[FAB-2207] Make gossip wait time configurable

Integrate gossip/gossip/algo/pull with peer/core.yaml, so it's wait
time become configurable.

Change-Id: I1661a959b4b771af9c22cb28e1d43c180e98c807
Signed-off-by: Ray Chen <ray@hyperchain.cn>

gossip/gossip/algo/pull.go

@@ -23,6 +23,7 @@ import (
 	"time"
 
 	"github.com/hyperledger/fabric/gossip/util"
+	"github.com/spf13/viper"
 )
 
 /* PullEngine is an object that performs pull-based gossip, and maintains an internal state of items
@@ -47,23 +48,25 @@ func init() {
 	rand.Seed(42)
 }
 
-var digestWaitTime = time.Duration(1) * time.Second
-var requestWaitTime = time.Duration(1) * time.Second
-var responseWaitTime = time.Duration(2) * time.Second
+const (
+	defDigestWaitTime   = time.Duration(1) * time.Second
+	defRequestWaitTime  = time.Duration(1) * time.Second
+	defResponseWaitTime = time.Duration(2) * time.Second
+)
 
 // SetDigestWaitTime sets the digest wait time
 func SetDigestWaitTime(time time.Duration) {
-	digestWaitTime = time
+	viper.Set("peer.gossip.digestWaitTime", time)
 }
 
 // SetRequestWaitTime sets the request wait time
 func SetRequestWaitTime(time time.Duration) {
-	requestWaitTime = time
+	viper.Set("peer.gossip.requestWaitTime", time)
 }
 
 // SetResponseWaitTime sets the response wait time
 func SetResponseWaitTime(time time.Duration) {
-	responseWaitTime = time
+	viper.Set("peer.gossip.responseWaitTime", time)
 }
 
 // PullAdapter is needed by the PullEngine in order to
@@ -179,6 +182,7 @@ func (engine *PullEngine) initiatePull() {
 		engine.Hello(peer, nonce)
 	}
 
+	digestWaitTime := util.GetDurationOrDefault("peer.gossip.digestWaitTime", defDigestWaitTime)
 	time.AfterFunc(digestWaitTime, func() {
 		engine.processIncomingDigests()
 	})
@@ -207,6 +211,7 @@ func (engine *PullEngine) processIncomingDigests() {
 		engine.SendReq(dest, seqsToReq, engine.peers2nonces[dest])
 	}
 
+	responseWaitTime := util.GetDurationOrDefault("peer.gossip.responseWaitTime", defResponseWaitTime)
 	time.AfterFunc(responseWaitTime, engine.endPull)
 
 }
@@ -262,6 +267,8 @@ func (engine *PullEngine) Remove(seqs ...string) {
 // OnHello notifies the engine a hello has arrived
 func (engine *PullEngine) OnHello(nonce uint64, context interface{}) {
 	engine.incomingNONCES.Add(nonce)
+
+	requestWaitTime := util.GetDurationOrDefault("peer.gossip.requestWaitTime", defRequestWaitTime)
 	time.AfterFunc(requestWaitTime, func() {
 		engine.incomingNONCES.Remove(nonce)
 	})

gossip/gossip/algo/pull_test.go

@@ -29,9 +29,9 @@ import (
 )
 
 func init() {
-	requestWaitTime = time.Duration(200) * time.Millisecond
-	digestWaitTime = time.Duration(100) * time.Millisecond
-	responseWaitTime = time.Duration(200) * time.Millisecond
+	SetDigestWaitTime(time.Duration(100) * time.Millisecond)
+	SetRequestWaitTime(time.Duration(200) * time.Millisecond)
+	SetResponseWaitTime(time.Duration(200) * time.Millisecond)
 }
 
 type messageHook func(interface{})

peer/core.yaml

@@ -108,6 +108,12 @@ peer:
         recvBuffSize: 20
         # Buffer size of sending messages
         sendBuffSize: 20
+        # Time to wait before pull engine processes incoming digests (unit: second)
+        digestWaitTime: 1s
+        # Time to wait before pull engine removes incoming nonce (unit: second)
+        requestWaitTime: 1s
+        # Time to wait before pull engine ends pull (unit: second)
+        responseWaitTime: 2s
 
         # This is an endpoint that is published to peers outside of the organization.
         # If this isn't set, the peer will not be known to other organizations.