[VOL-1462] Sync data between two voltha cores in the same pair
This commit consists of the following updates:
1) Background data syncing between two cores after a transaction
is completed by one core.
2) Add transaction management to southbound APIs (adapter facing).
This is enabled got adapter registration only for now.
3) Fix an issue with flow decomposition
4) Add the rough-in to allow a packet to be send to an OFAgent
with a transaction ID. Two cores can therefore send the same
packet and let the OFAgent discard the duplicate. The work in
OFAgent remains.
5) Cleanups
Change-Id: Ibe9d75edb66cfd6a0954bdfeb16a7e7c8a3c53b6
diff --git a/adapters/common/utils.go b/adapters/common/utils.go
index 98468b0..810a3d0 100644
--- a/adapters/common/utils.go
+++ b/adapters/common/utils.go
@@ -45,3 +45,29 @@
rand.Intn(128),
)
}
+
+const letterBytes = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+const (
+ letterIdxBits = 6 // 6 bits to represent a letter index
+ letterIdxMask = 1<<letterIdxBits - 1 // All 1-bits, as many as letterIdxBits
+ letterIdxMax = 63 / letterIdxBits // # of letter indices fitting in 63 bits
+)
+
+var src = rand.NewSource(time.Now().UnixNano())
+
+func GetRandomString(n int) string {
+ b := make([]byte, n)
+ // A src.Int63() generates 63 random bits, enough for letterIdxMax characters!
+ for i, cache, remain := n-1, src.Int63(), letterIdxMax; i >= 0; {
+ if remain == 0 {
+ cache, remain = src.Int63(), letterIdxMax
+ }
+ if idx := int(cache & letterIdxMask); idx < len(letterBytes) {
+ b[i] = letterBytes[idx]
+ i--
+ }
+ cache >>= letterIdxBits
+ remain--
+ }
+ return string(b)
+}
\ No newline at end of file