Simplify IP pool and convert it to host pool

hostPool/hostPool.go

@@ -1,10 +1,12 @@
-package gemini
+package hostPool
 
 import (
 	"sync"
+	"time"
+
+	"gemini-grc/logging"
 )
 
-var ipPool = IpAddressPool{IPs: make(map[string]int)}         //nolint:gochecknoglobals
 var hostPool = HostPool{hostnames: make(map[string]struct{})} //nolint:gochecknoglobals
 
 type HostPool struct {
@@ -30,3 +32,23 @@ func (p *HostPool) Delete(key string) {
 	defer p.Lock.Unlock()
 	delete(p.hostnames, key)
 }
+
+func AddHostToHostPool(key string) {
+	for {
+		// Sleep until the host doesn't exist in pool,
+		// then add it.
+		if hostPool.Get(key) {
+			time.Sleep(1 * time.Second) // Avoid flood-retrying
+			logging.LogInfo("Waiting to add %s to pool...", key)
+		} else {
+			hostPool.Add(key)
+			return
+		}
+	}
+}
+
+func RemoveHostFromHostPool(key string) {
+	if hostPool.Get(key) {
+		hostPool.Delete(key)
+	}
+}