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Merge pull request #975 from nathanleclaire/fix_daemon_avail_check
Fix daemon availability check
This commit is contained in:
commit
fa62544f14
@ -3,23 +3,32 @@ package main
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import (
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"archive/tar"
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"bytes"
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"context"
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"errors"
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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"
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"net/http"
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"net/http/httputil"
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"os"
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"strconv"
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"strings"
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"time"
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)
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var (
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errDockerPingNotOK = errors.New("Docker /_ping did not return OK")
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)
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const (
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dockerSock = "/var/run/docker.sock"
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lgtm = "LGTM"
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httpMagicPort = ":44554" // chosen arbitrarily due to IANA availability -- might change
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bucket = "editionsdiagnostics"
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sessionIDField = "session"
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healthcheckTimeout = 5 * time.Second
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dockerSock = "/var/run/docker.sock"
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dockerPingOK = "LGTM"
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httpMagicPort = ":44554" // chosen arbitrarily due to IANA availability -- might change
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bucket = "editionsdiagnostics"
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sessionIDField = "session"
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)
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var (
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@ -36,14 +45,67 @@ func init() {
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// for cloud editions.
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type HTTPDiagnosticListener struct{}
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// UnixSocketRoundTripper provides a way to make HTTP request to Docker socket
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// directly.
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type UnixSocketRoundTripper struct{}
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// RoundTrip dials the Docker UNIX socket to make a HTTP request.
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func (u UnixSocketRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
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dial, err := net.Dial("unix", dockerSock)
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if err != nil {
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return nil, err
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}
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conn := httputil.NewClientConn(dial, nil)
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defer conn.Close()
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return conn.Do(req)
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}
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// Listen starts the HTTPDiagnosticListener and sets up handlers for its endpoints
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func (h HTTPDiagnosticListener) Listen() {
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http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
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if _, err := os.Stat(dockerSock); os.IsNotExist(err) {
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http.Error(w, "Docker socket not found -- daemon is down", http.StatusServiceUnavailable)
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client := &http.Client{
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Transport: &UnixSocketRoundTripper{},
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}
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req, err := http.NewRequest(http.MethodGet, "/_ping", nil)
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if err != nil {
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http.Error(w, "Error creating HTTP request to talk to Docker", http.StatusInternalServerError)
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return
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}
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if _, err := w.Write([]byte(lgtm)); err != nil {
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ctx, cancel := context.WithTimeout(context.Background(), healthcheckTimeout)
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defer cancel()
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req = req.WithContext(ctx)
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errCh := make(chan error)
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go func() {
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resp, err := client.Do(req)
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if err != nil {
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errCh <- err
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return
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}
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defer resp.Body.Close()
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if resp.StatusCode != http.StatusOK {
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errCh <- errDockerPingNotOK
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return
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}
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errCh <- nil
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}()
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select {
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case err := <-errCh:
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if err != nil {
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http.Error(w, "Docker daemon ping error", http.StatusInternalServerError)
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return
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}
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case <-ctx.Done():
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http.Error(w, "Docker daemon ping timed out", http.StatusServiceUnavailable)
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return
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}
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if _, err := w.Write([]byte(dockerPingOK)); err != nil {
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log.Println("Error writing HTTP success response:", err)
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return
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}
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