github.com/rsampaio/docker@v0.7.2-0.20150827203920-fdc73cc3fc31/api/server/exec.go (about)

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