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replication_test.go
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replication_test.go
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package crdt
import (
"errors"
"net"
"strconv"
"testing"
"time"
"google.golang.org/grpc"
)
const (
NoOfPeers = 3
)
type ReplicationTestServer struct {
listener net.Listener
srv *grpc.Server
rsrv *ReplicationServer
}
func NewTestReplicationServer() (*ReplicationTestServer, error) {
addr, err := net.ResolveTCPAddr("tcp", ":0")
if err != nil {
return nil, err
}
lner, err := net.ListenTCP("tcp", addr)
if err != nil {
return nil, err
}
srv := grpc.NewServer()
return &ReplicationTestServer{
srv: srv,
listener: lner,
}, nil
}
func TestReplicationPing(t *testing.T) {
t.Parallel()
testServers := make([]*ReplicationTestServer, 0, NoOfPeers)
for i := 0; i < NoOfPeers; i++ {
srv, err := NewTestReplicationServer()
if err != nil {
t.Fatalf("cannot create test server: %s", err)
}
rsrv := NewReplicationServer(strconv.Itoa(i+1), 3*time.Second)
srv.srv.RegisterService(&_ReplicationTransport_serviceDesc, rsrv)
go func() {
if err := srv.srv.Serve(srv.listener); err != nil {
t.Errorf("cannot start server:%d %q", i+1, err)
}
}()
testServers = append(testServers, srv)
}
defer func() {
for _, srv := range testServers {
srv.srv.Stop()
}
}()
clients := make([]*ReplicationClient, 0, len(testServers))
for i, srv := range testServers {
conn, err := grpc.Dial(srv.listener.Addr().String(), grpc.WithInsecure())
if err != nil {
t.Fatalf("cannot create client[%d]: %s", i, err)
}
// These defers will not be called until the entire test
// completes running, which is exactly what we want.
defer conn.Close()
clients = append(clients, NewReplicationClient(conn, strconv.Itoa(i+1)))
}
var attempts int32 = 5
for _, client := range clients {
var count = client.count
for i := 0; i < int(attempts); i++ {
if err := client.Ping(); err != nil {
t.Errorf("cannot ping client:%d %q", client.Id(), err)
}
}
if count += attempts; client.count != count {
t.Errorf("expected ping count: %d, actual: %d", count, client.count)
}
}
}
type crdtRequest struct{}
func (c crdtRequest) GetQuery() ([]byte, error) {
return []byte("query"), nil
}
var _ CRDTRequest = crdtRequest{}
type crdtBackend struct{}
func (c crdtBackend) Query(query []byte) (<-chan []byte, <-chan error) {
var noOfResults = 5
dChan, eChan := make(chan []byte, noOfResults), make(chan error, 1)
defer func() {
close(dChan)
close(eChan)
}()
switch string(query) {
case "query":
for i := 0; i < noOfResults; i++ {
dChan <- []byte("result-" + strconv.Itoa(i+1))
}
eChan <- nil
default:
eChan <- errors.New("something's borked")
}
return dChan, eChan
}
var _ CRDTBackend = crdtBackend{}
func TestReplicationQuery(t *testing.T) {
t.Parallel()
backend := crdtBackend{}
request := crdtRequest{}
testServers := make([]*ReplicationTestServer, 0, NoOfPeers)
for i := 0; i < NoOfPeers; i++ {
srv, err := NewTestReplicationServer()
if err != nil {
t.Fatalf("cannot create test server: %s", err)
}
rsrv := NewReplicationServer(strconv.Itoa(i+1), 3*time.Second)
rsrv.Backend = backend
srv.srv.RegisterService(&_ReplicationTransport_serviceDesc, rsrv)
go func() {
if err := srv.srv.Serve(srv.listener); err != nil {
t.Errorf("cannot start server:%d %q", i+1, err)
}
}()
testServers = append(testServers, srv)
}
defer func() {
for _, srv := range testServers {
srv.srv.Stop()
}
}()
clients := make([]*ReplicationClient, 0, len(testServers))
for i, srv := range testServers {
conn, err := grpc.Dial(srv.listener.Addr().String(), grpc.WithInsecure())
if err != nil {
t.Fatalf("cannot create client[%d]: %s", i, err)
}
// These defers will not be called until the entire test
// completes running, which is exactly what we want.
defer conn.Close()
clients = append(clients, NewReplicationClient(conn, strconv.Itoa(i+1)))
}
for _, client := range clients {
dChan, eChan := client.Query(request)
for d := range dChan {
t.Logf("retrieved: %q", d)
}
for e := range eChan {
if e != nil {
t.Errorf("error occurred while querying: %s", e)
}
}
}
}