client_test: Support test cluster /w >1 master

Now it's possible to run client tests against a NEO cluster which
has more than one master nodes. We need this adjustement in order
to test NEO/go client modification in order to support more than
one master node.

go/neo/client_test.go

@@ -63,7 +63,7 @@ type NEOSrv interface {
 type NEOSrvOptions struct {
 	workdir string // location for database and log files
 	name    string // name of the cluster
-	// nmaster
+	nmaster int    // how many masters our cluster has
 	// npartition
 	// nreplica
 
@@ -82,7 +82,7 @@ type NEOPySrv struct {
 	done    chan struct{} // ready after Wait completes
 	errExit error         // error from Wait
 
-	masterAddr string // address of master in spawned cluster
+	masterAddrSlice []string // addresses of master in spawned cluster
 }
 
 func (_ *NEOPySrv) Bugs() []string {
@@ -114,6 +114,7 @@ func StartNEOPySrv(opt NEOSrvOptions) (_ *NEOPySrv, err error) {
 
 	// TODO set $PYTHONPATH to top, so that `import neo` works without `pip install -e .`
 	n.pysrv = xexec.Command("./py/runneo.py", workdir, opt.name)
+	n.pysrv.Args = append(n.pysrv.Args, "master_count="+fmt.Sprintf("%v", opt.nmaster))
 	if opt.SSL {
 		n.pysrv.Args = append(n.pysrv.Args, "ca="  +opt.CA())
 		n.pysrv.Args = append(n.pysrv.Args, "cert="+opt.Cert())
@@ -165,7 +166,7 @@ func StartNEOPySrv(opt NEOSrvOptions) (_ *NEOPySrv, err error) {
 	if err != nil {
 		return nil, err
 	}
-	n.masterAddr = string(masterAddr)
+	n.masterAddrSlice = strings.Split(string(masterAddr), " ")
 
 	return n, nil
 }
@@ -175,7 +176,7 @@ func (n *NEOPySrv) clusterName() string {
 }
 
 func (n *NEOPySrv) URL() string {
-	return fmt.Sprintf("%s%s/%s", n.opt.URLPrefix(), n.masterAddr, n.clusterName())
+	return fmt.Sprintf("%s%s/%s", n.opt.URLPrefix(), strings.Join(n.masterAddrSlice, ","), n.clusterName())
 }
 
 func (n *NEOPySrv) LogTail() (string, error) {
@@ -290,7 +291,7 @@ func StartNEOGoSrv(opt NEOSrvOptions) (_ *NEOGoSrv, err error) {
 	if err != nil {
 		return nil, err
 	}
-	n.S = NewStorage(opt.name, []string{n.masterAddr()}, net, n.Sback)
+	n.S = NewStorage(opt.name, n.masterAddrSlice(), net, n.Sback)
 	serveWG.Go(func(ctx context.Context) error {
 		return n.S.Run(ctx, n.Sl)
 	})
@@ -353,12 +354,12 @@ func (n *NEOGoSrv) Close() (err error) {
 	return err
 }
 
-func (n *NEOGoSrv) masterAddr() string {
-	return n.Ml.Addr().String()
+func (n *NEOGoSrv) masterAddrSlice() []string {
+	return []string {n.Ml.Addr().String()}
 }
 
 func (n *NEOGoSrv) URL() string {
-	return fmt.Sprintf("%s%s/%s", n.opt.URLPrefix(), n.masterAddr(), n.opt.name)
+	return fmt.Sprintf("%s%s/%s", n.opt.URLPrefix(), strings.Join(n.masterAddrSlice(), ","), n.opt.name)
 }
 
 
@@ -437,13 +438,15 @@ func withNEOSrv(t *testing.T, f func(t *testing.T, nsrv NEOSrv), optv ...tOption
 
 	// TODO + all variants with nreplica=X, npartition=Y, nmaster=Z, ... ?
 
+
 	for _, ssl := range []bool{false, true} {
 		kind := ""
 		if ssl { kind = "ssl" } else { kind = "!ssl" }
 
 		neoOpt := NEOSrvOptions{
-			name: "1",
-			SSL:  ssl,
+			name:    "1",
+			SSL:     ssl,
+			nmaster: 1,
 		}
 
 		// startNEOpy starts NEO/py server with database in workdir/
@@ -468,7 +471,9 @@ func withNEOSrv(t *testing.T, f func(t *testing.T, nsrv NEOSrv), optv ...tOption
 				}
 				cmd.Args = append(cmd.Args,
 					opt.Preload,
-					npy.masterAddr,
+					// py internal representation of master_nodes is a
+					// string where each addr is separated by 1 space
+					strings.Join(npy.masterAddrSlice, " "),
 				)
 				cmd.Stdin  = nil
 				cmd.Stdout = os.Stdout

go/neo/py/runneo.py

@@ -45,6 +45,9 @@ def main():
     kw = {'clear_databases': False} # switch default not to clear data on startup
     for arg in sys.argv[3:]:
         k, v = arg.split('=')
+        # We need to cast specific argument to specific types
+        if k in ("master_count",):
+            v = int(v)
         kw[k] = v