neoneo-go/pkg/rpcclient/native.go
Roman Khimov f155a7f161 rpcclient: move result processing code into unwrap package
Which will be reused by upper-layer packages. It can be extended with more
types in future.
2022-08-09 17:38:47 +03:00

151 lines
5.7 KiB
Go

package rpcclient
// Various non-policy things from native contracts.
import (
"crypto/elliptic"
"errors"
"fmt"
"github.com/google/uuid"
"github.com/nspcc-dev/neo-go/pkg/config"
"github.com/nspcc-dev/neo-go/pkg/core/native/nativenames"
"github.com/nspcc-dev/neo-go/pkg/core/native/noderoles"
"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
"github.com/nspcc-dev/neo-go/pkg/neorpc/result"
"github.com/nspcc-dev/neo-go/pkg/rpcclient/nns"
"github.com/nspcc-dev/neo-go/pkg/rpcclient/unwrap"
"github.com/nspcc-dev/neo-go/pkg/util"
"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
)
// GetOraclePrice invokes `getPrice` method on a native Oracle contract.
func (c *Client) GetOraclePrice() (int64, error) {
oracleHash, err := c.GetNativeContractHash(nativenames.Oracle)
if err != nil {
return 0, fmt.Errorf("failed to get native Oracle hash: %w", err)
}
return c.invokeNativeGetMethod(oracleHash, "getPrice")
}
// GetNNSPrice invokes `getPrice` method on a NeoNameService contract with the specified hash.
func (c *Client) GetNNSPrice(nnsHash util.Uint160) (int64, error) {
return c.invokeNativeGetMethod(nnsHash, "getPrice")
}
// GetGasPerBlock invokes `getGasPerBlock` method on a native NEO contract.
func (c *Client) GetGasPerBlock() (int64, error) {
return c.getFromNEO("getGasPerBlock")
}
// GetCandidateRegisterPrice invokes `getRegisterPrice` method on native NEO contract.
func (c *Client) GetCandidateRegisterPrice() (int64, error) {
return c.getFromNEO("getRegisterPrice")
}
func (c *Client) getFromNEO(meth string) (int64, error) {
neoHash, err := c.GetNativeContractHash(nativenames.Neo)
if err != nil {
return 0, fmt.Errorf("failed to get native NEO hash: %w", err)
}
return c.invokeNativeGetMethod(neoHash, meth)
}
// GetDesignatedByRole invokes `getDesignatedByRole` method on a native RoleManagement contract.
func (c *Client) GetDesignatedByRole(role noderoles.Role, index uint32) (keys.PublicKeys, error) {
rmHash, err := c.GetNativeContractHash(nativenames.Designation)
if err != nil {
return nil, fmt.Errorf("failed to get native RoleManagement hash: %w", err)
}
arr, err := unwrap.Array(c.reader.Call(rmHash, "getDesignatedByRole", int64(role), index))
if err != nil {
return nil, err
}
pks := make(keys.PublicKeys, len(arr))
for i, item := range arr {
val, err := item.TryBytes()
if err != nil {
return nil, fmt.Errorf("invalid array element #%d: %s", i, item.Type())
}
pks[i], err = keys.NewPublicKeyFromBytes(val, elliptic.P256())
if err != nil {
return nil, err
}
}
return pks, nil
}
// NNSResolve invokes `resolve` method on a NameService contract with the specified hash.
func (c *Client) NNSResolve(nnsHash util.Uint160, name string, typ nns.RecordType) (string, error) {
if typ == nns.CNAME {
return "", errors.New("can't resolve CNAME record type")
}
return unwrap.UTF8String(c.reader.Call(nnsHash, "resolve", name, int64(typ)))
}
// NNSIsAvailable invokes `isAvailable` method on a NeoNameService contract with the specified hash.
func (c *Client) NNSIsAvailable(nnsHash util.Uint160, name string) (bool, error) {
return unwrap.Bool(c.reader.Call(nnsHash, "isAvailable", name))
}
// NNSGetAllRecords returns iterator over records for a given name from NNS service.
// First return value is the session ID, the second one is Iterator itself, the
// third one is an error. Use TraverseIterator method to traverse iterator values or
// TerminateSession to terminate opened iterator session. See TraverseIterator and
// TerminateSession documentation for more details.
func (c *Client) NNSGetAllRecords(nnsHash util.Uint160, name string) (uuid.UUID, result.Iterator, error) {
return unwrap.SessionIterator(c.reader.Call(nnsHash, "getAllRecords", name))
}
// NNSUnpackedGetAllRecords returns a set of records for a given name from NNS service
// (config.DefaultMaxIteratorResultItems at max). It differs from NNSGetAllRecords in
// that no iterator session is used to retrieve values from iterator. Instead, unpacking
// VM script is created and invoked via `invokescript` JSON-RPC call.
func (c *Client) NNSUnpackedGetAllRecords(nnsHash util.Uint160, name string) ([]nns.RecordState, error) {
arr, err := unwrap.Array(c.reader.CallAndExpandIterator(nnsHash, "getAllRecords", config.DefaultMaxIteratorResultItems, name))
if err != nil {
return nil, err
}
res := make([]nns.RecordState, len(arr))
for i := range arr {
rs, ok := arr[i].Value().([]stackitem.Item)
if !ok {
return nil, fmt.Errorf("failed to decode RecordState from stackitem #%d: not a struct", i)
}
if len(rs) != 3 {
return nil, fmt.Errorf("failed to decode RecordState from stackitem #%d: wrong number of elements", i)
}
name, err := rs[0].TryBytes()
if err != nil {
return nil, fmt.Errorf("failed to decode RecordState from stackitem #%d: %w", i, err)
}
typ, err := rs[1].TryInteger()
if err != nil {
return nil, fmt.Errorf("failed to decode RecordState from stackitem #%d: %w", i, err)
}
data, err := rs[2].TryBytes()
if err != nil {
return nil, fmt.Errorf("failed to decode RecordState from stackitem #%d: %w", i, err)
}
u64Typ := typ.Uint64()
if !typ.IsUint64() || u64Typ > 255 {
return nil, fmt.Errorf("failed to decode RecordState from stackitem #%d: bad type", i)
}
res[i] = nns.RecordState{
Name: string(name),
Type: nns.RecordType(u64Typ),
Data: string(data),
}
}
return res, nil
}
// GetNotaryServiceFeePerKey returns a reward per notary request key for the designated
// notary nodes. It doesn't cache the result.
func (c *Client) GetNotaryServiceFeePerKey() (int64, error) {
notaryHash, err := c.GetNativeContractHash(nativenames.Notary)
if err != nil {
return 0, fmt.Errorf("failed to get native Notary hash: %w", err)
}
return c.invokeNativeGetMethod(notaryHash, "getNotaryServiceFeePerKey")
}