocketLogHook(path string) error {
stat, err := os.Stat(path)
if err != nil {
return err
}
if stat.Mode().Type() != os.ModeSocket {
return fmt.Errorf("%s is not a unix domain socket", path)
}
formatter := &log.JSONFormatter{
FieldMap: fieldMap,
TimestampFormat: time.RFC3339,
}
hook, err := NewHook("unix", path, log.AllLevels, formatter)
if err != nil {
return err
}
log.AddHook(hook)
return nil
}
func Find[T any](s []T, f func(T) bool) (T, error) {
var r T
for _, v := range s {
if f(v) {
return v, nil
}
}
return r, errors.New("no match in slice")
}