Added load balancer (wip)

+ Added support for multiple upstreams
+ Added load balancer
+ Added upstream abstraction in endpoint
+ Added load balancer structure
+ Added breaking change auto-updater
+ Added uptime monitor proxy type definitions
+ Added upstream editor UI
+ Fixed charset bug in many snippets HTML files

src/mod/dynamicproxy/router.go

@@ -2,6 +2,7 @@ package dynamicproxy
 
 import (
 	"errors"
+	"log"
 	"net/url"
 	"strings"
 
@@ -17,41 +18,18 @@ import (
 
 // Prepare proxy route generate a proxy handler service object for your endpoint
 func (router *Router) PrepareProxyRoute(endpoint *ProxyEndpoint) (*ProxyEndpoint, error) {
-	//Filter the tailing slash if any
-	domain := endpoint.Domain
-	if len(domain) == 0 {
-		return nil, errors.New("invalid endpoint config")
-	}
-	if domain[len(domain)-1:] == "/" {
-		domain = domain[:len(domain)-1]
-	}
-	endpoint.Domain = domain
-
-	//Parse the web proxy endpoint
-	webProxyEndpoint := domain
-	if !strings.HasPrefix("http://", domain) && !strings.HasPrefix("https://", domain) {
-		//TLS is not hardcoded in proxy target domain
-		if endpoint.RequireTLS {
-			webProxyEndpoint = "https://" + webProxyEndpoint
-		} else {
-			webProxyEndpoint = "http://" + webProxyEndpoint
+	for _, thisOrigin := range endpoint.ActiveOrigins {
+		//Create the proxy routing handler
+		err := thisOrigin.StartProxy()
+		if err != nil {
+			log.Println("Unable to setup upstream " + thisOrigin.OriginIpOrDomain + ": " + err.Error())
+			continue
 		}
 	}
 
-	//Create a new proxy agent for this root
-	path, err := url.Parse(webProxyEndpoint)
-	if err != nil {
-		return nil, err
-	}
-
-	//Create the proxy routing handler
-	proxy := dpcore.NewDynamicProxyCore(path, "", &dpcore.DpcoreOptions{
-		IgnoreTLSVerification: endpoint.SkipCertValidations,
-	})
-	endpoint.proxy = proxy
 	endpoint.parent = router
 
-	//Prepare proxy routing hjandler for each of the virtual directories
+	//Prepare proxy routing handler for each of the virtual directories
 	for _, vdir := range endpoint.VirtualDirectories {
 		domain := vdir.Domain
 		if len(domain) == 0 {
@@ -63,7 +41,7 @@ func (router *Router) PrepareProxyRoute(endpoint *ProxyEndpoint) (*ProxyEndpoint
 		}
 
 		//Parse the web proxy endpoint
-		webProxyEndpoint = domain
+		webProxyEndpoint := domain
 		if !strings.HasPrefix("http://", domain) && !strings.HasPrefix("https://", domain) {
 			//TLS is not hardcoded in proxy target domain
 			if vdir.RequireTLS {
@@ -90,7 +68,7 @@ func (router *Router) PrepareProxyRoute(endpoint *ProxyEndpoint) (*ProxyEndpoint
 
 // Add Proxy Route to current runtime. Call to PrepareProxyRoute before adding to runtime
 func (router *Router) AddProxyRouteToRuntime(endpoint *ProxyEndpoint) error {
-	if endpoint.proxy == nil {
+	if !router.loadBalancer.UpstreamsReady(endpoint.ActiveOrigins) {
 		//This endpoint is not prepared
 		return errors.New("proxy endpoint not ready. Use PrepareProxyRoute before adding to runtime")
 	}
@@ -101,7 +79,7 @@ func (router *Router) AddProxyRouteToRuntime(endpoint *ProxyEndpoint) error {
 
 // Set given Proxy Route as Root. Call to PrepareProxyRoute before adding to runtime
 func (router *Router) SetProxyRouteAsRoot(endpoint *ProxyEndpoint) error {
-	if endpoint.proxy == nil {
+	if !router.loadBalancer.UpstreamsReady(endpoint.ActiveOrigins) {
 		//This endpoint is not prepared
 		return errors.New("proxy endpoint not ready. Use PrepareProxyRoute before adding to runtime")
 	}