github.com/coreos/mantle@v0.13.0/platform/local/cluster.go (about)

     1  // Copyright 2015 CoreOS, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package local
    16  
    17  import (
    18  	"fmt"
    19  	"math/rand"
    20  	"net"
    21  	"net/http"
    22  	"net/url"
    23  	"strconv"
    24  	"strings"
    25  
    26  	"github.com/vishvananda/netlink"
    27  	"github.com/vishvananda/netns"
    28  
    29  	"github.com/coreos/mantle/lang/destructor"
    30  	"github.com/coreos/mantle/network"
    31  	"github.com/coreos/mantle/platform"
    32  	"github.com/coreos/mantle/system/exec"
    33  	"github.com/coreos/mantle/system/ns"
    34  )
    35  
    36  type LocalCluster struct {
    37  	destructor.MultiDestructor
    38  	*platform.BaseCluster
    39  	flight      *LocalFlight
    40  	OmahaServer OmahaWrapper
    41  }
    42  
    43  func (lc *LocalCluster) NewCommand(name string, arg ...string) exec.Cmd {
    44  	cmd := ns.Command(lc.flight.nshandle, name, arg...)
    45  	return cmd
    46  }
    47  
    48  func (lc *LocalCluster) hostIP() string {
    49  	// hackydoo
    50  	bridge := "br0"
    51  	for _, seg := range lc.flight.Dnsmasq.Segments {
    52  		if bridge == seg.BridgeName {
    53  			return seg.BridgeIf.DHCPv4[0].IP.String()
    54  		}
    55  	}
    56  	panic("Not a valid bridge!")
    57  }
    58  
    59  func (lc *LocalCluster) etcdEndpoint() string {
    60  	return fmt.Sprintf("http://%s:%d", lc.hostIP(), lc.flight.SimpleEtcd.Port)
    61  }
    62  
    63  func (lc *LocalCluster) GetDiscoveryURL(size int) (string, error) {
    64  	baseURL := fmt.Sprintf("%v/v2/keys/discovery/%v", lc.etcdEndpoint(), rand.Int())
    65  
    66  	nsDialer := network.NewNsDialer(lc.flight.nshandle)
    67  	tr := &http.Transport{
    68  		Dial: nsDialer.Dial,
    69  	}
    70  	client := &http.Client{Transport: tr}
    71  
    72  	body := strings.NewReader(url.Values{"value": {strconv.Itoa(size)}}.Encode())
    73  	req, err := http.NewRequest("PUT", baseURL+"/_config/size", body)
    74  	if err != nil {
    75  		return "", fmt.Errorf("setting discovery url failed: %v\n", err)
    76  	}
    77  	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
    78  
    79  	resp, err := client.Do(req)
    80  	if err != nil {
    81  		return "", fmt.Errorf("setting discovery url failed: %v\n", err)
    82  	}
    83  	defer resp.Body.Close()
    84  
    85  	return baseURL, nil
    86  }
    87  
    88  func (lc *LocalCluster) GetOmahaHostPort() (string, error) {
    89  	_, port, err := net.SplitHostPort(lc.OmahaServer.Addr().String())
    90  	if err != nil {
    91  		return "", err
    92  	}
    93  	return net.JoinHostPort(lc.hostIP(), port), nil
    94  }
    95  
    96  func (lc *LocalCluster) NewTap(bridge string) (*TunTap, error) {
    97  	nsExit, err := ns.Enter(lc.flight.nshandle)
    98  	if err != nil {
    99  		return nil, err
   100  	}
   101  	defer nsExit()
   102  
   103  	tap, err := AddLinkTap("")
   104  	if err != nil {
   105  		return nil, fmt.Errorf("tap failed: %v", err)
   106  	}
   107  
   108  	err = netlink.LinkSetUp(tap)
   109  	if err != nil {
   110  		return nil, fmt.Errorf("tap up failed: %v", err)
   111  	}
   112  
   113  	br, err := netlink.LinkByName(bridge)
   114  	if err != nil {
   115  		return nil, fmt.Errorf("bridge failed: %v", err)
   116  	}
   117  
   118  	err = netlink.LinkSetMaster(tap, br.(*netlink.Bridge))
   119  	if err != nil {
   120  		return nil, fmt.Errorf("set master failed: %v", err)
   121  	}
   122  
   123  	return tap, nil
   124  }
   125  
   126  func (lc *LocalCluster) GetNsHandle() netns.NsHandle {
   127  	return lc.flight.nshandle
   128  }
   129  
   130  func (lc *LocalCluster) Destroy() {
   131  	// does not lc.flight.DelCluster() since we are not the top-level object
   132  	lc.MultiDestructor.Destroy()
   133  }