Merge pull request #23284 from yongtang/23211-spf13-cobra-logs

Use spf13/cobra for docker logs
Upstream-commit: 731bae674965a3ae8a300d8e285927f993727bab
Component: engine

components/engine/api/client/container/logs.go

@@ -0,0 +1,88 @@
+package container
+
+import (
+	"fmt"
+	"io"
+
+	"golang.org/x/net/context"
+
+	"github.com/docker/docker/api/client"
+	"github.com/docker/docker/cli"
+	"github.com/docker/docker/pkg/stdcopy"
+	"github.com/docker/engine-api/types"
+	"github.com/spf13/cobra"
+)
+
+var validDrivers = map[string]bool{
+	"json-file": true,
+	"journald":  true,
+}
+
+type logsOptions struct {
+	follow     bool
+	since      string
+	timestamps bool
+	details    bool
+	tail       string
+
+	container string
+}
+
+// NewLogsCommand creats a new cobra.Command for `docker logs`
+func NewLogsCommand(dockerCli *client.DockerCli) *cobra.Command {
+	var opts logsOptions
+
+	cmd := &cobra.Command{
+		Use:   "logs [OPTIONS] CONTAINER",
+		Short: "Fetch the logs of a container",
+		Args:  cli.ExactArgs(1),
+		RunE: func(cmd *cobra.Command, args []string) error {
+			opts.container = args[0]
+			return runLogs(dockerCli, &opts)
+		},
+	}
+	cmd.SetFlagErrorFunc(flagErrorFunc)
+
+	flags := cmd.Flags()
+	flags.BoolVarP(&opts.follow, "follow", "f", false, "Follow log output")
+	flags.StringVar(&opts.since, "since", "", "Show logs since timestamp")
+	flags.BoolVarP(&opts.timestamps, "timestamps", "t", false, "Show timestamps")
+	flags.BoolVar(&opts.details, "details", false, "Show extra details provided to logs")
+	flags.StringVar(&opts.tail, "tail", "all", "Number of lines to show from the end of the logs")
+	return cmd
+}
+
+func runLogs(dockerCli *client.DockerCli, opts *logsOptions) error {
+	ctx := context.Background()
+
+	c, err := dockerCli.Client().ContainerInspect(ctx, opts.container)
+	if err != nil {
+		return err
+	}
+
+	if !validDrivers[c.HostConfig.LogConfig.Type] {
+		return fmt.Errorf("\"logs\" command is supported only for \"json-file\" and \"journald\" logging drivers (got: %s)", c.HostConfig.LogConfig.Type)
+	}
+
+	options := types.ContainerLogsOptions{
+		ShowStdout: true,
+		ShowStderr: true,
+		Since:      opts.since,
+		Timestamps: opts.timestamps,
+		Follow:     opts.follow,
+		Tail:       opts.tail,
+		Details:    opts.details,
+	}
+	responseBody, err := dockerCli.Client().ContainerLogs(ctx, opts.container, options)
+	if err != nil {
+		return err
+	}
+	defer responseBody.Close()
+
+	if c.Config.Tty {
+		_, err = io.Copy(dockerCli.Out(), responseBody)
+	} else {
+		_, err = stdcopy.StdCopy(dockerCli.Out(), dockerCli.Err(), responseBody)
+	}
+	return err
+}