dotcloud/docker

package client // import "github.com/docker/docker/client"

import (
    "context"
    "io"
    "net/url"
    "time"

    "github.com/docker/docker/api/types/container"
    timetypes "github.com/docker/docker/api/types/time"
    "github.com/pkg/errors"
)

// ContainerLogs returns the logs generated by a container in an io.ReadCloser.
// It's up to the caller to close the stream.
//
// The stream format on the response will be in one of two formats:
//
// If the container is using a TTY, there is only a single stream (stdout), and
// data is copied directly from the container output stream, no extra
// multiplexing or headers.
//
// If the container is *not* using a TTY, streams for stdout and stderr are
// multiplexed.
// The format of the multiplexed stream is as follows:
//
//    [8]byte{STREAM_TYPE, 0, 0, 0, SIZE1, SIZE2, SIZE3, SIZE4}[]byte{OUTPUT}
//
// STREAM_TYPE can be 1 for stdout and 2 for stderr
//
// SIZE1, SIZE2, SIZE3, and SIZE4 are four bytes of uint32 encoded as big endian.
// This is the size of OUTPUT.
//
// You can use github.com/docker/docker/pkg/stdcopy.StdCopy to demultiplex this
// stream.
func (cli *Client) ContainerLogs(ctx context.Context, container string, options container.LogsOptions) (io.ReadCloser, error) {
    query := url.Values{}
    if options.ShowStdout {
        query.Set("stdout", "1")
    }

    if options.ShowStderr {
        query.Set("stderr", "1")
    }

    if options.Since != "" {
        ts, err := timetypes.GetTimestamp(options.Since, time.Now())
        if err != nil {
            return nil, errors.Wrap(err, `invalid value for "since"`)
        }
        query.Set("since", ts)
    }

    if options.Until != "" {
        ts, err := timetypes.GetTimestamp(options.Until, time.Now())
        if err != nil {
            return nil, errors.Wrap(err, `invalid value for "until"`)
        }
        query.Set("until", ts)
    }

    if options.Timestamps {
        query.Set("timestamps", "1")
    }

    if options.Details {
        query.Set("details", "1")
    }

    if options.Follow {
        query.Set("follow", "1")
    }
    query.Set("tail", options.Tail)

    resp, err := cli.get(ctx, "/containers/"+container+"/logs", query, nil)
    if err != nil {
        return nil, err
    }
    return resp.body, nil
}