74 lines
1.8 KiB
Go
74 lines
1.8 KiB
Go
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package checks
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import (
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"errors"
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"fmt"
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"net"
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"net/http"
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"os"
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"path/filepath"
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"strconv"
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"time"
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"github.com/docker/distribution/health"
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)
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// FileChecker checks the existence of a file and returns an error
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// if the file exists.
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func FileChecker(f string) health.Checker {
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return health.CheckFunc(func() error {
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absoluteFilePath, err := filepath.Abs(f)
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if err != nil {
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return fmt.Errorf("failed to get absolute path for %q: %v", f, err)
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}
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_, err = os.Stat(absoluteFilePath)
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if err == nil {
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return errors.New("file exists")
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} else if os.IsNotExist(err) {
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return nil
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}
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return err
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})
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}
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// HTTPChecker does a HEAD request and verifies that the HTTP status code
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// returned matches statusCode.
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func HTTPChecker(r string, statusCode int, timeout time.Duration, headers http.Header) health.Checker {
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return health.CheckFunc(func() error {
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client := http.Client{
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Timeout: timeout,
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}
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req, err := http.NewRequest("HEAD", r, nil)
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if err != nil {
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return errors.New("error creating request: " + r)
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}
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for headerName, headerValues := range headers {
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for _, headerValue := range headerValues {
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req.Header.Add(headerName, headerValue)
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}
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}
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response, err := client.Do(req)
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if err != nil {
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return errors.New("error while checking: " + r)
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}
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if response.StatusCode != statusCode {
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return errors.New("downstream service returned unexpected status: " + strconv.Itoa(response.StatusCode))
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}
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return nil
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})
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}
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// TCPChecker attempts to open a TCP connection.
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func TCPChecker(addr string, timeout time.Duration) health.Checker {
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return health.CheckFunc(func() error {
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conn, err := net.DialTimeout("tcp", addr, timeout)
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if err != nil {
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return errors.New("connection to " + addr + " failed")
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}
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conn.Close()
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return nil
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})
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}
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