open-consul/agent/grpc-external/testutils/fsm.go

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package testutils
import (
"context"
"sync"
"testing"
"time"
"github.com/hashicorp/consul/agent/consul/state"
"github.com/hashicorp/consul/agent/consul/stream"
"github.com/stretchr/testify/require"
)
func TestStateStore(t *testing.T, publisher state.EventPublisher) *state.Store {
t.Helper()
gc, err := state.NewTombstoneGC(time.Second, time.Millisecond)
require.NoError(t, err)
if publisher == nil {
publisher = stream.NoOpEventPublisher{}
}
return state.NewStateStoreWithEventPublisher(gc, publisher)
}
type Registrar func(*FakeFSM, *stream.EventPublisher)
type FakeFSMConfig struct {
Register Registrar
Refresh []stream.Topic
publisher *stream.EventPublisher
}
type FakeFSM struct {
config FakeFSMConfig
lock sync.Mutex
store *state.Store
}
func newFakeFSM(t *testing.T, config FakeFSMConfig) *FakeFSM {
t.Helper()
store := TestStateStore(t, config.publisher)
fsm := &FakeFSM{store: store, config: config}
config.Register(fsm, fsm.config.publisher)
return fsm
}
func (f *FakeFSM) GetStore() *state.Store {
f.lock.Lock()
defer f.lock.Unlock()
return f.store
}
func (f *FakeFSM) ReplaceStore(store *state.Store) {
f.lock.Lock()
defer f.lock.Unlock()
oldStore := f.store
f.store = store
oldStore.Abandon()
for _, topic := range f.config.Refresh {
f.config.publisher.RefreshTopic(topic)
}
}
func SetupFSMAndPublisher(t *testing.T, config FakeFSMConfig) (*FakeFSM, state.EventPublisher) {
t.Helper()
config.publisher = stream.NewEventPublisher(10 * time.Second)
fsm := newFakeFSM(t, config)
ctx, cancel := context.WithCancel(context.Background())
t.Cleanup(cancel)
go config.publisher.Run(ctx)
return fsm, config.publisher
}