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invoker: expand the interface with iterator wrappers

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We need them for iterator-based interfaces. Invoker hides the difference
between different (session/expanded) iterators here.
This commit is contained in:
Roman Khimov 2022-08-17 16:38:03 +03:00
parent 689331b960
commit 79051f21c1
3 changed files with 139 additions and 2 deletions
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9
pkg/rpcclient/actor/actor_test.go
View file

@ -4,11 +4,13 @@ import (
"errors"
"testing"
"github.com/google/uuid"
"github.com/nspcc-dev/neo-go/pkg/config/netmode"
"github.com/nspcc-dev/neo-go/pkg/core/transaction"
"github.com/nspcc-dev/neo-go/pkg/neorpc/result"
"github.com/nspcc-dev/neo-go/pkg/smartcontract"
"github.com/nspcc-dev/neo-go/pkg/util"
"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
"github.com/nspcc-dev/neo-go/pkg/wallet"
"github.com/stretchr/testify/require"
)
@ -44,7 +46,12 @@ func (r *RPCClient) GetVersion() (*result.Version, error) {
func (r *RPCClient) SendRawTransaction(tx *transaction.Transaction) (util.Uint256, error) {
return r.hash, r.err
}
func (r *RPCClient) TerminateSession(sessionID uuid.UUID) (bool, error) {
return false, nil // Just a stub, unused by actor.
}
func (r *RPCClient) TraverseIterator(sessionID, iteratorID uuid.UUID, maxItemsCount int) ([]stackitem.Item, error) {
return nil, nil // Just a stub, unused by actor.
}
func testRPCAndAccount(t *testing.T) (*RPCClient, *wallet.Account) {
client := &RPCClient{
version: &result.Version{

73
pkg/rpcclient/invoker/invoker.go
View file

@ -1,17 +1,35 @@
package invoker
import (
"errors"
"fmt"
"github.com/google/uuid"
"github.com/nspcc-dev/neo-go/pkg/core/transaction"
"github.com/nspcc-dev/neo-go/pkg/neorpc/result"
"github.com/nspcc-dev/neo-go/pkg/smartcontract"
"github.com/nspcc-dev/neo-go/pkg/util"
"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
)
// DefaultIteratorResultItems is the default number of results to
// request from the iterator. Typically it's the same as server's
// MaxIteratorResultItems, but different servers can have different
// settings.
const DefaultIteratorResultItems = 100
// RPCSessions is a set of RPC methods needed to retrieve values from the
// session-based iterators.
type RPCSessions interface {
TerminateSession(sessionID uuid.UUID) (bool, error)
TraverseIterator(sessionID, iteratorID uuid.UUID, maxItemsCount int) ([]stackitem.Item, error)
}
// RPCInvoke is a set of RPC methods needed to execute things at the current
// blockchain height.
type RPCInvoke interface {
RPCSessions
InvokeContractVerify(contract util.Uint160, params []smartcontract.Parameter, signers []transaction.Signer, witnesses ...transaction.Witness) (*result.Invoke, error)
InvokeFunction(contract util.Uint160, operation string, params []smartcontract.Parameter, signers []transaction.Signer) (*result.Invoke, error)
InvokeScript(script []byte, signers []transaction.Signer) (*result.Invoke, error)
@ -20,6 +38,8 @@ type RPCInvoke interface {
// RPCInvokeHistoric is a set of RPC methods needed to execute things at some
// fixed point in blockchain's life.
type RPCInvokeHistoric interface {
RPCSessions
InvokeContractVerifyAtBlock(blockHash util.Uint256, contract util.Uint160, params []smartcontract.Parameter, signers []transaction.Signer, witnesses ...transaction.Witness) (*result.Invoke, error)
InvokeContractVerifyAtHeight(height uint32, contract util.Uint160, params []smartcontract.Parameter, signers []transaction.Signer, witnesses ...transaction.Witness) (*result.Invoke, error)
InvokeContractVerifyWithState(stateroot util.Uint256, contract util.Uint160, params []smartcontract.Parameter, signers []transaction.Signer, witnesses ...transaction.Witness) (*result.Invoke, error)
@ -117,6 +137,14 @@ func (h *historicConverter) InvokeContractVerify(contract util.Uint160, params [
panic("uninitialized historicConverter")
}
func (h *historicConverter) TerminateSession(sessionID uuid.UUID) (bool, error) {
return h.client.TerminateSession(sessionID)
}
func (h *historicConverter) TraverseIterator(sessionID, iteratorID uuid.UUID, maxItemsCount int) ([]stackitem.Item, error) {
return h.client.TraverseIterator(sessionID, iteratorID, maxItemsCount)
}
// Call invokes a method of the contract with the given parameters (and
// Invoker-specific list of signers) and returns the result as is.
func (v *Invoker) Call(contract util.Uint160, operation string, params ...interface{}) (*result.Invoke, error) {
@ -157,3 +185,48 @@ func (v *Invoker) Verify(contract util.Uint160, witnesses []transaction.Witness,
func (v *Invoker) Run(script []byte) (*result.Invoke, error) {
return v.client.InvokeScript(script, v.signers)
}
// TerminateSession closes the given session, returning an error if anything
// goes wrong.
func (v *Invoker) TerminateSession(sessionID uuid.UUID) error {
return termSession(v.client, sessionID)
}
func termSession(rpc RPCSessions, sessionID uuid.UUID) error {
r, err := rpc.TerminateSession(sessionID)
if err != nil {
return err
}
if !r {
return errors.New("terminatesession returned false")
}
return nil
}
// TraverseIterator allows to retrieve the next batch of items from the given
// iterator in the given session (previously returned from Call or Run). It works
// both with session-backed iterators and expanded ones (which one you have
// depends on the RPC server). It can change the state of the iterator in the
// process. If num <= 0 then DefaultIteratorResultItems number of elements is
// requested. If result contains no elements, then either Iterator has no
// elements or session was expired and terminated by the server.
func (v *Invoker) TraverseIterator(sessionID uuid.UUID, iterator *result.Iterator, num int) ([]stackitem.Item, error) {
return iterateNext(v.client, sessionID, iterator, num)
}
func iterateNext(rpc RPCSessions, sessionID uuid.UUID, iterator *result.Iterator, num int) ([]stackitem.Item, error) {
if num <= 0 {
num = DefaultIteratorResultItems
}
if iterator.ID != nil {
return rpc.TraverseIterator(sessionID, *iterator.ID, num)
}
if num > len(iterator.Values) {
num = len(iterator.Values)
}
items := iterator.Values[:num]
iterator.Values = iterator.Values[num:]
return items, nil
}

