core: move Blockchainer interface to a separate package

pkg/consensus/consensus.go

@@ -12,6 +12,7 @@ import (
 	"github.com/nspcc-dev/dbft/payload"
 	"github.com/nspcc-dev/neo-go/pkg/core"
 	coreb "github.com/nspcc-dev/neo-go/pkg/core/block"
+	"github.com/nspcc-dev/neo-go/pkg/core/blockchainer"
 	"github.com/nspcc-dev/neo-go/pkg/core/mempool"
 	"github.com/nspcc-dev/neo-go/pkg/core/transaction"
 	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
@@ -77,7 +78,7 @@ type Config struct {
 	// about the new block that needs to be broadcasted.
 	RelayBlock func(b *coreb.Block)
 	// Chain is a core.Blockchainer instance.
-	Chain core.Blockchainer
+	Chain blockchainer.Blockchainer
 	// RequestTx is a callback to which will be called
 	// when a node lacks transactions present in a block.
 	RequestTx func(h ...util.Uint256)

pkg/core/blockchainer/blockchainer.go

@@ -1,4 +1,4 @@
-package core
+package blockchainer
 
 import (
 	"github.com/nspcc-dev/neo-go/pkg/config"

pkg/core/interop_system.go

@@ -6,6 +6,7 @@ import (
 	"math"
 
 	"github.com/nspcc-dev/neo-go/pkg/core/block"
+	"github.com/nspcc-dev/neo-go/pkg/core/blockchainer"
 	"github.com/nspcc-dev/neo-go/pkg/core/dao"
 	"github.com/nspcc-dev/neo-go/pkg/core/state"
 	"github.com/nspcc-dev/neo-go/pkg/core/transaction"
@@ -32,7 +33,7 @@ type StorageContext struct {
 // getBlockHashFromElement converts given vm.Element to block hash using given
 // Blockchainer if needed. Interop functions accept both block numbers and
 // block hashes as parameters, thus this function is needed.
-func getBlockHashFromElement(bc Blockchainer, element *vm.Element) (util.Uint256, error) {
+func getBlockHashFromElement(bc blockchainer.Blockchainer, element *vm.Element) (util.Uint256, error) {
 	var hash util.Uint256
 	hashbytes := element.Bytes()
 	if len(hashbytes) <= 5 {

pkg/core/interops.go

@@ -11,6 +11,7 @@ import (
 	"sort"
 
 	"github.com/nspcc-dev/neo-go/pkg/core/block"
+	"github.com/nspcc-dev/neo-go/pkg/core/blockchainer"
 	"github.com/nspcc-dev/neo-go/pkg/core/dao"
 	"github.com/nspcc-dev/neo-go/pkg/core/state"
 	"github.com/nspcc-dev/neo-go/pkg/core/transaction"
@@ -22,7 +23,7 @@ import (
 )
 
 type interopContext struct {
-	bc            Blockchainer
+	bc            blockchainer.Blockchainer
 	trigger       trigger.Type
 	block         *block.Block
 	tx            *transaction.Transaction
@@ -31,7 +32,7 @@ type interopContext struct {
 	log           *zap.Logger
 }
 
-func newInteropContext(trigger trigger.Type, bc Blockchainer, d dao.DAO, block *block.Block, tx *transaction.Transaction, log *zap.Logger) *interopContext {
+func newInteropContext(trigger trigger.Type, bc blockchainer.Blockchainer, d dao.DAO, block *block.Block, tx *transaction.Transaction, log *zap.Logger) *interopContext {
 	dao := dao.NewCached(d)
 	nes := make([]state.NotificationEvent, 0)
 	return &interopContext{bc, trigger, block, tx, dao, nes, log}

pkg/network/blockqueue.go

@@ -2,8 +2,8 @@ package network
 
 import (
 	"github.com/Workiva/go-datastructures/queue"
-	"github.com/nspcc-dev/neo-go/pkg/core"
 	"github.com/nspcc-dev/neo-go/pkg/core/block"
+	"github.com/nspcc-dev/neo-go/pkg/core/blockchainer"
 	"go.uber.org/zap"
 )
 
