github.com/hustcat/docker@v1.3.3-0.20160314103604-901c67a8eeab/api/client/logs.go (about)

     1  package client
     2  
     3  import (
     4  	"fmt"
     5  	"io"
     6  
     7  	"golang.org/x/net/context"
     8  
     9  	Cli "github.com/docker/docker/cli"
    10  	flag "github.com/docker/docker/pkg/mflag"
    11  	"github.com/docker/docker/pkg/stdcopy"
    12  	"github.com/docker/engine-api/types"
    13  )
    14  
    15  var validDrivers = map[string]bool{
    16  	"json-file": true,
    17  	"journald":  true,
    18  }
    19  
    20  // CmdLogs fetches the logs of a given container.
    21  //
    22  // docker logs [OPTIONS] CONTAINER
    23  func (cli *DockerCli) CmdLogs(args ...string) error {
    24  	cmd := Cli.Subcmd("logs", []string{"CONTAINER"}, Cli.DockerCommands["logs"].Description, true)
    25  	follow := cmd.Bool([]string{"f", "-follow"}, false, "Follow log output")
    26  	since := cmd.String([]string{"-since"}, "", "Show logs since timestamp")
    27  	times := cmd.Bool([]string{"t", "-timestamps"}, false, "Show timestamps")
    28  	tail := cmd.String([]string{"-tail"}, "all", "Number of lines to show from the end of the logs")
    29  	cmd.Require(flag.Exact, 1)
    30  
    31  	cmd.ParseFlags(args, true)
    32  
    33  	name := cmd.Arg(0)
    34  
    35  	c, err := cli.client.ContainerInspect(name)
    36  	if err != nil {
    37  		return err
    38  	}
    39  
    40  	if !validDrivers[c.HostConfig.LogConfig.Type] {
    41  		return fmt.Errorf("\"logs\" command is supported only for \"json-file\" and \"journald\" logging drivers (got: %s)", c.HostConfig.LogConfig.Type)
    42  	}
    43  
    44  	options := types.ContainerLogsOptions{
    45  		ContainerID: name,
    46  		ShowStdout:  true,
    47  		ShowStderr:  true,
    48  		Since:       *since,
    49  		Timestamps:  *times,
    50  		Follow:      *follow,
    51  		Tail:        *tail,
    52  	}
    53  	responseBody, err := cli.client.ContainerLogs(context.Background(), options)
    54  	if err != nil {
    55  		return err
    56  	}
    57  	defer responseBody.Close()
    58  
    59  	if c.Config.Tty {
    60  		_, err = io.Copy(cli.out, responseBody)
    61  	} else {
    62  		_, err = stdcopy.StdCopy(cli.out, cli.err, responseBody)
    63  	}
    64  	return err
    65  }