Fix more golint warnings.

[arvados.git] / lib / service / cmd.go

diff --git a/lib/service/cmd.go b/lib/service/cmd.go
index 0391c5a043dd75e6d3cdaa38f6ba31c9c4dec3ca..a81cf505294e0ce1bbc442da3b844d4cb5c5b073 100644 (file)
--- a/lib/service/cmd.go
+++ b/lib/service/cmd.go
@@ -2,7 +2,7 @@
 //
 // SPDX-License-Identifier: Apache-2.0
 
-// package service provides a cmd.Handler that brings up a system service.
+// Package service provides a cmd.Handler that brings up a system service.
 package service
 
 import (
@@ -12,14 +12,15 @@ import (
        "io"
        "net"
        "net/http"
+       "net/url"
        "os"
        "strings"
 
-       "git.curoverse.com/arvados.git/lib/cmd"
-       "git.curoverse.com/arvados.git/lib/config"
-       "git.curoverse.com/arvados.git/sdk/go/arvados"
-       "git.curoverse.com/arvados.git/sdk/go/ctxlog"
-       "git.curoverse.com/arvados.git/sdk/go/httpserver"
+       "git.arvados.org/arvados.git/lib/cmd"
+       "git.arvados.org/arvados.git/lib/config"
+       "git.arvados.org/arvados.git/sdk/go/arvados"
+       "git.arvados.org/arvados.git/sdk/go/ctxlog"
+       "git.arvados.org/arvados.git/sdk/go/httpserver"
        "github.com/coreos/go-systemd/daemon"
        "github.com/prometheus/client_golang/prometheus"
        "github.com/sirupsen/logrus"
@@ -28,6 +29,7 @@ import (
 type Handler interface {
        http.Handler
        CheckHealth() error
+       Done() <-chan struct{}
 }
 
 type NewHandlerFunc func(_ context.Context, _ *arvados.Cluster, token string, registry *prometheus.Registry) Handler
@@ -58,7 +60,7 @@ func (c *command) RunCommand(prog string, args []string, stdin io.Reader, stdout
        var err error
        defer func() {
                if err != nil {
-                       log.WithError(err).Info("exiting")
+                       log.WithError(err).Error("exiting")
                }
        }()
 
@@ -147,9 +149,15 @@ func (c *command) RunCommand(prog string, args []string, stdin io.Reader, stdout
                logger.WithError(err).Errorf("error notifying init daemon")
        }
        go func() {
+               // Shut down server if caller cancels context
                <-ctx.Done()
                srv.Close()
        }()
+       go func() {
+               // Shut down server if handler dies
+               <-handler.Done()
+               srv.Close()
+       }()
        err = srv.Wait()
        if err != nil {
                return 1
@@ -164,23 +172,37 @@ func getListenAddr(svcs arvados.Services, prog arvados.ServiceName, log logrus.F
        if !ok {
                return arvados.URL{}, fmt.Errorf("unknown service name %q", prog)
        }
-       for url := range svc.InternalURLs {
-               if strings.HasPrefix(url.Host, "localhost:") {
-                       return url, nil
+
+       if want := os.Getenv("ARVADOS_SERVICE_INTERNAL_URL"); want == "" {
+       } else if url, err := url.Parse(want); err != nil {
+               return arvados.URL{}, fmt.Errorf("$ARVADOS_SERVICE_INTERNAL_URL (%q): %s", want, err)
+       } else {
+               if url.Path == "" {
+                       url.Path = "/"
                }
+               return arvados.URL(*url), nil
+       }
+
+       errors := []string{}
+       for url := range svc.InternalURLs {
                listener, err := net.Listen("tcp", url.Host)
                if err == nil {
                        listener.Close()
                        return url, nil
                } else if strings.Contains(err.Error(), "cannot assign requested address") {
+                       // If 'Host' specifies a different server than
+                       // the current one, it'll resolve the hostname
+                       // to IP address, and then fail because it
+                       // can't bind an IP address it doesn't own.
                        continue
-               } else if strings.Contains(err.Error(), "address already in use") {
-                       return url, err
                } else {
-                       log.Warn(err)
+                       errors = append(errors, fmt.Sprintf("tried %v, got %v", url, err))
                }
        }
-       return arvados.URL{}, fmt.Errorf("configuration does not enable the %s service on this host", prog)
+       if len(errors) > 0 {
+               return arvados.URL{}, fmt.Errorf("could not enable the %q service on this host: %s", prog, strings.Join(errors, "; "))
+       }
+       return arvados.URL{}, fmt.Errorf("configuration does not enable the %q service on this host", prog)
 }
 
 type contextKeyURL struct{}