76 lines
1.7 KiB
Go
76 lines
1.7 KiB
Go
package getter
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import (
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"fmt"
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"log"
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"net/url"
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"sync"
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gg "github.com/hashicorp/go-getter"
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"github.com/hashicorp/nomad/nomad/structs"
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)
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var (
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// getters is the map of getters suitable for Nomad. It is initialized once
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// and the lock is used to guard access to it.
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getters map[string]gg.Getter
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lock sync.Mutex
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// supported is the set of download schemes supported by Nomad
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supported = []string{"http", "https", "s3"}
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)
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// getClient returns a client that is suitable for Nomad downloading artifacts.
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func getClient(src, dst string) *gg.Client {
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lock.Lock()
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defer lock.Unlock()
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// Return the pre-initialized client
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if getters == nil {
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getters = make(map[string]gg.Getter, len(supported))
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for _, getter := range supported {
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if impl, ok := gg.Getters[getter]; ok {
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getters[getter] = impl
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}
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}
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}
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return &gg.Client{
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Src: src,
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Dst: dst,
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Mode: gg.ClientModeAny,
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Getters: getters,
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}
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}
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// getGetterUrl returns the go-getter URL to download the artifact.
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func getGetterUrl(artifact *structs.TaskArtifact) (string, error) {
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u, err := url.Parse(artifact.GetterSource)
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if err != nil {
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return "", fmt.Errorf("failed to parse source URL %q: %v", artifact.GetterSource, err)
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}
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// Build the url
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q := u.Query()
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for k, v := range artifact.GetterOptions {
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q.Add(k, v)
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}
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u.RawQuery = q.Encode()
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return u.String(), nil
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}
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// GetArtifact downloads an artifact into the specified destination directory.
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func GetArtifact(artifact *structs.TaskArtifact, destDir string, logger *log.Logger) error {
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url, err := getGetterUrl(artifact)
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if err != nil {
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return err
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}
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// Download the artifact
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if err := getClient(url, destDir).Get(); err != nil {
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return err
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}
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return nil
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}
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