@@ -11,11 +11,11 @@ type blockQueue struct {
 	log         *zap.Logger
 	queue       *queue.PriorityQueue
 	checkBlocks chan struct{}
-	chain       core.Blockchainer
+	chain       blockchainer.Blockchainer
 	relayF      func(*block.Block)
 }
 
-func newBlockQueue(capacity int, bc core.Blockchainer, log *zap.Logger, relayer func(*block.Block)) *blockQueue {
+func newBlockQueue(capacity int, bc blockchainer.Blockchainer, log *zap.Logger, relayer func(*block.Block)) *blockQueue {
 	if log == nil {
 		return nil
 	}

pkg/network/server.go

@@ -13,6 +13,7 @@ import (
 	"github.com/nspcc-dev/neo-go/pkg/consensus"
 	"github.com/nspcc-dev/neo-go/pkg/core"
 	"github.com/nspcc-dev/neo-go/pkg/core/block"
+	"github.com/nspcc-dev/neo-go/pkg/core/blockchainer"
 	"github.com/nspcc-dev/neo-go/pkg/core/transaction"
 	"github.com/nspcc-dev/neo-go/pkg/network/payload"
 	"github.com/nspcc-dev/neo-go/pkg/util"
@@ -53,7 +54,7 @@ type (
 
 		transport Transporter
 		discovery Discoverer
-		chain     core.Blockchainer
+		chain     blockchainer.Blockchainer
 		bQueue    *blockQueue
 		consensus consensus.Service
 
@@ -84,7 +85,7 @@ func randomID() uint32 {
 }
 
 // NewServer returns a new Server, initialized with the given configuration.
-func NewServer(config ServerConfig, chain core.Blockchainer, log *zap.Logger) (*Server, error) {
+func NewServer(config ServerConfig, chain blockchainer.Blockchainer, log *zap.Logger) (*Server, error) {
 	if log == nil {
 		return nil, errors.New("logger is a required parameter")
 	}

pkg/rpc/response/result/block.go

@@ -5,8 +5,8 @@ import (
 	"errors"
 	"fmt"
 
-	"github.com/nspcc-dev/neo-go/pkg/core"
 	"github.com/nspcc-dev/neo-go/pkg/core/block"
+	"github.com/nspcc-dev/neo-go/pkg/core/blockchainer"
 	"github.com/nspcc-dev/neo-go/pkg/core/transaction"
 	"github.com/nspcc-dev/neo-go/pkg/encoding/address"
 	"github.com/nspcc-dev/neo-go/pkg/io"
@@ -50,7 +50,7 @@ type (
 )
 
 // NewBlock creates a new Block wrapper.
-func NewBlock(b *block.Block, chain core.Blockchainer) Block {
+func NewBlock(b *block.Block, chain blockchainer.Blockchainer) Block {
 	res := Block{
 		Version:           b.Version,
 		Hash:              b.Hash(),

pkg/rpc/response/result/block_header.go

@@ -3,8 +3,8 @@ package result
 import (
 	"strconv"
 
-	"github.com/nspcc-dev/neo-go/pkg/core"
 	"github.com/nspcc-dev/neo-go/pkg/core/block"
+	"github.com/nspcc-dev/neo-go/pkg/core/blockchainer"
 	"github.com/nspcc-dev/neo-go/pkg/core/transaction"
 	"github.com/nspcc-dev/neo-go/pkg/encoding/address"
 	"github.com/nspcc-dev/neo-go/pkg/io"
@@ -31,7 +31,7 @@ type (
 )
 
 // NewHeader creates a new Header wrapper.
-func NewHeader(h *block.Header, chain core.Blockchainer) Header {
+func NewHeader(h *block.Header, chain blockchainer.Blockchainer) Header {
 	res := Header{
 		Hash:          h.Hash(),
 		Size:          io.GetVarSize(h),

pkg/rpc/response/result/tx_raw_output.go

@@ -4,8 +4,8 @@ import (
 	"encoding/json"
 	"errors"
 
