*: add wokshop file
This commit is contained in:
Anna Shaleva
parent
862c2e4ed3
commit
5ca0d508b6
1 changed files with 407 additions and 0 deletions
407
test.go
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407
test.go
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@ -0,0 +1,407 @@
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package main
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import (
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"context"
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"encoding/base64"
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"encoding/json"
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"fmt"
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"math/big"
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"strings"
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"time"
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"github.com/nspcc-dev/neo-go/internal/random"
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"github.com/nspcc-dev/neo-go/pkg/config"
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"github.com/nspcc-dev/neo-go/pkg/core/block"
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"github.com/nspcc-dev/neo-go/pkg/core/native/nativenames"
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"github.com/nspcc-dev/neo-go/pkg/core/state"
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"github.com/nspcc-dev/neo-go/pkg/core/transaction"
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"github.com/nspcc-dev/neo-go/pkg/neorpc"
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"github.com/nspcc-dev/neo-go/pkg/neorpc/result"
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"github.com/nspcc-dev/neo-go/pkg/rpcclient"
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"github.com/nspcc-dev/neo-go/pkg/rpcclient/actor"
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"github.com/nspcc-dev/neo-go/pkg/rpcclient/gas"
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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/nep17"
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"github.com/nspcc-dev/neo-go/pkg/rpcclient/policy"
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"github.com/nspcc-dev/neo-go/pkg/rpcclient/unwrap"
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"github.com/nspcc-dev/neo-go/pkg/smartcontract"
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"github.com/nspcc-dev/neo-go/pkg/smartcontract/trigger"
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"github.com/nspcc-dev/neo-go/pkg/util"
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"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
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"github.com/nspcc-dev/neo-go/pkg/vm/vmstate"
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"github.com/nspcc-dev/neo-go/pkg/wallet"
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"github.com/pkg/errors"
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)
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const (
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rpcEndpoint = "http://localhost:30333"
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wsEndpoint = "ws://localhost:30333/ws"
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walletPath = "./w.json"
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accPass = ""
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)
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var (
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isNeoGoServer bool
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transferTxH, _ = util.Uint256DecodeStringLE("f359d99a16a93f4c5d838ae9669bc0b6406f783cd71e917c65af6774e9035fd9")
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)
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func main() {
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// Simple RPC client: https://pkg.go.dev/github.com/nspcc-dev/neo-go/pkg/rpcclient
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c, err := rpcclient.New(context.Background(), rpcEndpoint, rpcclient.Options{
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Cert: "",
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Key: "",
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CACert: "",
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DialTimeout: 0,
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RequestTimeout: 0,
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MaxConnsPerHost: 0,
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})
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check(err, "create RPC client")
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defer c.Close()
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err = c.Init()
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check(err, "init RPC client")
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fmt.Printf("Work with simple RPC client:\n\n")
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// Simple RPC methods: https://pkg.go.dev/github.com/nspcc-dev/neo-go/pkg/rpcclient#hdr-Client
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v, err := c.GetVersion()
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check(err, "retrieve version")
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fmt.Printf("RPC node version: %s\n", v.UserAgent)
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isNeoGoServer = strings.Contains(v.UserAgent, config.UserAgentPrefix) // NeoGo node offers several useful extensions.
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p, err := v.Protocol.MarshalJSON()
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check(err, "marshal protocol config")
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fmt.Printf("RPC node protocol config: %s\n", p)
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bCount, err := c.GetBlockCount()
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check(err, "retrieve block height")
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fmt.Printf("Block count: %d\n", bCount)
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currentB, err := c.GetBlockByIndex(bCount - 1) // Be careful with block count/block index conversions.
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check(err, "retrieve currentB block")
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transferTx, err := c.GetRawTransactionVerbose(transferTxH)
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check(err, "retrieve transfer tx")
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fmt.Printf("Transfer tx script: %s\n", base64.StdEncoding.EncodeToString(transferTx.Script))
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transferB, err := c.GetBlockByHash(transferTx.TransactionMetadata.Blockhash)
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check(err, "retrieve transferB block")
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tr := trigger.Application
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applog, err := c.GetApplicationLog(transferTxH, &tr) // Various triggers are supported.
