github.com/goern/docker@v1.9.0-rc1/api/server/router/local/exec.go (about)

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