[#265] innerring: Generate new audit event

Signed-off-by: Alex Vanin <alexey@nspcc.ru>

pkg/innerring/processors/audit/processor.go

@@ -0,0 +1,87 @@
+package audit
+
+import (
+	"github.com/nspcc-dev/neo-go/pkg/util"
+	"github.com/nspcc-dev/neofs-node/pkg/morph/client"
+	"github.com/nspcc-dev/neofs-node/pkg/morph/event"
+	"github.com/panjf2000/ants/v2"
+	"github.com/pkg/errors"
+	"go.uber.org/zap"
+)
+
+type (
+	// Indexer is a callback interface for inner ring global state.
+	Indexer interface {
+		Index() int32
+	}
+
+	// Processor of events related with data audit.
+	Processor struct {
+		log               *zap.Logger
+		pool              *ants.Pool
+		containerContract util.Uint160
+		auditContract     util.Uint160
+		morphClient       *client.Client
+		irList            Indexer
+	}
+
+	// Params of the processor constructor.
+	Params struct {
+		Log               *zap.Logger
+		ContainerContract util.Uint160
+		AuditContract     util.Uint160
+		MorphClient       *client.Client
+		IRList            Indexer
+	}
+)
+
+// AuditProcessor manages audit tasks and fills queue for next epoch. This
+// process must not be interrupted by new audit epoch, so we limit pool size
+// for processor to one.
+const ProcessorPoolSize = 1
+
+// New creates audit processor instance.
+func New(p *Params) (*Processor, error) {
+	switch {
+	case p.Log == nil:
+		return nil, errors.New("ir/audit: logger is not set")
+	case p.MorphClient == nil:
+		return nil, errors.New("ir/audit: neo:morph client is not set")
+	case p.IRList == nil:
+		return nil, errors.New("ir/audit: global state is not set")
+	}
+
+	pool, err := ants.NewPool(ProcessorPoolSize, ants.WithNonblocking(true))
+	if err != nil {
+		return nil, errors.Wrap(err, "ir/audit: can't create worker pool")
+	}
+
+	return &Processor{
+		log:               p.Log,
+		pool:              pool,
+		containerContract: p.ContainerContract,
+		auditContract:     p.AuditContract,
+		morphClient:       p.MorphClient,
+		irList:            p.IRList,
+	}, nil
+}
+
+// ListenerParsers for the 'event.Listener' event producer.
+func (ap *Processor) ListenerParsers() []event.ParserInfo {
+	return nil
+}
+
+// ListenerHandlers for the 'event.Listener' event producer.
+func (ap *Processor) ListenerHandlers() []event.HandlerInfo {
+	return nil
+}
+
+// TimersHandlers for the 'Timers' event producer.
+func (ap *Processor) TimersHandlers() []event.HandlerInfo {
+	return nil
+}
+
+// StartAuditHandler for the internal event producer.
+func (ap *Processor) StartAuditHandler() event.Handler {
+	return ap.handleNewAuditRound
+}