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check(err, "retrieve applog")
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if len(applog.Executions) != 1 {
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panic("unexpected executions number")
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}
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stack, err := json.MarshalIndent(applog.Executions[0].Stack, "", "\t")
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check(err, "marshal stack")
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fmt.Printf("Transfer applog invocation state: %s\nTransfer applog stack: %s\n", applog.Executions[0].VMState, stack)
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// ...
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// Work with wallets: https://pkg.go.dev/github.com/nspcc-dev/neo-go/pkg/wallet
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w, err := wallet.NewWalletFromFile(walletPath)
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check(err, "open wallet")
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acc := w.Accounts[0]
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err = acc.Decrypt(accPass, w.Scrypt)
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check(err, "decrypt account")
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// Some of the extensions offered by NeoGo RPC server: https://github.com/nspcc-dev/neo-go/blob/master/docs/rpc.md#extensions
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if isNeoGoServer {
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// NEP17/NEP11 transfers paging: https://github.com/nspcc-dev/neo-go/blob/master/docs/rpc.md#limits-and-paging-for-getnep11transfers-and-getnep17transfers
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var (
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start = uint64(0)
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stop = currentB.Timestamp
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limit = 10
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page = 0
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)
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nep17T, err := c.GetNEP17Transfers(acc.ScriptHash(), &start, &stop, &limit, &page)
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check(err, "retrieve NEP17 transfers")
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tBytes, err := json.MarshalIndent(nep17T, "", "\t")
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check(err, "marshal NEP17 transfers")
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fmt.Printf("NEP17 transfers of %s:\n%s\n", acc.Address, tBytes)
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// `getblocksysfee` RPC call: https://github.com/nspcc-dev/neo-go/blob/master/docs/rpc.md#getblocksysfee-call
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sysfee, err := c.GetBlockSysFee(nep17T.Received[0].Index)
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check(err, "getblocksysfee")
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fmt.Printf("Block #%d system fee: %d\n", nep17T.Received[0].Index, sysfee)
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// ...
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}
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// Web-socket client and server: https://github.com/nspcc-dev/neo-go/blob/master/docs/rpc.md#websocket-server
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ctx, cancel := context.WithCancel(context.Background())
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wsC, err := rpcclient.NewWS(ctx, wsEndpoint, rpcclient.WSOptions{
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Options: rpcclient.Options{},
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CloseNotificationChannelIfFull: false,
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})
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// Do not use `defer wsC.Close()`, we'll close the client manually later.
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err = wsC.Init()
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check(err, "init WS RPC client")
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fmt.Printf("\nWork with WS RPC client:\n\n")
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// Same simple RPC methods over web-socket:
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gasState, err := wsC.GetContractStateByAddressOrName(nativenames.Gas)
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check(err, "getcontractstate")
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fmt.Printf("GAS contract ID: %d\n", gasState.ID)
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// Unwrap helper package: https://pkg.go.dev/github.com/nspcc-dev/neo-go/pkg/rpcclient/unwrap
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dec, err := unwrap.BigInt(wsC.InvokeFunction(gasState.Hash, "decimals", []smartcontract.Parameter{}, nil))
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check(err, "invokefunction")
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fmt.Printf("GAS contract decimals: %s\n", dec)
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// ...
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// Notifications subsystem: https://github.com/nspcc-dev/neo-go/blob/master/docs/notifications.md
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bCh := make(chan *block.Block, 5) // Add some buffer to prevent WSC from blocking even regular requests.
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ntfCh := make(chan *state.ContainedNotificationEvent, 5)
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aerCh := make(chan *state.AppExecResult, 5)
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dispatcherToMainCh := make(chan struct{})
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go func(ctx context.Context, bCh chan *block.Block, ntfCh chan *state.ContainedNotificationEvent, exCh chan *state.AppExecResult, exitCh chan struct{}) { // TODO: move to a separate function
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dispatcherLoop:
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for {
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select {
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case b := <-bCh:
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fmt.Printf("Block was received:\n\tIndex: %d\n\tPrimary: %d\n\tTransactions: %d\n",
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b.Index, b.PrimaryIndex, len(b.Transactions))
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case ntf := <-ntfCh:
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params, _ := ntf.Item.MarshalJSON()
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fmt.Printf("Notification from execution was received:\n\tContainer: %s\n\tContract: %s\n\tName: %s\n\tParams: %s\n",
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ntf.Container.StringLE(), ntf.ScriptHash.StringLE(), ntf.Name, params)
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case aer := <-aerCh:
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st, _ := json.Marshal(aer.Stack)
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fmt.Printf("Application execution result was received:\n\tContainer: %s\n\tTrigger: %s\n\tVM state: %s\n\tStack:%s\n\tFault exception: %s\n", aer.Container.StringLE(), aer.Trigger, aer.VMState, st, aer.FaultException)
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case <-ctx.Done():
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break dispatcherLoop
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}
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}
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drainLoop:
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for {
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select {
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case <-bCh:
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case <-ntfCh:
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case <-aerCh:
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default:
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break drainLoop
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}
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}
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close(bCh)
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close(ntfCh)
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close(aerCh)
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// Send notification to the main routine.
