18794: Add "arvados-server check" subcommand.

[arvados.git] / sdk / go / health / aggregator.go

diff --git a/sdk/go/health/aggregator.go b/sdk/go/health/aggregator.go
index 23d7e8d431b7ed1160f3fcf8796e5b755d1dd078..ba532dddca7ee108e0af371086a02a71c078f0db 100644 (file)
--- a/sdk/go/health/aggregator.go
+++ b/sdk/go/health/aggregator.go
@@ -8,19 +8,27 @@ import (
        "context"
        "crypto/tls"
        "encoding/json"
+       "errors"
+       "flag"
        "fmt"
+       "io"
        "net/http"
        "net/url"
        "sync"
        "time"
 
+       "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/auth"
+       "git.arvados.org/arvados.git/sdk/go/ctxlog"
+       "github.com/ghodss/yaml"
+       "github.com/sirupsen/logrus"
 )
 
 const defaultTimeout = arvados.Duration(2 * time.Second)
 
-// Aggregator implements http.Handler. It handles "GET /_health/all"
+// Aggregator implements service.Handler. It handles "GET /_health/all"
 // by checking the health of all configured services on the cluster
 // and responding 200 if everything is healthy.
 type Aggregator struct {
@@ -241,3 +249,61 @@ func (agg *Aggregator) checkAuth(req *http.Request) bool {
        }
        return false
 }
+
+var errSilent = errors.New("")
+
+var CheckCommand cmd.Handler = checkCommand{}
+
+type checkCommand struct{}
+
+func (ccmd checkCommand) RunCommand(prog string, args []string, stdin io.Reader, stdout, stderr io.Writer) int {
+       logger := ctxlog.New(stderr, "json", "info")
+       ctx := ctxlog.Context(context.Background(), logger)
+       err := ccmd.run(ctx, prog, args, stdin, stdout, stderr)
+       if err != nil {
+               if err != errSilent {
+                       fmt.Fprintln(stdout, err.Error())
+               }
+               return 1
+       }
+       return 0
+}
+
+func (ccmd checkCommand) run(ctx context.Context, prog string, args []string, stdin io.Reader, stdout, stderr io.Writer) error {
+       flags := flag.NewFlagSet("", flag.ContinueOnError)
+       flags.SetOutput(stderr)
+       loader := config.NewLoader(stdin, ctxlog.New(stderr, "text", "info"))
+       loader.SetupFlags(flags)
+       versionFlag := flags.Bool("version", false, "Write version information to stdout and exit 0")
+       timeout := flags.Duration("timeout", defaultTimeout.Duration(), "Maximum time to wait for health responses")
+       if ok, _ := cmd.ParseFlags(flags, prog, args, "", stderr); !ok {
+               // cmd.ParseFlags already reported the error
+               return errSilent
+       } else if *versionFlag {
+               cmd.Version.RunCommand(prog, args, stdin, stdout, stderr)
+               return nil
+       }
+       cfg, err := loader.Load()
+       if err != nil {
+               return err
+       }
+       cluster, err := cfg.GetCluster("")
+       if err != nil {
+               return err
+       }
+       logger := ctxlog.New(stderr, cluster.SystemLogs.Format, cluster.SystemLogs.LogLevel).WithFields(logrus.Fields{
+               "ClusterID": cluster.ClusterID,
+       })
+       ctx = ctxlog.Context(ctx, logger)
+       agg := Aggregator{Cluster: cluster, timeout: arvados.Duration(*timeout)}
+       resp := agg.ClusterHealth()
+       buf, err := yaml.Marshal(resp)
+       if err != nil {
+               return err
+       }
+       stdout.Write(buf)
+       if resp.Health != "OK" {
+               return fmt.Errorf("health check failed")
+       }
+       return nil
+}