103 lines
2.7 KiB
Go
103 lines
2.7 KiB
Go
package gophercloud
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import (
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"fmt"
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"net/url"
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"path/filepath"
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"strings"
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"time"
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)
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// WaitFor polls a predicate function, once per second, up to a timeout limit.
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// This is useful to wait for a resource to transition to a certain state.
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// To handle situations when the predicate might hang indefinitely, the
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// predicate will be prematurely cancelled after the timeout.
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// Resource packages will wrap this in a more convenient function that's
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// specific to a certain resource, but it can also be useful on its own.
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func WaitFor(timeout int, predicate func() (bool, error)) error {
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type WaitForResult struct {
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Success bool
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Error error
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}
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start := time.Now().Unix()
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for {
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// If a timeout is set, and that's been exceeded, shut it down.
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if timeout >= 0 && time.Now().Unix()-start >= int64(timeout) {
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return fmt.Errorf("A timeout occurred")
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}
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time.Sleep(1 * time.Second)
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var result WaitForResult
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ch := make(chan bool, 1)
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go func() {
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defer close(ch)
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satisfied, err := predicate()
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result.Success = satisfied
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result.Error = err
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}()
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select {
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case <-ch:
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if result.Error != nil {
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return result.Error
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}
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if result.Success {
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return nil
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}
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// If the predicate has not finished by the timeout, cancel it.
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case <-time.After(time.Duration(timeout) * time.Second):
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return fmt.Errorf("A timeout occurred")
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}
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}
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}
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// NormalizeURL is an internal function to be used by provider clients.
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//
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// It ensures that each endpoint URL has a closing `/`, as expected by
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// ServiceClient's methods.
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func NormalizeURL(url string) string {
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if !strings.HasSuffix(url, "/") {
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return url + "/"
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}
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return url
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}
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// NormalizePathURL is used to convert rawPath to a fqdn, using basePath as
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// a reference in the filesystem, if necessary. basePath is assumed to contain
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// either '.' when first used, or the file:// type fqdn of the parent resource.
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// e.g. myFavScript.yaml => file://opt/lib/myFavScript.yaml
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func NormalizePathURL(basePath, rawPath string) (string, error) {
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u, err := url.Parse(rawPath)
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if err != nil {
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return "", err
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}
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// if a scheme is defined, it must be a fqdn already
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if u.Scheme != "" {
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return u.String(), nil
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}
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// if basePath is a url, then child resources are assumed to be relative to it
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bu, err := url.Parse(basePath)
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if err != nil {
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return "", err
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}
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var basePathSys, absPathSys string
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if bu.Scheme != "" {
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basePathSys = filepath.FromSlash(bu.Path)
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absPathSys = filepath.Join(basePathSys, rawPath)
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bu.Path = filepath.ToSlash(absPathSys)
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return bu.String(), nil
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}
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absPathSys = filepath.Join(basePath, rawPath)
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u.Path = filepath.ToSlash(absPathSys)
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if err != nil {
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return "", err
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}
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u.Scheme = "file"
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return u.String(), nil
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}
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