Ensure that revision is consistent for empty lists

go.mod

@@ -102,7 +102,7 @@ require (
 	github.com/rakelkar/gonetsh v0.0.0-20190719023240-501daadcadf8 // indirect
 	github.com/rancher/dynamiclistener v0.1.1-0.20191113144757-736b5d5d8b51
 	github.com/rancher/helm-controller v0.2.2
-	github.com/rancher/kine v0.2.3
+	github.com/rancher/kine v0.2.4
 	github.com/rancher/remotedialer v0.2.0
 	github.com/rancher/wrangler v0.2.0
 	github.com/rancher/wrangler-api v0.2.0

go.sum

@@ -592,8 +592,8 @@ github.com/rancher/go-dqlite v1.1.0-k3s.1 h1:w3ghNkY5vqRnnrcqxvHkpBQr6E+R/nIwJfa
 github.com/rancher/go-dqlite v1.1.0-k3s.1/go.mod h1:lj8UhpkZddn/Ag0tBsnkbELbxHGMpzrZLMs/nW9/DX4=
 github.com/rancher/helm-controller v0.2.2 h1:MUqisy53/Ay1EYOF2uTCYBbGpgtZLNKKrI01BdxIbQo=
 github.com/rancher/helm-controller v0.2.2/go.mod h1:0JkL0UjxddNbT4FmLoESarD4Mz8xzA5YlejqJ/U4g+8=
-github.com/rancher/kine v0.2.3 h1:ln4Pmtb3ReqCLf6hF7aF1QmMLgnYPbq4/VZ1UyJ9v3A=
+github.com/rancher/kine v0.2.4 h1:Vtv8twV2u3Gh2cOL7vXv69besGc3YahxYeFzICV6GB8=
-github.com/rancher/kine v0.2.3/go.mod h1:SdBUuE7e3XyrJvdBxCl9TMMapF+wyZnMZSP/H59OqNE=
+github.com/rancher/kine v0.2.4/go.mod h1:SdBUuE7e3XyrJvdBxCl9TMMapF+wyZnMZSP/H59OqNE=
 github.com/rancher/kubernetes v1.16.2-k3s.1 h1:+oJEecXgQDkEOD/X8z2YUdYVonbXZtGzXsmtKDPYesg=
 github.com/rancher/kubernetes v1.16.2-k3s.1/go.mod h1:SmhGgKfQ30imqjFVj8AI+iW+zSyFsswNErKYeTfgoH0=
 github.com/rancher/kubernetes/staging/src/k8s.io/api v1.16.2-k3s.1 h1:2kK5KD6MU86txBYKG+tM6j5zbey02DaIDtwpG5JsfnI=

vendor/github.com/rancher/kine/pkg/logstructured/logstructured.go

@@ -155,7 +155,6 @@ func (l *LogStructured) Delete(ctx context.Context, key string, revision int64)
 
 func (l *LogStructured) List(ctx context.Context, prefix, startKey string, limit, revision int64) (revRet int64, kvRet []*server.KeyValue, errRet error) {
 	defer func() {
-		l.adjustRevision(ctx, &revRet)
 		logrus.Debugf("LIST %s, start=%s, limit=%d, rev=%d => rev=%d, kvs=%d, err=%v", prefix, startKey, limit, revision, revRet, len(kvRet), errRet)
 	}()
 
@@ -163,7 +162,17 @@ func (l *LogStructured) List(ctx context.Context, prefix, startKey string, limit
 	if err != nil {
 		return 0, nil, err
 	}
-	if revision != 0 {
+	if revision == 0 && len(events) == 0 {
+		// if no revision is requested and no events are returned, then
+		// get the current revision and relist.  Relist is required because
+		// between now and getting the current revision something could have
+		// been created.
+		currentRev, err := l.log.CurrentRevision(ctx)
+		if err != nil {
+			return 0, nil, err
+		}
+		return l.List(ctx, prefix, startKey, limit, currentRev)
+	} else if revision != 0 {
 		rev = revision
 	}
 
@@ -176,10 +185,23 @@ func (l *LogStructured) List(ctx context.Context, prefix, startKey string, limit
 
 func (l *LogStructured) Count(ctx context.Context, prefix string) (revRet int64, count int64, err error) {
 	defer func() {
-		l.adjustRevision(ctx, &revRet)
 		logrus.Debugf("COUNT %s => rev=%d, count=%d, err=%v", prefix, revRet, count, err)
 	}()
-	return l.log.Count(ctx, prefix)
+	rev, count, err := l.log.Count(ctx, prefix)
+	if err != nil {
+		return 0, 0, err
+	}
+
+	if count == 0 {
+		// if count is zero, then so is revision, so now get the current revision and re-count at that revision
+		currentRev, err := l.log.CurrentRevision(ctx)
+		if err != nil {
+			return 0, 0, err
+		}
+		rev, rows, err := l.List(ctx, prefix, prefix, 1000, currentRev)
+		return rev, int64(len(rows)), err
+	}
+	return rev, count, nil
 }
 
 func (l *LogStructured) Update(ctx context.Context, key string, value []byte, revision, lease int64) (revRet int64, kvRet *server.KeyValue, updateRet bool, errRet error) {

vendor/modules.txt

@@ -769,7 +769,7 @@ github.com/rancher/helm-controller/pkg/generated/informers/externalversions/helm
 github.com/rancher/helm-controller/pkg/generated/listers/helm.cattle.io/v1
 github.com/rancher/helm-controller/pkg/generated/informers/externalversions/internalinterfaces
 github.com/rancher/helm-controller/pkg/apis/helm.cattle.io
-# github.com/rancher/kine v0.2.3
+# github.com/rancher/kine v0.2.4
 github.com/rancher/kine/pkg/client
 github.com/rancher/kine/pkg/endpoint
 github.com/rancher/kine/pkg/drivers/dqlite