[#447] innerring: Define governance processor

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

pkg/innerring/processors/governance/processor.go

@@ -0,0 +1,109 @@
+package governance
+
+import (
+	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
+	"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"
+)
+
+// GovernanceProcessor manages governance sync tasks. This process must not be
+// interrupted by other sync operation, so we limit pool size for processor to
+// one.
+const ProcessorPoolSize = 1
+
+type (
+	// AlphabetState is a callback interface for inner ring global state.
+	AlphabetState interface {
+		IsAlphabet() bool
+	}
+
+	// Voter is a callback interface for alphabet contract voting.
+	Voter interface {
+		VoteForSidechainValidator(keys keys.PublicKeys) error
+	}
+
+	// EpochState is a callback interface for inner ring global state.
+	EpochState interface {
+		EpochCounter() uint64
+	}
+
+	// Processor of events related to governance in the network.
+	Processor struct {
+		log           *zap.Logger
+		pool          *ants.Pool
+		neofsContract util.Uint160
+
+		alphabetState AlphabetState
+		epochState    EpochState
+		voter         Voter
+
+		mainnetClient *client.Client
+		morphClient   *client.Client
+	}
+
+	// Params of the processor constructor.
+	Params struct {
+		Log           *zap.Logger
+		NeoFSContract util.Uint160
+
+		AlphabetState AlphabetState
+		EpochState    EpochState
+		Voter         Voter
+
+		MorphClient   *client.Client
+		MainnetClient *client.Client
+	}
+)
+
+// New creates balance contract processor instance.
+func New(p *Params) (*Processor, error) {
+	switch {
+	case p.Log == nil:
+		return nil, errors.New("ir/governance: logger is not set")
+	case p.MainnetClient == nil:
+		return nil, errors.New("ir/governance: neo:mainnet client is not set")
+	case p.MorphClient == nil:
+		return nil, errors.New("ir/governance: neo:sidechain client is not set")
+	case p.AlphabetState == nil:
+		return nil, errors.New("ir/governance: global state is not set")
+	case p.EpochState == nil:
+		return nil, errors.New("ir/governance: global state is not set")
+	case p.Voter == nil:
+		return nil, errors.New("ir/governance: global state is not set")
+	}
+
+	pool, err := ants.NewPool(ProcessorPoolSize, ants.WithNonblocking(true))
+	if err != nil {
+		return nil, errors.Wrap(err, "ir/governance: can't create worker pool")
+	}
+
+	return &Processor{
+		log:           p.Log,
+		pool:          pool,
+		neofsContract: p.NeoFSContract,
+		alphabetState: p.AlphabetState,
+		epochState:    p.EpochState,
+		voter:         p.Voter,
+		mainnetClient: p.MainnetClient,
+		morphClient:   p.MorphClient,
+	}, nil
+}
+
+// ListenerParsers for the 'event.Listener' event producer.
+func (gp *Processor) ListenerParsers() []event.ParserInfo {
+	return nil
+}
+
+// ListenerHandlers for the 'event.Listener' event producer.
+func (gp *Processor) ListenerHandlers() []event.HandlerInfo {
+	return nil
+}
+
+// TimersHandlers for the 'Timers' event producer.
+func (gp *Processor) TimersHandlers() []event.HandlerInfo {
+	return nil
+}