refactor: try to reduce amount of http2 specific logic

lib/client.js

@@ -74,7 +74,6 @@ const {
   kHTTPConnVersion,
   // HTTP2
   kHost,
-  kHTTP2Session,
   kHTTP2SessionState,
   kHTTP2BuildRequest,
   kHTTP2CopyHeaders,
@@ -279,7 +278,6 @@ class Client extends DispatcherBase {
     this[kHTTPConnVersion] = 'h1'
 
     // HTTP/2
-    this[kHTTP2Session] = null
     this[kHTTP2SessionState] = !allowH2
       ? null
       : {
@@ -397,11 +395,7 @@ class Client extends DispatcherBase {
         resolve()
       }
 
-      if (this[kHTTP2Session] != null) {
-        util.destroy(this[kHTTP2Session], err)
-        this[kHTTP2Session] = null
-        this[kHTTP2SessionState] = null
-      }
+      this[kHTTP2SessionState] = null
 
       if (this[kSocket]) {
         util.destroy(this[kSocket].on('close', callback), err)
@@ -440,7 +434,6 @@ function onHTTP2GoAway (code) {
   const client = this[kClient]
   const err = new InformationalError(`HTTP/2: "GOAWAY" frame received with code ${code}`)
   client[kSocket] = null
-  client[kHTTP2Session] = null
 
   if (client.destroyed) {
     assert(this[kPending] === 0)
@@ -810,7 +803,6 @@ class Parser {
       .removeListener('close', onSocketClose)
 
     client[kSocket] = null
-    client[kHTTP2Session] = null
     client[kQueue][client[kRunningIdx]++] = null
     client.emit('disconnect', client[kUrl], [client], new InformationalError('upgrade'))
 
@@ -1230,17 +1222,14 @@ async function connect (client) {
       })
 
       client[kHTTPConnVersion] = 'h2'
-      session[kClient] = client
-      session[kSocket] = socket
       session.on('error', onHttp2SessionError)
       session.on('frameError', onHttp2FrameError)
       session.on('end', onHttp2SessionEnd)
       session.on('goaway', onHTTP2GoAway)
       session.on('close', onSocketClose)
       session.unref()
 
-      client[kHTTP2Session] = session
-      socket[kHTTP2Session] = session
+      client[kSocket] = session
     } else {
       if (!llhttpInstance) {
         llhttpInstance = await llhttpPromise
@@ -1252,6 +1241,8 @@ async function connect (client) {
       socket[kReset] = false
       socket[kBlocking] = false
       socket[kParser] = new Parser(client, socket, llhttpInstance)
+
+      client[kSocket] = socket
     }
 
     socket[kCounter] = 0
@@ -1265,7 +1256,6 @@ async function connect (client) {
       .on('end', onSocketEnd)
       .on('close', onSocketClose)
 
-    client[kSocket] = socket
 
     if (channels.connected.hasSubscribers) {
       channels.connected.publish({
@@ -1475,7 +1465,7 @@ function shouldSendContentLength (method) {
 
 function write (client, request) {
   if (client[kHTTPConnVersion] === 'h2') {
-    writeH2(client, client[kHTTP2Session], request)
+    writeH2(client, client[kSocket], request)
     return
   }
 
@@ -1853,7 +1843,7 @@ function writeH2 (client, session, request) {
   })
 
   stream.once('error', function (err) {
-    if (client[kHTTP2Session] && !client[kHTTP2Session].destroyed && !this.closed && !this.destroyed) {
+    if (client[kSocket] && !client[kSocket].destroyed && !this.closed && !this.destroyed) {
       h2State.streams -= 1
       util.destroy(stream, err)
     }
@@ -1863,7 +1853,7 @@ function writeH2 (client, session, request) {
     const err = new InformationalError(`HTTP/2: "frameError" received - type ${type}, code ${code}`)
     errorRequest(client, request, err)
 
-    if (client[kHTTP2Session] && !client[kHTTP2Session].destroyed && !this.closed && !this.destroyed) {
+    if (client[kSocket] && !client[kSocket].destroyed && !this.closed && !this.destroyed) {
       h2State.streams -= 1
       util.destroy(stream, err)
     }