mirror of
https://github.com/nspcc-dev/neo-go.git
synced 2024-12-25 13:56:35 +00:00
122 lines
3.9 KiB
Go
122 lines
3.9 KiB
Go
/*
|
|
Package nns provide some RPC wrappers for the non-native NNS contract.
|
|
|
|
It's not yet a complete interface because there are different NNS versions
|
|
available, yet it provides the most widely used ones that were available from
|
|
the old RPC client API.
|
|
*/
|
|
package nns
|
|
|
|
import (
|
|
"fmt"
|
|
|
|
"github.com/google/uuid"
|
|
"github.com/nspcc-dev/neo-go/pkg/neorpc/result"
|
|
"github.com/nspcc-dev/neo-go/pkg/rpcclient/nep11"
|
|
"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"
|
|
)
|
|
|
|
// Invoker is used by ContractReader to call various methods.
|
|
type Invoker interface {
|
|
nep11.Invoker
|
|
}
|
|
|
|
// ContractReader provides an interface to call read-only NNS contract methods.
|
|
type ContractReader struct {
|
|
nep11.NonDivisibleReader
|
|
|
|
invoker Invoker
|
|
hash util.Uint160
|
|
}
|
|
|
|
// RecordIterator is used for iterating over GetAllRecords results.
|
|
type RecordIterator struct {
|
|
client Invoker
|
|
session uuid.UUID
|
|
iterator result.Iterator
|
|
}
|
|
|
|
// NewReader creates an instance of ContractReader that can be used to read
|
|
// data from the contract.
|
|
func NewReader(invoker Invoker, hash util.Uint160) *ContractReader {
|
|
return &ContractReader{*nep11.NewNonDivisibleReader(invoker, hash), invoker, hash}
|
|
}
|
|
|
|
// GetPrice returns current domain registration price in GAS.
|
|
func (c *ContractReader) GetPrice() (int64, error) {
|
|
return unwrap.Int64(c.invoker.Call(c.hash, "getPrice"))
|
|
}
|
|
|
|
// IsAvailable checks whether the domain given is available for registration.
|
|
func (c *ContractReader) IsAvailable(name string) (bool, error) {
|
|
return unwrap.Bool(c.invoker.Call(c.hash, "isAvailable", name))
|
|
}
|
|
|
|
// Resolve resolves the given record type for the given domain (with no more
|
|
// than three redirects).
|
|
func (c *ContractReader) Resolve(name string, typ RecordType) (string, error) {
|
|
return unwrap.UTF8String(c.invoker.Call(c.hash, "resolve", name, int64(typ)))
|
|
}
|
|
|
|
// GetAllRecords returns an iterator that allows to retrieve all RecordState
|
|
// items for the given domain name. It depends on the server to provide proper
|
|
// session-based iterator, but can also work with expanded one.
|
|
func (c *ContractReader) GetAllRecords(name string) (*RecordIterator, error) {
|
|
sess, iter, err := unwrap.SessionIterator(c.invoker.Call(c.hash, "getAllRecords", name))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return &RecordIterator{
|
|
client: c.invoker,
|
|
iterator: iter,
|
|
session: sess,
|
|
}, nil
|
|
}
|
|
|
|
// Next returns the next set of elements from the iterator (up to num of them).
|
|
// It can return less than num elements in case iterator doesn't have that many
|
|
// or zero elements if the iterator has no more elements or the session is
|
|
// expired.
|
|
func (r *RecordIterator) Next(num int) ([]RecordState, error) {
|
|
items, err := r.client.TraverseIterator(r.session, &r.iterator, num)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return itemsToRecords(items)
|
|
}
|
|
|
|
// Terminate closes the iterator session used by RecordIterator (if it's
|
|
// session-based).
|
|
func (r *RecordIterator) Terminate() error {
|
|
if r.iterator.ID == nil {
|
|
return nil
|
|
}
|
|
return r.client.TerminateSession(r.session)
|
|
}
|
|
|
|
// GetAllRecordsExpanded is similar to GetAllRecords (uses the same NNS
|
|
// method), but can be useful if the server used doesn't support sessions and
|
|
// doesn't expand iterators. It creates a script that will get num of result
|
|
// items from the iterator right in the VM and return them to you. It's only
|
|
// limited by VM stack and GAS available for RPC invocations.
|
|
func (c *ContractReader) GetAllRecordsExpanded(name string, num int) ([]RecordState, error) {
|
|
arr, err := unwrap.Array(c.invoker.CallAndExpandIterator(c.hash, "getAllRecords", num, name))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return itemsToRecords(arr)
|
|
}
|
|
|
|
func itemsToRecords(arr []stackitem.Item) ([]RecordState, error) {
|
|
res := make([]RecordState, len(arr))
|
|
for i := range arr {
|
|
err := res[i].FromStackItem(arr[i])
|
|
if err != nil {
|
|
return nil, fmt.Errorf("item #%d: %w", i, err)
|
|
}
|
|
}
|
|
return res, nil
|
|
}
|