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close(dispatcherToMainCh)
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}(ctx, bCh, ntfCh, aerCh, dispatcherToMainCh)
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primary := 0
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till := bCount + 5
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fltB := &neorpc.BlockFilter{
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Primary: &primary,
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Since: nil,
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Till: &till,
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}
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bSubID, err := wsC.ReceiveBlocks(fltB, bCh)
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check(err, "subscribe for blocks notifications")
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ctr := gasState.Hash
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name := "Transfer"
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fltNtf := &neorpc.NotificationFilter{
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Contract: &ctr,
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Name: &name,
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}
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ntfSubID, err := wsC.ReceiveExecutionNotifications(fltNtf, ntfCh)
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check(err, "subscribe for execution notifications")
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st := vmstate.Halt.String()
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fltEx := &neorpc.ExecutionFilter{
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State: &st,
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}
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aerSubId, err := wsC.ReceiveExecutions(fltEx, aerCh)
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check(err, "subscribe for AppExecResults")
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// Pretend our app is running and performing some useful work.
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t := time.NewTimer(10 * time.Second)
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var exitErr error
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mainLoop:
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for {
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select {
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case <-t.C:
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break mainLoop
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case <-ctx.Done():
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exitErr = wsC.GetError()
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break mainLoop
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}
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}
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// End of the app work.
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if exitErr != nil {
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fmt.Printf("WS RPC client closing error: %s\n", exitErr)
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} else {
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// We can use wsC.UnsubscribeAll(), but let us show the ID-based unsubscriptions:
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err = wsC.Unsubscribe(bSubID)
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check(err, "unsubscribe from blocks")
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err = wsC.Unsubscribe(ntfSubID)
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check(err, "unsubscribe from execution notifications")
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wsC.Unsubscribe(aerSubId)
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check(err, "unsubscribe from application execution results")
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}
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cancel()
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<-dispatcherToMainCh // Wait for the dispatcher routine to properly finish.
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wsC.Close()
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err = wsC.GetError() // Any error if the closing process wasn't initiated by user via wsC.Close().
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if err != nil {
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fmt.Printf("WS RPC client closing error: %s\n", err)
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}
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// Invoker functionality: https://pkg.go.dev/github.com/nspcc-dev/neo-go/pkg/rpcclient/invoker
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ctx, cancel = context.WithCancel(context.Background())
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wsC, err = rpcclient.NewWS(ctx, wsEndpoint, rpcclient.WSOptions{})
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check(err, "create WS client")
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signers := []transaction.Signer{
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{
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Account: acc.ScriptHash(),
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Scopes: transaction.CalledByEntry,
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},
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}
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inv := invoker.New(wsC, signers)
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// Test invocation of method "transfer" of the GAS contract.
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var (
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from = acc.ScriptHash()
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to = random.Uint160()
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amount = 5
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data = smartcontract.Parameter{Type: smartcontract.AnyType}
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)
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res, err := inv.Call(gasState.Hash, "transfer", from, to, amount, data)
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ok, err := unwrap.Bool(res, err)
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check(err, "perform `transfer` testinvoke")
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fmt.Printf("`transfer` result: %t\n", ok)
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// Historic invocation functionality: https://github.com/nspcc-dev/neo-go/blob/master/docs/rpc.md#invokecontractverifyhistoric-invokefunctionhistoric-and-invokescripthistoric-calls
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invH := invoker.NewHistoricAtHeight(transferB.Index-1, wsC, signers)
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resH, err := invH.Call(gasState.Hash, "transfer", from, to, amount, data)
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ok, err = unwrap.Bool(resH, err)
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check(err, "invoke historic `transfer`")
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fmt.Printf("`transfer` historic result: %t\n", ok)
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// Painful manual events unwrapping...
