Merge pull request hashicorp#227 from superfell/fuzz-v2-one

Add fuzztest testsuite

Makefile

@@ -1,11 +1,14 @@
 DEPS = $(go list -f '{{range .TestImports}}{{.}} {{end}}' ./...)
 
 test:
-	go test -timeout=60s ./...
+	go test -timeout=60s .
 
 integ: test
-	INTEG_TESTS=yes go test -timeout=25s -run=Integ ./...
+	INTEG_TESTS=yes go test -timeout=25s -run=Integ .
 
+fuzz:
+	go test -timeout=300s ./fuzzy
+
 deps:
 	go get -d -v ./...
 	echo $(DEPS) | xargs -n1 go get -d

fuzzy/apply_src.go

@@ -0,0 +1,65 @@
+package fuzzy
+
+import (
+	"hash/fnv"
+	"math/rand"
+	"testing"
+	"time"
+)
+
+type applySource struct {
+	rnd  *rand.Rand
+	seed int64
+}
+
+// newApplySource will create a new source, any source created with the same seed will generate the same sequence of data.
+func newApplySource(seed string) *applySource {
+	h := fnv.New32()
+	h.Write([]byte(seed))
+	s := &applySource{seed: int64(h.Sum32())}
+	s.reset()
+	return s
+}
+
+// reset this source back to its initial state, it'll generate the same sequence of data it initally did
+func (a *applySource) reset() {
+	a.rnd = rand.New(rand.NewSource(a.seed))
+}
+
+func (a *applySource) nextEntry() []byte {
+	const sz = 33
+	r := make([]byte, sz)
+	for i := 0; i < len(r); i++ {
+		r[i] = byte(a.rnd.Int31n(256))
+	}
+	return r
+}
+
+type clusterApplier struct {
+	stopCh  chan bool
+	applied uint64
+	src     *applySource
+}
+
+// runs apply in chunks of n to the cluster, use the returned Applier to Stop() it
+func (a *applySource) apply(t *testing.T, c *cluster, n uint) *clusterApplier {
+	ap := &clusterApplier{stopCh: make(chan bool), src: a}
+	go ap.apply(t, c, n)
+	return ap
+}
+
+func (ca *clusterApplier) apply(t *testing.T, c *cluster, n uint) {
+	for true {
+		select {
+		case <-ca.stopCh:
+			return
+		default:
+			ca.applied += c.ApplyN(t, time.Second, ca.src, n)
+		}
+	}
+}
+
+func (ca *clusterApplier) stop() {
+	ca.stopCh <- true
+	close(ca.stopCh)
+}