-	"github.com/nspcc-dev/neo-go/pkg/core"
 	"github.com/nspcc-dev/neo-go/pkg/core/block"
+	"github.com/nspcc-dev/neo-go/pkg/core/blockchainer"
 	"github.com/nspcc-dev/neo-go/pkg/core/transaction"
 	"github.com/nspcc-dev/neo-go/pkg/util"
 )
@@ -27,7 +27,7 @@ type TransactionMetadata struct {
 }
 
 // NewTransactionOutputRaw returns a new ransactionOutputRaw object.
-func NewTransactionOutputRaw(tx *transaction.Transaction, header *block.Header, chain core.Blockchainer) TransactionOutputRaw {
+func NewTransactionOutputRaw(tx *transaction.Transaction, header *block.Header, chain blockchainer.Blockchainer) TransactionOutputRaw {
 	// confirmations formula
 	confirmations := int(chain.BlockHeight() - header.Base.Index + 1)
 	// set index position

pkg/rpc/response/result/unclaimed.go

@@ -2,6 +2,7 @@ package result
 
 import (
 	"github.com/nspcc-dev/neo-go/pkg/core"
+	"github.com/nspcc-dev/neo-go/pkg/core/blockchainer"
 	"github.com/nspcc-dev/neo-go/pkg/core/state"
 	"github.com/nspcc-dev/neo-go/pkg/util"
 )
@@ -14,7 +15,7 @@ type Unclaimed struct {
 }
 
 // NewUnclaimed creates a new Unclaimed wrapper using given Blockchainer.
-func NewUnclaimed(a *state.Account, chain core.Blockchainer) (*Unclaimed, error) {
+func NewUnclaimed(a *state.Account, chain blockchainer.Blockchainer) (*Unclaimed, error) {
 	var (
 		available   util.Fixed8
 		unavailable util.Fixed8

pkg/rpc/response/result/unspents.go

@@ -1,7 +1,7 @@
 package result
 
 import (
-	"github.com/nspcc-dev/neo-go/pkg/core"
+	"github.com/nspcc-dev/neo-go/pkg/core/blockchainer"
 	"github.com/nspcc-dev/neo-go/pkg/core/state"
 	"github.com/nspcc-dev/neo-go/pkg/util"
 )
@@ -29,7 +29,7 @@ var GlobalAssets = map[string]string{
 }
 
 // NewUnspents creates a new Account wrapper using given Blockchainer.
-func NewUnspents(a *state.Account, chain core.Blockchainer, addr string) Unspents {
+func NewUnspents(a *state.Account, chain blockchainer.Blockchainer, addr string) Unspents {
 	res := Unspents{
 		Address: addr,
 		Balance: make([]UnspentBalanceInfo, 0, len(a.Balances)),

pkg/rpc/server/server.go

@@ -10,6 +10,7 @@ import (
 	"net/http"
 	"strconv"
 
+	"github.com/nspcc-dev/neo-go/pkg/core/blockchainer"
 	"github.com/nspcc-dev/neo-go/pkg/rpc"
 
 	"github.com/nspcc-dev/neo-go/pkg/core"
@@ -35,7 +36,7 @@ type (
 	// Server represents the JSON-RPC 2.0 server.
 	Server struct {
 		*http.Server
-		chain      core.Blockchainer
+		chain      blockchainer.Blockchainer
 		config     rpc.Config
 		coreServer *network.Server
 		log        *zap.Logger
@@ -81,7 +82,7 @@ var invalidBlockHeightError = func(index int, height int) error {
 }
 
 // New creates a new Server struct.
-func New(chain core.Blockchainer, conf rpc.Config, coreServer *network.Server, log *zap.Logger) Server {
+func New(chain blockchainer.Blockchainer, conf rpc.Config, coreServer *network.Server, log *zap.Logger) Server {
 	httpServer := &http.Server{
 		Addr: conf.Address + ":" + strconv.FormatUint(uint64(conf.Port), 10),
 	}