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var tEvent nep17.TransferEvent
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arr := res.Notifications[0].Item.Value().([]stackitem.Item)
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fromB, _ := arr[0].TryBytes()
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tEvent.From, _ = util.Uint160DecodeBytesBE(fromB)
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toB, _ := arr[1].TryBytes()
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tEvent.To, _ = util.Uint160DecodeBytesBE(toB)
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tEvent.Amount, _ = arr[2].TryInteger()
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// A set of other invoker methods: https://pkg.go.dev/github.com/nspcc-dev/neo-go/pkg/rpcclient/invoker
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// Actor functionality: https://pkg.go.dev/github.com/nspcc-dev/neo-go/pkg/rpcclient/actor
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actSigners := []actor.SignerAccount{
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{
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Signer: signers[0],
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Account: acc, // Provide the decrypted account if possible. It can be signture/multisignature/contract/dummy.
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},
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}
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act, err := actor.New(wsC, actSigners)
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check(err, "create actor")
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aer, err := act.Wait(act.SendCall(gasState.Hash, "transfer", from, to, amount, data))
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check(err, "send `transfer` call via actor")
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if aer.VMState != vmstate.Halt {
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panic("unexpected `transfer` result")
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}
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aer, err = act.Wait(act.SendTunedCall(gasState.Hash, "transfer", []transaction.Attribute{}, func(r *result.Invoke, t *transaction.Transaction) error {
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err := actor.DefaultCheckerModifier(r, t)
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if err != nil {
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return err
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}
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// Perform some additional checks...
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if len(r.Stack) != 1 {
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return fmt.Errorf("unexpected result stack len: %d", len(r.Stack))
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}
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ok, err := r.Stack[0].TryBool()
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if err != nil {
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return fmt.Errorf("unexpected result stack content: %s", r.Stack[0].Type())
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}
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if !ok {
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return errors.New("false `transfer` result")
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}
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// Change the transaction...
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t.NetworkFee = r.GasConsumed + 1
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return nil
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}, from, to, amount, data))
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check(err, "send `transfer` tuned call via actor")
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if aer.VMState != vmstate.Halt {
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panic("unexpected `transfer` tuned result")
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}
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// A set of other Actor methods: https://pkg.go.dev/github.com/nspcc-dev/neo-go/pkg/rpcclient/actor
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// Customizable Actor.
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// NEP17 package: https://pkg.go.dev/github.com/nspcc-dev/neo-go/pkg/rpcclient/nep17
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nep17Act := nep17.New(act, gasState.Hash)
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d, err := nep17Act.Decimals()
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check(err, "retrieve GAS decimals via NEP17 actor")
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fmt.Printf("GAS decimals: %d\n", d)
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aer, err = act.Wait(nep17Act.MultiTransfer([]nep17.TransferParameters{
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{
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From: from,
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To: from,
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Amount: big.NewInt(5),
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Data: nil,
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},
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{
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From: from,
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To: to,
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Amount: big.NewInt(5),
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Data: nil,
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},
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}))
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check(err, "GAS multitransfer")
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applogTr, err := wsC.GetApplicationLog(aer.Container, nil)
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check(err, "retrieve applog for multitransfer")
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transferEvents, err := nep17.TransferEventsFromApplicationLog(applogTr)
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check(err, "retrieve events from multitransfer applog")
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transferEventsBytes, _ := json.MarshalIndent(transferEvents, "", "\t")
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fmt.Printf("GAS multitransfer events:\n%s\n", transferEventsBytes)
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// Native-specific actor packages:
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gasAct := gas.New(act)
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fromBalance, err := gasAct.BalanceOf(from)
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check(err, "retrieve `acc` balance")
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fmt.Printf("`acc` balance: %d\n", fromBalance)
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policyAct := policy.New(act)
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feePerByte, err := policyAct.GetFeePerByte()
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check(err, "retrieve FeePerByte")
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fmt.Printf("FeePerByte value: %d", feePerByte)
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// ...
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// Contract deployment example:
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// TODO: deploy storage contract with iterator inside, put some values, show how iterator sessions work.
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// Iterator sessions:
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// Usage of RPC autogenerated wrappers:
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// TODO: generate wrappers for the same storage contract.
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}
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func check(err error, msg string) {
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if err != nil {
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panic(fmt.Errorf("failed to %s: %w", msg, err))
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}
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}
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