Pass client configuration as an argument

The ClientCommonConf, configuration file path, and server UDP port are
now passed around as arguments instead of being shared between
components as global variables. This allows for multiple clients to
exist in the same process, and allows client.Session to be used as a
library more easily.

client/proxy/proxy_manager.go

@@ -20,17 +20,24 @@ type ProxyManager struct {
 	closed bool
 	mu     sync.RWMutex
 
+	clientCfg config.ClientCommonConf
+
+	// The UDP port that the server is listening on
+	serverUDPPort int
+
 	logPrefix string
 	log.Logger
 }
 
-func NewProxyManager(msgSendCh chan (msg.Message), logPrefix string) *ProxyManager {
+func NewProxyManager(msgSendCh chan (msg.Message), logPrefix string, clientCfg config.ClientCommonConf, serverUDPPort int) *ProxyManager {
 	return &ProxyManager{
-		proxies:   make(map[string]*ProxyWrapper),
-		sendCh:    msgSendCh,
-		closed:    false,
-		logPrefix: logPrefix,
-		Logger:    log.NewPrefixLogger(logPrefix),
+		proxies:       make(map[string]*ProxyWrapper),
+		sendCh:        msgSendCh,
+		closed:        false,
+		clientCfg:     clientCfg,
+		serverUDPPort: serverUDPPort,
+		logPrefix:     logPrefix,
+		Logger:        log.NewPrefixLogger(logPrefix),
 	}
 }
 
@@ -126,7 +133,7 @@ func (pm *ProxyManager) Reload(pxyCfgs map[string]config.ProxyConf) {
 	addPxyNames := make([]string, 0)
 	for name, cfg := range pxyCfgs {
 		if _, ok := pm.proxies[name]; !ok {
-			pxy := NewProxyWrapper(cfg, pm.HandleEvent, pm.logPrefix)
+			pxy := NewProxyWrapper(cfg, pm.clientCfg, pm.HandleEvent, pm.logPrefix, pm.serverUDPPort)
 			pm.proxies[name] = pxy
 			addPxyNames = append(addPxyNames, name)