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101 lines
3.6 KiB
Go
101 lines
3.6 KiB
Go
package invoker_test
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import (
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"context"
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"errors"
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"github.com/nspcc-dev/neo-go/pkg/core/transaction"
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"github.com/nspcc-dev/neo-go/pkg/encoding/address"
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"github.com/nspcc-dev/neo-go/pkg/rpcclient"
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"github.com/nspcc-dev/neo-go/pkg/rpcclient/invoker"
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"github.com/nspcc-dev/neo-go/pkg/rpcclient/neo"
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"github.com/nspcc-dev/neo-go/pkg/rpcclient/unwrap"
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"github.com/nspcc-dev/neo-go/pkg/util"
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"github.com/nspcc-dev/neo-go/pkg/vm/vmstate"
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)
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func ExampleInvoker() {
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// No error checking done at all, intentionally.
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c, _ := rpcclient.New(context.Background(), "url", rpcclient.Options{})
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// A simple invoker with no signers, perfectly fine for reads from safe methods.
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inv := invoker.New(c, nil)
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// Get the NEO token supply (notice that unwrap is used to get the result).
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supply, _ := unwrap.BigInt(inv.Call(neo.Hash, "totalSupply"))
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_ = supply
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acc, _ := address.StringToUint160("NVTiAjNgagDkTr5HTzDmQP9kPwPHN5BgVq")
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// Get the NEO balance for account NVTiAjNgagDkTr5HTzDmQP9kPwPHN5BgVq.
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balance, _ := unwrap.BigInt(inv.Call(neo.Hash, "balanceOf", acc))
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_ = balance
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// Test-invoke transfer call.
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res, _ := inv.Call(neo.Hash, "transfer", acc, util.Uint160{1, 2, 3}, 1, nil)
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if res.State == vmstate.Halt.String() {
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panic("NEO is broken!") // inv has no signers and transfer requires a witness to be performed.
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} else {
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println("ok") // this actually should fail
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}
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// A historic invoker with no signers at block 1000000.
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inv = invoker.NewHistoricAtHeight(1000000, c, nil)
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// It's the same call as above, but the data is for a state at block 1000000.
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balance, _ = unwrap.BigInt(inv.Call(neo.Hash, "balanceOf", acc))
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_ = balance
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// This invoker has a signer for NVTiAjNgagDkTr5HTzDmQP9kPwPHN5BgVq account with
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// CalledByEntry scope, which is sufficient for most operation. It uses current
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// state which is exactly what you need if you want to then create a transaction
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// with the same action.
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inv = invoker.New(c, []transaction.Signer{{Account: acc, Scopes: transaction.CalledByEntry}})
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// Now test invocation should be fine (if NVTiAjNgagDkTr5HTzDmQP9kPwPHN5BgVq has 1 NEO of course).
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res, _ = inv.Call(neo.Hash, "transfer", acc, util.Uint160{1, 2, 3}, 1, nil)
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if res.State == vmstate.Halt.String() {
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// transfer actually returns a value, so check it too.
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ok, _ := unwrap.Bool(res, nil)
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if ok {
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// OK, as expected.
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// res.Script contains the corresponding script.
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_ = res.Script
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// res.GasConsumed has an appropriate system fee required for a transaction.
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_ = res.GasConsumed
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}
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}
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// Now let's try working with iterators.
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nep11Contract := util.Uint160{1, 2, 3}
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var tokens [][]byte
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// Try doing it the right way, by traversing the iterator.
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sess, iter, err := unwrap.SessionIterator(inv.Call(nep11Contract, "tokensOf", acc))
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// The server doesn't support sessions and doesn't perform iterator expansion,
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// iterators can't be used.
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if err != nil {
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if errors.Is(err, unwrap.ErrNoSessionID) {
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// But if we expect some low number of elements, CallAndExpandIterator
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// can help us in this case. If the account has more than 10 elements,
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// some of them will be missing from the response.
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tokens, _ = unwrap.ArrayOfBytes(inv.CallAndExpandIterator(nep11Contract, "tokensOf", 10, acc))
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} else {
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panic("some error")
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}
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} else {
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items, err := inv.TraverseIterator(sess, &iter, 100)
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// Keep going until there are no more elements
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for err == nil && len(items) != 0 {
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for _, itm := range items {
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tokenID, _ := itm.TryBytes()
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tokens = append(tokens, tokenID)
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}
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items, err = inv.TraverseIterator(sess, &iter, 100)
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}
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// Let the server release the session.
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_ = inv.TerminateSession(sess)
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}
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_ = tokens
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}
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