[#122] subnet: implement `put` method

Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>

subnet/config.yml

@@ -1,4 +1,12 @@
 name: "NeoFS Subnet"
 safemethods: ["version"]
 permissions:
-  - methods: ["update"]
+  - methods: ["update"]
+events:
+  - name: SubnetPut
+    parameters:
+      - name: ownerKey
+        type: PublicKey
+      - name: info
+        type: ByteArray
+

subnet/subnet_contract.go

@@ -10,6 +10,17 @@ import (
 )
 
 const (
+	// ErrInvalidSubnetID is thrown when subnet id is not a slice of 4 bytes.
+	ErrInvalidSubnetID = "invalid subnet ID"
+	// ErrInvalidOwner is thrown when owner has invalid format.
+	ErrInvalidOwner = "invalid owner"
+	// ErrAlreadyExists is thrown when id already exists.
+	ErrAlreadyExists = "subnet id already exists"
+	// ErrNotExist is thrown when id doesn't exist.
+	ErrNotExist = "subnet id doesn't exist"
+
+	ownerPrefix       = 'o'
+	infoPrefix        = 'i'
 	notaryDisabledKey = 'z'
 )
 
@@ -27,6 +38,68 @@ func _deploy(data interface{}, isUpdate bool) {
 	storage.Put(ctx, []byte{notaryDisabledKey}, args.notaryDisabled)
 }
 
+// Put creates new subnet with the specified owner and info.
+func Put(id []byte, ownerKey interop.PublicKey, info []byte) {
+	if len(id) != 4 {
+		panic("put: " + ErrInvalidSubnetID)
+	}
+	if len(ownerKey) != interop.PublicKeyCompressedLen {
+		panic("put: " + ErrInvalidOwner)
+	}
+
+	ctx := storage.GetContext()
+	stKey := append([]byte{ownerPrefix}, id...)
+	if storage.Get(ctx, stKey) != nil {
+		panic("put: " + ErrAlreadyExists)
+	}
+
+	notaryDisabled := storage.Get(ctx, notaryDisabledKey).(bool)
+	if notaryDisabled {
+		alphabet := common.AlphabetNodes()
+		nodeKey := common.InnerRingInvoker(alphabet)
+		if len(nodeKey) == 0 {
+			if !runtime.CheckWitness(ownerKey) {
+				panic("put: witness check failed")
+			}
+			runtime.Notify("SubnetPut", ownerKey, info)
+			return
+		}
+
+		threshold := len(alphabet)*2/3 + 1
+		id := common.InvokeID([]interface{}{ownerKey, info}, []byte("put"))
+		n := common.Vote(ctx, id, nodeKey)
+		if n < threshold {
+			return
+		}
+
+		common.RemoveVotes(ctx, id)
+	} else {
+		if !runtime.CheckWitness(ownerKey) {
+			panic("put: owner witness check failed")
+		}
+
+		multiaddr := common.AlphabetAddress()
+		if !runtime.CheckWitness(multiaddr) {
+			panic("put: alphabet witness check failed")
+		}
+	}
+
+	storage.Put(ctx, stKey, ownerKey)
+	stKey[0] = infoPrefix
+	storage.Put(ctx, stKey, info)
+}
+
+// Get returns info about subnet with the specified id.
+func Get(id []byte) []byte {
+	ctx := storage.GetContext()
+	key := append([]byte{infoPrefix}, id...)
+	raw := storage.Get(ctx, key)
+	if raw == nil {
+		panic("get: " + ErrNotExist)
+	}
+	return raw.([]byte)
+}
+
 // Update method updates contract source code and manifest. Can be invoked
 // only by committee.
 func Update(script []byte, manifest []byte, data interface{}) {

tests/subnet_test.go

@@ -1,19 +1,24 @@
 package tests
 
 import (
+	"encoding/binary"
 	"path"
 	"testing"
 
 	"github.com/nspcc-dev/neo-go/pkg/neotest"
 	"github.com/nspcc-dev/neo-go/pkg/util"
+	"github.com/nspcc-dev/neo-go/pkg/vm"
+	"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
 	"github.com/nspcc-dev/neofs-contract/common"
+	"github.com/nspcc-dev/neofs-contract/subnet"
+	"github.com/stretchr/testify/require"
 )
 
 const subnetPath = "../subnet"
 
 func deploySubnetContract(t *testing.T, e *neotest.Executor) util.Uint160 {
 	c := neotest.CompileFile(t, e.CommitteeHash, subnetPath, path.Join(subnetPath, "config.yml"))
-	args := []interface{}{true}
+	args := []interface{}{false}
 	e.DeployContract(t, c, args)
 	return c.Hash
 }
@@ -28,3 +33,27 @@ func TestSubnet_Version(t *testing.T) {
 	e := newSubnetInvoker(t)
 	e.Invoke(t, common.Version, "version")
 }
+
+func TestSubnet_Put(t *testing.T) {
+	e := newSubnetInvoker(t)
+
+	acc := e.NewAccount(t)
+	pub, ok := vm.ParseSignatureContract(acc.Script())
+	require.True(t, ok)
+
+	id := make([]byte, 4)
+	binary.LittleEndian.PutUint32(id, 123)
+	info := randomBytes(10)
+
+	e.InvokeFail(t, "witness check failed", "put", id, pub, info)
+
+	cAcc := e.WithSigners(acc)
+	cAcc.InvokeFail(t, "alphabet witness check failed", "put", id, pub, info)
+
+	cBoth := e.WithSigners(e.Committee, acc)
+	cBoth.InvokeFail(t, subnet.ErrInvalidSubnetID, "put", []byte{1, 2, 3}, pub, info)
+	cBoth.InvokeFail(t, subnet.ErrInvalidOwner, "put", id, pub[10:], info)
+	cBoth.Invoke(t, stackitem.Null{}, "put", id, pub, info)
+	cAcc.Invoke(t, stackitem.NewBuffer(info), "get", id)
+	cBoth.InvokeFail(t, subnet.ErrAlreadyExists, "put", id, pub, info)
+}