github.com/ncdc/docker@v0.10.1-0.20160129113957-6c6729ef5b74/api/server/router/container/exec.go (about)

     1  package container
     2  
     3  import (
     4  	"encoding/json"
     5  	"fmt"
     6  	"io"
     7  	"net/http"
     8  	"strconv"
     9  
    10  	"github.com/Sirupsen/logrus"
    11  	"github.com/docker/docker/api/server/httputils"
    12  	"github.com/docker/docker/pkg/stdcopy"
    13  	"github.com/docker/docker/utils"
    14  	"github.com/docker/engine-api/types"
    15  	"golang.org/x/net/context"
    16  )
    17  
    18  func (s *containerRouter) getExecByID(ctx context.Context, w http.ResponseWriter, r *http.Request, vars map[string]string) error {
    19  	eConfig, err := s.backend.ContainerExecInspect(vars["id"])
    20  	if err != nil {
    21  		return err
    22  	}
    23  
    24  	return httputils.WriteJSON(w, http.StatusOK, eConfig)
    25  }
    26  
    27  func (s *containerRouter) postContainerExecCreate(ctx context.Context, w http.ResponseWriter, r *http.Request, vars map[string]string) error {
    28  	if err := httputils.ParseForm(r); err != nil {
    29  		return err
    30  	}
    31  	if err := httputils.CheckForJSON(r); err != nil {
    32  		return err
    33  	}
    34  	name := vars["name"]
    35  
    36  	execConfig := &types.ExecConfig{}
    37  	if err := json.NewDecoder(r.Body).Decode(execConfig); err != nil {
    38  		return err
    39  	}
    40  	execConfig.Container = name
    41  
    42  	if len(execConfig.Cmd) == 0 {
    43  		return fmt.Errorf("No exec command specified")
    44  	}
    45  
    46  	// Register an instance of Exec in container.
    47  	id, err := s.backend.ContainerExecCreate(execConfig)
    48  	if err != nil {
    49  		logrus.Errorf("Error setting up exec command in container %s: %s", name, utils.GetErrorMessage(err))
    50  		return err
    51  	}
    52  
    53  	return httputils.WriteJSON(w, http.StatusCreated, &types.ContainerExecCreateResponse{
    54  		ID: id,
    55  	})
    56  }
    57  
    58  // TODO(vishh): Refactor the code to avoid having to specify stream config as part of both create and start.
    59  func (s *containerRouter) postContainerExecStart(ctx context.Context, w http.ResponseWriter, r *http.Request, vars map[string]string) error {
    60  	if err := httputils.ParseForm(r); err != nil {
    61  		return err
    62  	}
    63  
    64  	version := httputils.VersionFromContext(ctx)
    65  	if version.GreaterThan("1.21") {
    66  		if err := httputils.CheckForJSON(r); err != nil {
    67  			return err
    68  		}
    69  	}
    70  
    71  	var (
    72  		execName                  = vars["name"]
    73  		stdin, inStream           io.ReadCloser
    74  		stdout, stderr, outStream io.Writer
    75  	)
    76  
    77  	execStartCheck := &types.ExecStartCheck{}
    78  	if err := json.NewDecoder(r.Body).Decode(execStartCheck); err != nil {
    79  		return err
    80  	}
    81  
    82  	if exists, err := s.backend.ExecExists(execName); !exists {
    83  		return err
    84  	}
    85  
    86  	if !execStartCheck.Detach {
    87  		var err error
    88  		// Setting up the streaming http interface.
    89  		inStream, outStream, err = httputils.HijackConnection(w)
    90  		if err != nil {
    91  			return err
    92  		}
    93  		defer httputils.CloseStreams(inStream, outStream)
    94  
    95  		if _, ok := r.Header["Upgrade"]; ok {
    96  			fmt.Fprintf(outStream, "HTTP/1.1 101 UPGRADED\r\nContent-Type: application/vnd.docker.raw-stream\r\nConnection: Upgrade\r\nUpgrade: tcp\r\n\r\n")
    97  		} else {
    98  			fmt.Fprintf(outStream, "HTTP/1.1 200 OK\r\nContent-Type: application/vnd.docker.raw-stream\r\n\r\n")
    99  		}
   100  
   101  		stdin = inStream
   102  		stdout = outStream
   103  		if !execStartCheck.Tty {
   104  			stderr = stdcopy.NewStdWriter(outStream, stdcopy.Stderr)
   105  			stdout = stdcopy.NewStdWriter(outStream, stdcopy.Stdout)
   106  		}
   107  	} else {
   108  		outStream = w
   109  	}
   110  
   111  	// Now run the user process in container.
   112  	if err := s.backend.ContainerExecStart(execName, stdin, stdout, stderr); err != nil {
   113  		if execStartCheck.Detach {
   114  			return err
   115  		}
   116  		logrus.Errorf("Error running exec in container: %v\n", utils.GetErrorMessage(err))
   117  	}
   118  	return nil
   119  }
   120  
   121  func (s *containerRouter) postContainerExecResize(ctx context.Context, w http.ResponseWriter, r *http.Request, vars map[string]string) error {
   122  	if err := httputils.ParseForm(r); err != nil {
   123  		return err
   124  	}
   125  	height, err := strconv.Atoi(r.Form.Get("h"))
   126  	if err != nil {
   127  		return err
   128  	}
   129  	width, err := strconv.Atoi(r.Form.Get("w"))
   130  	if err != nil {
   131  		return err
   132  	}
   133  
   134  	return s.backend.ContainerExecResize(vars["name"], height, width)
   135  }