145 lines
4.3 KiB
Go
145 lines
4.3 KiB
Go
package client
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import (
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"errors"
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"fmt"
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"strconv"
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nns "github.com/nspcc-dev/neo-go/examples/nft-nd-nns"
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"github.com/nspcc-dev/neo-go/pkg/rpc/client"
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"github.com/nspcc-dev/neo-go/pkg/smartcontract"
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"github.com/nspcc-dev/neo-go/pkg/util"
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"github.com/nspcc-dev/neo-go/pkg/vm"
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"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
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)
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const (
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nnsContractID = 1 // NNS contract must be deployed first in side chain
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// NNSAuditContractName is a name of the audit contract in NNS.
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NNSAuditContractName = "audit.neofs"
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// NNSBalanceContractName is a name of the balance contract in NNS.
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NNSBalanceContractName = "balance.neofs"
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// NNSContainerContractName is a name of the container contract in NNS.
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NNSContainerContractName = "container.neofs"
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// NNSNeoFSIDContractName is a name of the neofsid contract in NNS.
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NNSNeoFSIDContractName = "neofsid.neofs"
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// NNSNetmapContractName is a name of the netmap contract in NNS.
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NNSNetmapContractName = "netmap.neofs"
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// NNSProxyContractName is a name of the proxy contract in NNS.
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NNSProxyContractName = "proxy.neofs"
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// NNSReputationContractName is a name of the reputation contract in NNS.
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NNSReputationContractName = "reputation.neofs"
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// NNSSubnetworkContractName is a name of the subnet contract in NNS.
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NNSSubnetworkContractName = "subnet.neofs"
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)
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var (
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// ErrNNSRecordNotFound means that there is no such record in NNS contract.
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ErrNNSRecordNotFound = errors.New("record has not been found in NNS contract")
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errEmptyResultStack = errors.New("returned result stack is empty")
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)
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// NNSAlphabetContractName returns contract name of the alphabet contract in NNS
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// based on alphabet index.
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func NNSAlphabetContractName(index int) string {
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return "alphabet" + strconv.Itoa(index) + ".neofs"
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}
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// NNSContractAddress returns contract address script hash based on its name
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// in NNS contract.
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// If script hash has not been found, returns ErrNNSRecordNotFound.
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func (c *Client) NNSContractAddress(name string) (sh util.Uint160, err error) {
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if c.multiClient != nil {
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return sh, c.multiClient.iterateClients(func(c *Client) error {
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sh, err = c.NNSContractAddress(name)
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return err
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})
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}
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cs, err := c.client.GetContractStateByID(nnsContractID) // cache it?
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if err != nil {
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return sh, fmt.Errorf("NNS contract state: %w", err)
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}
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sh, err = nnsResolve(c.client, cs.Hash, name)
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if err != nil {
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return sh, fmt.Errorf("NNS.resolve: %w", err)
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}
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return sh, nil
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}
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func nnsResolve(c *client.Client, nnsHash util.Uint160, domain string) (util.Uint160, error) {
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found, err := exists(c, nnsHash, domain)
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if err != nil {
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return util.Uint160{}, fmt.Errorf("could not check presence in NNS contract for %s: %w", domain, err)
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}
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if !found {
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return util.Uint160{}, ErrNNSRecordNotFound
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}
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result, err := c.InvokeFunction(nnsHash, "resolve", []smartcontract.Parameter{
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{
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Type: smartcontract.StringType,
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Value: domain,
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},
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{
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Type: smartcontract.IntegerType,
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Value: int64(nns.TXT),
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},
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}, nil)
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if err != nil {
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return util.Uint160{}, err
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}
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if result.State != vm.HaltState.String() {
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return util.Uint160{}, fmt.Errorf("invocation failed: %s", result.FaultException)
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}
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if len(result.Stack) == 0 {
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return util.Uint160{}, errEmptyResultStack
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}
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// Parse the result of resolving NNS record.
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// It works with multiple formats (corresponding to multiple NNS versions).
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// If array of hashes is provided, it returns only the first one.
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res := result.Stack[0]
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if arr, ok := res.Value().([]stackitem.Item); ok {
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if len(arr) == 0 {
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return util.Uint160{}, errors.New("NNS record is missing")
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}
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res = arr[0]
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}
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bs, err := res.TryBytes()
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if err != nil {
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return util.Uint160{}, fmt.Errorf("malformed response: %w", err)
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}
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return util.Uint160DecodeStringLE(string(bs))
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}
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func exists(c *client.Client, nnsHash util.Uint160, domain string) (bool, error) {
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result, err := c.InvokeFunction(nnsHash, "isAvailable", []smartcontract.Parameter{
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{
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Type: smartcontract.StringType,
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Value: domain,
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},
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}, nil)
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if err != nil {
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return false, err
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}
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if len(result.Stack) == 0 {
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return false, errEmptyResultStack
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}
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res := result.Stack[0]
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available, err := res.TryBool()
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if err != nil {
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return false, fmt.Errorf("malformed response: %w", err)
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}
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// not available means that it is taken
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// and, therefore, exists
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return !available, nil
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}
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