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listener.go
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listener.go
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// Copyright 2022 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package local
import (
"context"
"errors"
"fmt"
config "github.com/ServiceWeaver/weaver-gke/internal/config"
"github.com/ServiceWeaver/weaver-gke/internal/nanny"
"github.com/ServiceWeaver/weaver-gke/internal/store"
"google.golang.org/protobuf/proto"
)
// RecordListener records the network listener exported by an application
// version.
func RecordListener(ctx context.Context, s store.Store, cfg *config.GKEConfig, lis *nanny.Listener) error {
// Record the listener by adding a serialized version of the listener
// to internal.ListenState, stored under an application-version-scoped key
// "listeners" (e.g. /app/todo/deployment/a47e1a97/listeners).
state := &ListenState{}
addListener := func(*store.Version) error {
// Add spec into state.Listeners, but only if it doesn't already exist.
for _, existing := range state.Listeners {
if proto.Equal(lis, existing) {
return store.ErrUnchanged
}
}
state.Listeners = append(state.Listeners, lis)
return nil
}
key := store.AppVersionKey(cfg, "listeners")
histKey := store.AppVersionKey(cfg, store.HistoryKey)
err := store.AddToSet(ctx, s, histKey, key)
if err != nil && !errors.Is(err, store.ErrUnchanged) {
// Track the key in the store under histKey.
return fmt.Errorf("unable to record key %q under %q: %w", key, histKey, err)
}
_, err = store.UpdateProto(ctx, s, key, state, addListener)
if errors.Is(err, store.ErrUnchanged) {
err = nil
}
return err
}
// GetListeners returns network listeners in the given store associated with
// a given application version.
//
// If a replica that exports a listener dies, we don't update the traffic rules
// to reflect the new set of listeners in case of a gke-local deployer. Note
// that this is intentional, as we don't worry about processes deaths.
func GetListeners(ctx context.Context, s store.Store, cfg *config.GKEConfig) ([]*nanny.Listener, error) {
key := store.AppVersionKey(cfg, "listeners")
var state ListenState
if _, err := store.GetProto(ctx, s, key, &state, nil); err != nil {
return nil, err
}
return state.Listeners, nil
}