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Making more robust in case ping fails.

master
Uriel Fanelli 2023-08-14 11:52:07 +02:00
parent d480b2fe15
commit 1991b9183b
2 changed files with 128 additions and 18 deletions
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81
interface.go
View File

@ -111,12 +111,29 @@ func (b *AbstractBridge) removeIPandBridgeInt() {
}
func isActive(bridgeip string) bool {
func (b *AbstractBridge) IsActive() bool {
defer func() {
if r := recover(); r != nil {
fmt.Println("An error happened in <WriteNumberToMulticast()>, but Zoreide recovered. ")
fmt.Println("Error was: ", r)
}
}()
var bridgeip string
brIp, _, err := net.ParseCIDR(b.BridgeIpCIDR)
if err != nil {
log.Println("IsActive : problem parsing the IP/CIDR: ", err.Error())
} else {
bridgeip = brIp.String()
}
log.Println("Check for active IP: ", bridgeip)
pinger, err := ping.NewPinger(bridgeip)
if err != nil {
log.Println("Unable to ping address: ", bridgeip)
log.Println("Ping error: " + err.Error())
}
// just in case it doesn't stops alone
@ -133,3 +150,65 @@ func isActive(bridgeip string) bool {
return stats.PacketsRecv == pinger.Count
}
func (b *AbstractBridge) IsAssigned() bool {
// we want the program to recover in case of issues
defer func() {
if r := recover(); r != nil {
fmt.Println("An error happened in <IsAssigned()>, but Zoreide recovered. ")
fmt.Println("Error was: ", r)
}
}()
var (
ief *net.Interface
addrs []net.Addr
ipv4Addr net.IP
err error
bridgeip string
)
brIp, _, err := net.ParseCIDR(b.BridgeIpCIDR)
if err != nil {
log.Println("IsActive : problem parsing the IP/CIDR: ", err.Error())
return false
} else {
bridgeip = brIp.String()
}
interfaceName := b.ExistingInterface
if ief, err = net.InterfaceByName(interfaceName); err != nil { // get interface
log.Printf("Interface %s does not exist or not manageable\n", interfaceName)
log.Printf("Error is: %s\n", err.Error())
return false
}
if addrs, err = ief.Addrs(); err != nil { // get addresses
log.Printf("Cannot read IPs of interface %s\n", interfaceName)
log.Printf("Error is: %s\n", err.Error())
return false
}
for _, addr := range addrs { // get ipv4 address
if ipv4Addr = addr.(*net.IPNet).IP.To4(); ipv4Addr != nil {
log.Printf("Error reading IPs for interface %s\n", interfaceName)
log.Printf("Error is: %s\n", err.Error())
break
}
}
if ipv4Addr == nil {
log.Printf("interface %s don't have an ipv4 address\n", interfaceName)
return false
}
for _, addr := range addrs {
if addr.String() == bridgeip {
log.Printf("Ip %s is assigned to interface %s", bridgeip, interfaceName)
return true
}
}
log.Printf("Ip %s is NOT assigned to interface %s", bridgeip, interfaceName)
return false
}

65
orchestrator.go
View File

@ -3,7 +3,6 @@ package main
import (
"fmt"
"log"
"net"
"regexp"
"slices"
"strconv"
@ -55,6 +54,13 @@ func (mip *AbstractMulticast) WriteNumberToMulticast(br AbstractBridge) {
func (mip *AbstractMulticast) ReadNumberFromMulticast() {
defer func() {
if r := recover(); r != nil {
fmt.Println("An error happened in <ReadNumberToMulticast()>, but Zoreide recovered. ")
fmt.Println("Error was: ", r)
}
}()
log.Println("Initiating reader")
buffer := make([]byte, mip.MaxDatagramSize)
@ -74,6 +80,13 @@ func (mip *AbstractMulticast) ReadNumberFromMulticast() {
func (b *AbstractBridge) HierarchyReLocator(entity AbstractMulticast) {
defer func() {
if r := recover(); r != nil {
fmt.Println("An error happened in <HierarchyLocator()>, but Zoreide recovered. ")
fmt.Println("Error was: ", r)
}
}()
log.Println("Inizializing HierarchyManager")
entity.AddUniqueAndSort(b.hIerarchyNumber)
@ -101,26 +114,26 @@ func (b *AbstractBridge) HierarchyReLocator(entity AbstractMulticast) {
entity.AddUniqueAndSort(brdNumber)
}
brIp, _, err := net.ParseCIDR(b.BridgeIpCIDR)
if err != nil {
log.Println(err.Error())
}
// finished feeding the new number
// if Alpha:
if entity.IsAlpha(b.hIerarchyNumber) {
if isActive(brIp.String()) {
if b.IsAssigned() {
log.Println("Still ALPHA. This is ok.")
} else {
log.Println("I'm the new ALPHA! Get out my path, losers!")
b.configureIpAndBridgeUp()
log.Println("Ip is active: ", isActive(brIp.String()))
log.Println("Ip is active: ", b.IsActive())
}
// here we manage the case when we are not alpha
} else {
log.Println("GULP! There is a bigger one, better descalating")
if isActive(brIp.String()) {
if b.IsAssigned() {
log.Println("Start removing the IP from the interface:")
b.removeIPandBridgeInt()
log.Println("Removed.Ip is reachable: ", b.IsActive())
} else {
log.Println("Nothing to do, since IP is not assigned to the interface: ", b.ExistingInterface)
log.Println("Ip is reachable: ", b.IsActive())
}
}
@ -130,22 +143,40 @@ func (b *AbstractBridge) HierarchyReLocator(entity AbstractMulticast) {
func (b *AbstractBridge) WaitAndClean(entity AbstractMulticast) {
log.Println("Inizializing HAManager")
defer func() {
if r := recover(); r != nil {
fmt.Println("An error happened in <WaitAndClean()>, but Zoreide recovered. ")
fmt.Println("Error was: ", r)
}
}()
brIp, _, err := net.ParseCIDR(b.BridgeIpCIDR)
if err != nil {
log.Println(err.Error())
}
log.Println("Inizializing HA-Manager")
for {
pollTime := len(entity.HierarchyArray) + 1
time.Sleep(time.Duration(pollTime) * time.Second)
// svuotare l'array e rifare le elezioni
if !isActive(string(brIp.String())) {
// Evitiamo di avere l'IP senza essere alpha
if b.IsAssigned() {
if entity.IsAlpha(b.hIerarchyNumber) {
log.Println("We are alpha and IP is assigned. All ok")
} else {
log.Println("Cannot have IP assigned without being alpha")
log.Println("Inconsistent situation: start removing the IP from the interface:")
b.removeIPandBridgeInt()
log.Println("Removed.Ip is still reachable: ", b.IsActive())
}
}
if b.IsActive() {
log.Println("Ip reachable, cluster OK")
continue
} else {
log.Println("Situation non consistent, restart from green field.")
entity.HierarchyArray = entity.HierarchyArray[:0]
entity.HierarchyArray = slices.Clip(entity.HierarchyArray)
entity.AddUniqueAndSort(b.hIerarchyNumber)
log.Println("Restarted from green field: ", entity.HierarchyArray)
}
}