open-consul/consul/util.go

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package consul
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import (
crand "crypto/rand"
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"encoding/binary"
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"fmt"
"math/rand"
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"net"
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"os"
"path/filepath"
"runtime"
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"strconv"
"strings"
"time"
"github.com/hashicorp/serf/serf"
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)
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/*
* Contains an entry for each private block:
* 10.0.0.0/8
* 100.64.0.0/10
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* 172.16.0.0/12
* 192.168/16
*/
var privateBlocks []*net.IPNet
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// serverparts is used to return the parts of a server role
type serverParts struct {
Name string
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Datacenter string
Port int
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Bootstrap bool
Expect int
Version int
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Addr net.Addr
}
func (s *serverParts) String() string {
return fmt.Sprintf("%s (Addr: %s) (DC: %s)", s.Name, s.Addr, s.Datacenter)
}
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func init() {
// Add each private block
privateBlocks = make([]*net.IPNet, 4)
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_, block, err := net.ParseCIDR("10.0.0.0/8")
if err != nil {
panic(fmt.Sprintf("Bad cidr. Got %v", err))
}
privateBlocks[0] = block
_, block, err = net.ParseCIDR("172.16.0.0/12")
if err != nil {
panic(fmt.Sprintf("Bad cidr. Got %v", err))
}
privateBlocks[1] = block
_, block, err = net.ParseCIDR("192.168.0.0/16")
if err != nil {
panic(fmt.Sprintf("Bad cidr. Got %v", err))
}
privateBlocks[2] = block
_, block, err = net.ParseCIDR("100.64.0.0/10")
if err != nil {
panic(fmt.Sprintf("Bad cidr. Got %v", err))
}
privateBlocks[3] = block
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}
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// strContains checks if a list contains a string
func strContains(l []string, s string) bool {
for _, v := range l {
if v == s {
return true
}
}
return false
}
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func ToLowerList(l []string) []string {
var out []string
for _, value := range l {
out = append(out, strings.ToLower(value))
}
return out
}
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// ensurePath is used to make sure a path exists
func ensurePath(path string, dir bool) error {
if !dir {
path = filepath.Dir(path)
}
return os.MkdirAll(path, 0755)
}
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// Returns if a member is a consul server. Returns a bool,
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// the datacenter, and the rpc port
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func isConsulServer(m serf.Member) (bool, *serverParts) {
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if m.Tags["role"] != "consul" {
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return false, nil
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}
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datacenter := m.Tags["dc"]
_, bootstrap := m.Tags["bootstrap"]
expect := 0
expect_str, ok := m.Tags["expect"]
var err error
if ok {
expect, err = strconv.Atoi(expect_str)
if err != nil {
return false, nil
}
}
port_str := m.Tags["port"]
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port, err := strconv.Atoi(port_str)
if err != nil {
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return false, nil
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}
vsn_str := m.Tags["vsn"]
vsn, err := strconv.Atoi(vsn_str)
if err != nil {
return false, nil
}
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addr := &net.TCPAddr{IP: m.Addr, Port: port}
parts := &serverParts{
Name: m.Name,
Datacenter: datacenter,
Port: port,
Bootstrap: bootstrap,
Expect: expect,
Addr: addr,
Version: vsn,
}
return true, parts
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}
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// Returns if a member is a consul node. Returns a boo,
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// and the datacenter.
func isConsulNode(m serf.Member) (bool, string) {
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if m.Tags["role"] != "node" {
return false, ""
}
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return true, m.Tags["dc"]
}
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// Returns if the given IP is in a private block
func isPrivateIP(ip_str string) bool {
ip := net.ParseIP(ip_str)
for _, priv := range privateBlocks {
if priv.Contains(ip) {
return true
}
}
return false
}
// GetPrivateIP is used to return the first private IP address
// associated with an interface on the machine
func GetPrivateIP() (net.IP, error) {
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addresses, err := net.InterfaceAddrs()
if err != nil {
return nil, fmt.Errorf("Failed to get interface addresses: %v", err)
}
return getPrivateIP(addresses)
}
func getPrivateIP(addresses []net.Addr) (net.IP, error) {
var candidates []net.IP
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// Find private IPv4 address
for _, rawAddr := range addresses {
var ip net.IP
switch addr := rawAddr.(type) {
case *net.IPAddr:
ip = addr.IP
case *net.IPNet:
ip = addr.IP
default:
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continue
}
if ip.To4() == nil {
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continue
}
if !isPrivateIP(ip.String()) {
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continue
}
candidates = append(candidates, ip)
}
numIps := len(candidates)
switch numIps {
case 0:
return nil, fmt.Errorf("No private IP address found")
case 1:
return candidates[0], nil
default:
return nil, fmt.Errorf("Multiple private IPs found. Please configure one.")
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}
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}
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// Converts bytes to an integer
func bytesToUint64(b []byte) uint64 {
return binary.BigEndian.Uint64(b)
}
// Converts a uint to a byte slice
func uint64ToBytes(u uint64) []byte {
buf := make([]byte, 8)
binary.BigEndian.PutUint64(buf, u)
return buf
}
// runtimeStats is used to return various runtime information
func runtimeStats() map[string]string {
return map[string]string{
"os": runtime.GOOS,
"arch": runtime.GOARCH,
"version": runtime.Version(),
"max_procs": strconv.FormatInt(int64(runtime.GOMAXPROCS(0)), 10),
"goroutines": strconv.FormatInt(int64(runtime.NumGoroutine()), 10),
"cpu_count": strconv.FormatInt(int64(runtime.NumCPU()), 10),
}
}
// generateUUID is used to generate a random UUID
func generateUUID() string {
buf := make([]byte, 16)
if _, err := crand.Read(buf); err != nil {
panic(fmt.Errorf("failed to read random bytes: %v", err))
}
return fmt.Sprintf("%08x-%04x-%04x-%04x-%12x",
buf[0:4],
buf[4:6],
buf[6:8],
buf[8:10],
buf[10:16])
}
// Returns a random stagger interval between 0 and the duration
func randomStagger(intv time.Duration) time.Duration {
return time.Duration(uint64(rand.Int63()) % uint64(intv))
}