github.com/ncdc/docker@v0.10.1-0.20160129113957-6c6729ef5b74/api/client/logs.go (about)

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