/
load.go
149 lines (141 loc) · 3.21 KB
/
load.go
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package fsstorer
import (
"bufio"
"errors"
"io"
"net"
"os"
"path/filepath"
"strconv"
"github.com/Cloud-Foundations/Dominator/lib/fsutil"
"github.com/Cloud-Foundations/Dominator/lib/tags"
)
var zeroIP = IP{}
func readIpList(filename string) ([]IP, error) {
if file, err := os.Open(filename); err != nil {
if os.IsNotExist(err) {
return nil, nil
}
return nil, err
} else {
defer file.Close()
reader := bufio.NewReader(file)
var ipList []IP
for {
var ip IP
if nRead, err := reader.Read(ip[:]); err != nil {
if err == io.EOF {
break
}
return nil, err
} else if nRead != len(ip) {
return nil, errors.New("incomplete read of IP address")
}
ipList = append(ipList, ip)
}
return ipList, nil
}
}
func (s *Storer) load() error {
if err := s.readDirectory(nil, s.topDir); err != nil {
return err
}
for hypervisor, ipAddrs := range s.hypervisorToIPs {
for _, ipAddr := range ipAddrs {
s.ipToHypervisor[ipAddr] = hypervisor
}
}
return nil
}
func (s *Storer) readDirectory(partialIP []byte, dirname string) error {
if len(partialIP) == len(zeroIP) {
filename := filepath.Join(dirname, "ip-list.raw")
if ipList, err := readIpList(filename); err != nil {
return err
} else {
var hyperAddr IP
copy(hyperAddr[:], partialIP)
s.hypervisorToIPs[hyperAddr] = ipList
}
return nil
}
names, err := fsutil.ReadDirnames(dirname, true)
if err != nil {
return err
}
for _, name := range names {
if val, err := strconv.ParseUint(name, 10, 8); err != nil {
continue
} else {
moreIP := make([]byte, len(partialIP), len(partialIP)+1)
copy(moreIP, partialIP)
moreIP = append(moreIP, byte(val))
subdir := filepath.Join(dirname, name)
if err := s.readDirectory(moreIP, subdir); err != nil {
return err
}
}
}
return nil
}
func (s *Storer) readMachineSerialNumber(hypervisor net.IP) (string, error) {
hypervisorIP, err := netIpToIp(hypervisor)
if err != nil {
return "", err
}
dirname := s.getHypervisorDirectory(hypervisorIP)
filename := filepath.Join(dirname, "serial-number")
if file, err := os.Open(filename); err != nil {
if !os.IsNotExist(err) {
return "", err
}
return "", nil
} else {
defer file.Close()
reader := bufio.NewReader(file)
if line, err := reader.ReadString('\n'); err != nil {
return "", err
} else {
return line[:len(line)-1], nil
}
}
}
func (s *Storer) readMachineTags(hypervisor net.IP) (tags.Tags, error) {
hypervisorIP, err := netIpToIp(hypervisor)
if err != nil {
return nil, err
}
dirname := s.getHypervisorDirectory(hypervisorIP)
filename := filepath.Join(dirname, "tags.raw")
if file, err := os.Open(filename); err != nil {
if !os.IsNotExist(err) {
return nil, err
}
return nil, nil
} else {
defer file.Close()
reader := bufio.NewReader(file)
var lastKey string
tgs := make(tags.Tags)
for {
if line, err := reader.ReadString('\n'); err != nil {
if err != io.EOF {
return nil, err
}
if lastKey != "" {
return nil, errors.New("missing value for key: " + lastKey)
}
break
} else {
line = line[:len(line)-1]
if lastKey == "" {
lastKey = line
} else {
tgs[lastKey] = line
lastKey = ""
}
}
}
return tgs, nil
}
}