forked from mystiq/dex
120 lines
2.7 KiB
Go
120 lines
2.7 KiB
Go
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package testserver
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import (
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"fmt"
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"io"
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"io/ioutil"
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"log"
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"net/http"
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"os"
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"path/filepath"
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"runtime"
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"strings"
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"time"
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)
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const (
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awsBaseURL = "https://s3.amazonaws.com/cockroach/cockroach"
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latestSuffix = "LATEST"
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localBinaryPath = "/var/tmp"
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finishedFileMode = 0555
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)
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func binaryName() string {
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return fmt.Sprintf("cockroach.%s-%s", runtime.GOOS, runtime.GOARCH)
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}
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func binaryNameWithSha(sha string) string {
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return fmt.Sprintf("%s.%s", binaryName(), sha)
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}
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func binaryPath(sha string) string {
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return filepath.Join(localBinaryPath, binaryNameWithSha(sha))
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}
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func latestMarkerURL() string {
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return fmt.Sprintf("%s/%s.%s", awsBaseURL, binaryName(), latestSuffix)
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}
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func binaryURL(sha string) string {
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return fmt.Sprintf("%s/%s.%s", awsBaseURL, binaryName(), sha)
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}
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func findLatestSha() (string, error) {
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markerURL := latestMarkerURL()
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marker, err := http.Get(markerURL)
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if err != nil {
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return "", fmt.Errorf("could not download %s: %s", markerURL)
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}
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if marker.StatusCode == 404 {
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return "", fmt.Errorf("for 404 from GET %s: make sure OS and ARCH are supported",
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markerURL)
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} else if marker.StatusCode != 200 {
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return "", fmt.Errorf("bad response got GET %s: %d (%s)",
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markerURL, marker.StatusCode, marker.Status)
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}
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defer marker.Body.Close()
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body, err := ioutil.ReadAll(marker.Body)
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if err != nil {
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return "", err
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}
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return strings.TrimSpace(string(body)), nil
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}
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func downloadFile(url, filePath string) error {
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output, err := os.OpenFile(filePath, os.O_WRONLY|os.O_CREATE|os.O_EXCL, 0200)
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if err != nil {
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return fmt.Errorf("error creating %s: %s", filePath, "-", err)
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}
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defer output.Close()
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log.Printf("downloading %s to %s, this may take some time", url, filePath)
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response, err := http.Get(url)
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if err != nil {
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return fmt.Errorf("error downloading %s: %s", url, err)
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}
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defer response.Body.Close()
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if response.StatusCode != 200 {
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return fmt.Errorf("error downloading %s: %d (%s)", url, response.StatusCode, response.Status)
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}
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_, err = io.Copy(output, response.Body)
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if err != nil {
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return fmt.Errorf("problem downloading %s to %s: %s", url, filePath, err)
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}
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// Download was successful, add the rw bits.
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return os.Chmod(filePath, finishedFileMode)
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}
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func downloadLatestBinary() (string, error) {
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sha, err := findLatestSha()
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if err != nil {
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return "", err
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}
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localFile := binaryPath(sha)
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for {
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finfo, err := os.Stat(localFile)
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if err != nil {
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// File does not exist: download it.
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break
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}
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// File already present: check mode.
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if finfo.Mode().Perm() == finishedFileMode {
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return localFile, nil
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}
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time.Sleep(time.Millisecond * 10)
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}
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err = downloadFile(binaryURL(sha), localFile)
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if err != nil {
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_ = os.Remove(localFile)
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return "", err
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}
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return localFile, nil
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}
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