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util.go
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/
util.go
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package gophercloud
import (
"context"
"net/url"
"path/filepath"
"reflect"
"strings"
"time"
)
// NormalizePathURL is used to convert rawPath to a fqdn, using basePath as
// a reference in the filesystem, if necessary. basePath is assumed to contain
// either '.' when first used, or the file:// type fqdn of the parent resource.
// e.g. myFavScript.yaml => file://opt/lib/myFavScript.yaml
func NormalizePathURL(basePath, rawPath string) (string, error) {
u, err := url.Parse(rawPath)
if err != nil {
return "", err
}
// if a scheme is defined, it must be a fqdn already
if u.Scheme != "" {
return u.String(), nil
}
// if basePath is a url, then child resources are assumed to be relative to it
bu, err := url.Parse(basePath)
if err != nil {
return "", err
}
var basePathSys, absPathSys string
if bu.Scheme != "" {
basePathSys = filepath.FromSlash(bu.Path)
absPathSys = filepath.Join(basePathSys, rawPath)
bu.Path = filepath.ToSlash(absPathSys)
return bu.String(), nil
}
absPathSys = filepath.Join(basePath, rawPath)
u.Path = filepath.ToSlash(absPathSys)
if err != nil {
return "", err
}
u.Scheme = "file"
return u.String(), nil
}
// NormalizeURL is an internal function to be used by provider clients.
//
// It ensures that each endpoint URL has a closing `/`, as expected by
// ServiceClient's methods.
func NormalizeURL(url string) string {
if !strings.HasSuffix(url, "/") {
return url + "/"
}
return url
}
// RemainingKeys will inspect a struct and compare it to a map. Any struct
// field that does not have a JSON tag that matches a key in the map or
// a matching lower-case field in the map will be returned as an extra.
//
// This is useful for determining the extra fields returned in response bodies
// for resources that can contain an arbitrary or dynamic number of fields.
func RemainingKeys(s interface{}, m map[string]interface{}) (extras map[string]interface{}) {
extras = make(map[string]interface{})
for k, v := range m {
extras[k] = v
}
valueOf := reflect.ValueOf(s)
typeOf := reflect.TypeOf(s)
for i := 0; i < valueOf.NumField(); i++ {
field := typeOf.Field(i)
lowerField := strings.ToLower(field.Name)
delete(extras, lowerField)
if tagValue := field.Tag.Get("json"); tagValue != "" && tagValue != "-" {
delete(extras, tagValue)
}
}
return
}
// WaitFor polls a predicate function, once per second, up to a context cancellation.
// This is useful to wait for a resource to transition to a certain state.
// Resource packages will wrap this in a more convenient function that's
// specific to a certain resource, but it can also be useful on its own.
func WaitFor(ctx context.Context, predicate func(context.Context) (bool, error)) error {
if done, err := predicate(ctx); done || err != nil {
return err
}
ticker := time.NewTicker(1 * time.Second)
defer ticker.Stop()
for {
select {
case <-ticker.C:
if done, err := predicate(ctx); done || err != nil {
return err
}
case <-ctx.Done():
return ctx.Err()
}
}
}