59
pkg/rpcclient/invoker/invoker_test.go
View file

@ -1,17 +1,22 @@
package invoker
import (
"errors"
"testing"
"github.com/google/uuid"
"github.com/nspcc-dev/neo-go/pkg/core/transaction"
"github.com/nspcc-dev/neo-go/pkg/neorpc/result"
"github.com/nspcc-dev/neo-go/pkg/smartcontract"
"github.com/nspcc-dev/neo-go/pkg/util"
"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
"github.com/stretchr/testify/require"
)
type rpcInv struct {
resInv *result.Invoke
resTrm bool
resItm []stackitem.Item
err error
}
@ -51,10 +56,16 @@ func (r *rpcInv) InvokeScriptAtHeight(height uint32, script []byte, signers []tr
func (r *rpcInv) InvokeScriptWithState(stateroot util.Uint256, script []byte, signers []transaction.Signer) (*result.Invoke, error) {
return r.resInv, r.err
}
func (r *rpcInv) TerminateSession(sessionID uuid.UUID) (bool, error) {
return r.resTrm, r.err
}
func (r *rpcInv) TraverseIterator(sessionID, iteratorID uuid.UUID, maxItemsCount int) ([]stackitem.Item, error) {
return r.resItm, r.err
}
func TestInvoker(t *testing.T) {
resExp := &result.Invoke{State: "HALT"}
ri := &rpcInv{resExp, nil}
ri := &rpcInv{resExp, true, nil, nil}
testInv := func(t *testing.T, inv *Invoker) {
res, err := inv.Call(util.Uint160{}, "method")
@ -112,4 +123,50 @@ func TestInvoker(t *testing.T) {
require.Panics(t, func() { _, _ = inv.Verify(util.Uint160{}, nil, "param") })
require.Panics(t, func() { _, _ = inv.Run([]byte{1}) })
})
t.Run("terminate session", func(t *testing.T) {
for _, inv := range []*Invoker{New(ri, nil), NewHistoricAtBlock(util.Uint256{}, ri, nil)} {
ri.err = errors.New("")
require.Error(t, inv.TerminateSession(uuid.UUID{}))
ri.err = nil
ri.resTrm = false
require.Error(t, inv.TerminateSession(uuid.UUID{}))
ri.resTrm = true
require.NoError(t, inv.TerminateSession(uuid.UUID{}))
}
})
t.Run("traverse iterator", func(t *testing.T) {
for _, inv := range []*Invoker{New(ri, nil), NewHistoricAtBlock(util.Uint256{}, ri, nil)} {
res, err := inv.TraverseIterator(uuid.UUID{}, &result.Iterator{
Values: []stackitem.Item{stackitem.Make(42)},
}, 0)
require.NoError(t, err)
require.Equal(t, []stackitem.Item{stackitem.Make(42)}, res)
res, err = inv.TraverseIterator(uuid.UUID{}, &result.Iterator{
Values: []stackitem.Item{stackitem.Make(42)},
}, 1)
require.NoError(t, err)
require.Equal(t, []stackitem.Item{stackitem.Make(42)}, res)
res, err = inv.TraverseIterator(uuid.UUID{}, &result.Iterator{
Values: []stackitem.Item{stackitem.Make(42)},
}, 2)
require.NoError(t, err)
require.Equal(t, []stackitem.Item{stackitem.Make(42)}, res)
ri.err = errors.New("")
_, err = inv.TraverseIterator(uuid.UUID{}, &result.Iterator{
ID: &uuid.UUID{},
}, 2)
require.Error(t, err)
ri.err = nil
ri.resItm = []stackitem.Item{stackitem.Make(42)}
res, err = inv.TraverseIterator(uuid.UUID{}, &result.Iterator{
ID: &uuid.UUID{},
}, 2)
require.NoError(t, err)
require.Equal(t, []stackitem.Item{stackitem.Make(42)}, res)
}
})
}