/
runtime.go
160 lines (142 loc) · 3.84 KB
/
runtime.go
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package runtime
import (
"context"
"errors"
"fmt"
"os"
"os/signal"
msync "sync"
"syscall"
"github.com/open-feature/flagd/core/pkg/evaluator"
"github.com/open-feature/flagd/core/pkg/logger"
"github.com/open-feature/flagd/core/pkg/service"
"github.com/open-feature/flagd/core/pkg/sync"
"github.com/open-feature/flagd/flagd/pkg/service/flag-evaluation/ofrep"
flagsync "github.com/open-feature/flagd/flagd/pkg/service/flag-sync"
"golang.org/x/sync/errgroup"
)
type Runtime struct {
Evaluator evaluator.IEvaluator
Logger *logger.Logger
FlagSync flagsync.ISyncService
OfrepService ofrep.IOfrepService
Service service.IFlagEvaluationService
ServiceConfig service.Configuration
SyncImpl []sync.ISync
mu msync.Mutex
}
//nolint:funlen
func (r *Runtime) Start() error {
if r.Service == nil {
return errors.New("no service set")
}
if len(r.SyncImpl) == 0 {
return errors.New("no sync implementation set")
}
if r.Evaluator == nil {
return errors.New("no evaluator set")
}
ctx, cancel := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
defer cancel()
g, gCtx := errgroup.WithContext(ctx)
dataSync := make(chan sync.DataSync, len(r.SyncImpl))
// Initialize DataSync channel watcher
g.Go(func() error {
for {
select {
case data := <-dataSync:
// resync events are triggered when a delete occurs during flag merges in the store
// resync events may trigger further resync events, however for a flag to be deleted from the store
// its source must match, preventing the opportunity for resync events to snowball
if resyncRequired := r.updateAndEmit(data); resyncRequired {
for _, s := range r.SyncImpl {
p := s
g.Go(func() error {
err := p.ReSync(gCtx, dataSync)
if err != nil {
return fmt.Errorf("error resyncing sources: %w", err)
}
return nil
})
}
}
case <-gCtx.Done():
return nil
}
}
})
// Init sync providers
for _, s := range r.SyncImpl {
if err := s.Init(gCtx); err != nil {
return fmt.Errorf("sync provider Init returned error: %w", err)
}
}
// Start sync provider
for _, s := range r.SyncImpl {
p := s
g.Go(func() error {
if err := p.Sync(gCtx, dataSync); err != nil {
return fmt.Errorf("sync provider returned error: %w", err)
}
return nil
})
}
defer func() {
r.Logger.Info("Shutting down server...")
r.Service.Shutdown()
r.Logger.Info("Server successfully shutdown.")
}()
g.Go(func() error {
// Readiness probe rely on the runtime
r.ServiceConfig.ReadinessProbe = r.isReady
if err := r.Service.Serve(gCtx, r.ServiceConfig); err != nil {
return fmt.Errorf("error returned from serving flag evaluation service: %w", err)
}
return nil
})
g.Go(func() error {
err := r.OfrepService.Start(gCtx)
if err != nil {
return fmt.Errorf("error from ofrep server: %w", err)
}
return nil
})
g.Go(func() error {
err := r.FlagSync.Start(gCtx)
if err != nil {
return fmt.Errorf("error from sync server: %w", err)
}
return nil
})
if err := g.Wait(); err != nil {
return fmt.Errorf("errgroup closed with error: %w", err)
}
return nil
}
func (r *Runtime) isReady() bool {
// if all providers can watch for flag changes, we are ready.
for _, p := range r.SyncImpl {
if !p.IsReady() {
return false
}
}
return true
}
// updateAndEmit helps to update state, notify changes and trigger sync updates
func (r *Runtime) updateAndEmit(payload sync.DataSync) bool {
r.mu.Lock()
defer r.mu.Unlock()
notifications, resyncRequired, err := r.Evaluator.SetState(payload)
if err != nil {
r.Logger.Error(err.Error())
return false
}
r.Service.Notify(service.Notification{
Type: service.ConfigurationChange,
Data: map[string]interface{}{
"flags": notifications,
},
})
r.FlagSync.Emit(resyncRequired, payload.Source)
return resyncRequired
}