From 78745551c077bf54151202138c2629f288769561 Mon Sep 17 00:00:00 2001
From: Determinant <tederminant@gmail.com>
Date: Tue, 15 Sep 2020 23:55:34 -0400
Subject: WIP: geth-tavum

---
 rpc/subscription.go | 29 ++++++++++++++++-------------
 1 file changed, 16 insertions(+), 13 deletions(-)

(limited to 'rpc/subscription.go')

diff --git a/rpc/subscription.go b/rpc/subscription.go
index c1e869b..233215d 100644
--- a/rpc/subscription.go
+++ b/rpc/subscription.go
@@ -17,7 +17,6 @@
 package rpc
 
 import (
-	"bufio"
 	"container/list"
 	"context"
 	crand "crypto/rand"
@@ -51,10 +50,14 @@ func NewID() ID {
 
 // randomIDGenerator returns a function generates a random IDs.
 func randomIDGenerator() func() ID {
-	seed, err := binary.ReadVarint(bufio.NewReader(crand.Reader))
-	if err != nil {
+	var buf = make([]byte, 8)
+	var seed int64
+	if _, err := crand.Read(buf); err == nil {
+		seed = int64(binary.BigEndian.Uint64(buf))
+	} else {
 		seed = int64(time.Now().Nanosecond())
 	}
+
 	var (
 		mu  sync.Mutex
 		rng = rand.New(rand.NewSource(seed))
@@ -141,7 +144,7 @@ func (n *Notifier) Notify(id ID, data interface{}) error {
 // Closed returns a channel that is closed when the RPC connection is closed.
 // Deprecated: use subscription error channel
 func (n *Notifier) Closed() <-chan interface{} {
-	return n.h.conn.Closed()
+	return n.h.conn.closed()
 }
 
 // takeSubscription returns the subscription (if one has been created). No subscription can
@@ -153,7 +156,7 @@ func (n *Notifier) takeSubscription() *Subscription {
 	return n.sub
 }
 
-// acticate is called after the subscription ID was sent to client. Notifications are
+// activate is called after the subscription ID was sent to client. Notifications are
 // buffered before activation. This prevents notifications being sent to the client before
 // the subscription ID is sent to the client.
 func (n *Notifier) activate() error {
@@ -172,14 +175,14 @@ func (n *Notifier) activate() error {
 func (n *Notifier) send(sub *Subscription, data json.RawMessage) error {
 	params, _ := json.Marshal(&subscriptionResult{ID: string(sub.ID), Result: data})
 	ctx := context.Background()
-	return n.h.conn.Write(ctx, &jsonrpcMessage{
+	return n.h.conn.writeJSON(ctx, &jsonrpcMessage{
 		Version: vsn,
 		Method:  n.namespace + notificationMethodSuffix,
 		Params:  params,
 	})
 }
 
-// A Subscription is created by a notifier and tight to that notifier. The client can use
+// A Subscription is created by a notifier and tied to that notifier. The client can use
 // this subscription to wait for an unsubscribe request for the client, see Err().
 type Subscription struct {
 	ID        ID
@@ -241,11 +244,11 @@ func (sub *ClientSubscription) Err() <-chan error {
 // Unsubscribe unsubscribes the notification and closes the error channel.
 // It can safely be called more than once.
 func (sub *ClientSubscription) Unsubscribe() {
-	sub.quitWithError(nil, true)
+	sub.quitWithError(true, nil)
 	sub.errOnce.Do(func() { close(sub.err) })
 }
 
-func (sub *ClientSubscription) quitWithError(err error, unsubscribeServer bool) {
+func (sub *ClientSubscription) quitWithError(unsubscribeServer bool, err error) {
 	sub.quitOnce.Do(func() {
 		// The dispatch loop won't be able to execute the unsubscribe call
 		// if it is blocked on deliver. Close sub.quit first because it
@@ -276,7 +279,7 @@ func (sub *ClientSubscription) start() {
 	sub.quitWithError(sub.forward())
 }
 
-func (sub *ClientSubscription) forward() (err error, unsubscribeServer bool) {
+func (sub *ClientSubscription) forward() (unsubscribeServer bool, err error) {
 	cases := []reflect.SelectCase{
 		{Dir: reflect.SelectRecv, Chan: reflect.ValueOf(sub.quit)},
 		{Dir: reflect.SelectRecv, Chan: reflect.ValueOf(sub.in)},
@@ -298,14 +301,14 @@ func (sub *ClientSubscription) forward() (err error, unsubscribeServer bool) {
 
 		switch chosen {
 		case 0: // <-sub.quit
-			return nil, false
+			return false, nil
 		case 1: // <-sub.in
 			val, err := sub.unmarshal(recv.Interface().(json.RawMessage))
 			if err != nil {
-				return err, true
+				return true, err
 			}
 			if buffer.Len() == maxClientSubscriptionBuffer {
-				return ErrSubscriptionQueueOverflow, true
+				return true, ErrSubscriptionQueueOverflow
 			}
 			buffer.PushBack(val)
 		case 2: // sub.channel<-
-- 
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