[FAB-5848] Identity Pull formatting

This change set makes identity digests be printed not in gibberish

This is how they are printed with this patch:
[gossip/pull] SendDigest -> DEBU f38 Sending IDENTITY_MSG digest: \
 [67a915badc8a2f9652aeb4c09463adf706d79e0f5393233c6473bee165ee4571 \
84ce9658381b0208178b4ee67b5267605f1641a448d3dd1401cb224aa1ec6f6e \
5a4ec05179d9bafceb546432f7458995c92c42c6fdc10fa0fdefe449c1b46eba \
a74e91e5ea97f87f9f95c0c455963ac5e9dc73a7f99154613e1c17dc7c31fbf1] \
to 172.20.0.4:7051 [90 78 192 81 121 217 186 252 235 84 100 50 247\
 69 137 149 201 44 66 198 253 193 15 160 253 239 228 73 193 180 110 186]

Change-Id: I32192cce7fd67921328c10345263e661eaa8f296
Signed-off-by: yacovm <yacovm@il.ibm.com>

gossip/gossip/pull/pullstore.go

@@ -276,7 +276,10 @@ func (p *pullMediatorImpl) SendDigest(digest []string, nonce uint64, context int
 		},
 	}
 	remotePeer := context.(proto.ReceivedMessage).GetConnectionInfo()
-	p.logger.Debug("Sending", p.config.MsgType, "digest:", digMsg.GetDataDig().Digests, "to", remotePeer)
+	if p.logger.IsEnabledFor(logging.DEBUG) {
+		p.logger.Debug("Sending", p.config.MsgType, "digest:", digMsg.GetDataDig().FormattedDigests(), "to", remotePeer)
+	}
+
 	context.(proto.ReceivedMessage).Respond(digMsg)
 }
 
@@ -295,7 +298,9 @@ func (p *pullMediatorImpl) SendReq(dest string, items []string, nonce uint64) {
 			},
 		},
 	}
-	p.logger.Debug("Sending", req, "to", dest)
+	if p.logger.IsEnabledFor(logging.DEBUG) {
+		p.logger.Debug("Sending", req.GetDataReq().FormattedDigests(), "to", dest)
+	}
 	sMsg, err := req.NoopSign()
 	if err != nil {
 		p.logger.Warning("Failed creating SignedGossipMessage:", err)

protos/gossip/extensions.go

@@ -18,6 +18,7 @@ package gossip
 
 import (
 	"bytes"
+	"encoding/hex"
 	"errors"
 	"fmt"
 
@@ -542,6 +543,28 @@ func (m *SignedGossipMessage) String() string {
 	return fmt.Sprintf("GossipMessage: %v, Envelope: %s", gMsg, env)
 }
 
+func (dd *DataRequest) FormattedDigests() []string {
+	if dd.MsgType == PullMsgType_IDENTITY_MSG {
+		return digestsToHex(dd.Digests)
+	}
+	return dd.Digests
+}
+
+func (dd *DataDigest) FormattedDigests() []string {
+	if dd.MsgType == PullMsgType_IDENTITY_MSG {
+		return digestsToHex(dd.Digests)
+	}
+	return dd.Digests
+}
+
+func digestsToHex(digests []string) []string {
+	a := make([]string, len(digests))
+	for i, dig := range digests {
+		a[i] = hex.EncodeToString([]byte(dig))
+	}
+	return a
+}
+
 // Abs returns abs(a-b)
 func abs(a, b uint64) uint64 {
 	if a > b {